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Posted at 5:00 AM ET, 02/21/2008

Forecast: Brief Calm Before Next Storm

By Josh Larson

Light snow likely tonight; wintry mix tomorrow

**Winter Storm Watch Thursday evening through Friday night**

On the heels of yesterday's quick-hitting storm that brought light snow to the area, we have another -- more complex -- storm system that threatens more snow for the region tonight, and the potential for a dreaded wintry mix tomorrow into early Saturday. The situation is an evolving one, and thus forecast confidence is only in the medium range. Confidence is high, however, that today's weather will be calm and cold.

TODAY

Sunny start, cloudy finish, mid 30s. We'll start the day with plenty of sunshine and chilly morning temperatures rising from the upper teens and 20s. Then, increasing clouds in the afternoon as low pressure approaches from the southwest. Highs in the mid 30s.

TONIGHT AND TOMORROW

Accumulating wintry mix likely. Skies will be overcast tonight with lows in the mid to upper 20s and light snow likely. Some accumulation is possible by morning. Snow is likely to mix with and change to sleet and freezing rain, from south to north, during the morning hours tomorrow. A changeover to plain rain or drizzle is possible (but by no means definite) for DC and areas south and east during the afternoon or evening. Temperatures in most places probably won't make it out of the low 30s. A wintry mix may continue Friday night, with temperatures nearly steady in the low 30s.

It's too early to pinpoint exact accumulations, but a couple inches of snow plus moderate icing is a decent possibility, especially in (but not necessarily limited to) the typically colder suburbs to the north and west.

Keep reading for the forecast through the weekend and a sneak peek at early next week. And check back later this morning for the latest on the approaching storm in the Snow Lover's Crystal Ball.

SATURDAY

Lingering snow or rain showers, cloudy, low 40s. Snow or rain showers may linger into Saturday, especially during the first half of the day. Clouds may also linger with highs in the low 40s. Expect partial clearing Saturday night, with lows from 25-30.

SUNDAY

Sunny, mid 40s. High pressure begins to build in on Sunday, allowing for mostly sunny skies and slightly milder highs in the mid 40s. Clear and cool on Sunday night with lows from the mid 20s in places like Reston and Damascus to near freezing downtown.

A LOOK AHEAD

Monday is expected to be mostly sunny with highs in the upper 40s. Partly cloudy and not as cold Monday night with lows from 30-35.

Low pressure approaching from the west could bring increasing clouds on Tuesday with a 50/50 shot of showers and afternoon highs near 50.

The weather on Wednesday will likely depend on how quickly Tuesday's storm clears out. Best guess for now is for a chance of showers early with some clearing late and highs in the 40s.

By Josh Larson  | February 21, 2008; 5:00 AM ET
Categories:  Forecasts  
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