Low pressure passed over the Great Lakes and up the Saint Lawrence River valley from February 22 into February 23, 2021, pushing a warm front and cold front across central Pennsylvania. A narrow, north-south stripe of heavy snow (1-2 per hour) associated with the warm front passed over the Susquehanna Valley during the morning rush hour, and the heavy snowfall rates combined with the potential for a flash freeze prompted the issuance of snow squall warnings.

Winter Weather in NORTHUMBERLAND, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in Northumberland County.

Winter Weather in LANCASTER, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in northwestern Lancaster County.

Winter Weather in SNYDER, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in eastern Synder County.

Winter Weather in COLUMBIA, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in Columbia County.

Winter Weather in UNION, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in Union County.

Winter Weather in SCHUYLKILL, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in Schuylkill County.

Winter Weather in MONTOUR, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in Montour County.

Winter Weather in LANCASTER, PENNSYLVANIA
From 22-FEB-21 08:28:00 to 22-FEB-21 09:15:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in Lancaster County.

Winter Weather in CUMBERLAND, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in eastern Cumberland County.

Winter Weather in PERRY, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in northeastern Perry County.

Winter Weather in YORK, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in northwestern York County.

Winter Weather in NORTHERN LYCOMING, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in northern Lycoming County.

Winter Weather in SOUTHERN LYCOMING, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in southern Lycoming County.

Winter Weather in SULLIVAN, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in Sullivan County.

Winter Weather in LEBANON, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in Lebanon County.

Winter Weather in ADAMS, PENNSYLVANIA
From 22-FEB-21 08:28:00 to 22-FEB-21 09:15:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in southeastern Adams County.

Winter Weather in DAUPHIN, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in Dauphin County.

Winter Weather in TIOGA, PENNSYLVANIA
From 22-FEB-21 08:15:00 to 22-FEB-21 09:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in southeastern Tioga County.

Winter Weather in YORK, PENNSYLVANIA
From 22-FEB-21 08:28:00 to 22-FEB-21 09:15:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

SNOW SQUALL. A snow squall on the leading edge of a mesoscale band of heavy snow briefly dropped visibility to under one quarter mile in and produced flash-freeze conditions in York County.