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Posted at 05:00 AM ET, 09/04/2012

D.C. area forecast: High humidity with roving rains from Isaac’s remnants

EXPRESS FORECAST

Today: Scattered showers/storms. Some heavy. 84-88. | Tonight: Scattered showers/storms. 70-74. | Tomorrow: Warmer, still humid with more scattered showers/storms. 85-89. | Get Express Forecast by E-mail

TODAY'S DAILY DIGIT

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


Many areas still need the rain, but some of the heaviest rains can create problems. And I don’t care for this late-summer, tropical humidity. Get the Digit on Twitter| Discuss on Facebook

FORECAST IN DETAIL


This very humid, late-summer, Isaac-enhanced air mass stuck over our area creates a complicated precipitation forecast. Those of us traveling from the Atlantic seashore yesterday drove through some very heavy rains to find most of the DC-area largely missed. This might tempt us to let our guard down about rain expectations over the coming days, but this particular air mass can trigger heavy showers and sometimes thunderstorms essentially at any time. And we are stuck in this soup until this weekend when a big cold front sweeps the area. So be prepared for more rain risks and sometimes heavy downpours.

Today (Tuesday): Partly to mostly cloudy skies with moderate to high humidity as maximum temperatures range from the mid-to-upper 80s. Like yesterday, we could see some peeks of sunshine at times. Otherwise, watch out for risks of random showers and storms. This tropical air mass means that if you get some rain today, it could be a slow-moving, heavy rain-producing deal again. Most areas should see something, so we’ll keep a 60% probability for rain. Light breezes at 5-10 mph from the south. Confidence: Medium

Tonight: Partly cloudy and muggy with scattered showers and storms. Again, some of these could be heavy. And the odds are good at about 60%. Lows only in the low-to-mid 70s (we should be down into at least the 60s for lows now). Confidence: Medium

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

Tomorrow (Wednesday): More of the same with scattered shower and storm risks (60% again), but the temperatures start to get a bit warmer and more uncomfortable. I’m thinking mid-to-upper 80s, but if a few spots get a bit more sunshine, we could get a few 90-degree readings out there. Partly to mostly cloudy skies with light winds mainly from the south again. Confidence: Medium

Tomorrow night: Partly cloudy and muggy with lows near 70 to the low-to-mid 70s (warmest in city as usual) along with a 40% risk of scattered showers and storms yet again. Confidence: Medium

A LOOK AHEAD

Thursday and Friday could see less coverage of mainly afternoon to evening showers and storms as the remnants of Isaac ease out the area and generally lose their punch. Nevertheless, the muggy air mass should be able to trigger more storms/showers, so we maintain a running 30% risk through this period. Partly cloudy skies may open up a bit more on Friday. Highs in the upper 80s to maybe low 90s prevail with lows both Thursday and Friday night near 70 in the outer suburbs to the middle 70s in the city. Confidence: Medium

The weekend unfortunately is looking messier right now as a vigorous cold front approaches our area. Scattered showers and storms through the period combined with another increase in cloud cover should hold high temperatures a bit lower in the low-to-mid 80s. There is a chance we could get the cold front out of the way by Sunday afternoon to return some partly sunny skies and lower dew points (finally). This at least sets the stage for a cooler second week of September. Confidence: Low-Medium

By  |  05:00 AM ET, 09/04/2012

Categories:  Forecasts

 
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