Wednesday, March 23, 2011

Quick Update on The Wintry Wx North, Rain/Sleet South

No changes were made to the advisory or warning area by the National Weather Service.

It is currently 40 degrees at the Morristown Municipal Airport. The dew point was 28 degrees and rising with the increase in moisture. The dew point will be slow to rise, so as the precipitation begins to fill in and become steadier, the temperatures will drop to the dew point value which would likely be around 34-37 during the start of the heavier precipitation. We call this evaporative cooling.

It won't drop to 28 degrees for an air temperature though since the dew point will rise with the increasing moisture...

The 00z NAM is much warmer than the previous NAM runs. The chances for this ending as snow, after a change to rain, with the second piece of energy would appear to be dwindling even further from this morning. The ending still needs to be watched carefully.

Steady band of snow appears to be developing...mixed with sleet and rain in Northern New Jersey...and again as this picks up...it will switch to snow.

Band around Maryland and Delaware is more broken...southern areas will see mainly rain, but even a few snowflakes or sleet pellets are possible here.

It looks like a damp, miserable day is arriving with a tease of snow.

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