D.C. area forecast: Calm Friday, then a break in the “no weather” pattern

September 20, 2013

Today’s Daily Digit

A somewhat subjective rating of the days weather, on a scale of 1 to 10.

10
Knowing you all like it a bit warmer than I might, I easily found +1 for Friday to keep up our “perfect” streak!

Express Forecast

Today: Warm but refreshing. Highs: Around 80 to low 80s.

Tonight: Clouds increase. Lows: Upper 50s to Mid-60s.

Tomorrow: Mainly cloudy, periodic showers and t’showers possible. Highs: Mid-to-upper 70s.

Sunday: Mostly cloudy, shower possible early. Clearing late. Highs: Mid-to-upper 70s.

FORECAST IN DETAIL

While the getting is good, enjoy today and even Sunday. We don’t have a clear-cut weekend ahead, but it shouldn’t be the worst one ever either. Temperatures remain pleasant, and humidity only ticks up slightly during Saturday. I think we can make the most of it. Aren’t we all agreed we could use some rain, though?

Today (Friday): The sun wins the battle over smatterings of periodic patches of clouds. Temperatures around 80 seem very likely, with a few lower 80s possible, especially south of town. Enjoy continued non-muggy air, with a light southerly breeze periodically refreshing you at 5-10 mph. Confidence: High

Tonight: Fair and mainly clear, until some clouds move in closer toward sunrise thanks to a front approaching from the Midwest. Low temperatures fall just into the mid-60s downtown (assuming solid cloud cover before sunrise), and upper 50s outside the Beltway. Light 5-10 mph breezes continue from the south. There could be a light passing shower nearer sunrise but I wouldn’t plan on it. Confidence: Medium-High

For related traffic news, check out Dr. Gridlock. Keep reading for the forecast through the weekend…

Tomorrow (Saturday): Clouds fully takeover during the day, if not already by sunrise. High temperatures in the mid-70s appear likely. Extra sun could get some spots to the upper 70s. But it is appearing likely (60% chance) that the day, particularly afternoon and onward, could be riddled with periodic rain showers. Even some late-season thunder is possible. We could see a decent bit of rain, but not quite confident to throw out amounts at this point as per potential hit or miss nature and such. South winds are around 10-15 mph. Confidence: Medium

Tomorrow night: The shower threat persists (60% chance) into the night as the front moves through the region. Some timing differences out there, so it could end early in the fastest scenario. Low temperatures cool into the 50s for many, but perhaps around 60 is as cool as we can get downtown. We’ll need the cooling assistance of northwesterly breezes behind the cold front, kicking up to 10-15 mph, drying us out around sunrise. Confidence: Low-Medium

Sunday: Our first taste of astronomical fall (4:45 p.m. locally) may display some morning sunshine for us, but clouds could also move back into the picture. It looks more and more like rain risks should be ending by morning, but for now I’ll keep a slight risk of it persisting (30% odds). Otherwise, skies trend clearer and we try to salvage the day. High temperatures should still manage the mid-to-upper 70s. Confidence: Low-Medium

A LOOK AHEAD

Sunday night: Could be fairly dry, despite still substantial cloud cover. For now, I want to keep a 10% chance of a shower mentioned just in case. Low temperatures may range from the mid-50s to around 60. Confidence: Low-Medium

Let’s call Monday partly sunny for now, but because we may still have a stationary front nearby to the south, I don’t want to totally avert my eyes from any tropical feed that might try to set up into it. In other words, it’s perhaps not a “safe” dry day. High temperatures are mainly in the low-to-mid 70s. Confidence: Low

Tuesday assumes any tropical moisture continues to ignore us with the frontal zone perhaps shifting even further east. That being the assumption, it looks even sunnier and nicer. High temperatures in the mid-70s appear likely!  Confidence: Low

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A. Camden Walker · September 20, 2013