5:45 Update: Today's Semi-Official Highs
National 96° (3:50pm)
Dulles 95° (3:08pm)
BWI 97° (2:09pm)
Baltimore Downtown 97° (2pm)
NowHot: Whether it's Trane, Carrier, or Kenmore, air conditioning is in high demand in the Washington DC metro area this afternoon as a heat wave begins settling in for the next several days. By 1pm, temperatures were into the 90s in most places. Most locations between the Blue Ridge and the Bay are now reporting heat indexes over 100. The highest hourly temperature at National has been 96° and at Dulles, 94°. By late afternoon, a line of thunderstorms developed from the northern Baltimore suburbs to the far northeastern corner of Maryland.
Tonight and TomorrowExcessively hot: Temperatures will remain quite warm overnight, with lows ranging from near 80° in the city to the mid 70s in the 'burbs. There is a slight chance of widely scattered thunderstorms through this evening. Tomorrow will be hotter than today, with highs near 100° and heat index values as high as 110-115.
Scroll down to Jason's post below for a heat wave chronology and outlook through the weekend.
Tropical TopicsThe tropics are still relatively quiet, but the National Hurricane Center is tracking a couple of tropical waves in the Atlantic and a low pressure area off the coast of the Carolinas.
TV Weather RulesToday's WaPo TV section reports that Channel 5 has finally run out of "Seinfeld" and "Friends" episodes and will be starting a new 30-minute news program at 11 tonight. The station is quoted as saying that the show, called "The Edge", will "almost always" lead off with the weather report. Another innovation: a chairless anchor. Good luck, Sue, on your new gig.