Late-May News and Updates

Hello Grotonweather Fans! I have been working very hard over the past couple of months on new and exciting things. I thought I would type up a blog to explain and promote some of these things.

First off is Finger Lakes Weather (www.fl-weather.com), my new weather forecasting and consulting business. It is my hope that Finger Lakes Weather will become my career, helping local businesses, organizations, and the public with private and customizable weather forecasts. Finger Lakes Weather offers a variety of "Forecast Packages" tailored specifically towards various groups. For the spring, I offered a frost forecast package and was able to do some free-trial forecasting for Fox Run Vineyards and Three Brothers Vineyards, both on Seneca Lake. I have plans for a forecast package for construction workers. Right now, I am offering a special on vacation forecasting...but more on that later. Check out Finger Lakes Weather (the website again is www.fl-weather.com) and join the Finger Lakes Facebook page.

Next up is the Grotonweather Radar Page (www.grotonweather.com/radar). I recently got some top-notch radar software that is used by many meteorologists, especially storm chasers and others interested in thunderstorms. This software allows me to upload the radar to the website, so that is what I have done. Furthermore, I can display things such as areas of possible hail, rotation in thunderstorms, winds, and watches and warnings. I can also zoom right in on a storm down to street-level. So far, this has been a HUGE success with hundred of views despite an overall quiet thunderstorm season thusfar.

A severe thunderstorm approaches Ithaca.

Success does not come without price, however. And in this case, the price is measured in bandwidth. For those not familiar, bandwidth is basically the amount of data transferred to and from a website. The radar page uploads large image files every few minutes and quickly ate up my monthly bandwidth limit. That in turn forced me to purchase a more expensive hosting plan. My costs for running Grotonweather.com, not including time spent, is now approaching $200 a year.

Since 2006, when I started this operation, I have not received any revenue from my website. I am dedicated to keeping the website free. As costs continue to rise, something has to be done to offset some of these costs. Rather than charge money for Grotonweather and rather than flat out asking for donations, I decided a fund-raiser would be the best idea.

This is where the vacation forecasting package from Finger Lakes Weather (www.fl-weather.com/vacation) comes back into play. As a fund-raiser, I am offering this service at a reduced price of just $10 per day or $50 per week. What does that entail? I will forecast for your travels to and from your vacation destination. I will forecast for you each morning of your trip so that you can know what to expect. If you have plans to engage in a certain activity- whether a day at the beach, a horseback ride, a bicycle tour...anything at all- I will forecast specifically for that activity and how the weather might impact your plans.

Furthermore, I will do severe weather forecasting for you. Say you are driving down the highway in Kansas and you see storms ahead. You can give me a call- no matter what time of day or night- and ask me if they are severe. Or, if you are enjoying your vacation (which you should be!), but storms (or a hurricane!) are coming, I will reach out to you and let you know.

I think this is a really neat and unique service and I believe it will help you make the most of your vacation. And it would really help relieve some of the costs I have. So please, consider signing up before June 10th to get the sale price. Even if your vacation is in August or later, book it now. Here is the link again: www.fl-weather.com/vacation

Moving on now, I am slowly working on a redesign of Grotonweather.com. I am really excited about how it looks so far. I did a survey a couple of weeks ago on displaying confidence and uncertainty in forecasts. The results were a tremendous help, so thank you to all who participated! I am now doing a smaller follow-up survey on a proposed forecast layout change. Please, if you could take a moment and fill it out, I would be very grateful. Here is the link: www.grotonweather.com/survey

If that was all not enough, I also started a new project on Facebook in an attempt to 1) combine my strong religious beliefs with my love for the weather 2) help those threatened by severe weather on a national level and 3) expand my forecasting beyond just the Finger Lakes. The result is the Storming Heaven Facebook group. If you believe in the power of prayer, go ahead an join up.

Back in late March, the Groton Public Library invited me to give an hour-long presentation. I presented on the Blizzard of 1993. Thank you to the library for the opportunity to speak! If you would like me to speak at your event or in your class (I've spoken at 3 schools since November), just send me an email or let me know on Facebook!

Thank you for reading this long post and for your continued support and interest in Grotonweather.com and the other projects I am working on. Stay tuned for more great features coming up...I am only getting started!!!

No Alert Mode this time...

