Alert archive / West Virginia / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 109

April 9, 20016 states

The Storm Prediction Center issued this severe thunderstorm watch at Apr 9, 2001, 7:00 PM EDT for 6 states. 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 65 counties

Kent County, DE, New Castle County, DE, Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, City of Baltimore, MD, Frederick County, MD, Garrett County, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Queen Anne's County, MD, Washington County, MD, Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Gallia County, OH, Scioto County, OH, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Manassas, VA, City of Manassas Park, VA, City of Winchester, VA, Clarke County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Loudoun County, VA, Prince William County, VA, Rappahannock County, VA, Shenandoah County, VA, Warren County, VA, Barbour County, WV, Berkeley County, WV, Braxton County, WV, Calhoun County, WV, Doddridge County, WV, Gilmer County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Harrison County, WV, Jackson County, WV, Jefferson County, WV, Lewis County, WV, Mason County, WV, Mineral County, WV, Morgan County, WV, Preston County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tucker County, WV, Upshur County, WV, Wirt County, WV

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 9, 7:01 PM EDTSevere Thunderstorm WarningPBZGarrett59 min
Apr 9, 7:16 PM EDTSevere Thunderstorm WarningRLXTaylor44 min
Apr 9, 7:21 PM EDTSevere Thunderstorm WarningLWXFrederick54 min
Apr 9, 7:21 PM EDTSevere Thunderstorm WarningLWXWashington54 min
Apr 9, 7:21 PM EDTSevere Thunderstorm WarningLWXJefferson54 min
Apr 9, 7:55 PM EDTSevere Thunderstorm WarningLWXBaltimore, Carroll65 min
Apr 9, 7:55 PM EDTSevere Thunderstorm WarningLWXHarford65 min
Apr 9, 8:02 PM EDTSevere Thunderstorm WarningPHICecil43 min
Apr 9, 8:05 PM EDTSevere Thunderstorm WarningLWXGrant, Hampshire, Hardy, Mineral40 min
Apr 9, 8:08 PM EDTSevere Thunderstorm WarningPBZTucker67 min
Apr 9, 8:22 PM EDTSevere Thunderstorm WarningLWXLoudoun38 min
Apr 9, 8:29 PM EDTSevere Thunderstorm WarningRLXHarrison46 min
Apr 9, 8:37 PM EDTSevere Thunderstorm WarningPHINew Castle38 min
Apr 9, 8:50 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem40 min
Apr 9, 8:56 PM EDTSevere Thunderstorm WarningPHIKent34 min
Apr 9, 8:56 PM EDTSevere Thunderstorm WarningPHICecil34 min
Apr 9, 8:56 PM EDTSevere Thunderstorm WarningPHICumberland34 min
Apr 9, 8:59 PM EDTSevere Thunderstorm WarningLWXPage, Shenandoah, Warren31 min
Apr 9, 8:59 PM EDTSevere Thunderstorm WarningLWXHardy31 min

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.0 hours before the alert went out and 143 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, Washington/Dulle, VA 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.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, Washington/Dulle, VA at 12:00Z on 2001-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
1273 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
29 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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, 2:30 PM EDTSevere Thunderstorm WatchSPCCecil6 hr
Apr 9, 7:00 PM EDTSevere Thunderstorm WatchSPCBergen, Burlington, Camden, Essex, Hudson, Hunterdon and 10 more5 hr
Apr 9, 11:00 AM EDTSevere Thunderstorm WatchSPCAshland, Belmont, Carroll, Columbiana, Coshocton, Cuyahoga and 27 more6 hr
Apr 9, 5:00 PM EDTSevere Thunderstorm WatchSPCAdams, Athens, Belmont, Carroll, Columbiana, Coshocton and 29 more5 hr
Apr 9, 7:15 PM EDTSevere Thunderstorm WatchSPCAuglaize, Brown, Butler, Champaign, Clark, Clermont and 12 more6 hr

Nearby

Severe Thunderstorm Watches in West Virginia, 2001Severe Thunderstorm Watches in Maryland, 2001Severe Thunderstorm Watches in Virginia, 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.