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Chesapeake Bay weather for February 13: Evening snow, then sunny on Friday

National Weather Service forecast map
National Weather Service forecast map
Map courtesy National Weather Service

Brian's exclusive forecast for Baltimore, Annapolis, and northern Delmarva:

*The National Weather Service has issued a Winter Weather Advisory for tonight*

Overnight: Snow accumulating 2 to 4 inches, then mostly cloudy. Low around 30.

Friday: Morning cloudiness giving way to a mostly sunny sky. The high will be in the mid to upper 30s.

Friday Night: Cloudy with a chance of snow showers. The low will be in the upper 20s.

Saturday: Morning snow showers, then partial afternoon clearing. The high will be in the mid 30s.

The extended forecast calls for sunny but cold conditions on Sunday with a low around 18 and a high near 32. Mostly sunny on Monday with a low around 15 and a high near 38. Clouds and sun on Tuesday with a low around 28 and a high near 42.

A powerful winter storm has produced a significant accumulation of snow to the north and west of Baltimore and Washington where final snowfall tallies may exceed 20 inches. Closer to Annapolis, about 6 to 8 inches fell overnight before changing to sleet around 4 a.m. Sleet eventually changed to plain rain during the day and continued throughout the day except for a brief lull in the storm during the late morning and early afternoon hours. Precipitation began toward sunset in the form of rain that eventually transitioned back to sleet, and then to snow during the evening hours. This upper-low will continue to produce a swath of snow in the Annapolis area through midnight with accumulations between 2 and 4 inches possible. As the storm system begins to pull away from the region overnight, snowfall will come to an end and be followed by a mostly cloudy sky through the early morning hours on Friday. We will see the sun again on Friday with temperatures breaking above the freezing point. Meanwhile, an upper-air disturbance will move across the region late Friday night into Saturday morning with the potential to produce one to three inches of additional snowfall across the region. The upcoming weekend will be cold with sunshine by Saturday afternoon, continuing into Sunday. Highs each day will barely climb above freezing with lows in the teens. After this weekend, a warming trend begins and the pattern is expected to change. Temperatures will rebound into the 40s next week, which is closer to seasonal averages. The long-range outlook indicates a possible return to cold and stormy weather after the upcoming "February thaw."

On the Maryland portion of Chesapeake Bay, a Gale Warning is in effect until 6 a.m. on Friday. A Small Craft Advisory is in effect from 6 a.m. Friday through Friday afternoon. Winds tonight will come out of the west at 20 knots with gusts over 30 knots and waves from 2 to 4 feet, subsiding late. Visibility may be reduced in snow, sleet, and fog. Winds on Friday will come out of the southwest at 10 to 15 knots with gusts over 25 knots and waves from 1 to 3 feet. Winds on Friday night will come out of the northeast around 10 knots with waves around one foot. Visibility may be reduced in snow and fog. Winds on Saturday will come out of the northwest at 10 to 20 knots with gusts over 30 knots and waves from 1 to 3 feet. Visibility may be reduced early in snow and fog. Boaters should prepare for icy conditions on the bay. Marine information is provided as general guidance. Boaters should always stay tuned to the latest forecasts and advisories from the National Weather Service.

The average high temperature for February 13 is 44 degrees and the average low is 26 degrees. The records at Baltimore on this date are 72 degrees in 1951 and 1 degree in 1983. Today's sunrise will occur at 7:01 and the sunset will occur at 5:41. Weather data courtesy of the National Weather Service. For more weather updates, please visit 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.