Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 946

November 12, 20034 states

The Storm Prediction Center issued this severe thunderstorm watch at Nov 12, 2003, 7:20 PM EST for 4 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Nov 12, 2003, 7:20 PM EST (00:20 UTC)
Expired
Nov 12, 2003, 11:00 PM EST
In force
4 hr
Issued by
the Storm Prediction Center
All 39 counties

Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Wyoming County, NY, Belmont County, OH, Columbiana County, OH, Jefferson County, OH, Mahoning County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Clarion County, PA, Clearfield County, PA, Crawford County, PA, Elk County, PA, Erie County, PA, Fayette County, PA, Forest County, PA, Greene County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, McKean County, PA, Mercer County, PA, Somerset County, PA, Venango County, PA, Warren County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV

Warnings issued inside it

21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Nov 12, 7:45 PM ESTSevere Thunderstorm WarningPBZColumbiana60 min
Nov 12, 7:46 PM ESTSevere Thunderstorm WarningCLEMahoning, Portage59 min
Nov 12, 7:56 PM ESTSevere Thunderstorm WarningCLECrawford64 min
Nov 12, 8:22 PM ESTSevere Thunderstorm WarningPBZMercer53 min
Nov 12, 8:37 PM ESTSevere Thunderstorm WarningPBZLawrence53 min
Nov 12, 8:41 PM ESTSevere Thunderstorm WarningPBZBelmont64 min
Nov 12, 8:51 PM ESTSevere Thunderstorm WarningPBZBeaver54 min
Nov 12, 8:54 PM ESTSevere Thunderstorm WarningPBZOhio36 min
Nov 12, 9:05 PM ESTSevere Thunderstorm WarningPBZWashington55 min
Nov 12, 9:12 PM ESTSevere Thunderstorm WarningPBZButler63 min
Nov 12, 9:19 PM ESTSevere Thunderstorm WarningBUFErie56 min
Nov 12, 9:40 PM ESTSevere Thunderstorm WarningBUFCattaraugus50 min
Nov 12, 9:42 PM ESTSevere Thunderstorm WarningBUFGenesee48 min
Nov 12, 9:47 PM ESTSevere Thunderstorm WarningPBZAllegheny28 min
Nov 12, 10:01 PM ESTSevere Thunderstorm WarningPBZArmstrong59 min
Nov 12, 10:03 PM ESTSevere Thunderstorm WarningPBZJefferson57 min
Nov 12, 10:08 PM ESTSevere Thunderstorm WarningPBZWestmoreland52 min
Nov 12, 10:09 PM ESTSevere Thunderstorm WarningPBZIndiana66 min
Nov 12, 10:11 PM ESTSevere Thunderstorm WarningCTPClearfield49 min
Nov 12, 10:14 PM ESTSevere Thunderstorm WarningPBZFayette61 min
Nov 12, 10:21 PM ESTSevere Thunderstorm WarningBUFLivingston24 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 0.3 hours before the alert went out and 91 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Pittsburgh, PA at 00:00Z on 2003-11-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 15 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 00:00Z on 2003-11-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 303 square meters per square second.1939587897117136156175Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
15 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
711 m above ground
0-6 km bulk shear
101 kt
0-1 km storm-relative helicity
303 m²/s²
0-3 km storm-relative helicity
323 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 12, 9:39 PM ESTMesoscale DiscussionSPCAllegany, Cattaraugus, Erie, Genesee, Livingston, Monroe and 2 more66 min

Nearby

Severe Thunderstorm Watches in Pennsylvania, 2003Severe Thunderstorm Watches in New York, 2003Severe Thunderstorm Watches in Ohio, 2003Every severe thunderstorm watch in 2003

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.