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Posted at 05:00 AM ET, 07/17/2011

Forecast: Ramping up to a loooong heat wave; temps toward 100 by week’s end

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

 
Still nice enough - warmer but not overly humid - but the digit is definitely headed down as heat readies for long stay.
 
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EXPRESS FORECAST

Today: Mostly to partly sunny, a little more humid. Near 90. | Tonight: Mostly clear, mild. 67-74. | Tomorrow: Partly sunny, muggier still. Isolated late-day storm? Low-to-mid 90s. | A Look Ahead | Get Express Forecast by E-mail

FORECAST IN DETAIL

It’s sort of a transition day today as conditions aren’t overly oppressive, but they’re definitely headed that way and possibly for quite some time. By mid-to-late week, we’ll look longingly back at today’s garden-variety heat and humidity as highs likely head into the mid-90s to near 100 and heat indices soar to near 100-110. Highs in the 90s to near 100 may well continue through the weekend into the next week. Along the way, we have a couple chances for storms.

Temperatures: Latest D.C. area temperature map powered by iMapWeather (base map by Google). Click and hold on map to pan. Double-click to zoom. Refresh page to update. See larger map on our Weather Wall.

Today (Sunday): Still not too shabby as high pressure moves off the coast and return flow from the south begins to bump up our dew points just a tad (low-to-mid 60s). Mostly sunny skies may turn partly cloudy in the afternoon and those in the western highlands may see a few showers pop. Here in the metro area we should stay dry with highs near 90 and a light breeze from the south. Confidence: High

Tonight: Our evening and overnight are warmer and muggier than what we’ve enjoyed recently. Any clouds diminish after the sun fades, leaving us with mostly clear skies and overnight lows near 70 to the low 70s. Confidence: High

Keep reading for the forecast through the week ahead...

Tomorrow (Monday): Tomorrow, we finally walk outside and say, “I guess it had to end sometime...” Both the heat and humidity edge higher with highs in the low-to-mid 90s. Mostly sunny skies become partly cloudy during the afternoon, with an outside shot (20% chance) of a thunderstorm moving in from the northwest toward evening. Confidence: Medium-High

Tomorrow night: The chance for a storm rises a bit to around 30%. Otherwise, mostly cloudy skies add to the ever-increasing ”blech” factor, helping to keep us warmer than we’d like with lows in the mid-to-upper 70s. Confidence: Medium

A LOOK AHEAD

A weakening front passing through Tuesday could still be strong enough to ignite some showers and storms (30-40% chance). What it probably won’t do is bring a break in the heat, as partly sunny skies lift highs to the low-to-mid 90s and the humidity gets even stickier. Mid-to-upper 70s again for Tuesday night lows. Confidence: Medium

By Wednesday, the heat intensifies as partly to mostly sunny skies help highs to the mid-90s, and high humidity threatens to send the heat index past 100. The front isn’t much of anything anymore, but what’s left could still provide a focal point for a few storms (30% chance). Pretty uncomfortable Wednesday night with muggy lows in the mid-70s to near 80 . Confidence: Medium

We really turn on the oven late week and potentially into the weekend. Highs make a run at the upper 90s to near 100 and the heat index could close in on 110. Nights look to offer little relief with lows in the mid-70s to near 80. The way things look now, we could be adding even more 90+ days to our tracker (see left sidebar below radar) into the following week. Confidence; Medium

By  |  05:00 AM ET, 07/17/2011

Categories:  Forecasts

 
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