Friday, June 29, 2012
From Storms To Heat
Once we go sunny, it should remain mainly sunny for the duration of the day. It doesn't look like we see much in the way of clouds nor in the way of any pop up thunder later on as the atmosphere will become "capped" and basically prevent significant cloud or shower development. That sets the stage for the oven.
The other question is how much humidity remains in place. Assuming winds pick up later, we should mix out some humidity and see dew point values hang in the lower half of the 60's...very similar to what we experienced during our heat events last week. While it will produce heat index values of 100-105, it will not be much worse than the air temperature this afternoon. However, any higher dew point values may result in a heat index value that pushes above 105.
All that together, it's going to be a nasty day as we approach 100 and see some bank thermometers probably exceed that mark through the region. Today's record is 102...probably out of reach in Philly but some places like Atlantic City or Wilmington (records of 98) have a better shot of hitting their record today. Heat continues through the weekend but there will be another shot of thunderstorms on Saturday night as another wave of energy pushing through like the one we got this morning.