Summary of Flooding of March 10th-13th, 2011
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Summary of Flooding of March 10th-13th, 2011
A widespread 2 to 3 inches of rainfall occured on March 10th through March 11th, 2011. The rain (and some snow) was due to a very slow-moving front that nearly stalled over the Upper Ohio Valley and Mid-Atlantic States.

River levels were already running high before the rain moved in.

The southerly winds in advance of the front brought very mild temperatures and moist air up from the south. This warm, moist air melted a great deal of water out from the snow pack that was already in place. In some spots over the higher terrain of PA and Upstate New York, 2 to 6 inches of water was waiting to melt out of a very dense snow cover before the warm-up began. The result of the warming was a rapid snow melt.

The snow melt and heavy rainfall combined to create flooding on a wide scale in the Allegheny and Susquehanna River Basins.

Rainfall (liquid precipitation) from March 7th through 14th
Rainfall (liquid precipitation) from March 7th through 14th

Departure From Normal Precipitation from March 7th through 14th
Departure From Normal Precipitation from March 7th through 14th

Surface Map of March 10th, 2011
Surface Map of March 10th, 2011

Water Contained in Snow on Ground, March 9th, 2011
Water Contained in Snow on Ground, March 9th, 2011

Maximum Temperature Map of March 10th, 2011
Maximum Temperature Map for Daytime of March 10th, 2011 - Note upper 40s and lower 50s over PA

Bloomsburg River Gauge Trace (Stage in Feet) March 6th-15th
Bloomsburg River Gauge Trace (Stage in Feet) March 6th-15th

Camp Hill River Gauge Trace (Stage in Feet) March 6th-15th
Camp Hill River Gauge Trace (Stage in Feet) March 6th-15th

Harrisburg River Gauge Trace (Stage in Feet) March 6th-15th
Harrisburg River Gauge Trace (Stage in Feet) March 6th-15th

Harper Tavern River Gauge Trace (Stage in Feet) March 6th-15th
Harper Tavern River Gauge Trace (Stage in Feet) March 6th-15th

Williamsburg River Gauge Trace (Stage in Feet) March 6th-15th
Williamsburg River Gauge Trace (Stage in Feet) March 6th-15th


 
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Page Last Modified: 15 March 2011 18:16:20 UTC
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