High pressure, over Maine this morning, will continue to move slowly north and east into the Canadian Maritimes today. As this occurs, a storm system over the Mississippi Valley this morning will move toward the lower Great Lakes. As this low pressure area churns northward, a secondary area of low pressure is forecast to develop Tuesday evening over mid Atlantic states, and slowly move toward the lower Hudson Valley by Wednesday evening. Upper level energy associated with the complex storm will continue to provide the chances of light precipitation all the way through Thursday. The entire system is forecast to lift northward, and away from the region, by Friday.
Increasing clouds will be the weather feature through the day today across the Capital Region. Precipitation should commence during the evening hours tonight, and may start as some light snow thanks to evaporative cooling processes (the high pressure area in place having relatively ‘dried out’ the low levels of the atmosphere during the day today). As the secondary low pressure area develops, a strong southeasterly winds in the lower 5,000 feet of the atmosphere will drive warmer and increasingly more moisture laden air into the region. This should aid in changing the precipitation from any snowfall to more of a wintry mix, and then eventually to all rain as temperatures approach the 40 degree mark tomorrow afternoon.
Higher elevations will likely see more in the way of snowfall and mixed precipitation, thanks to temperatures remaining marginally near or just above freezing. In addition, those in the higher elevations may see some gusty winds at times. Precipitation and winds should slowly begin to slacken off Thursday morning, though residual rain and/or snow shower activity is likely to persist through the day (precipitation type most likely dependent on elevation).
High pressure over the center of the nation begins to slowly take control of our weather in time for the weekend.
...Below is the official forecast for the Capital Region and vicinity...
Today: Mostly sunny to start, with increasing afternoon clouds. High in the lower 40’s. Light and variable winds.
Tonight: Overcast with light snow developing. Snow may mix with sleet, freezing rain, and rain at times overnight. Low near 30. Southeast winds 5-10 MPH. Chance of precipitation is 90 percent. An inch or less of snow accumulation is expected.
Wednesday: A wintry mix of snow, sleet, freezing rain and rain likely during the morning. Precipitation changing over to light rain and areas of drizzle by afternoon. High in the lower 40’s. Southeast winds 5-15 MPH. Chance of precipitation is 100 percent. Snow accumulations of an inch or two with minor icing accumulations possible before the changeover to rain.
Wednesday Night: Overcast with areas of light rain and drizzle. Low in the lower 30’s. Northeast winds, shifting north at 5-10 MPH. Chance of rain is 50 percent.
Thursday: Overcast with light rain showers and areas of drizzle. High 40-45. Variable winds 5-10 MPH. Chance of rain is 50 percent.
Friday: Intervals of clouds and sunshine with a 30 percent chance of a rain and/or snow shower. High near 40 and low near 30.
Saturday: Intervals of clouds and sunshine and breezy. High near 40 and low near 25.
Sunday: Intervals of clouds and sunshine. High near 35 and low near 25.