Alert archive / Pennsylvania / Severe Thunderstorm Warnings / 2009

Severe Thunderstorm Warnings in Pennsylvania, December 2009

12 severe thunderstorm warnings in December 2009. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.

Severe Thunderstorm Warnings by county

Each county as a circle sized by its count in December 2009. Tap one for its archive.

Severe Thunderstorm Warnings
12
Busiest day
December 9, 20099 severe thunderstorm warnings

Over time

By day

Days in UTC, the clock the archive keeps.

The alerts

Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeCountiesLasted
Dec 3, 3:31 AM ESTSevere Thunderstorm WarningCTPCameron, Centre, Clinton, Huntingdon, Lycoming, Mifflin and 2 more29 min
Dec 3, 4:48 AM ESTSevere Thunderstorm WarningCTPColumbia, Lycoming, Montour, Northumberland, Schuylkill, Sullivan42 min
Dec 3, 5:41 AM ESTSevere Thunderstorm WarningPHIBucks, Carbon, Lehigh, Monroe, Montgomery, Northampton49 min
Dec 9, 12:18 PM ESTSevere Thunderstorm WarningPBZVenango27 min
Dec 9, 1:04 PM ESTSevere Thunderstorm WarningCTPWarren56 min
Dec 9, 1:05 PM ESTSevere Thunderstorm WarningPBZClarion, Forest, Jefferson25 min
Dec 9, 1:07 PM ESTSevere Thunderstorm WarningPBZArmstrong, Indiana, Westmoreland53 min
Dec 9, 1:09 PM ESTSevere Thunderstorm WarningPBZForest, Venango21 min
Dec 9, 1:29 PM ESTSevere Thunderstorm WarningPBZFayette, Indiana, Westmoreland31 min
Dec 9, 1:31 PM ESTSevere Thunderstorm WarningCTPElk, McKean, Warren59 min
Dec 9, 1:49 PM ESTSevere Thunderstorm WarningCTPCambria, Clearfield, Somerset41 min
Dec 9, 3:05 PM ESTSevere Thunderstorm WarningPBZArmstrong, Clarion, Jefferson40 min

By county

Every county with at least one alert. A county page lists each alert that covered it.

Nearby

Alerts in force nowTornadoes on recordThe radar archive20082010

Sources

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.