From the ABC 7 Weather team

D.C. Forecast: Warm and humid with rain chances returning to the forecast

August 17, 2014 - 11:11 PM
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A few isolated showers in the overnight hours, before the next likeliest round of widespread rain moves in by Monday evening.  Mild but humid into Monday morning.

Overnight:
Mostly Cloudy, Mild but Humid, Isolated Showers
Temps: 60s & 70s
Rain: 20% Chance
Monday Morning:
Mostly Cloudy, Mild, Humid, Isolated Showers
Lows: 60° - 70°
Rain: 20% Chance
Monday Afternoon:
Mostly Cloudy, Warm and Humid, Scattered Showers After 5PM
Highs: 82° - 87°
Rain: 80% Chance

 

A relatively weak jet-stream will allow small systems to roll overhead of the region keeping in chances for scattered showers and thunderstorms through the entire week! 

The first chance of rain is coming with a more traditional system moving west to east.  An area of low pressure with a leading warm front and trailing cold front, streams in cloud cover first tonight then brings the rain chances by Monday evening.  It's possible that an isolated shower or two comes in ahead of the system associated with the weak warm front, but for most of us the scattered showers look to hold off until after 5PM Monday while most of the rain appears to fall overnight Monday into Tuesday and begins to end by late morning Tuesday. 

After this first system, the weak flow of upper-level disturbances kicks in and that equates to chances of storms through the rest of the work week with mild morning temperatures, warm afternoons, and higher humidity along with the storm chances which are greatest each day in the warmest part of the day: afternoon/evening.  The pattern looks to take a final shift by next weekend, as a northeast flow sets up which typically keeps us under cloudy, mild/cool, and possibly rainier days.

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