This is extreme and dangerous heat, especially for vulnerable groups such as the homeless, the elderly and those who work outdoors. Find ways to stay cool, hydrated and avoid strenuous exercise during the hottest parts of the day. Mercifully, the heat wave will end on Thursday.
Today (Monday): If you’re out for more than a few minutes on your walk to work, you may need to shower by the time you arrive. The heat is evident during the day and worsens until it peaks in the mid-afternoon. Highs will be in the 90s and low 100s, challenging records of 100 at Reagan National, 98 at Dallas and 102 at BWI Marshall. Factor in the humidity (dew points near 70), it will feel like 105 to 110. Like Sunday, there could be a few heavy showers, but most of us will stay dry. Light winds from the west and southwest at 5 to 10 mph. Confidence: Medium High
Tonight: Partly cloudy and a bit muggy. In areas near downtown, it will stay in the 90s into the evening, with lows only near 80. In our cooler areas, lows will be near 75. Confidence: Medium High
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Tomorrow (Tuesday): Like today but less chance of rain or storms. Highs will return to the 90s and lows in the 100s with highs of 105 to 110. A record high of 104 at three airports (set in 1988) is a bit of a stretch but not out of the question. Confidence: Medium High
Tomorrow night: It was another uncomfortably messy night with lows in the 80s downtown and 70s elsewhere. Showers or thunderstorms are possible overnight as a front approaches. Confidence: Medium High
A look ahead
One more chance to score a century Wednesday, with heat indices of 105 or higher, but blowing into a cold front. As the vapor collides with air, expect several showers and storms in the afternoon and evening, some of which will be severe. Showers and storms should taper off after sunset, with overnight lows in the 70s. Confidence: Medium High
On that day Thursday, the cold front is slipping south, but close enough to keep rain and storm chances in the forecast, especially in the south and east of the county during the afternoon and evening hours. Not too hot in the mid to upper 80s. After evening storms, Thursday night will be partly cloudy, with a low around 70 to 75. Confidence: Medium
Friday Partly sunny, moderate humidity and highs in the mid to upper 80s make for a great day of the week. Partly cloudy overnight, with temperatures in the 65s to 70s in cooler areas and 70s to 75s in cities. Confidence: Medium
On Thursdays and Fridays the stalled forwards in the south can try to lift to the north Saturday, clouds and a chance of showers and storms, especially south and east of Washington. As the front moves northward Sunday, Temperature and humidity will increase. Highs could be in the 80s on Saturday and 90 on Sunday. Lows should mostly be in the 70s. Confidence: Medium
Snow Probability Index
On a scale of 0-10, a daily estimate of the likelihood of at least 1 inch of snow over the next week.
