Alert archive / West Virginia / Mesoscale Discussions in 2004

Mesoscale Discussion 580

May 7, 20045 states

The Storm Prediction Center issued this mesoscale discussion at May 7, 2004, 1:49 PM EDT for 5 states. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
May 7, 2004, 1:49 PM EDT (17:49 UTC)
Expired
May 7, 2004, 3:15 PM EDT
In force
86 min
Issued by
the Storm Prediction Center
All 63 counties

Allegany County, MD, Garrett County, MD, Washington County, MD, Athens County, OH, Belmont County, OH, Gallia County, OH, Guernsey County, OH, Harrison County, OH, Hocking County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Washington County, OH, Bedford County, PA, Fayette County, PA, Franklin County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Somerset County, PA, Washington County, PA, Westmoreland County, PA, City of Winchester, VA, Clarke County, VA, Frederick County, VA, Loudoun County, VA, Shenandoah County, VA, Warren County, VA, Barbour County, WV, Berkeley County, WV, Brooke 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, Marion County, WV, Marshall County, WV, Mason County, WV, Mineral County, WV, Monongalia County, WV, Morgan County, WV, Ohio County, WV, Pleasants County, WV, Preston County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Pittsburgh radar (KPBZ), 114 km from the middle of the area, began a volume at 17:51 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 5.8 hours before the alert went out and 104 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 12:00Z on 2004-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 50 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 12:00Z on 2004-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 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
50 J/kg
Mixed-layer CIN
-283 J/kg
Mixed-layer LCL
1094 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 7, 10:29 AM EDTMesoscale DiscussionSPCAllegany, Anne Arundel, Baltimore, Calvert, Caroline, Carroll and 13 more91 min
May 7, 11:00 AM EDTSevere Thunderstorm WatchSPCAllegany, Anne Arundel, Baltimore, Carroll, Frederick, Garrett and 5 more6 hr
May 7, 1:24 PM EDTMesoscale DiscussionSPCCecil, Kent, Queen Anne's96 min
May 7, 1:40 PM EDTSevere Thunderstorm WatchSPCCaroline, Cecil, Kent, Queen Anne's, Talbot3 hr
May 7, 4:35 PM EDTSevere Thunderstorm WatchSPCAllegany, Anne Arundel, Baltimore, Calvert, Caroline, Carroll and 16 more5 hr
May 7, 6:17 PM EDTMesoscale DiscussionSPCAnne Arundel, Baltimore, Calvert, Caroline, Charles, Dorchester and 13 more118 min
May 6, 9:37 PM EDTMesoscale DiscussionSPCDefiance, Erie, Fulton, Henry, Huron, Lucas and 7 more83 min
May 6, 10:10 PM EDTSevere Thunderstorm WatchSPCAllen, Crawford, Defiance, Fulton, Hancock, Henry and 11 more5 hr
May 6, 11:05 PM EDTMesoscale DiscussionSPCAshland, Ashtabula, Cuyahoga, Geauga, Lake, Lorain and 7 more85 min
May 6, 11:20 PM EDTSevere Thunderstorm WatchSPCAshland, Ashtabula, Carroll, Columbiana, Crawford, Cuyahoga and 27 more5 hr
May 7, 3:13 AM EDTMesoscale DiscussionSPCAshtabula, Carroll, Columbiana, Cuyahoga, Erie, Geauga and 15 more62 min
May 7, 7:38 AM EDTMesoscale DiscussionSPCMercer97 min
May 7, 9:30 AM EDTMesoscale DiscussionSPCAllen, Auglaize, Champaign, Clark, Coshocton, Darke and 26 more90 min
May 7, 9:30 AM EDTSevere Thunderstorm WatchSPCAllen, Auglaize, Butler, Champaign, Clark, Clinton and 24 more6 hr
May 7, 12:49 PM EDTMesoscale DiscussionSPCAthens, Champaign, Clark, Clinton, Delaware, Fairfield and 24 more86 min
May 7, 7:02 PM EDTMesoscale DiscussionSPCCaroline, Essex, Fluvanna, Gloucester, Goochland, Hanover and 13 more2 hr
May 7, 7:20 PM EDTSevere Thunderstorm WatchSPCAccomack, Caroline, Essex, Gloucester, Hanover, King and Queen and 10 more4 hr

Nearby

Mesoscale Discussions in West Virginia, 2004Mesoscale Discussions in Ohio, 2004Mesoscale Discussions in Pennsylvania, 2004Every mesoscale discussion in 2004

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; radar from the NEXRAD Level II archive.