A potentially significant severe weather outbreak across much of the northeast, including our area is beginning. However, Grotonweather.com will NOT be going into alert mode for this event. As I mentioned in the Alert Mode blog, I take the issuing of Alert Mode very seriously. I only issue them when it seems like widespread, life threatening weather is likely.

Today's event is very close to that criteria, and I cannot say for sure that I will not issue Alert Mode status later in the day. At this point though, I do not think the storms will organize quite fast enough to bring the high risks necessary for an Alert Mode. If this site was for Chenango, Monroe and Otsego counties, I very likely would be going into Alert Mode. The worst of this event, in terms of spatial coverage and intensity, will likely be just to our east.

That being said, storms are already starting to develop in our area and just to the west. These storms will not take long to become severe, and our threats for wind damage and hail remain at a 'MODERATE' level. Winds up to 80mph and two inch hail are not totally out of the question. Stay tuned for updates!

Are we done YET?

6:45 PM Update: A severe thunderstorm warning is in effect for the very southern most portions of Tompkins and Cortland counties, but the storm is pretty much south of the county lines. Looking upstream, the more impressive thunderstorms should pass well to our west and east as the cold front begins to press through. As a result, I think we are pretty much done with severe weather here in the Grotonweather forecast area. There will likely be a shower or two...maybe even a light thunderstorm...over the next few hours...but the biggest hazard from here on out through tomorrow morning should be some areas of dense fog.

5PM Update: The storms over Ontario County have struggled to organize and are falling apart into just showers.

UPDATE 4:30PM: As I suspected (but a bit quicker I must admit), a healthy looking cell has broken off the lake breeze and is holding itself together nicely over Ontario County with some new development along its southern flank. If it keeps holding together, it should reach Cayuga Lake about 5:15-5:30 before heading into the Grotonweather forecast area between 5:30 and 7pm.

Original 4PM post: The Grotonweather forecast area has been hit hard twice today, with only the northern portions of Cortland County missing out on the active weather (but not by much, as southern Onondaga County has been hammered too!) Numerous severe weather reports have come out of the area, the most notable being trees and powerlines down in Lansing early this afternoon and a recorded wind gust of 55mph in Locke, 1.25" hail in Dryden and 1" hail in Cortland with the second round of storms.

So...are we done yet? For a little while at least. What has been happening is lake breeze fronts from Lake Erie and Ontario have been triggering storms between Rochester and Buffalo. These storms have been sitting and redeveloping over the same area for hours. As the individual cells move away from the lake breeze, they have been tracking southeast across the Finger Lakes, right into our neck of the woods. the last big storm that went through our area stabilized the atmosphere a good deal, and so as the cells break off of the lake breeze, they have started to quickly die out. I tend to doubt this will remain the case though. The sun is out and already working to destabilize the area once again. Eventually, I believe that another storm will have enough fuel to head down towards us once again, probably in the 1-3 hour time frame. After that, the lake breeze will start to die out. However, the cold front still has to come through and encounter a still unstable airmass across Western New York. more storms may fire up along that as it moves east...especially if it does so while the lake breeze is still adding extra lift to the atmosphere.

Bottom line: we may not be done yet...so stay tuned!

1PM Severe Weather Update

2PM Update: SEVERE THUNDERSTORM WARNING FOR S. CAYUGA COUNTY UNTIL 2:45 pm. A severe storm over Ontario county will move into S. Cayuga county over the next 30-60 minutes. I expect the warning to be extended/overlapped as the storm moves into the area. If the storm remains severe (and there is not really any reason for it not to), Groton, Homer and Cortland will have to watch out for this storm between 3-4 pm. Interesting note: All of the Grotonweather forecast area but extreme northeast Tompkins and northern Cortland Counties have been under severe thunderstorm warnings at some point today already! And our watch goes for 6 more hours.

Original 1PM post: Lots going on this afternoon already. A severe storm tore through central Tompkins county last hour. It is looking a bit less organized as it moves into S. Cortland county. I was in Ithaca, on the 11th floor of Bradfield Hall, Cornell as the storm passed. There was rotation with it, and I got some awesome pictures I will post tonight. The storm produced 1" hail in Trumansburg and took out "many" trees and powerlines in Lansing. No other reports yet (as of 1PM).

