Hot Humid Chance for Storms Late Wednesday & Thursday
Today will mark day 3 of 90 degree plus highs for much (but not all) of Eastern Pennsylvania to Southern New England. We continue to be in a place where weather systems aren’t moving very much and we are cut off from the flow from Canada to advance a cooler air mass. Humidity levels will be increasing today and highs will reach into the 90s in most places. It will be a day of sunshine and a near zero chance for a shower or thunderstorm. South winds mean that south and east facing shorelines will likely see highs 5 to 10 degrees lower than areas just inland.
SATELLITE WITH LIGHTNING STRIKES
WEATHER RADAR
Most lows tonight will be in the upper 60s to middle 70s as dew points hover just below these numbers and that sets us up for a hot humid Wednesday. We will however see a frontal boundary approaching from the west. This boundary has been setting off shower and thunderstorm activity over parts of the Midwest and it will be getting close enough Wednesday that we could see scattered thunderstorms triggered during the afternoon and evening hours.
The issue with this frontal boundary is that the air mass behind it is not much different than the one ahead of it. The front will slow down and it will not pass through until Thursday so the risk for storms will continue though for now the Storm Prediction Center is not indicating severe weather risk on either Wednesday or Thursday.
This leaves us with a hot and humid Wednesday. Dew points will be in the uncomfortable 70s. Highs will reach the low and middle 90s in most places with limited relief at the shore. Scattered storms will develop and the highest chances will be inland. Thursday will be a little less hot but still hot and humid with a slightly higher chance for thunderstorms. Highs will be in the upper 80s and lower 90s.
Since the air behind the front is about the same ahead of it, temperatures Friday will reach the upper 80s to some lower 90s. There may be a little bit of humidity relief with dew points back into the low and middle 60s, only to see that go back up over the weekend. We will see sunshine Saturday and we are likely to see sunshine for both weekend days with highs reaching the 90s again and little chance for shower or thunderstorm act
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