top border

Please note, not all links may be active. This site is a snapshot of an earlier time.

The Switch was Hit, the Heat is On
Heat indices as high as 105 Saturday

Jason Samenow @ 6:30 PM

Heat Advisory in Effect Saturday from 11am to 8pm

After five straight days of temperatures mainly in the 60s and 70s, we approach 90 today and 100 tomorrow. To make matters worse, the humidity will be brutal. A cold front and some thunderstorms will cool things down a bit Saturday night into Sunday, but it will remain on the warm side.


Forecast Confidence: HighSun emerging, much warmer. Low clouds will gradually burn off this morning as a warm front finally passes through the region. By afternoon, expect a mix of clouds and sun, humid conditions and high temperatures between 85-90. Overnight, it will be partly cloudy and very muggy, with lows 72-76 (suburbs-city).


Forecast Confidence: HighUncomfortably Hot and Humid. Storms possible late. Saturday will likely rank among the top 5 hottest days this summer and will probably be in the top two for heat index (how hot it feels) given very high humidity levels. High temperatures will range between 95-100, but with dewpoints in the low 70s, heat indices will be near 105 degrees. Definitely take it easy and drink plenty of water. Thunderstorms could develop late in the afternoon and into the evening hours (30%), offering some relief. The storms may have strong winds and will put down some very heavy rain in spots. Overnight, it will be mostly cloudy with a 30% chance of storms as a cold front moves through the region late. Low temperatures will likely be in the low 70s.

The NAM forecast models shows surface temperatures early tomorrow afternoon in northern Virginia and DC between 100 and 102. This is probably a bit aggressive, but highs in the upper 90s and some isolated triple digit readings are possible. Temperatures will likely be a bit cooler near the Potomac river and Chesapeake Bay.


Forecast Confidence: HighVery warm, chance of showers and t'storms. The cold front which passed through overnight is likely to stall just south of the region. This will slow the progression of cooler and drier air from the northwest. As a result, while temperatures won't be as hot as Saturday, it will still be on the warm side, with high temperatures in the low 90s. Given the proximity of the front and lingering low level moisture, thunderstorms are possible everywhere (30%), but especially south of DC.

This Weekend On

Saturday: Track the hot temperatures and possible thunderstorm development with Jason Samenow.

Sunday: Columnist Andrew Freedman will be back with a new and entertaining Undercast submission.

Comments are closed for this archived entry | Link | email post Email this post