While all this was going on, the SPC moved us into a moderate risk. This is primarily for the threat of damaging winds. Now, we've already experienced severe weather...but is more on the way? Our watch goes until 8pm, afterall. The answer is yes, our threat still continues. There are more showers and storms forming over western New York back into Canada. The cold front itself stretches from Ontario back into Ohio and Indiana. The air just upstream is very unstable, and the storms we've already had shouldn't have much of an effect on our instability for the middle or latter part of the afternoon.

If you haven't become a fan of Grotonweather on facebook or a follower on Twitter, you will want to do so now! I've been posting up a storm (pun intended) on those two sites all morning with the latest updates and will continue to do so through the day. Also, the Grotonweather Toolbar is a great way to keep your eye on the latest forecast. Download it here. And, as always, the main site/blog will be updated throughout the day to keep you safe!

That's all for now. Keep checking back!

Video: Severe threat update

Risks Upgraded

There have been a couple of changes in the forecast this morning as things area already rapidly evolving. Probably the most significant of these changes is that, instead of all the clouds and rain the models had been forecasting for us this morning, skies are clear. This is causing the atmosphere to destabilize quicker and more intensely than had been forecasted. Another thing to look at is the radar. Thunderstorms are widespread just west of Buffalo, and already, there are some storms popping out ahead of this main area...so the question of whether or not storms will form is out the window.

The Storm Prediction Center has us in a 30-30-5% risk for wind-hail-tornadoes, respectively. All three of those are on the upper end of their 'slight' risk category. After looking at a couple things, I moved my hail and win up to moderate, and kept tornadoes at slight. Since storms are already firing, I moved the thunderstorm risk all the way up, which the NWS in Binghamton also did on their threat outlooks.

Here is what I am expecting for each threat:

Thunderstorms: Extreme-
Widespread thunderstorms can be expected with almost everywhere getting a storm. Frequent lightning should accompany the storms, and a fair number of them will likely be severe.

Wind: Moderate-
With the sun out this morning and strong upper level winds, wind damage is likely somewhere in Central New York, with some possibility of widespread damaging winds. 3 to 7 damaging wind reports are possible in the Grotonweather forecast area (Tompkins, S. Cayuga and Cortland Counties), with more elsewhere in Central New York. Should a widespread wind event evolve, this will be increased to high.

Hail: Moderate-
With extra instablity from the sun this morning, and indications of favorable hail formation from both the models, and current observations, hail could become a major factor today. 3 to 7 severe (0.75" of bigger) hail reports in the forecast area is possible, with more elsewhere in Central New York. Hail sizes should stay below 1.5", but an isolated storm could produce up to 2" hail. An upgrade to a high risk is not expected at this time.

Tornadoes: Slight-
Little changes to the tornado forecast have been made. A tornado somewhere in Western and Central New York seems almost likely. Multiple tornadoes could be possible, but this certainty isn't enough for a moderate risk at the time. However, with strong southeast winds at the surface, winds at low levels out of the southwest, and upper level winds coming in from the west, the threat for tornadoes will need to be watched closely.

Friday Afternoon's Severe Weather Outlook for 7/11

I spent the morning and early afternoon down at the National Weather Service in Binghamton, where I am an intern this summer, and used some of their in-house tools to try to get a better handle on the severe weather threat tomorrow. I will mention that the meteorologists there this morning believe tomorrow will be an active day and seem to have a high confidence level.

One of the tools I used this morning was a form called the 'severe weather checklist'. This form has you enter in forecasted values for a variety of severe weather parameters. After doing so, it returns the 5 most similar severe weather days in recent Central New York history. When completing this checklist this morning, it returned 4 days of 'isolated supercells', including May 16th, 2009, which had 3 tornadoes in the area, and May 31, 2002, which had 4 tornadoes. The fifth day was classified as a 'broken line'. Hail was the primary threat from the five days collectively. That tells me that not everywhere tomorrow will see a strong thunderstorm....some areas may barely even get any rain. However, there is certainly potential for some severe weather, and someone will likely have to deal with a damaging storm.

Here is a glance at where I have my threat levels, and an in depth look at exactly what I mean by each threat level, as well as what would need to happen for an upgraded risk:

Thunderstorms: moderate-
Thunderstorms are likely across much of the area. A few places, however, will be missed and get little to no rain. Frequent lightning will accompany some of the storms.

