Wednesday, January 23, 2008

January 24th, 2008 Forecast

A clear and "normal" night temperature wise is expected around the Delaware Valley as temperatures drop into the upper teens to low 20's. Clouds will be on the increase later tonight as an Alberta Clipper currently situated over the Midwest begins to move in.
We might have some sunshine to start Thursday but the skies for the most part should be cloudy in the region. The clipper and associated frontal boundary will move into our region and combine forces with some energy that is going to spin up into a low pressure center off of the coast. This low pressure center will throw some moisture back into some portions of the region. Snow showers and flurries are possible in the afternoon but the only accumulations look to be in South Jersey and Delaware, where an inch or maybe two of snow will fall. If you are in Philadelphia or north and west, a coating is about all we'll see (if that) and that should accumulate on grassy surfaces.

Among computer forecasts, the NAM continues to spit out the most snowfall (3" possible in South Jersey and Delaware if it were right) whereas the GFS and EURO are less robust with snowfall and give South Jersey and Delaware about one inch. Given the NAM's awful performance with moisture the GFS' suggestion makes a bit more sense.
Friday and Saturday look pretty nice but cold as temperatures will be below normal. Sunday will bring a chance of rain or snow (possible northwest) as we see another clipper move off the coast and model guidance tries to spin up a coastal low from that. Temperatures going into next week will modify and warm in advance of a storm that could move through Tuesday night or Wednesday.