Alert archive / Virginia / Mesoscale Discussions in 2004

Mesoscale Discussion 1672

July 14, 200417 counties in North Carolina; 48 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2004, 6:10 PM EDT for 17 counties in North Carolina; 48 counties in Virginia. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
Jul 14, 2004, 6:10 PM EDT (22:10 UTC)
Expired
Jul 14, 2004, 7:15 PM EDT
In force
65 min
Issued by
the Storm Prediction Center
All 65 counties

Bertie County, NC, Camden County, NC, Chowan County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Halifax County, NC, Hertford County, NC, Martin County, NC, Nash County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Vance County, NC, Warren County, NC, Washington County, NC, Accomack County, VA, Amelia County, VA, Brunswick County, VA, Caroline County, VA, Charles City County, VA, Chesterfield 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 Richmond, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Dinwiddie County, VA, Essex County, VA, Gloucester County, VA, Goochland County, VA, Greensville County, VA, Hanover County, VA, Henrico County, VA, Isle of Wight County, VA, James City County, VA, King and Queen County, VA, King William County, VA, Lancaster County, VA, Lunenburg County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Nottoway County, VA, Powhatan County, VA, Prince George County, VA, Richmond County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, York County, VA

The radar

The Norfolk radar (KAKQ), 27 km from the middle of the area, began a volume at 22:10 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.2 hours before the alert went out and 199 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2004-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1096 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2004-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1096 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
628 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.5

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.

IssuedProductOfficeCountiesLasted
Jul 13, 9:20 PM EDTSevere Thunderstorm WatchSPCCherokee, Clay, Graham6 hr
Jul 13, 11:21 PM EDTMesoscale DiscussionSPCCherokee, Graham114 min
Jul 14, 8:35 AM EDTMesoscale DiscussionSPCAvery, Buncombe, Burke, Cleveland, Graham, Haywood and 11 more85 min
Jul 14, 10:40 AM EDTSevere Thunderstorm WatchSPCBuncombe, Cleveland, Henderson, Jackson, McDowell, Mitchell and 4 more6 hr
Jul 14, 12:18 PM EDTMesoscale DiscussionSPCAlleghany, Caswell, Rockingham, Stokes, Surry117 min
Jul 14, 1:03 PM EDTMesoscale DiscussionSPCCherokee, Clay, Graham, Macon, Swain117 min
Jul 14, 7:00 PM EDTSevere Thunderstorm WatchSPCAlamance, Bertie, Camden, Chatham, Chowan, Currituck and 22 more5 hr
Jul 14, 12:50 PM EDTTornado WatchSPCAccomack, Albemarle, Amelia, Appomattox, Arlington, Brunswick and 76 more6 hr
Jul 14, 3:05 PM EDTMesoscale DiscussionSPCAccomack, Albemarle, Amelia, Appomattox, Arlington, Brunswick and 76 more115 min

Nearby

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