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Posted at 05:00 AM ET, 05/20/2012

Forecast: Alberto contributes to unsettled conditions


Today: Mostly sunny a.m., increasing p.m. clouds. Mid-70s to low 80s. | Tonight: 50% chance of light showers. Low-to-mid 60s. | Tomorrow: Mostly cloudy. 60% chance of showers/storms. 70s. | A Look Ahead | Get Express Forecast by E-mail


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

Not much to complain about, but a touch of afternoon mugginess and increasing clouds keep us from perfection. Get the Digit on Twitter| Discuss on Facebook


Ladies and Gentlemen, welcome the first named storm of the 2012 hurricane season, Tropical Storm Alberto. So far his center is forecast to stay well away from us, but that doesn’t mean he won’t affect our weather. The east-to-west (onshore) circulation around the north side of Alberto means increasing clouds and humidity levels here in the D.C. area over the next couple days. By this evening, the threat for showers arrives, too. Warm, unsettled weather with the potential for some thunderstorms stays through midweek.

Today (Sunday): Even though Alberto is well south, its associated onshore flow means increasing afternoon clouds after a mostly sunny morning, and the chance of a few afternoon showers mainly across Southern Maryland. But overall, for most of us it’s a warm and pleasant day with highs near 80 to the low 80s, except for mid-70s along the Chesapeake Bay and in Southern Maryland. Breezes come from the northeast around 10-15 mph. Confidence: Medium-High

Tonight: The center of Alberto edges closer to the South Carolina coast, and the onshore flow to its north keeps us on the humid side. That spells cloudy skies and a 50% chance for some light showers. The clouds and increasingly moist air lead to mild overnight lows in the low-to-mid 60s. Confidence: Medium

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

Tomorrow (Monday): Alberto doesn’t appear to be a direct threat for the D.C. area. But we feel its effects in the form of a 60% chance of showers, and the possibility of afternoon thunderstorms that could produce locally heavy rain. Amidst mostly cloudy skies, it’s a warm and somewhat humid day with highs in the 70s. Confidence: Medium

Tomorrow night: Unsettled conditions stick around with mostly cloudy skies and a 50% chance for showers. With the tropical influence, we’re mild and a bit muggy once again with lows in the low-to-mid 60s. Confidence: Medium


What remains of Alberto combines with an approaching cold front to give us a decent (60%) chance for showers and afternoon thunderstorms on Tuesday. We’ll again have mostly cloudy skies and some humidity as highs top out in the 70s. Shower chances should diminish Tuesday night, but probably don’t die out completely as lows dip to the low-to-mid 60s. Confidence: Low-Medium

For Wednesday, expect the unsettled pattern to continue with a stalled front giving us a 40% chance of showers and thunderstorms. Partly to mostly cloudy skies may yield enough sun to warm highs to the upper 70s to near 80. Confidence: Low-Medium

By  |  05:00 AM ET, 05/20/2012

Categories:  Forecasts

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