Alert archive / Virginia / Mesoscale Discussions in 2004

Mesoscale Discussion 1417

June 25, 200411 counties in North Carolina; 35 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2004, 12:34 PM EDT for 11 counties in North Carolina; 35 counties in Virginia. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jun 25, 2004, 12:34 PM EDT (16:34 UTC)
Expired: Jun 25, 2004, 2:30 PM EDT
In force: 116 min
Issued by: the Storm Prediction Center

All 46 counties

Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Gates County, NC, Halifax County, NC, Hertford County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Warren County, NC, Accomack County, VA, Brunswick County, VA, 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, Dinwiddie County, VA, Gloucester County, VA, Greensville County, VA, Henrico County, VA, Isle of Wight County, VA, James City County, VA, King and Queen County, VA, Lancaster County, VA, Mathews County, VA, Middlesex County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, York County, VA

The radar

The Norfolk radar (KAKQ), 20 km from the middle of the area, began a volume at 16:34 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, 4.6 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1270 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 17 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
Jun 25, 4:43 PM EDT	Mesoscale Discussion	SPC	Hoke, Robeson, Scotland	2 hr
Jun 25, 5:35 PM EDT	Severe Thunderstorm Watch	SPC	Union	5 hr
Jun 25, 1:08 PM EDT	Mesoscale Discussion	SPC	Arlington, Clarke, Fairfax, Frederick, Loudoun, Prince William and 6 more	2 hr
Jun 25, 1:45 PM EDT	Severe Thunderstorm Watch	SPC	Albemarle, Arlington, Augusta, Bath, Caroline, Clarke and 33 more	7 hr

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.