Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 110

April 9, 200116 counties in New Jersey; 4 counties in New York; 33 counties in Pennsylvania

The Storm Prediction Center issued this severe thunderstorm watch at Apr 9, 2001, 7:00 PM EDT for 16 counties in New Jersey; 4 counties in New York; 33 counties in Pennsylvania. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 9, 2001, 7:00 PM EDT (23:00 UTC)
Expired
Apr 10, 2001, 12:00 AM EDT
In force
5 hr
Issued by
the Storm Prediction Center
All 53 counties

Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Kings County, NY, New York County, NY, Richmond County, NY, Rockland County, NY, Adams County, PA, Bedford County, PA, Berks County, PA, Blair County, PA, Bucks County, PA, Carbon County, PA, Centre County, PA, Chester County, PA, Clearfield County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Mifflin County, PA, Monroe County, PA, Montgomery County, PA, Montour County, PA, Northampton County, PA, Northumberland County, PA, Perry County, PA, Philadelphia County, PA, Schuylkill County, PA, Snyder County, PA, Union County, PA, York County, PA

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 9, 7:06 PM EDTSevere Thunderstorm WarningCTPDauphin, Northumberland69 min
Apr 9, 7:08 PM EDTSevere Thunderstorm WarningCTPAdams, York97 min
Apr 9, 7:25 PM EDTSevere Thunderstorm WarningCTPLebanon, Schuylkill80 min
Apr 9, 7:28 PM EDTSevere Thunderstorm WarningCTPLancaster62 min
Apr 9, 7:30 PM EDTSevere Thunderstorm WarningPHIMorris30 min
Apr 9, 7:38 PM EDTSevere Thunderstorm WarningOKXBergen, Essex, Hudson, Passaic37 min
Apr 9, 8:02 PM EDTSevere Thunderstorm WarningPHIChester43 min
Apr 9, 8:04 PM EDTSevere Thunderstorm WarningPHISussex, Warren26 min
Apr 9, 8:06 PM EDTSevere Thunderstorm WarningOKXNew York39 min
Apr 9, 8:09 PM EDTSevere Thunderstorm WarningPHIChester, Montgomery36 min
Apr 9, 8:09 PM EDTSevere Thunderstorm WarningPHIBucks36 min
Apr 9, 8:37 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer38 min
Apr 9, 8:37 PM EDTSevere Thunderstorm WarningPHIDelaware, Philadelphia38 min
Apr 9, 8:50 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth40 min
Apr 9, 8:50 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden40 min
Apr 9, 9:01 PM EDTSevere Thunderstorm WarningPHIOcean29 min

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.0 hours before the alert went out and 141 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, Phillips Aaf/Abe, MD at 12:00Z on 2001-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Phillips Aaf/Abe, MD at 12:00Z on 2001-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1054 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 9, 7:00 PM EDTSevere Thunderstorm WatchSPCAtlantic, Cape May, Cumberland, Gloucester, Salem5 hr
Apr 9, 11:00 AM EDTSevere Thunderstorm WatchSPCAllegheny, Armstrong, Beaver, Butler, Cambria, Clarion and 15 more6 hr
Apr 9, 2:30 PM EDTSevere Thunderstorm WatchSPCAdams, Bedford, Berks, Blair, Cameron, Centre and 22 more6 hr
Apr 9, 5:00 PM EDTSevere Thunderstorm WatchSPCAllegheny, Armstrong, Beaver, Butler, Cambria, Clarion and 9 more5 hr

Nearby

Severe Thunderstorm Watches in Pennsylvania, 2001Severe Thunderstorm Watches in New Jersey, 2001Severe Thunderstorm Watches in New York, 2001Every severe thunderstorm watch in 2001

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.