High Winds: slight-
Some storms may contain strong winds. Wind damage will be isolated to scattered, with 3 to 10 reports in Central New York. Sunshine in the morning would increase the chances of wind damage, and could get this bumped up to a moderate risk.

Hail: slight-
Small hail will be possible with stronger storms tomorrow, but most hail should remain uner 1" in diameter. The strongest storms may produce up to 1.5" hail. 5-12 Severe hail (over 0.75") events can be expected in Central New York. This is still rather uncertain, and could be upgraded to a moderate risk should the models show a bit better conditions for hail tomorrow morning.

Tornadoes: slight-
Conditions are favorable for rotating storms, and tornadoes could form. My best current guess is that somewhere in Western, Central and Southern New York will see a weak tornado, but as many as 2 or 3 wouldn't surprise me. This would most likely not be upgraded to moderate unless numerous storms that have already developed are showing signs of becoming tornadic.

Expect the next website update to occur between 9 and 11 am tomorrow. A blog update should occur within 30 minutes of that. There also could be a quick blog update tonight. During the afternoon tomorrow, I plan to have the weather chat open and will be updating th blog and website as needed. Stay tuned!

Severe Storm Potential

I am very impressed with the atmosphere this morning and feel like this is perhaps the best severe weather set up we have had so far this spring. There is a cold front draped across eastern Ohio this morning that will move eastward and trigger thunderstorms. Ahead of that front, skies have cleared across western New York, creating an already unstable atmosphere even more so. I was surprised to see the instability indexes so high already this morning. You did not need me to tell you that, however, as the humidity this morning is making it feel very uncomfortable and muggy.

The main threat today is going to be large hail and damaging wind gusts. However, conditions also appear favorable for a tornado or two to form, so you will want to keep an eye to the sky. The Storm Prediction Center does not actually have us in a slight risk area today, for reasons that are beyond my understanding. I feel that the will reverse their thinking as the morning wears on and, with their 12:30pm update, add us to the slight risk area. You can check that by clicking here.

I will not be able to update this during the afternoon today. I will actually be down at the National Weather Service in Binghamton on my first day as a summer intern there. I do not think there could have been a better day for me to start, and I believe it will be a very active day down there. Click Here for the latest watches and warning, and click here for a look at the radar.

A Look at Watch #280

The Storm Prediction Center has issued a Severe Thunderstorm Watch that stretches across almost all of New York State. It remains in effect until 7pm tonight. Here is a look at the exact counties it includes. As you can see, Tompkins, Cortland and S. Cayuga are right in the middle of it.


The main threat from this event is going to be damaging winds. Hail will also be possible, and my gut feeling is there will be a tornado somewhere in the watch box. The official probabilities that the SPC has put with the watch:
Tornadoes

Probability of 2 or more tornadoes	Low (20%)
Probability of 1 or more strong (F2-F5) tornadoes	Low (5%)

Wind

Probability of 10 or more severe wind events	Mod (60%)
Probability of 1 or more wind events > 65 knots	Mod (30%)

Hail

Probability of 10 or more severe hail events	Mod (30%)
Probability of 1 or more hailstones > 2 inches	Low (20%)

Combined Severe Hail/Wind

Probability of 6 or more combined severe hail/wind events

High (80%)

Since it is at the top of the hour, the current observations and indicies will not be in for another 20-40 minutes. Looking at the data from noon, though, it is obvious to me that the atmosphere is quickly destabilizing. Also, a pocket of strong winds in the upper atmosphere is beginning to move into Western New York, and will spread over the rest of the state, enhancing the thunderstorms. Storms are going to develop from west to east, and have already begun to fire up across Western New York, Lake Erie and Lake Ontario. These storms should organize into a squall line eventually, which is when the greatest threat for wind damage will be. The highest tornado and hail threat will be just prior to that, when the storms are more individual cells.

Be sure to keep checking back through the afternoon for the latest!

Abnormal September Tornado Threat

I can't say I saw this one coming, but I get up this morning and almost everything I look at points to today being a rough day across parts of Central New York. Last year in meteorology class, we went over tornado forecasting in quite some detail. A lot of the things we were told to look for have started to line up. The one thing that will probably prevent this from being an outbreak is the fact that the air aloft isn't all that cold. That warm air aloft should help keep the instability less than it would be on other days that are this humid. Regardless to say, the Storm Prediction Center has us in their '5%' chance of tornadoes.

