The heat ... it's back
It's back into the 90s for Central Maryland. The National Weather Service has posted Heat Advisories for all of Central, Southern Maryland and the Eastern Shore (orange on the map), effective from 11 a.m. to 8 p.m. Thursday. The forecast high for BWI-Marshall is in the mid-90s. with high humidity. That will push Heat Index numbers to near 105 degrees.
This afternoon's high at the airport reached 92 degrees, with dew points oppressive in the mid-70s. Friday, too is expected to top 90 degrees, with a forecast high of 92. If they're right, it will bring the count of 90-plus days this year to 44. The record is 54 days.
The weekend looks a little cooler (but still above average for the dates), with highs in the upper 80s, before temperatures push back into the low 90s early next week.
Once again, you can blame high pressure off the East Coast for sweeping all this warm, moist air north from the Gulf. Scattered thunderstorms Wednesday or Thursday could drop up to two inches of rain on some locations.
But we'll need a cold front, due late Thursday into Friday, to bring real relief. Temperatures won't drop dramatically, because winds from the west will be heated as they move down off the Appalachians. But it will be noticeably less humid, forecasters say.