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Spring Flooding & Snow
April 2nd-5th, 2005

On April 2nd and 3rd, 2005, an unusually strong spring storm brought heavy snow to the high terrain of West-Central PA, and flooding rains to the east and south-central counties. The rainfall came on the heels of another significant rainfall just a few days prior (on the 28th and 29th of March) , which produced minor flooding on it's own. The already swollen rivers had little time to receed, and were easily pushed back up to flood levels by the rainfall on the 2nd and 3rd.

2 day precipitation (liquid) totals (7am 4/2 thru 7am 4/4/2005):
2 day rainfall total

2 day snowfall totals (from NWS Co-Op Observing Sites and spotter/public reports - 7am 4/2 thru 7am 4/4/2005):
2 day snow total

Although the heavy, wet snowfall in the west was fantastic, the flooding that the rains produced rivaled the flooding that occurred in Hurricane Ivan (Sep 2004), which were some of the all-time highest stages ever recorded!
The resultant river stages at a few locations can be seen below (in hydrograph format):

River Flooding

Hydrographs of points that went into flood during this rainfall
Please mouse-over the name of the River/Gage Point to change the picture below:

Main Stem Susq R.:
Susquehanna River at Bloomsburg
Susquehanna River at Danville
Susquehanna River at Sunbury
Susquehanna River at Harrisburg
Susquehanna River at Marietta
West Branch Susq R.:
Susquehanna River at Willimasport
Susquehanna River at Milton
Susquehanna River at Lewisburg
Swatara Creek:
Swatara Creek at Harper Tavern (site had telemetry problems)
Swatara Creek near Hershey
Other Susq. Tributaries:
Penns Creek at Penns Creek (see interesting double crest in second event)
Aughwick Creek at Shirleysburg
Sherman Creek at Shermans Dale (note the rapid response in second event)
Conodoguinet Creek near Hogestown
Yellow Breeches Creek near Camp Hill (note double crest in second event here also)
Conestoga Creek at Lancaster (not enough rain to flood either time - growing vegetation?)
Other Rivers in Central PA:
Tioga River at Mansfield
Youghiogheny River at Confluence (note that the snowfall in the Allegheny Mts kept this point from flooding twice!)

Other flood events:
Write up for Hurricane Ivan (Mid Sep 2004).
Write up for Hurricane Jeanne (Late Sep 2004).
Write up for the 30th Anniversary of Agnes (1972).
Write up for the 25th Anniversary of the 1977 Johnstown Flood.


 
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NOAA National Weather Service
Central Pennsylvania Weather Forecast Office
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State College, Pennsylvania 16803
(814)231-2408
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Page Last Modified: 25 March 2006 22:45:24 UTC
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