From the ABC 7 Weather team

D.C. Forecast: Start of a week-long heat wave

July 14, 2013 - 11:45 AM
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Today starts what will likely be a succession of sultry days.  Look for a very warm and humid Sunday with mostly sunny skies and highs near 90.   

This Afternoon:
Mostly Sunny, Hot, & Humid
Highs: 88-92
Wind: S 5-10 mph
Mostly Clear, Warm, & Muggy
Lows: 68-76
Wind: SW 5-10 mph
Mostly Sunny, Hot, & Humid
Highs: 90-95
Heat Index: 95-100

We've had a few short-lived heat waves this summer, but the longest yet is likely starting today.  And while the highest temperature recorded to date has been 94, readings this coming week could sizzle as high as 97.  Factoring in high dew point values that could send the heat index into the 100 degree range, dangerous conditions and thus the first Heat Advisories of the season are possible. 

With high pressure expected to dominate the region through next weekend, each of the coming days will aim for the 90s, feature mostly sunny skies, and promise only a slight chance of a shower to provide some cooling relief.  The hottest days will likely be in the latter part of the week as downslope winds from the Appalachians drive the mercury up.  Prepare to stay cool and safe this week as Mother Nature runs her fever!

NOTE: The longest stretch of 90 degree days this year was the four-day period from May 29th through June 1st.  The other two heat waves, both of 3 days duration, ran from June 24th through the 26th and July 5th through the 7th. 


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