High pressure will build into the region today, clearing the skies for at least the first half of the day. Clouds will begin to slowly increase this afternoon, and thicken during the evening hours as a combination of weather systems approaches the region. One system driving a cold front southward through the upper Great Lakes, and another lifting briskly northeastward from the Texas Gulf coast. The Gulf coast system will become the primary system through the day today, and lift northeastward toward the southern Appalachians.
Coastal low pressure will be induced along the mid Atlantic coast overnight tonight and early Wednesday morning. Ample moisture will be pumped northward along a coastal boundary, and will be further enhanced by the presence of an inverted trough of low pressure extending northward, from the southern Appalachian ‘parent’ low pressure system. The end result will be a prolonged period of moderate to heavy snowfall beginning overnight tonight, and lasting through the morning hours on Wednesday. Conditions should slowly improve by Wednesday afternoon, as the coastal low becomes dominant, and accelerates rapidly into the northeastern Atlantic and Canadian Maritime provinces.
High pressure, with origins over western Canada, will slide southeastward, and build into the region, bringing a couple days of fair, dry, and cold weather to the region to close out the work week and begin the weekend. Temperatures will dip back below normal through this period.
...Below is the official forecast for the Capital Region and vicinity...
**National Weather Service WINTER STORM WARNING In Effect From Midnight to 6 PM EST Wednesday**
Today: Mostly sunny to start, with increasing high clouds late in the day. High 30-35. Northwest winds 5-10 MPH.
Tonight: Increasing, thickening, and lowering clouds. Snow developing late in the evening. Snow may be heavy at times after midnight. Low in the lower 20’s. Light northerly to northeasterly winds. Chance of snow is 100 percent. Snow accumulations of 3 to 6 inches possible by dawn.
Wednesday: Snow, heavy at times during the morning, diminishing to flurries and snow showers by afternoon. High near 30. Northerly winds 5-10 MPH. Chance of snow is 100 percent. Total snow accumulations of 6 to 12 inches.
Wednesday Night: Left over evening flurries ending quickly. Decreasing clouds and cold. Low 10-15. Northwest winds 5-10 MPH.
Thursday: Mostly sunny. High near 25. Northwest winds 5-10 MPH.
Friday: Mostly sunny. High near 25 and low near 5 above zero.
Saturday: Mostly sunny. High near 25 and low near 5 above zero.
Sunday: Increasing clouds with a 30 percent chance of light snow. High near 30 and low near 15.
Monday: Mostly cloudy with a 30 percent chance of light snow. High near 25 and low near 10.