First snow of the season!

The past 24 hours have been crazy on the weather models. Yesterday, all but one model, the North American Mesoscale (NAM) were showing an area of low pressure heading into eastern New England, leaving Central New York more or less alone, with lake effect kicking in towards Tuesday night and Wednesday. The NAM, however, brought the storm much closer, giving our area its first accumulating snow of the year. Over the past 24 hours, however, the other models have come into agreement with the NAM, and suddenly we have a snow storm on our hands!

Now, keep in mind, I use 'snow storm' in the context of a normal October. We won't be seeing feet of snow, but for a first snow, this is pretty big. Here is what is happening:

An area of low pressure is beginning to form over North Carolina. Already moisture is spreading northward ahead of this, though most isn't reaching the ground yet. As this storm explodes and heads north, it will pull down some chilly air. That will make the precipitation that starts tonight and for the first part of tomorrow mostly rain. More importantly, however is that this rain will be snow not very high up in the atmosphere. As it melts, it will aid in cooling things down and changing precipitation over to snow. The higher elevations will see the change over first, probably as early as mid to late morning tomorrow. The lower elevations will begin to change over during the afternoon and evening hours. By tomorrow night, everyone should be seeing accumulating snow. Cayuga and Tompkins counties are not under any advisories, but Cortland county, with its higher hill tops, is under a Winter Weather Advisory.

The winds will be gusty with this as well. That, plus the heavy, wet nature of this snow could cause some branches to come down in the higher terrain. Had this come a week or two earlier, when the leaves were still on the trees, we would have some problems. We are lucky though and I am not anticipating many, if any, power outages.

This storm will be a quick mover, so real high totals aren't expected. The map below shows what to expect through 9AM Wednesday. Beyond that, Lake Effect snows will set up, but probably stay to our north, with additional accumulations. Stay tuned!

What happened...or rather, why it didn't

I've done some thinking and analyzing this morning, and I think I know where I went wrong with my forecasts last night. Lets start by looking at the last radar image I posted.



As you can see by the radar loop from last night, the snow developed mostly over Western Pennsylvania, West Virgina, and Eastern Kentucky, with lake snows further northwest over Ohio, Indiana and Illinois. Now we did and are still getting the lake enhanced snow, but the other area of snow never formed. Why? The answer lies in the two images I made below:





The area where the snow broke out was just west of and along the spine of the Appalachian mountains. These mountains acted as a lifting mechanism. As the winds hit the mountains, they had no where to go but up. Rising air cools, and with all the moisture left over from the storm, condensed into clouds and moderate to heavy snow. This is called upslope snow. Since there is not nearly the elevation gradient over our area as there is to the south, there was not enough lift to cause a secondary outbreak outside of the light lake effect. This just goes to show that there are so many factors that go into forecasting, which is why it is such a tough job.

And just in case you were wondering how much snow fell as a result of the upslope effect last night in the mountains, Accuweather.com meteorologist Jesse Ferrell put together a small list of some totals on his blog, which you can see here.

One other note about this storm. I have had over 800 hits on my website since Monday, including 571 yesterday! I just wanted to thank all of you for using my site and making it well worth my time. I really enjoy this and I am so happy that you are finding it useful! Thank you again!

Now, one final thing for now. For the past month or so, I have been working on a new website with a group of meteorology students here at SUNY Oswego. This site will give weather forecasts in a similar format to grotonweather.com for clusters of 2-5 counties. This will be a great source for specific weather information outside of our area. I am both the chief meteorologist of this new site, along with the forecaster for the Finger Lakes region. I have set this site up so that Tompkins, Cortland and Southern Cayuga are in a cluster. What does this mean for the future of grotonweather.com? No changes! I simply using grotonweather.com for that region, keeping everything the same for you. This new site will be launching this weekend and will have the URL www.empirestateweather.com, so check it out come Saturday!

storm after storm...then maybe a BIG one!

Storm system after storm system will continue to parade across the country. One is moving though right now with rain; another is forecast to move through Thursday. However, my focus is already on the weekend in what is already being dubbed "The Superstorm of 2007"!

A storm system will sweep out of the South Central US into the Southeast, reform off the coast of North Carolina and zip up the coast Sunday. This storm does look to be a fast mover, meaning snow totals will likely be lower than they would otherwise. You have heard me say it a million times before, but it is worth saying again: Its too early to give totals yet, but if I had to go out on a limb and hint at an amount, I would say a double-digit snow fall is possible.

I am now done with my first semester of college, which means I now have plenty of time to watch and forecast for this storm...that can't be said about the past week! So, keep checking back! I will most likely be doing updates at least twice a day from now on....one in the morning on the normal website, then a blog at night. Of course, that is just the minimum!

STAY TUNED!

East Coast Beware

This post is what is called "hype." That means its something that needs to be watched, but there is no promise it will or won't happen because its just too early.

However, the models have been handling this one consistently and has started to get Accuweather.com into an uproar...and in my experience, when Accuweather starts acting like they are now, there is a decent chance it will happen. What we are looking at is right now just a blob of clouds off the east coast of Florida. As the high pressure that has been over us for the past week or so slides off to the east, it will act as a big plug, preventing this blob from going anywhere. So, it will sit over warm waters and could spin up into a hurricane by later this week. It is too early to tell how strong, but a category 2 or 3 is possible. Its also impossible to tell where it will go. So, everywhere on the east coast, but especially the Carolinas and Virginia, needs to keep an eye on this one.

As for how it could impact us here in Central New York...we will have to wait and see. Keep checking back in the coming days for more on this potential storm!