11:30 a.m. update: The very cold air aloft has promoted quick cloud redevelopment, mainly right over our area, late this morning. Given that they’ve formed, it could take a while for them to dissipate. We should see at least breaks of sunshine but it’s certainly more cloudy than expected. Clouds should tend to wane as we lose daytime heating later today, if not prior.

From 5:00 a.m…

TODAY’S DAILY DIGIT
A somewhat subjective rating of the day’s weather, on a scale of 0 to 10.

6/10: A little too windy to really enjoy those December temps, but it’s good to know it can still be chilly.

EXPRESS FORECAST

Today: Mostly sunny, breezy. Highs: Near 40 to mid-40s.
Tonight: Mostly clear, chilly. Lows: 21-30.
Tomorrow: Mostly sunny, calmer. Highs: Mid-to-upper 40s.

FORECAST IN DETAIL

There was no mistaking the fact that December is back if you were out and about yesterday and last night. We do it again today in particular, but with perhaps a touch colder temperatures. In a December where warmth just won’t quit we already see signs of transition in another cool one tomorrow. As we head into the work week we’ll begin to wonder where winter is again, this time while it officially arrives.

Today (Saturday): A few spots may wake up to a light dusting of snow thanks to overnight snow showers that entered parts of the area. Some general cloudiness related to that activity could linger into the morning. If so, I think we end up rather sunny pretty quick. A few clouds may float by at times during the day but the main cloud-maker of yesterday is pushing off to the east, so we’re just left with really cold air aloft as a potential cloud source. The air here at the surface is quite chilled as well, with highs only in the near 40 to maybe mid-40 range. Winds peak around 15-20 mph during the midday and afternoon. Expect higher gusts and a noticeable wind chill. Confidence: Medium-High

Tonight: Gusty winds of the day should subside a good bit with sunset. We may not go totally calm, but it won’t be as windy as it has been. Add in clear skies plus dry air and we’ve got ideal conditions for letting any warmth near the ground readily escape into the atmosphere. It’s one of the coldest nights of the season. Lows should near 20 in the coldest suburbs well north and west to the mid-20s surrounding the Beltway. Upper 20s in D.C., or closer to 30 in the heart of downtown. Confidence: High

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Tomorrow (Sunday): This one is dominated by some small-scale high pressure out ahead of a weak cold front approaching for early week. With that, plan on skies being mostly sunny in the morning and probably into some of the afternoon before clouds may begin filtering in. Any clouds should mainly be high level and thin prior to sunset. It’s slightly milder than today as temperatures reach the mid-and-upper 40s. Winds are relatively light. Confidence: Medium-High

Tomorrow night: We may still be pretty clear during the evening. If that’s the case, clouds still increase overnight. It trends nearly fully cloudy by morning. Those clouds help keep temperatures up by acting as a blanket on lower-level “warmth.” Expect mainly upper 20s to mid-30s thanks to this help. Confidence: Medium-High

A LOOK AHEAD

It’s mostly cloudy for much of Monday as that weak front continues this way. We could see a few showers around as soon as the midday but it seems the best bet is for the most legitimate chance of showers to try to hold off till after dark. Highs make the near 50 to mid-50s zone. Maybe on the warm end if we manage more sun. At this point, any rain potential seems quite light even into the night, and it may mainly stay west. Confidence: Medium

The front pushes into and perhaps through the area for Tuesday. It’s getting held up by warm air building to the south and it’s also falling apart. But there are hints a wave of low pressure may try to form on it across the region. We saw that happen just a few days ago and it ended up a rainy time. For now, it seems rain tries to stay mainly south and east with highs around 60. But we’ll need to watch it. Confidence: Medium-Low