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Mid-Atlantic Snow forecast For December 21-23 (Initial)


Ellinwood

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Since my forecast maps cover parts or all of several different sub-forums in the eastern US, I've decided to just post my snowfall forecasts on this blog to get more exposure without having to spam all of the different sub-forums with my forecast.

For those of you who don't know, my main focus with snow forecasting is centered around the Mid-Atlantic. The geographical location does not regularly change from storm to storm, and neither do my snowfall contours. You can interpolate snowfall totals within the contours (for example, the outer edge of the 2-4" contour is for 2", and in most cases the center of the 2-4" contour is closer to 3-4"). I usually try to issue an initial map and one updated (final) map, though sometimes I like to throw in an a second update. Other times, I might only issue one forecast near the start of the event. No updates are issued once the snow starts to accumulate within the forecast region (except in rare cases when the accumulation starts just before I get home from work).

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Most if not all of the snow with this disturbance will accumulate well behind the cold front, with lake-effect snow bringing some respectable totals to western PA and WV. Most of the snow will fall Friday morning through Saturday afternoon. Low-level temperatures will limit accumulations across central and eastern PA.

South and east of the 1" line could see snow in the air Friday, with little to no accumulation expected.

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This is where I made the base map: [url="http://nationalatlas.gov/mapmaker"]http://nationalatlas.gov/mapmaker[/url]

Best thing to do is grab the map in parts and make them separate layers in Photoshop, then draw in the contours below the lines and labels.
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