Alert archive / Virginia / Mesoscale Discussions in 2022

Mesoscale Discussion 438

April 7, 202221 counties in North Carolina; 26 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2022, 4:50 PM EDT for 21 counties in North Carolina; 26 counties in Virginia. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Apr 7, 2022, 4:50 PM EDT (20:50 UTC)
Expired: Apr 7, 2022, 6:45 PM EDT
In force: 115 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 104

All 47 counties

Beaufort County, NC, Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Dare County, NC, Edgecombe County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Hertford County, NC, Hyde County, NC, Martin County, NC, Nash County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Tyrrell County, NC, Washington County, NC, Wilson County, NC, Charles City County, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Hopewell, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Gloucester County, VA, Greensville County, VA, Isle of Wight County, VA, James City County, VA, Mathews County, VA, Northampton County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, York County, VA

The radar

The Norfolk radar (KAKQ), 58 km from the middle of the area, began a volume at 20:50 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.8 hours before the alert went out and 180 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 512 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 325 m²/s²
0-3 km storm-relative helicity: 381 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
Apr 7, 2:13 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 34 more	62 min
Apr 7, 3:09 PM EDT	Tornado Watch	SPC	Beaufort, Bertie, Camden, Carteret, Chowan, Craven and 31 more	6 hr
Apr 7, 3:11 PM EDT	Severe Thunderstorm Watch	SPC	Bladen, Brunswick, Columbus, Cumberland, New Hanover, Pender and 2 more	4 hr
Apr 7, 4:58 PM EDT	Mesoscale Discussion	SPC	Bladen, Brunswick, Columbus, Craven, Cumberland, Duplin and 7 more	2 hr
Apr 7, 7:22 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Camden, Chowan, Currituck, Gates and 6 more	83 min

Nearby

Mesoscale Discussions in Virginia, 2022 Mesoscale Discussions in North Carolina, 2022 Every mesoscale discussion in 2022

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.