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Workweek: Somewhat Cloudy and Cool is the Rule
Sunnier, warmer weather on horizon for weekend

Dan Stillman @ 8:30 AM

** Severe Thunderstorm Watch in Effect Until 9 PM **

The pattern that gave us yesterday's unusual "backward-moving" storms, as explained by Steve in yesterday afternoon's Nowcast, is poised to keep us on the somewhat cooler, cloudier side of things through at least tomorrow, with the potential for more storms this afternoon and tonight. More typical summer weather is expected to return for the weekend.

Pictured: GFS forecast model prediction for this afternoon shows onshore flow for the MidAtlantic region on the back side of low pressure parked off the coast (barbs point in the direction the wind is coming from). Courtesy NCEP.


Forecast Confidence: Medium-HighIncreasing clouds, chance of showers and t-storms. A slow-to-move low pressure systems continues to sit off the coast. On the back side of it, flow out of the northeast will give us a partly to mostly cloudy afternoon after a partly sunny morning. Highs should reach the upper 70s to near 80 with a 50% chance of scattered showers and thunderstorms during the afternoon and evening. Tonight, we keep the chance of showers and thunderstorms as lows drop to the upper 50s to low 60s.


Forecast Confidence: MediumCloudy, cooler. Onshore flow keeps us partly to mostly cloudy and cool. It looks like highs will only make it to the low 70s, with the odds of scattered showers at 25%. Overnight, partly cloudy with a slight chance of a shower, lows in the upper 50s to near 60.


Forecast Confidence: Low-MediumIn the clear? Weak high pressure will try to suppress shower activity and give us a little more in the way of sun. But it's uncertain how successful the high pressure will be at doing either. My best guess for now is a partly sunny day with highs in the mid 70s and a 25% chance of scattered showers, mainly in the afternoon. Overnight, partly cloudy with a slight chance of a shower and lows in the upper 50s to low 60s.

The Weekend

Forecast Confidence: Medium-HighSunnier, warmer. Southerly flow should warm temperatures for Saturday, with partly sunny skies and highs in the low-to-mid 80s. Saturday night, some clouds may work their way into the picture ahead of a cold front as lows dip to the mid-to-upper 60s. Sunday also looks partly sunny but with increasing humidity. Indications are that temperatures could surge to highs near 90 ahead of the front, which could trigger a chance of late-day isolated or scattered showers and thunderstorms.

Environmentally Friendly Filmfest reports that the Silverdocs film festival in Silver Spring "will use wind-generated electricity for the entire run, making it what organizers call the country's first carbon-neutral documentary festival." On top of that, the festival's Web site boasts "a low-watt web color palette in order to reduce energy consumption when displayed by computer monitors" -- now that's hard core. The film festival runs June 12-17.


The Washington Post profiles a day in the stressful life of airline forecaster Mark Mabey.

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