Sunday, July 24, 2011

My Morning Sauna

This should be the last morning of excessive heat and humidity before we get a bit of a break in the excessive department for a couple of days.   Temperatures this morning range from the upper 70's in the cooler enclaves to the mid 80's in the city...with heat index values as high as the lower 90's in Philadelphia and Atlantic City already at 7 AM.   The city and suburban counties are under an excessive heat warning, with South Jersey and Delaware under heat advisories this afternoon.

Yeah...major yuck weather continues!

The good news is that temperatures and heat index values take another...slight...step downward today.   While it will still be hot with temperatures in the 93-97 range inland and in the low 90's at the Shore, the heat index value should top out at or just above 100...a few degrees cooler than yesterday.   The other bit of good news is the prospect of scattered afternoon and evening thunderstorms!   Radar overlay on the temperature graphic up above shows a few showers and storms lurking across Central Pennsylvania.   More should develop this afternoon, some of them locally strong with gusty winds and downpours.   Timing from the NAM computer model centers on the 3-6 PM range in the city, 2-5 PM north/west, 4-7 PM at the Shore but given the instability in the atmosphere it would not surprise me if things popped before that.    There is some uncertainty regarding how much thunderstorm activity pops up -- the NAM is more widespread in nature, the GFS much more widely scattered and the EURO splits the difference.   As is typical with summertime thunder events, some will likely get more rain/thunder than others...and some of the others will see nothing.

More:   Current Weather Page