Forecast: The heat strikes back
Heat & humidity returns; summer is not done with us
updated at 10:30 a.m.
Today: Mostly cloudy. 20% chance of p.m. storms. 86-89. | Tonight: Partly cloudy. 72-76. | Tomorrow: Partly to mostly sunny. 30% chance of evening storms. 92-95. | A Look Ahead | Get Express Forecast by E-mail
FORECAST IN DETAIL
Yesterday's high of only 83 at National was a comfortable five degrees below normal - making for a second consecutive "cool" afternoon. But the climatology calendar reminds us that we still have the second hottest month of the summer yet to go, so here we go. Heat and humidity should return in force the next few days and remind us of the "dark side" of summer. We must once again brave highs in the 90s, high humidity, and p.m .thunderstorm threats.
Today (Tuesday): A big ridge of high pressure that is currently delivering strong heat to the southern Midwest, Tennessee Valley, and the South (104 in Dallas yesterday!) will begin to expand north and east shoving hotter weather back into the mid-Atlantic starting today. Winds from the south will help push our high temperatures into the upper 80s. We should feel higher humidity too and there is a 20% chance for widely scattered thunderstorms. Clouds are being pesky today, but if they break, temperatures could sneak just a little higher. Confidence: Medium-High
Coverage: Very widely scattered
Most likely timing: 4 p.m. to 8 p.m.
Tonight: Muggy weather overnight with lows in the low-to-mid 70s, partly cloudy skies, and still those light winds from the south bringing in more heat from the hot southern high pressure ridge. Confidence: Medium
Keep reading for the forecast through the weekend...
Tomorrow (Wednesday): Day two of summer's return will only feel worse with highs in the middle 90s more likely and partly to mostly sunny skies. Relief could come in the form of late afternoon or evening thunderstorms (30% chance). Those heat index values should push into the low 100s. Light winds from the south will continue to pump in the heat. Confidence: Medium
Tomorrow Night: A 30% chance of storms continues with partly cloudy skies and warmer overnight temperatures in the mid-to-upper 70s. Those air conditioners will probably need to keep running.Confidence: Low-Medium
Thursday like last week should be our most humid and generally the hottest day of this week. Temperatures should be in the mid-to-upper 90s, but we have a much better chance to disrupt that heat by late afternoon and evening due to a stronger line of thunderstorms (could be severe?) accompanying a cold front. Look for partly to mostly sunny skies early becoming more cloudy late in the day. The chance of thunderstorms is 60%. More storms are possible Thursday night (40%) with lows in the low-to-mid 70s. Confidence: Low
Friday behind the cold front means gradually cooling temperatures and lowering humidity. Highs may still make the low 90s, but drier humidity will be noticeable. Skies should be partly to mostly sunny with light breezes. A pleasant Friday night is expected with temperatures in the 70s possibly heading toward a low in the upper 60s toward dawn. Confidence: Low-Medium
The weekend looks like it will once again reward us for struggling through a hot summer work week. Right now, we are looking at a cooler air mass moving into the area with highs in the 80s and lows in the 60s to around 70. Partly to mostly sunny skies are anticipated to augment the weekend weather experience. But enjoy it while you can as more heat may be poised to return later next week. Confidence: Low-Medium
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