Alert archive / Virginia / Mesoscale Discussions in 2007

Mesoscale Discussion 27

January 6, 20074 counties in North Carolina; 8 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jan 6, 2007, 5:19 AM EST for 4 counties in North Carolina; 8 counties in Virginia. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Jan 6, 2007, 5:19 AM EST (10:19 UTC)
Expired: Jan 6, 2007, 6:15 AM EST
In force: 56 min
Issued by: the Storm Prediction Center

Counties Camden County, NC, Currituck County, NC, Pasquotank County, NC, Perquimans County, NC, City of Chesapeake, VA, City of Hampton, VA, City of Norfolk, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Virginia Beach, VA, Mathews County, VA, Northampton County, VA

The radar

The Norfolk radar (KAKQ), 101 km from the middle of the area, began a volume at 10:21 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 00:00Z, 10.3 hours before the alert went out and 126 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: 23 J/kg
Mixed-layer CIN: -212 J/kg
Mixed-layer LCL: 559 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 182 m²/s²
0-3 km storm-relative helicity: 231 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 5, 9:01 PM EST	Mesoscale Discussion	SPC	Beaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 19 more	89 min
Jan 5, 10:16 PM EST	Mesoscale Discussion	SPC	Beaufort, Bertie, Camden, Chowan, Craven, Currituck and 20 more	89 min
Jan 6, 12:58 AM EST	Tornado Watch	SPC	Cumberland, Durham, Edgecombe, Franklin, Granville, Halifax and 12 more	3 hr
Jan 6, 3:11 AM EST	Mesoscale Discussion	SPC	Bertie, Camden, Chowan, Currituck, Gates, Hertford and 4 more	64 min
Jan 6, 4:15 AM EST	Tornado Watch	SPC	Bertie, Camden, Chowan, Currituck, Gates, Hertford and 2 more	107 min

Nearby

Mesoscale Discussions in Virginia, 2007 Mesoscale Discussions in North Carolina, 2007 Every mesoscale discussion in 2007

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.