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Posted at 11:00 AM ET, 02/20/2008

Update: Light Snowfall Still On Track

Another storm could bring late-week wintry mix

**Snow Advisory in effect for metro area from 11 a.m. to 10 p.m. today**

Snow is on schedule to move into the DC area from west to east during the next few hours, and is expected to continue through the afternoon, ending by early evening. With temperatures holding mainly in the low 30s, accumulations of a dusting to 1" are likely across the DC area. Some places could receive a little bit more, up to about 2", especially if snow becomes moderate to heavy at times. Downtown, slightly warmer temperatures may limit accumulation on paved surfaces.

While no ice is forecast to fall from this storm, slick spots and poor traction are a concern for the commute home. Check back this afternoon for our CommuteCast.

See Dan's post for the forecast for tonight's lunar eclipse and through the weekend, including a chance for an accumulating wintry mix Thursday night into early Saturday. For additional details on the late-week wintry weather, see the Snow Lover's Crystal Ball below.

Next Chance of Accumulating Snow: Thursday Night through Saturday Morning
Probability: 50%
Potential Impact:

With a cold air mass in place, a complex storm system involving two areas of low pressure will approach from the south and southwest late Thursday. The storm may come in two separate waves of precipitation with a lull in between. While precipitation may start out as snow for much of the metro area Thursday night, a variety of precipitation will likely fall across the region by the time the storm exits, probably by early Saturday.

This is a much trickier storm to forecast than today's. Here's our best guess on timing and accumulation potential ...

Light to moderate snow could spread over the area Thursday night, lasting into the morning with some accumulation possible. During the day on Friday, as warmer air moves in from the south at the upper levels of the atmosphere while cold air holds strong at the surface, sleet and freezing rain will likely begin to mix in with the snow from southeast to northwest.

It's too early to pinpoint the timing and extent of the changeover in precipitation, but there is potential for significant snow and/or ice accumulations in areas that remain at or below freezing at the surface. Precipitation should taper by late Friday evening into early Saturday morning.

While this storm may not bring major amounts of snow, it is still a tricky, long-duration event that could have a moderate impact on the region, especially in areas that experience freezing rain. Total accumulations on the order of a few inches are certainly possible. And there's the potential for several inches if the timing of changeover from snow to ice takes longer than currently anticipated.

By  |  11:00 AM ET, 02/20/2008

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