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October 8th, 2005 - Flooding associated with Cold Front interacting with remnants of Tropical Storm Tammy


A cold front approached Pennsylvania from the northwest on Friday, the 7th of October, while a plume of deep tropical moisture flowed up into the mid-atlantic from the east. This tropical moisture and the circulation that accompanied it were the remnants of once-Tropical Storm Tammy.

Infrared Sat Pic from the 7th, with cold front overlaid.  TS Tammy remnants over GA/SC.
Infrared Sat Pic from the 7th, with cold front overlaid. (Former) TS Tammy circulation over GA/SC.

Heavy rain was the result. Amounts approached or exceeded 6 inches in places to the east of the Susquehanna River, with the heaviest totals near Lancaster, PA - as a widespread 8 to 12 inches of rain fell there. The rest of Central PA had 2-5 inches of rain. (See pictures below).

Generally, only Minor Flooding of smaller creeks and streams happened, as the area had been very dry for the entire summer. The dry antecedent conditions helped to keep the flooding from becoming worse in most areas. However, Major Flooding occurred in Lancaster County, where many roads were closed due to high water for as much as an entire day, and many homes and businesses had water damage.

Images of Rainfall and Precipitation Reports

Radar Reflectivity Mosaic from 1124 am EDT (1524 UTC) showing heavy rain in Eastern PA

KCCX Rainfall Estimate of Storm Total Rainfall

48-hour MutiSensor Precipitation Estimate from MARFC

48 Hour Precip Totals (10-7-2005 7am thru 10-9-2005 7am) from co-operative observer reports and automated gages

Hydrograph of River Stage for the Conestoga River at Lancaster, crested at 17.8 feet (Major Flooding) 3am EDT 10/9/2005

Text Reports of Rain and Flooding
Public Information Statement on 72-hour rainfall/storm totals (10/6/2005 7 am thru 10/9/205 7 am).
Summary of the preliminary storm damage reports (LSRCTP)

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Page Last Modified: 25 March 2006 22:46:29 UTC
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