Surface high pressure was in place over the northeastern United States during the overnight hours of February 19th. At the same time, low pressure was tracking northeastward from the south central US. Strong warm air advection and associated frontogenetical forcing led to a period of moderate to heavy snow that spread northeastward across the state of Maryland, especially along and northwest of Interstate 95, on the morning of February 20th. As warmer air continued to move in aloft, precipitation then transitioned over to sleet and then freezing rain during the afternoon hours. By later that evening, the primary low was moving through the Great Lakes region as a secondary low moved along the Mid-Atlantic coastline. Eventually enough warm air moved into the region, changing all precipitation over to rain during the overnight hours on the 20th.

Winter Weather in CALVERT, MARYLAND
From 20-FEB-19 05:00:00 to 20-FEB-19 13:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 1 to 1.5 inches were observed across Calvert County.

Winter Weather in NORTHWEST HARFORD, MARYLAND
From 20-FEB-19 07:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 3 to 4 inches were observed across northwest Harford County, with 3.0 inches reported near Scarboro. A tenth to two tenths of an inch of ice accumulation was also reported.

Winter Weather in PRINCE GEORGES, MARYLAND
From 20-FEB-19 07:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 2 to 5 inches were observed across Prince Georges County, with 4.9 inches reported near Savage. A few hundredths of an inch of ice accumulation was also reported.

Winter Storm in WASHINGTON, MARYLAND
From 20-FEB-19 05:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 3 to 7 inches were observed across Washington County, with 6.8 inches reported near Hancock. A few hundredths to a tenth of an inch of ice accumulation was also reported.

Winter Storm in FREDERICK, MARYLAND
From 20-FEB-19 07:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 4 to 7 inches were observed across Frederick County, with a local maximum of 7.5 inches measured near Sabillasville. A few hundredths to a tenth of an inch of ice accumulation was also reported, with a local maximum of a quarter of an inch reported near Thurmont.

Winter Storm in CARROLL, MARYLAND
From 20-FEB-19 07:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 3 to 6 inches were observed across Carroll County, with a maximum of 6.2 inches measured near Gamber. A few hundredths to a tenth of an inch of ice accumulation was also reported.

Winter Storm in NORTHWEST MONTGOMERY, MARYLAND
From 20-FEB-19 07:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 4 to 6 inches were observed across northwest Montgomery County, with a maximum of 6.1 inches measured near Germantown. A few hundredths of an inch of ice accumulation was also reported.

Winter Storm in CENTRAL AND SOUTHEAST MONTGOMERY, MARYLAND
From 20-FEB-19 07:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 4 to 5 inches were observed across central and southeast Montgomery County, with a maximum of 5.2 inches measured near Rockville. A few hundredths of an inch of ice accumulation was also reported.

Winter Storm in NORTHWEST HOWARD, MARYLAND
From 20-FEB-19 07:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 4 to 5 inches were observed across northwest Howard County, with 4.7 inches measured near Roxbury Mills. A few hundredths to a tenth of an inch of ice accumulation was also reported.

Winter Storm in CENTRAL AND SOUTHEAST HOWARD, MARYLAND
From 20-FEB-19 07:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 4 to 6 inches were observed across central and southeast Howard County, with 5.7 inches measured near Simpsonville. A few hundredths of an inch of ice accumulation was also reported.

Winter Storm in SOUTHERN BALTIMORE, MARYLAND
From 20-FEB-19 07:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 4 to 5 inches were observed across southern Baltimore County, with a maximum of 5.3 inches measured near Middle River. A few hundredths of an inch of ice accumulation was also reported.

Winter Storm in NORTHERN BALTIMORE, MARYLAND
From 20-FEB-19 07:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 4 to 5 inches were observed across northern Baltimore County, with 4.5 inches measured near Bentley Springs. A few hundredths to a tenth of an inch of ice accumulation was also reported.

Winter Weather in CHARLES, MARYLAND
From 20-FEB-19 05:00:00 to 20-FEB-19 13:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 1 to 2 inches were observed across Charles County.

Winter Weather in ST. MARY'S, MARYLAND
From 20-FEB-19 05:00:00 to 20-FEB-19 13:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 1 to 1.5 inches were observed across St. Mary's County.

Winter Storm in EXTREME WESTERN ALLEGANY, MARYLAND
From 20-FEB-19 05:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 6 to 7 inches were observed across western Allegany County, with 6.5 inches reported near Frostburg. A tenth to two-tenths of an inch of ice accumulation was also reported.

Winter Storm in CENTRAL AND EASTERN ALLEGANY, MARYLAND
From 20-FEB-19 05:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 6 to 8 inches were observed across central and eastern Allegany County, with 7.5 inches reported near Cumberland. Around a tenth of an inch of ice accumulation was also reported.

Winter Weather in SOUTHEAST HARFORD, MARYLAND
From 20-FEB-19 07:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 3 to 4 inches were observed across northwest Harford County, with a maximum of 4.3 inches reported near Fallston. A few hundredths of an inch of ice accumulation was also reported.

Winter Weather in ANNE ARUNDEL, MARYLAND
From 20-FEB-19 07:00:00 to 20-FEB-19 23:59:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts of 2 to 5 inches were observed across Anne Arundel County, with a maximum of 5.0 inches reported near Severn. A few hundredths of an inch of ice accumulation was also reported.