Alert archive / Virginia / Mesoscale Discussions in 2024

Mesoscale Discussion 993

May 26, 20245 states

The Storm Prediction Center issued this mesoscale discussion at May 26, 2024, 7:22 PM EDT for 5 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: May 26, 2024, 7:22 PM EDT (23:22 UTC)
Expired: May 26, 2024, 8:45 PM EDT
In force: 83 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 317...318...321

All 56 counties

Allegany County, MD, Garrett County, MD, Columbiana County, OH, Jefferson County, OH, Mahoning County, OH, Trumbull County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Fayette County, PA, Greene County, PA, Lawrence County, PA, Mercer County, PA, Somerset County, PA, Venango County, PA, Washington County, PA, Westmoreland County, PA, Albemarle County, VA, Amherst County, VA, Appomattox County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Buckingham County, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, VA, City of Staunton, VA, City of Waynesboro, VA, Fluvanna County, VA, Greene County, VA, Highland County, VA, Nelson County, VA, Page County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Barbour County, WV, Brooke County, WV, Grant County, WV, Hampshire County, WV, Hancock County, WV, Hardy County, WV, Marion County, WV, Mineral County, WV, Monongalia County, WV, Ohio County, WV, Pendleton County, WV, Preston County, WV, Randolph County, WV, Taylor County, WV, Tucker County, WV

The radar

The Pittsburgh radar (KPBZ), 162 km from the middle of the area, began a volume at 23:24 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.

Severe Thunderstorm Watch 325May 26, 8:45 PM EDT

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 11.4 hours before the alert went out and 147 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 120 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 770 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: -17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
May 26, 5:36 PM EDT	Mesoscale Discussion	SPC	Garrett	114 min
May 26, 6:08 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Garrett	8 hr
May 26, 12:20 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Ashland, Athens, Auglaize, Brown and 56 more	85 min
May 26, 1:02 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Athens, Auglaize, Brown, Butler and 52 more	7 hr
May 26, 1:46 PM EDT	Severe Thunderstorm Watch	SPC	Washington	9 hr
May 26, 3:25 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Athens, Auglaize, Belmont, Carroll and 48 more	95 min
May 26, 3:52 PM EDT	Severe Thunderstorm Watch	SPC	Ashland, Ashtabula, Belmont, Carroll, Columbiana, Coshocton and 19 more	6 hr
May 26, 5:00 PM EDT	Mesoscale Discussion	SPC	Ashland, Belmont, Carroll, Columbiana, Coshocton, Crawford and 21 more	90 min
May 26, 1:13 PM EDT	Mesoscale Discussion	SPC	Bland, Buchanan, Carroll, Dickenson, Giles, Grayson and 13 more	92 min

Nearby

Mesoscale Discussions in Virginia, 2024 Mesoscale Discussions in West Virginia, 2024 Mesoscale Discussions in Pennsylvania, 2024 Every mesoscale discussion in 2024

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.