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Posted at 5:00 AM ET, 06/21/2008

Forecast: Summer Sun and Storms

By Jason Samenow

The first weekend of summer will deliver weather in keeping with the season. For the better part of both days, we'll have a mix of sun and clouds, warm temperatures and a touch of humidity. But a summer forecast isn't complete without a mention of thunderstorms. And those will be possible both weekend afternoons and evenings -- with the greatest risk and coverage on Sunday.


Radar: Latest mid-Atlantic radar loop from the National Weather Service. Click here to expand. Refresh page to update. What is UTC?

Partly to mostly cloudy. A few storms late. 84-88. With winds from the south today (at about 10 mph), it will be somewhat more humid than the past several. The added juice in the atmosphere may fuel scattered late afternoon or evening thunderstorms (30% chance), but quite a few places should stay mainly dry for outdoor activities. Temperatures will be seasonably warm, maxing out in the mid 80s.

Overnight, a 30% chance of showers and thunderstorms lingers, with most of the action probably east of the metro area. Temperatures drop down to near 70 in the city, mid 60s in the suburbs.

Confidence: Medium-High

Keep reading for the forecast for Sunday into early next week. See NatCast to find out your chances of staying dry at tonight's game.


Mostly cloudy, p.m. t'storms threaten. 82-86. Sunday will be a lot like Saturday, but with elevated humidity and thunderstorm chances. The best chance of storms will be late in the afternoon and into the evening (50% chance) as the cold front triggering the storms draws closer. A few storms could be on the strong side, with damaging winds and hail a possibility. Temperatures will reach at least the low 80s and, if we get enough sun, even the mid or upper 80s.

Overnight, a few storm may stick around through mid to late evening, with partly cloudy skies after midnight. Lows temperatures reach the mid to upper 60s.


As the cold front that triggered Sunday's storm is slow to pull away, a few storms remain possible on Monday (35% chance), especially east of the metro area. Otherwise, expect partly sunny skies with highs in the mid 80s. Confidence: Medium

High pressure builds into the region on Tuesday giving us mostly sunny skies, lower humidity and high temperatures in the mid 80s. Confidence: Medium-High

By Jason Samenow  | June 21, 2008; 5:00 AM ET
Categories:  Forecasts  
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What are the chances I will see rain in the Burtonsville MD area Sunday morning between 8:00 am and noon?


Posted by: Snowlover | June 21, 2008 5:15 AM | Report abuse

I'm about to go for a bike ride. What are the chances I will see rain in the next hour in 1900 Block of R Street, NW? And what will the temperature be there? Humidity?

Posted by: Snowhater | June 21, 2008 6:58 AM | Report abuse

Did anyone else get woken up by the thunderstorm overnight?

Posted by: alexandria | June 21, 2008 8:57 AM | Report abuse

Snowlover: Per our forecast, the best chance of storms area-wide is late tomorrow afternoon and evening. In the morning, storms are not all that likely (less than 20% chance).

Posted by: Jason, Capital Weather Gang | June 21, 2008 9:00 AM | Report abuse

yeah I was surprised to be woken up by the t'storm last night (Clarendon)

Posted by: jeffc | June 21, 2008 10:51 AM | Report abuse

Big issue: Impact of possible thunderstorms on this afternoon's (1PM--8PM) Columbia Pike Blues Festival. Things look just fine right now, but Sterling is mentioning a very high threat of thunderstorm activity later this afternoon. What's interesting is that all yesterday's forecasts were mentioning TOMORROW as the most likely rain-impacted period, not today.

jeffc,alexandria: I'm somewhat mystified about this Clarendon thunderstorm report for last night, as I live near Baileys Crossroads and can recall no thunderstorm activity overnight. I was at a dance at the Fairfax Elks Lodge until midnight and awake until nearly 2 AM. Is it possible I slept through it all? Normally overnight thunderstorm activity wakes me up or keeps me awake. I remember one particularly notable event while staying with a cousin in San Diego in Aug., 1991. Normally there's absolutely no thunderstorm activity in San Diego during the late summer. However I recall the overnight summer thunderstorms of western Wisconsin quite vividly, and should have recorded one last night at my home. Perhaps I slept through it if it was around 3-4 AM. Overnight thunderstorms are rather rare around here, less so than in the upper Great Lakes.

Posted by: El Bombo | June 21, 2008 11:16 AM | Report abuse

El Bombo, National reported a thunderstorm at 2 and 3 am obs. Wunderground has a nice little archive of radar for the whole day, but you may need to be a member to see it.

T-storm/rain threat 1 to 8... should mostly be scattered activity by late in that period (5-8?). Some storminess west of here to watch.. severe storm warning out for NW VA.

Posted by: Ian, Capital Weather Gang | June 21, 2008 2:30 PM | Report abuse

There is a DC United match at RFK Sunday afternoon.

Of course there will be rain and thunderstorms.

The weather hates soccer.

Posted by: seahawkdad | June 21, 2008 9:41 PM | Report abuse

you people are idiots

Posted by: gg44 | June 22, 2008 5:00 AM | Report abuse

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