Alert archive / North Carolina / Mesoscale Discussions in 2004

Mesoscale Discussion 931

May 26, 20048 counties in North Carolina; 4 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at May 26, 2004, 11:21 PM EDT for 8 counties in North Carolina; 4 counties in Virginia. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: May 26, 2004, 11:21 PM EDT (03:21 UTC)
Expired: May 27, 2004, 12:15 AM EDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Beaufort County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Pasquotank County, NC, Perquimans County, NC, Tyrrell County, NC, Washington County, NC, City of Chesapeake, VA, City of Norfolk, VA, City of Virginia Beach, VA, Northampton County, VA

The radar

The Norfolk radar (KAKQ), 101 km from the middle of the area, began a volume at 03:20 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, 3.4 hours before the alert went out and 182 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: 1336 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 741 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 8.1

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
May 26, 9:15 PM EDT	Severe Thunderstorm Watch	SPC	Beaufort, Bertie, Camden, Chowan, Currituck, Edgecombe and 13 more	5 hr
May 26, 9:40 PM EDT	Mesoscale Discussion	SPC	Anson, Haywood, Henderson, Jackson, Polk, Transylvania and 1 more	65 min
May 27, 3:28 AM EDT	Mesoscale Discussion	SPC	Alexander, Alleghany, Ashe, Avery, Burke, Caldwell and 6 more	92 min
May 26, 8:19 PM EDT	Mesoscale Discussion	SPC	Amelia, Arlington, Brunswick, Caroline, Charles City, Charlotte and 33 more	116 min
May 27, 3:07 PM EDT	Mesoscale Discussion	SPC	Albemarle, Arlington, Augusta, Buckingham, Caroline, Clarke and 42 more	113 min

Nearby

Mesoscale Discussions in North Carolina, 2004 Mesoscale Discussions in Virginia, 2004 Every mesoscale discussion in 2004

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.