A powerful storm system will continue to bring heavy mountain snow, rain, and high winds to the Pacific Northwest and northern California through midweek. Heavy rain and flash flooding potential exists across the central Gulf Coast over the next few days, including the Florida Panhandle. A Slight Risk (level 2 of 4) of excessive rainfall is in effect Tuesday. Read More >
Overview
Unseasonably warm and moist air over the region on Wednesday April 27th fueled severe thunderstorms. The thunderstorms occurred ahead of a cold front which would move through on Thursday morning. This was the same storm system responsible for the deadly outbreak of tornadoes across the Deep South that same evening and overnight. One tornado occurred in the evening of the 27th, and five more tornadoes occurred in Central PA after midnight in the early morning hours of April 28th, 2011. The strength of these tornadoes ranged from EF0 to EF2 on the Enhanced Fujita Scale.
Map of Confirmed Central PA Tornadoes |
Tornadoes:
Tornado - Ayers Hill Tornado
Track Map Downloadable KMZ File |
Tornado - Broad Top City
Track Map Downloadable KMZ File |
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Tornado - East Waterford
Track Map Downloadable KMZ File |
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Tornado - Round Top
Track Map Downloadable KMZ File |
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Tornado - Palmyra Tornado
Track Map Downloadable KMZ File |
Tornado - Ono
Track Map Downloadable KMZ File |
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The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
Rainfall Amounts
Map of rainfall amounts for April 26th |
Map of rainfall amounts for April 27th |
Map of rainfall amounts for April 28th |
Environment
Insert synoptic summary.
Figure 1: 250mb Winds and Heights | Figure 2: 500mb Winds and Heights | Figure 3: 850mb Winds and Heights |
Figure 4: KPIT April 27,2011 12Z Sounding | Figure 5: KPIT April 28, 2011 00Z Sounding | Figure 6: 700mb Winds and Heights |
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