An upper level trough coinciding with surface frontal boundaries will focus showers and thunderstorms from the Great Lakes region into the Ohio and Tennessee Valley's, central and southern Plains. Instances of flash flooding, damaging winds and large hail are possible. Meanwhile, increasing waves and rip currents for portions of the eastern seaboard this week as tropical Atlantic is active. 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.
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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 |
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Rainfall Amounts
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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.
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Figure 1: 250mb Winds and Heights | Figure 2: 500mb Winds and Heights | Figure 3: 850mb Winds and Heights |
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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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