Wednesday, July 18, 2012
Hot To Start, Stormy To Finish
It's quiet now and should remain that way through the morning hours, with sunshine filtered through a few patches of high clouds. This will get temperatures to take off, pushing us to the upper half of the 90's this afternoon around the region. Adding dew point values in the lower 70's in the region and the resulting heat index will range between 100 and 107 at peak heat throughout the region. Heat advisories (orange shading on the graphic above) and warnings (magenta) remain in place today on what may end up being the most oppressive day of the year from a heat index standpoint. We were hotter back on the 7th (101 in Philly) but heat index values were not much higher than the temperature. Today will feature higher humidity and temperatures just a couple of notches cooler -- it *could* end up a bit more oppressive.
Regarding the stormy part of the forecast, computer modeling continues to suggest that thunderstorms are likely this afternoon and evening across the region. Some of those storms will be severe with gusty winds, perhaps hail, as well as heavy rainfall as moisture content in the atmosphere is high. Timing suggests thunderstorms are possible after 3 PM, pushing south and southeast through the region....with the earlier timing focused on the Lehigh Valley.