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Posted at 05:00 AM ET, 07/23/2012

D.C. area forecast: Hot, humid, sometimes stormy pattern returns


Today: Partly sunny, slight chance of late day storms. 90-95. | Tonight: Possible evening storm, partly cloudy. 69-76. | Tomorrow: Partly sunny, chance of strong late day storms. 90-95. | Get Express Forecast by E-mail


A somewhat subjective rating of the day’s weather, on a scale of 0 to 10

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After three cooler than average days - the only such days this month - the heat is back. Most days this week, if not all of them, will be warmer than average. (The days with the least heat and humidity - and closest to average - look to be Wednesday and Sunday.) Meanwhile, an active jet stream to our north may generate thunderstorms several days this week.

Today (Monday): Back to work, and back to the old routine of heat, humidity and the opportunity for late day thunderstorms. We’re not talking record-threatening heat, but still toasty highs in the low-to-mid 90s under partly sunny skies and a light breeze from the southwest. With moderately high humidity levels, it feels like 95-100. There’s a 20-40 percent chance of late day thunderstorms, highest odds to the northwest. Isolated storms could be strong to severe. Confidence: Medium-High

What is the Storm Threat Level?

Tonight: Except for any evening thunderstorms (20-40 percent chance), skies are partly cloudy and it’s muggy. Lows range from near 70 in the cooler suburbs to the mid-to-upper 70s downtown. Confidence: Medium-High

For related traffic news, check out Dr. Gridlock. Keep reading for the forecast through the weekend...

Tomorrow (Tuesday): Partly cloudy, very warm and humid once again. Ingredients could (40-50 percent chance) come together for strong-severe afternoon and/or evening thunderstorms as an upper level disturbance and cold front move through the area. Highs head up to the low 90s. Confidence: Medium-High

Tomorrow night: Evening storms are possible (30-40 percent chance). Otherwise, it’s partly cloudy and not quite as muggy. Lows range from the mid-60s in the cooler suburbs to the low-to-mid 70s downtown. Confidence: Medium-High


Wednesday may earn the title as nicest day of the week. Yes, there’s enough warm sunshine that temperature reach the mid-80s to as high as 90, but humidity levels are low-to-moderate (dew points in the 50s by the afternoon). Some clouds increase Wednesday night as a warm front approaches, with lows 66-74 (suburbs-city). Confidence: Medium-High

A warm front lifts through the region Thursday, probably early. It might (20-30 percent chance) ignite a storm or two. The heat and humidity make a speedy return, with highs reaching the low-to-mid 90s. Muggy Thursday night, with lows 71-78 (suburbs-city). Confidence: Medium

A cold front drifts through the region Friday and Saturday. Ahead of the front Friday, it’s hot and humid, with highs into the low- to maybe mid-90s. Storms are possible (30 percent chance) Friday afternoon/evening. Partly cloudy, Friday night with lows 68-75 (suburbs-city). On Saturday, the front may or may not have pushed through the region. Its proximity, in any event, means temperatures are still very warm (highs near 90) and storms are a possibility (30 percent chance). Confidence: Low-Medium

Drier and somewhat cooler air probably start feeding into the region Saturday night into Sunday (assuming the front doesn’t stall), with partly cloudy skies. Lows Saturday night are in the 60s to low 70s (downtown) with highs Sunday 85-90. Confidence: Low-Medium

By  |  05:00 AM ET, 07/23/2012

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