From the ABC 7 Weather team

Another Derecho?: NO nothing like Friday

July 3, 2012 - 03:45 PM
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Some evening thunderstorms but scatter and no winds like Friday

Lots of chatter on the Internet because of a private forecaster mentioning the word "Derecho" again for later today or this evening.  Look at the regional radar 
ZZZZZ

Yes there are thunderstorms across Pennsylvania and they will be moving south toward our area as one of the high res models shows 

ZZZZZ

 Hi res simulation of radar at 8PM tonight

But the humidity at the ground and higher in the atmosphere is downright dry compared to Friday.  The "fuel" for anything such as Friday is not there.  Here's one of the charts from the NWS Storm Prediction Center 
ZZZZZ

What is called CAPE or essentially the energy in the air available for thunderstorms will be almost 1/50th of the energy in the air that produced that historic storm Friday night.  NO DERECHO this evening or overnight.  Some thunderstorms and some gusty winds which will not help with the efforts to restore power, and more heat ahead but nothing like Friday!!!

 

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