Forecast: Heat Wave One Day Away
Today: Partly sunny, 20% chance of a p.m. t'storm. 85-88. | Tonight: Partly cloudy, 20% chance of t'storm. 69-74. | Tomorrow: Mostly sunny and hot. 94-98. A Look Ahead
FORECAST IN DETAIL
If you thought we might make it through summer without a heat wave, think again. A trio of days when the mercury reaches well into the 90s will scorch the region starting tomorrow, along with increasing humidity. On the plus side, we should avoid 90 today and the humidity will be bearable.
Today (Saturday): Though it won't be as pleasantly dry as yesterday, we'll have pretty nice summer weather today. Temperatures will max out in the mid-to-upper 80s with moderate humidity levels. Towards evening an isolated thunderstorm could pop up (20% chance) as a warm front advances toward the region. Winds will be from the southwest at about 5-10 mph. Confidence: Medium-High
Tonight: The warm front -- aka the harbinger of our coming heat wave -- will roll through the area. It might (20% chance) set off a thunderstorm or two in the evening, but more likely north of the District. Once the front passes by, temperatures won't fall much, just bottoming out in the upper 60s in the cooler suburbs to the mid-70s downtown. Confidence: Medium-High
Keep reading for the forecast for tomorrow and into early next week...
Tomorrow (Sunday): Here comes the heat. Abundant sunshine coupled with a very warm airmass building in from the southwest will send temperatures into the mid- and possibly upper 90s during the afternoon. Factoring in the humidity (in the medium to high range given dew points of 61-65), it will feel like 100 degrees at times.
There are a number of major sporting events that will coincide with the heat of the afternoon including the Legg Mason Tennis Final, the Nationals game against the Diamondbacks and the D.C. United showdown against Real Madrid. Athletes and fans should plan for very hot conditions and stay hydrated. A breeze blowing at only 10 mph or so from the west won't offer much relief. Confidence: Medium-High
Tomorrow Night: Partly cloudy and very warm and muggy. Lows only fall to the upper 70s in the city, with low 70s in the suburbs. Confidence: Medium-High
Monday may be the most oppressive day of the upcoming heat wave. Humidity will be higher than Sunday (dew points in the upper 60s) and indications are that temperatures will rise into the upper 90s. So it will probably feel like between 100 and 105 during the heat of the afternoon. Breezes from the west will continue at around 5-10 mph. Uncomfortably warm overnight, with lows only in the mid-to-upper 70s. Confidence: Medium-High
Tuesday may not be quite as hot as Monday as clouds increase in advance of an approaching cold front, but humidity levels may peak (with dew points at or even above 70). High temperatures will probably be in the mid-90s, but it may feel just as hot (i.e. above 100) as Monday factoring in the humidity. During the late afternoon and into the evening, thunderstorms are possible (30% chance) which may offer a little relief from the heat. Confidence: Medium
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