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|More Flash Flooding and Severe Weather in York County on June 2nd, 2006|
For the second straight day, York County, PA, bore the brunt of the Thunderstorms that formed over Central PA. The afternoon and evening brought many thunderstorms to the state, but the repeated thunderstorms over York County produced a widespread flooding event that affected most of the southern two-thirds of the county. The rains were less concentrated than the day before, but the already-wet ground and torrential downpours produced many more flooding reports than Thursday (the 1st). Traffic on the southbound side of Interstate 83 to the south of the City of York (near the Glen Rock Exit) was slowed or stopped due to a foot or more of water on the roadway surface. In addition to the flooding, a rotating thunderstorm cell produced at least two incidents of wind damage south of the City of York.
Preliminary Damage Reports in Text format
Infrared Satellite Picture from 2203z (603pm EDT) with multiple storms over York County.
KCCX WSR-88D One Hour Precipitation Estimate from 2105z through 2205z for York County. Note the yellow colors inside the purples, indicating possibly over two inches of rain in just one hour! These estimates were deemed very accurate, as very little hail was reported from these storms, and the precipitation algorithm setting that was incorrect the day before (the 1st) had been corrected by NWS CTP Staff. Again, this area received torrential rains in one hour (then additional rain later), with a well-corroborated rain gage report from a storm spotter in the area of 2.5 inches of rain in just an hour and a half.
KCCX WSR-88D Storm Relative Motion from 2203z. Note the red and green colors right next to each other (a velocity couplet) over South-Central York County indicating a mesocyclone (mid-level cyclonic rotation) in the thunderstorm cell. This cell is the one that produced the wind damage, and it also contributed to the flooding. The mesocyclone was an indication of the very strong updraft in the storm.
People often ask us - "What is the advantage of a Doppler Radar?" Well - this is it! We (as radar operators) can see the storm-scale rotation, and make inferences about the strength and severity of the individual storm cells. Not every storm has the potential to make wind damage and hail, and the doppler radar gives us the ability to infer more about the storm from it's structure than we could with only reflectivity.
KCCX WSR-88D Reflectivity from 2203z. This is the same time and view of the SRM picture immediately above. Note the strong reflectivities, and the sharp gradient on the southeastern side of the cell. This is sometimes a sign of rotation and a mesocyclone, and corresponds very well with the SRM pic above.
2006 Weather Events/Features:
- Mini Severe Weather Event (Bow Echoes), March 13th.
- Hail Storms of April 3rd
- May 1st, 2006 - Tussey Mountain Wildfire
- May 30th, 2006 - Severe Pulse Thunderstorms
- May 31st, 2006 - Severe Pulse Thunderstorms, take #2
- June 1st, 2006 - Flash Flooding in York County
- June 2nd, 2006 - More Flash Flooding and Severe Weather in York County
- June 9th, 2006 - Severe Thunderstorms - Hail and Wind
- June 22nd, 2006 - Widespread Severe Thunderstorms
- Flooding of Late June 2006 - Widespread Flooding
- July 9th, 2006 - More Severe Pulse Thunderstorms
- July 10th, 2006 - Anti-Cyclonic Mesocyclone over Elk County
- July 18th, 2006 - Hail and Wind Producing Storms
- July 27th, 2006 - Hail and Wind Producing Storms
- August 25-26th, 2006 - Long-Lived Supercells
- September 1-2, 2006 - Rain from the remnants of TS Ernesto
- September 28th, 2006 - Severe Thunderstorms, including F1 Tornado in Cumberland County
- November 16th, 2006 - Severe Thunderstorms
- December 1st, 2006 - Severe Thunderstorms, including F1 Tornado in Dauphin County
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