6:00 AM | Summer-like weekend with warmth and humidity...sub-tropical Ana forms off the Southeast US coastline

6-Day DC Forecast

Today

Partly sunny skies, quite warm, highs in the low-to-mid 80's

Tonight

Partly cloudy, mild, a shower possible late along with patchy fog, lows near 60 degrees

Saturday

Patchy fog early; otherwise, partly sunny skies, quite warm, rather humid, chance for a shower or thunderstorm, low 80’s

Saturday Night

Possible shower or thunderstorm early; otherwise, mostly cloudy skies, mild, patchy fog late, low-to-mid 60’s for overnight low temperatures

Sunday

Patchy fog early; otherwise, more clouds than sun, quite warm, rather humid, chance for a shower or thunderstorm, mid 80’s

Monday

Patchy fog possible early; otherwise, partly sunny skies, quite warm and humid, chance for showers and thunderstorms, mid 80’s

Tuesday

Partly sunny, quite warm and humid, chance for showers and thunderstorms, mid 80’s

Wednesday

Mainly sunny, breezy, noticeably cooler and less humid, low-to-mid 70’s

Discussion

A summer-like weekend is in store for the Mid-Atlantic region with warmth and noticeable humidity. The higher humidity values will have three effects on our weekend weather: 1) expect some clouds on each day 2) there will be a daily threat for a shower or thunderstorm and 3) patchy late night and early morning fog will likely form. By Monday, an approaching cool front will increase the odds for showers and thunderstorms and the summer-like warmth and humidity will persist. Cooler, less humid air should follow the frontal system by the middle of next week.

Elsewhere this weekend, while the Mid-Atlantic is warm and humid, the Rockies and Northern Plains will experience cold conditions and accumulating snow. The clash of cold air across the western US with the warm and humid air in the eastern US, will likely result in severe weather for the central Plains this weekend from Texas to Kansas. Meanwhile, Subtropical Storm Ana has formed off the southern Atlantic coast of the United States - a "home-grown" type of tropical storm - making it the first named tropical system of the 2015 Atlantic Hurricane Season (2015 Tropical Outlook: http://vencoreweather.com/2015/05/05/1000-am-2015-tropical-and-mid-atlantic-summertime-outlooks/).