Alert archive / Virginia / Mesoscale Discussions in 2022

Mesoscale Discussion 28

January 3, 20224 states

The Storm Prediction Center issued this mesoscale discussion at Jan 3, 2022, 5:13 AM EST for 4 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jan 3, 2022, 5:13 AM EST (10:13 UTC)
Expired: Jan 3, 2022, 9:15 AM EST
In force: 4 hr
Issued by: the Storm Prediction Center
Concerning: Heavy snow

All 62 counties

Anne Arundel County, MD, Charles County, MD, Prince George's County, MD, Alleghany County, NC, Ashe County, NC, Surry County, NC, Watauga County, NC, Johnson County, TN, Albemarle County, VA, Amherst County, VA, Appomattox County, VA, Arlington County, VA, Augusta County, VA, Bedford County, VA, Botetourt County, VA, Buckingham County, VA, Campbell County, VA, Carroll County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Covington, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Galax, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Waynesboro, VA, Craig County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Floyd County, VA, Fluvanna County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Greene County, VA, Madison County, VA, Montgomery County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Patrick County, VA, Prince William County, VA, Pulaski County, VA, Rappahannock County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Smyth County, VA, Spotsylvania County, VA, Stafford County, VA, Wythe County, VA

The radar

The Roanoke radar (KFCX), 47 km from the middle of the area, began a volume at 10:13 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 10.2 hours before the alert went out and 140 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: 3 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1335 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 1 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
Jan 3, 8:41 AM EST	Mesoscale Discussion	SPC	Caroline, Cecil, Dorchester, Kent, Queen Anne's, Talbot	3 hr
Jan 3, 11:06 AM EST	Mesoscale Discussion	SPC	Anne Arundel, Calvert, Caroline, Cecil, Charles, Dorchester and 10 more	5 hr
Jan 2, 7:19 PM EST	Mesoscale Discussion	SPC	Cherokee, Graham, Haywood, Madison, Swain	5 hr
Jan 3, 4:25 AM EST	Mesoscale Discussion	SPC	Bladen, Brunswick, Carteret, Columbus, Craven, Duplin and 9 more	3 hr
Jan 3, 5:41 AM EST	Tornado Watch	SPC	Beaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 9 more	5 hr
Jan 3, 7:47 AM EST	Mesoscale Discussion	SPC	Carteret, Craven, Dare, Hyde, Jones, Onslow and 1 more	118 min

Nearby

Mesoscale Discussions in Virginia, 2022 Mesoscale Discussions in North Carolina, 2022 Mesoscale Discussions in Maryland, 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.