Thursday, May 5, 2011

Looking mostly dry

Cooler air aloft will help kick off showers across New England today and then maybe some more rain on Saturday.

Today:  Limited sunshine, chance of showers, especially across the interior of New England, highs in thd 50s south, upper 40s north.

Tonight:  Partly cloudy, maybe a rain or snow shower north, lows in the upper 30s and low 40s south, low 30s north.

Tomorrow:  Partly sunny, slight chance of a shower north, highs in the upper 60s south, around 60 north.

Tomorrow night:  Partly to mostly cloudy, in the upper 40s to near 50 south, 30s north.

Saturday:  Mostly cloudy, chance of a showers and maybe an isolated thunderstorm, highs in the low 60s both north and south.

Discussion:

After the cold front moved through yesterday, we are left with a cold pool of air over our heads.  This will lead to some instability today as any sun we see during the first half of the day will heat up the surface and that warm air will quickly lift into that colder air.  Remember, warm air rises.  This will create more clouds and tap into the remaining moisture in the lower levels of the atmosphere to create rain showers.  I wouldn't be surprised if there are a few snow showers across the higher elevations of New England today either.  This includes tonight, where I think surface temperatures may get cool enough for snow to reach down into the valleys of Northern New England.

The cooler air will dissipate tomorrow, though a few isolated showers may still be possible across Northern NE.  It will be much warmer tomorrow as well thanks to a change in wind direction at the surface, from northwesterly to a west or southwest wind.

Saturday remains a bit of a tricky forecast.  There will be a low pressure system passing to the south of New England.  It looks like it gets close enough to trigger scattered showers across the region, particularly Saturday afternoon.  For now, I've gone heavy on the cloudiness.  If we get more sunshine than I expect currently, it will be warmer and I think our chance of showers and thunderstorms will increase with the more sunshine we get.  The more heating we have, the more unstable the atmosphere will be.

Beyond Saturday, condition looks dry with seasonable temperatures until late next week.  Temperatures in the 60s to low 70s, slightly cooler in Northern NE with a good amount of sunshine.

Thanks for reading!

-Jon K.

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