There are meteorologists, however, who do not like the SPC's % system. One of them is Accuweather Senior Meteorologist Henry Margusity, who I have mentioned many times. Over the summer, he developed a scale to better address the threats of severe thunderstorms. His scale goes from 1-4 and outlines specific threats for each category. You will likely have to click the image to read it, but here is a look at his system:


Henry has placed us in his T3 Category today mainly for the tornado threat. It will be interesting to see how this one unfolds. Stay tuned!

Split Forecast Area

The grotonweather.com forecast area has been split by Severe Thunderstorm Watch 638. Cayuga County is under the watch, while Tompkins and Cortland got left out. In all honesty, however, that is just a technicality. Conditions are just as favorable for severe thunderstorms in Tompkins and Cortland Counties as they are in Cayuga...the SPC has to draw the line somewhere, however. I am expecting another watch to be issued later this afternoon that will include the rest of the area.




Numerous thunderstorms have developed over Western New York and Western Pennsylvania. These storms will track east, with damaging winds and hail the main threats. Other storms will develop as well, so it looks like we may have a decent severe weather event on our hands.

Severe t-storm approaching!

The National Weather Service in Binghamton has issued a Severe Thunderstorm WARNING for Northern Tompkins County and surrounding areas. This includes Groton. A large thunderstorm, likely containing hail, is currently just west of Cayuga Lake, moving east. Expect torrential downpours, hail and frequent lightning with this storm!

Severe Thunderstorm Watch

Thunderstorms have begun to develop all across the Northeast and Ohio Valley, including Central and Western New York. This has prompted the Storm Prediction Center to issue a Severe Thunderstorm Watch for all of the counties shaded in blue below, including Tompkins County pretty much smack dab in the middle of the watch:



The probabilities with this watch indicate that the SPC is most concerned with hail, followed closely by damaging winds. The chances of 10 or more hail reports in the watch area is 70%, with a 50% chance of 10 or more hail reports.

Looking at the regional radar, you can see lots of thunderstorms scattered about the area. These will continue to develop, increasing in strength and coverage.
Stay tuned for any warnings!

Here we go!

The 12:30PM Update of the SPC Outlooks has the moderate risk area bumped to the northwest. This shift puts the border of the moderate risk area right overhead. Our hail remains at 30% with hatching, which, if you didn't read today's first blog, indicates a 10+% chance of 2" hail or larger.



An hour ago, the radar was quiet. Now, thunderstorms have fired all across the state. Already a few of these have Severe Thunderstorm Warnings with them. As the afternoon progresses, more storms will develop and become severe.

Stay tuned for updates if any severe storms approach!

Watch Issued

Severe Thunderstorm Watch #550 has been issued. This is quite a massive watch, encompasing most of New York and about 70% of Pennsylvania. With a watch that large, probablities aren't overly helpful for local forecasts. Nonetheless, there is an 80% chance of 10+ wind damage reports and a 70% chance of 10+ hail reports within the watch area. The watch runs until 7PM.


There really hasn't been anything developing yet, thought there is one shower in Western New York that has popped up, so I am expecting more storms to fire during the next couple of hours. The next SPC outlook will be out by 12:30. It will be interesting to see if they change anything.

Its going to be close

The severe weather threat is already ending up higher than I anticipated last night. For the second time in a week, the Storm Prediction Center has issued a Moderate Risk area for portions of the Northeast. At this time, we are just to the northwest of this area, with the boundary running from southwest to northeast through about Binghamton. Here are the hail (top) and wind (bottom) outlooks for today from the SPC. The hail one in particular has me concerned, since we are on the edge of the hatched area, which means a 10% or greater chance of hail over 2" in diameter.


8AM Edit: The visible image shows clearing skies behind this morning's area of rain. Since this satellite image was taken before the sun got very high in the sky, the dark area over Western New York is where the sun will be out. That was the key that was going to make or break us: sun. Yesterday, I wasn't calling for much if any sun. But now, things have changed.


I will continue to monitor this situation as it develops. Stay tuned for the latest! The next outlook from the SPC will come around 9:30, so check back closer to 10 for an update.

