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Posted at 05:00 AM ET, 07/31/2011

Forecast: Hottest month ever closes with more 90s

New, interactive: CWG intern Justin Grieser checks who/what was hottest in D.C. on hottest day in 14 years Friday: Quiz | Gallery

Today's Daily Digit
 
A somewhat subjective rating of the
day's weather, on a scale of 0 to 10.

 
90s streak hits 2 weeks even though highs drop a few degrees & humidity could be worse.
 
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EXPRESS FORECAST

Today: Partly to mostly sunny. Stray p.m. storm? Low-to-mid 90s. | Tonight: Slight chance of evening storm. More muggy. Upper 60s to low 70s. | Tomorrow: Partly sunny. Chance of isolated p.m. storms. Low-to-mid-90s. | A Look Ahead | Get Express Forecast by E-mail

FORECAST IN DETAIL

We’re in a bit of a stagnant pattern here with a large upper-level high pressure across the Southern U.S. showing no sign of going anywhere soon. That means we likely close out the hottest month ever here in D.C. - and by a wide margin at that - with our 14th straight 90-degree day. With no big cool down in the foreseeable future, the biggest question is whether the heat may relent just enough mid-to-late week to break the 90+ streak before we get close to the record of 21 days.

Today (Sunday): Day 14 in a row with a high of 90 or above looks likely with plenty more sun in the skies. Storms probably stay south of the area but a stray one can’t be ruled out toward evening. Before then, partly to mostly sunny skies should be enough to get highs to the low-to-mid 90s. Humidity’s still not too bad but may creep up later in the day as winds swing around from the south. Confidence: High

Tonight: A slight chance of an evening storm mainly south of D.C. Otherwise, we’re looking at just a few scattered clouds for the overnight, with lows in the upper 60s (suburbs) to low 70s (downtown) and light winds. Confidence: Medium-High

Keep reading for the forecast through midweek...

Tomorrow (Monday): A weak cold front doesn’t make a dent in our heat, but does provide a chance of a few isolated afternoon storms mainly from D.C. to the north. Clouds increase with the heat of the day, but not before at least partly sunny skies lift highs to the low-to-mid 90s with moderate humidity. Confidence: Medium-High

Tomorrow night: We’ll keep the chance of an isolated storm through evening. Skies are partly to mostly cloudy overnight and lows range from near 70 in the suburbs to the mid-70s downtown. Confidence: Medium-High

A LOOK AHEAD

Most of Tuesday looks dry and warm, no surprise there, with mostly sunny skies as highs most likely top 90 once again - probably in the low-to-mid 90s. However, later in the day or at night, low pressure tracking across the Great Lakes may get close enough for a 30% chance of storms. Confidence: Medium

Forecast uncertainty rises considerably for Wednesday as the Great Lakes low pressure tries to move toward the area. If its clouds and showers/storms make it in here and early enough in the day, then our 90s streak could be broken with highs only in the upper 80s. If the low takes a more northerly track, then sunshine should be plentiful enough to push highs to the low-or-mid 90s. Either way, slightly cooler air behind the low may make reaching 90 another close call on Thursday. Confidence: Low-Medium

By  |  05:00 AM ET, 07/31/2011

Categories:  Forecasts

 
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