Rain chances and cooler temperatures by weekend
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Today: Mostly sunny and hot. Near 90. | Tonight: Mostly clear and muggy. 66-71. | Tomorrow: Sunny, hotter, and humid. 93-97. | Get Express Forecast by E-mail
Here we go again. Another surge of heat from an impressive mid-continent high pressure system aims for the East Coast to deliver a blistering bout of hot and humid conditions over the next few days. The peak heat should be Wednesday and especially Thursday with mid-to-upper 90s. This heat will challenge your outdoor activities and your air conditioner. But cooler and wetter weather will try to return by this weekend.
Today (Tuesday): Large surface high pressure passes overhead this morning and shifts our winds to come from a more west and southwest direction. This effectively turns on our heat and humidity pump, bringing in hot air from the Deep South (where 100-degree weather has been happening). Highs today should be near 90 under mostly sunny skies and light winds. Confidence: High
Tonight: Mostly clear and muggier with lows in the mid-to-upper 60s (suburbs) to low 70s (downtown). Light winds from the southwest. Confidence: High
Keep reading for the forecast through the weekend...
Tomorrow (Wednesday): Sunny skies dominate and intensify hot air over the area with a 93-97 range expected with probable 100-degree heat indices and bank thermometer readings. As Jason noted yesterday, expect the National Weather Service to issue a heat advisory. Light winds again from the southwest and west. Confidence: High
Tomorrow night: Mostly clear and muggy again with lows mostly in the low-to-mid 70s. Confidence: High
Thursday is our torchiest day of the week with highs likely into the mid-to-upper 90s. Full sunshine means a fast burn if you’re out too long with skin exposed and unprotected. High humidity will also increase the discomfort level again, similar to last week. A few isolated thunderstorms could develop out in the in the mountains to the west, but the D.C. area should remain dry. By Thursday night, muggy warm weather continues with lows in the low-to-mid 70s. Confidence: High
Friday finally starts to introduce enough clouds and storm chances (about 40%) to bring down temperatures a little bit as a cold front approaches. Highs should be in the low-to-mid 90s with continued high humidity. Friday night should see clouds, more scattered storms, and lows in the upper 60s to low 70s. Confidence: Medium
The weekend is getting a bit trickier as there is some suggestion that the cold front either stalls right over us or just to our north/west. That would keep us more humid, but there should be enough clouds and daily storm chances to keep temperatures lower (mid-upper 80s on Saturday and low 80s on Sunday). Partly cloudy skies and widely scattered storms Saturday night with lows in the mid-to-upper 60s. Confidence: Low-Medium