10AM Update: The newest SPC outlooks remain the same for our area. That keeps us right on the edge of the 30% wind and 30% hail lines, along with the edge of the hatched hail area.

A New Weather Watch

The Storm Prediction Center just issued a Severe Thunderstorm Watch for Central New York and points south until 10 PM. This watch replaces the tornado watch that has been in effect. This doesn't mean the tornado threat is totally gone, however. A lot of the severe weather composite index values that are used to predict severe weather show a semi-tornadic environment overhead. However, wind damage and hail will continue to be the main threats for the rest of the day.



Onto the radar now. As you can see, thunderstorms have again developed to our west into a bit of a broken line. Like this morning, these aren't severe. However, I expect these to strengthen as they head into the more favorable atmosphere sitting over us.




Stay tuned throughout the afternoon and evening as round 2 begins!

Not Done Yet

One round of severe storms has exited the region and pressed eastward. This line didn't look like it was going to do much for Tompkins, Cortland and Southern Cayuga counties, but right as it got here, it exploded rapidly. Just shows what a little bit extra heating and humidity can do for storms, as tempertures before the storms had reached into the mid 80's. These storms have caused quite a few hail and wind reports, as expected. Here is the storm report map as of 1:02PM.


Tempertures are back into the low 80's after about a 15 degree drop with those storms. That means we are certainly still have fuel to work with for the rest of the day. Thunderstorms are also now starting to develop well to our west along the cold front in Ohio. They haven't been going for long, but are already looking strong and developing into a line. This is what I have expected to happen, so everything still looks favorable for another, possibly more intense, line of storms later this evening.


In between then and now, additional storms are possible, also with damaging winds and hail. I'll continue to update through the day, so stay tuned!

TORNADO WATCH ISSUED

Tompkins County, along with all of Central and Eastern New York is now under a TORNADO WATCH until 6PM tonight!


A little known fact about watches is that they each have probablities of certain severe weather events occuring. For this watch, there is over a 95% chance of 10 or more wind damage reports, as well as over a 95% chance of 10 or more hail reports and a 40% chance of 2 or more tornado reports. That means the main threat is still damaging winds, but tornadoes are becoming an increasing threat.

An update on that line of storms: The northern portion appears to be the stronger part, with numerous warnings now in effect. Stay tuned for more updates on these storms.



Also, the National Weather Service confirmed my belief about multiple lines of storms today when they issued this statement at 10:05AM:

... Severe thunderstorms are expected across the region today...

An initial line of thunderstorms will cross The Finger lakes
region... the twin tiers... the Mohawk Valley... and the southern Tug
Hill region this morning... generally between 930 am and 12 noon.
This includes Elmira... Corning... Syracuse... Utica... Binghamton...
and Montrose. Localized strong damaging winds and hail are
possible late this morning.

This afternoon... another round of thunderstorms is anticipated.
Additional lines of storms are expected to cross the area... generally
between 2 and 6 PM. Once again... strong winds and hail are the
primary threats.

Stay tuned to NOAA Weather Radio... or local media outlets... for the
latest updates. Watches and/or warnings may well be issued later
today.

Round Two Begins!

The clusters of thunderstorms that moved through earlier today have shifted well off to the south and east. While these storms stabilized the atmosphere for a while, in the long run, they only made things worse. Over an inch of rain fell in Groton earlier. Now, with the sun back out, that inch of rain is returning to the atmosphere. Dewpoints have shot up into the mid to upper 70's, making it feel over 90 despite temperatures being in the low to mid 80's. All this moisture is fueling another round of thunderstorms which is just now starting to explode.

Right now, most of these storms are in the southern counties of New York, but there is a large cell over Lake Ontario as well. Further rapid development of storms is certainly possible over the next few hours. There is currently (4:30) a small cell near Trumansburg that will have to be watched for rapid development in the next hour or so. A severe thunderstorm watch remains in effect as well.

Looking into this evening and overnight, there is a very strong line of severe thunderstorms over Michigan right now. These storms have a severe thunderstorm watch for Michigan, and a torando watch issued by the Canadian Weather Service for Southern Ontario. It is hard to say if this line will hold together long enough to effect us, but it is something I will be watching through the evening.

On this radar image (from weathertap.com) you can see the numerous cells firing up in New York, along with the line of storms in Michigan marching eastward.