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BOOM! Thunder-snow and Up to 18 Inches on the Way

The snowfall totals vary sharply across Maryland by county. Find the forecast for your area.

Maryland will see from 5 to 18 inches of snow by Friday morning, according to forecasts. File|Patch
Maryland will see from 5 to 18 inches of snow by Friday morning, according to forecasts. File|Patch

If the forecasts are right, some parts of Maryland will be digging out from under a foot and a half of snow by Friday morning as Old Man Winter continues to hammer the Mid-Atlantic region.

Some areas could receive “thundersnow” – when you’ll hear thunder while it dumps snow -- while other parts of the state will see lesser amounts of snow and sleet.

The National Weather Service has issued a Winter Storm Warning for heavy snow and sleet, which is in effect from 8 p.m. tonight to 3 p.m. EST Thursday across Maryland.

Carroll County’s forecast adds up to 18 inches of snow, while Prince George’s County could see only 5 to 8 inches by the time the storm wraps up on Thursday night. 

Thundersnow — when thunder and lightning occur during a snowstorm — is most likely to happen during late winter or early spring when a mass of cold air meets warm, most air near the ground. According to Mother Nature Network, it’s a rare phenomenon.

Here’s a county-by-county forecast, from The Weather Channel.

Anne Arundel County

Windy with snow showers this evening. A steady, sometimes heavy, snow is likely after midnight. Some sleet may mix in. Low 27 degrees. Winds NNE at 20 to 30 mph. Snow accumulating 4 to 6 inches.

On Thursday expect a wintry mix of snow and rain in the morning, changing to snow, high around 35. Cloudy with rain and snow in the evening, another 1 to 2 inches of snow expected. 

Baltimore County

Scattered snow showers will transition to a steadier and heavier snow late. Some sleet may mix in. Low 24 degrees. Winds NNE at 15 to 25 mph. Snow accumulating 5 to 8 inches.

On Thursday look for periods of rain and snow with a high of 36. 1 to 3 inches of snow expected. Rain and snow in the evening. Low 26 degrees. Snowfall around one inch. 

Harford County

Scattered snow showers will transition to a steadier and heavier snow late. Low 21 degrees. Snow accumulating 5 to 8 inches.

On Thursday, the forecast calls fo another 3 to 5 inches of wet snow during the afternoon. High 34 degrees. Expect rain and snow in Thursday evening, with another 1 to 2 inches falling. Look for a low of 24. 

Carroll County

Cloudy with scattered snow showers Wednesday evening and a heavier steady snow likely after midnight. Low 21. 4 to 6 inches of snow expected.

Heavy snow continues on Thursday, with another 5 to 8 inches expected during the day. High of 34 degrees. Snow in the evening will bring another 1 to 3 inches of snow.

Howard County

Snow showers early Wednesday night will transition to a steadier, sometimes heavy, snow of up to 5 to 8 inches. Low 24.

Thursday, snow in the morning will mix with rain at times in the afternoon, accumulating 3 to 5 inches. Expect a high of 36 degrees. Periods of rain and snow taper off Thursday night, snowfall around one inch.

Prince George’s County

Expect steady, sometimes heavy, snow Wednesday night, with some sleet mixed in. Low 26 with temps rising to near freezing. Snowfall of 5 to 8 inches of expected.

Thursday’s forecast expeccts a wintry mix in the morning changing to rain, mixed with snow in the afternoon. High 36. A mixture of rain and snow is predicted in the evening, about one inch of snow predicted.

Montgomery County

Expect steady, sometimes heavy, snow Wednesday night. Low 25. Snowfall of 5 to 8 inches of expected.

Snow during the morning on Thursday will mix with rain at times during the afternoon. High around 35 degrees. Expect another 4 to 6 inches of snow. Snow will end in the evening with about one inch of additional snow likely.

Precautionary/preparedness actions.

A Winter Storm Warning for heavy snow means severe winter weather conditions are expected or occurring. Significant amounts of snow are forecast that will make travel dangerous. Only travel in an emergency.

If you must travel keep an extra flashlight food, water, in your vehicle in case of an emergency.

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