Alert archive / Virginia / Mesoscale Discussions in 2004

Mesoscale Discussion 760

May 19, 200415 counties in North Carolina; 21 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at May 19, 2004, 1:18 PM EDT for 15 counties in North Carolina; 21 counties in Virginia. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: May 19, 2004, 1:18 PM EDT (17:18 UTC)
Expired: May 19, 2004, 3:15 PM EDT
In force: 117 min
Issued by: the Storm Prediction Center

All 36 counties

Bertie County, NC, Camden County, NC, Caswell County, NC, Chowan County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Halifax County, NC, Hertford County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Person County, NC, Vance County, NC, Warren County, NC, Brunswick County, VA, Charlotte County, VA, City of Chesapeake, VA, City of Danville, VA, City of Emporia, VA, City of Franklin, VA, City of Martinsville, VA, City of Norfolk, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, Dinwiddie County, VA, Greensville County, VA, Halifax County, VA, Isle of Wight County, VA, Lunenburg County, VA, Mecklenburg County, VA, Nottoway County, VA, Pittsylvania County, VA, Southampton County, VA, Sussex County, VA

The radar

The Raleigh/Durham radar (KRAX), 108 km from the middle of the area, began a volume at 17:18 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 12:00Z, 5.3 hours before the alert went out and 167 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: 193 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 880 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 19, 2:52 AM EDT	Mesoscale Discussion	SPC	Arlington, Clarke, Fairfax, Fauquier, Frederick, Loudoun and 10 more	3 hr
May 19, 3:01 PM EDT	Mesoscale Discussion	SPC	Accomack, Albemarle, Amherst, Augusta, Buckingham, Caroline and 41 more	119 min

Nearby

Mesoscale Discussions in Virginia, 2004 Mesoscale Discussions in North Carolina, 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.