Alert archive / West Virginia / Mesoscale Discussions in 2018

Mesoscale Discussion 395

May 12, 20185 states

The Storm Prediction Center issued this mesoscale discussion at May 12, 2018, 5:05 PM EDT for 5 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: May 12, 2018, 5:05 PM EDT (21:05 UTC)
Expired: May 12, 2018, 7:00 PM EDT
In force: 115 min
Issued by: the Storm Prediction Center

All 68 counties

Allegany County, MD, Frederick County, MD, Garrett County, MD, Washington County, MD, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Jefferson County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Tuscarawas County, OH, Washington County, OH, Adams County, PA, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Cumberland County, PA, Fayette County, PA, Franklin County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Juniata County, PA, Mifflin County, PA, Perry 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, Doddridge County, WV, Grant County, WV, Hampshire County, WV, Hancock County, WV, Hardy County, WV, Harrison County, WV, Jefferson 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), 77 km from the middle of the area, began a volume at 21:06 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 nearest sounding before it

Pittsburgh, PA (KAGC), launched 12:00Z, 9.1 hours before the alert went out and 60 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1381 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 312 m²/s²
0-3 km storm-relative helicity: 354 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 12, 1:51 PM EDT	Mesoscale Discussion	SPC	Allegany, Garrett	2 hr
May 12, 2:47 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Calvert, Charles, Frederick, Garrett, Montgomery and 3 more	8 hr
May 12, 3:59 PM EDT	Mesoscale Discussion	SPC	Baltimore, Carroll, Cecil, Harford, Howard, Kent and 3 more	3 hr
May 12, 4:58 PM EDT	Tornado Watch	SPC	Anne Arundel, Baltimore, Caroline, Carroll, Cecil, Harford and 5 more	5 hr
May 12, 7:16 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Caroline, Carroll, Cecil, Harford and 5 more	59 min
May 12, 4:20 PM EDT	Mesoscale Discussion	SPC	Butler, Champaign, Clark, Clinton, Darke, Fairfield and 12 more	115 min

Nearby

Mesoscale Discussions in West Virginia, 2018 Mesoscale Discussions in Pennsylvania, 2018 Mesoscale Discussions in Ohio, 2018 Every mesoscale discussion in 2018

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.