Moderate Risk For Pennsylvania!
Today's monster storm is shown on the map below (pressure/wind/satellite/radar) via AccuWeather.com RadarPlus.
It's rare to see a Moderate Risk of severe thunderstorms issued by the SPC (average 6-8 a year maybe).
It's even more rare to see one issued in here in Pennsylvania (average probably 0-2 per year).
And it's even more rare to see a Moderate Risk issued in December.
Today, we have all three. Yesterday, we brought you Henry's prediction that a major severe weather outbreak was likely. This morning the SPC upgraded their Slight Risk to a Moderate and says:
Dewpoints, one measure of the atmosphere's instability are unusually high (up to 65 degrees) in eastern Pennsylvania, Maryland and Delaware this morning, as shown by the map from our Pro site:
More information is available in our Weather Headlines (PREMIUM | PRO) and Breaking Weather News Page. One headline says:
In fact, there's quite a mix of advisories out for the Ohio Valley and Northeast today:
