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.
Comments
amazing, i'v been a weather buff for 38 years and have never seen anything like this. i live in Middletown, MD and just look at the time lapse radar loop from 6pm until now, 8:15pm, huge areas of thunderstorms and embeded rain showers and a tiny sliver of precipation free area about 4 miles wide and 30 miles long hovers right over middletown, we received not one drop of rain, thurmont has received nearly 1 inch int he last hour, hagersown, 0.5, braddock heights, 0.5, to our west same thing, it just astonishes me, now at day 19 with no rain and i want to figure this out, it makes no sense how this tiny area of Frederick County is not receiving any rainfall even with such a wide swath of rain around us like right now.
John
Posted by: John Moser | August 4, 2010 8:21 PM
Is there still any possibility to the notion that August would cool off a lot toward the latter half of the month? Please, pretty please?
FR: It's bound to cool off some. But the long-range outlook calls for above-average temperatures for August, September and October.
Posted by: lesley | August 5, 2010 4:23 PM