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Washington DC weather update: Winter Storm Watch for Sunday night into Monday

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Brian's exclusive forecast for Washington DC:

Tonight: Mostly clear and turning colder with a low in the mid 30s.

Sunday: Increasing clouds with afternoon rain showers. Colder with a high in the lower 40s.

Sunday Night: Rain changing to snow. The low will be around 30. Snow may accumulate 1 to 2 inches by morning.

Monday: Snow tapering to flurries during the afternoon. Total snow accumulation 2 to 4 inches. The high will be near 35.

The extended forecast calls for a chance of snow showers on Tuesday with a low in the upper 20s and a high in the upper 30s. Variable cloudiness with a few showers on Wednesday and Thursday with a low around 40 and a high near 55 each day.

The National Weather Service has issued a Winter Storm Watch effective Sunday afternoon through Monday afternoon. Highs today approached 70 degrees in Baltimore & Washington, but a late-season winter storm will impact the Middle Atlantic states by late Sunday night with accumulating snow. Although the air felt like spring today, it was rather windy in the wake of a weak cold front that moved through the area. Tonight, high pressure will build down from Canada and will cause the mercury to drop 35 degrees from Saturday's highs. At the same time, an area of low pressure will develop to our southwest and track toward eastern North Carolina. Precipitation from this low will override cold, dry air at the surface and produce afternoon and evening rain showers on Sunday that will mix with, and change to snow by midnight. A developing area of low pressure will increase the feed of moisture and produce accumulating snow through early Monday. Although the exact track of the storm is still uncertain, we do know that the center of low pressure will move to our south and exit off of the North Carolina coast. This will ensure that Baltimore and Washington are on the cold side of the storm. In fact, temperatures will likely be in the mid and upper 20s on Monday morning. Consequently, any snow that falls will accumulate quickly even on paved surfaces and roads. At this time, a snowfall accumulation of 2 to 4 inches can be expected in Washington and Annapolis with 1 to 2 inches in Baltimore. Localized heavier amounts may exceed this forecast by 1 to 2 inches. Snow is expected to taper to flurries by late morning, although temperatures may not rise above freezing all day.

On the Maryland portion of Chesapeake Bay, a Small Craft Advisory is in effect through late Sunday night. Winds tonight will come out of the north at 10 knots with waves from 1 to 2 feet. Winds on Sunday will come out of the north at 10 knots with waves from 1 to 2 feet. Visibility may be reduced in rain and fog on Sunday afternoon. Winds on Sunday night will come out of the northeast at 10 to 15 knots with gusts over 20 knots and waves from 1 to 3 feet. Visibility may be reduced in rain, snow, and fog. Winds on Monday will come out of the northeast at 10 to 15 knots with gusts over 25 knots and waves from 2 to 4 feet. Visibility may be reduced in snow and fog. Marine information is provided only as a guide. Boaters should always stay tuned to the latest forecasts and advisories from the National Weather Service.

Click here for the average March lows and highs for Baltimore. Click here for the average March lows and highs for Washington DC. Click here for the sunrise and sunset times. For more weather updates, please visit my web site, my Chesapeake Bay Weather page on Facebook, and if you're heading to Ocean City feel free to check out my Ocean City MD Weather page on Facebook. You can also follow me on Twitter @chesbayweather.