Alert archive / West Virginia / Mesoscale Discussions in 2020

Mesoscale Discussion 304

April 8, 20205 states

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2020, 1:52 AM EDT for 5 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
Apr 8, 2020, 1:52 AM EDT (05:52 UTC)
Expired
Apr 8, 2020, 3:15 AM EDT
In force
83 min
Issued by
the Storm Prediction Center
All 41 counties

Allegany County, MD, Garrett County, MD, Belmont County, OH, Guernsey County, OH, Harrison County, OH, Monroe County, OH, Noble County, OH, Washington County, OH, Bedford County, PA, Cambria County, PA, Fayette County, PA, Fulton County, PA, Greene County, PA, Somerset County, PA, Washington County, PA, Westmoreland County, PA, City of Winchester, VA, Frederick County, VA, Barbour County, WV, Berkeley County, WV, Doddridge County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Harrison County, WV, Jefferson County, WV, Lewis County, WV, Marion County, WV, Marshall County, WV, Mineral County, WV, Monongalia County, WV, Morgan County, WV, Ohio County, WV, Pleasants County, WV, Preston County, WV, Ritchie County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Wetzel County, WV, Wood County, WV

The radar

The Pittsburgh radar (KPBZ), 82 km from the middle of the area, began a volume at 05:54 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 00:00Z, 5.9 hours before the alert went out and 68 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 2020-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 43 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 2020-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 346 square meters per square second.1939587897117Sfc1 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
43 J/kg
Mixed-layer CIN
-141 J/kg
Mixed-layer LCL
1005 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
346 m²/s²
0-3 km storm-relative helicity
427 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 7, 11:40 PM EDTSevere Thunderstorm WatchSPCGarrett6 hr
Apr 8, 2:14 AM EDTSevere Thunderstorm WatchSPCAllegany, Washington2 hr
Apr 8, 3:53 AM EDTMesoscale DiscussionSPCCarroll, Frederick, Howard, Montgomery, Prince George's, City of Baltimore97 min
Apr 7, 9:07 PM EDTSevere Thunderstorm WatchSPCAllen, Ashland, Ashtabula, Auglaize, Crawford, Cuyahoga and 33 more6 hr
Apr 7, 10:04 PM EDTMesoscale DiscussionSPCAllen, Ashland, Ashtabula, Auglaize, Carroll, Columbiana and 42 more86 min
Apr 8, 3:16 AM EDTMesoscale DiscussionSPCAthens, Clark, Clinton, Fairfield, Fayette, Gallia and 15 more89 min
Apr 8, 5:30 AM EDTMesoscale DiscussionSPCFayette, Gallia, Highland, Jackson, Meigs, Pike and 2 more30 min
Apr 8, 12:39 PM EDTMesoscale DiscussionSPCAdams, Brown, Clermont, Gallia, Lawrence, Scioto96 min
Apr 8, 1:10 PM EDTSevere Thunderstorm WatchSPCLawrence7 hr
Apr 8, 6:52 PM EDTMesoscale DiscussionSPCAdams, Brown, Butler, Clark, Clermont, Clinton and 13 more2 hr
Apr 8, 7:24 PM EDTTornado WatchSPCAdams, Brown, Butler, Clermont, Clinton, Fayette and 9 more5 hr
Apr 7, 10:54 PM EDTMesoscale DiscussionSPCArmstrong, Blair, Butler, Cambria, Cameron, Centre and 19 more2 hr
Apr 8, 4:05 PM EDTMesoscale DiscussionSPCBedford, Bland, Buchanan, Carroll, Craig, Dickenson and 20 more85 min
Apr 8, 6:06 PM EDTMesoscale DiscussionSPCCity of Danville84 min

Nearby

Mesoscale Discussions in West Virginia, 2020Mesoscale Discussions in Pennsylvania, 2020Mesoscale Discussions in Ohio, 2020Every mesoscale discussion in 2020

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.