Alert archive / Virginia / Mesoscale Discussions in 2003

Mesoscale Discussion 1733

July 9, 200311 counties in Maryland; 43 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 9, 2003, 12:09 PM EDT for 11 counties in Maryland; 43 counties in Virginia. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Jul 9, 2003, 12:09 PM EDT (16:09 UTC)
Expired
Jul 9, 2003, 1:45 PM EDT
In force
96 min
Issued by
the Storm Prediction Center
All 54 counties

Calvert County, MD, Caroline County, MD, Charles County, MD, Dorchester County, MD, Kent County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Worcester County, MD, Accomack County, VA, Amelia County, VA, Caroline County, VA, Charles City County, VA, Charlotte County, VA, Chesterfield County, VA, City of Colonial Heights, 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 Williamsburg, VA, Dinwiddie County, VA, Essex County, VA, Gloucester County, VA, Goochland County, VA, Hanover County, VA, Henrico County, VA, Isle of Wight County, VA, James City County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Lancaster County, VA, Lunenburg County, VA, Mathews County, VA, Middlesex County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Nottoway County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Richmond County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA, York County, VA

The radar

The Norfolk radar (KAKQ), 91 km from the middle of the area, began a volume at 16:08 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, 4.2 hours before the alert went out and 133 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 2003-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 150 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 2003-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 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
150 J/kg
Mixed-layer CIN
-174 J/kg
Mixed-layer LCL
1569 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
69 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.

IssuedProductOfficeCountiesLasted
Jul 8, 8:12 PM EDTMesoscale DiscussionSPCAllegany, Carroll, Frederick, Garrett, Howard, Montgomery and 1 more93 min
Jul 8, 8:30 PM EDTSevere Thunderstorm WatchSPCAllegany, Frederick, Garrett, Washington4 hr
Jul 8, 11:16 PM EDTMesoscale DiscussionSPCAllegany119 min
Jul 9, 10:28 AM EDTMesoscale DiscussionSPCAnne Arundel, Baltimore, Calvert, Carroll, Cecil, Charles and 9 more92 min
Jul 9, 11:50 AM EDTSevere Thunderstorm WatchSPCAllegany, Anne Arundel, Baltimore, Carroll, Cecil, Frederick and 7 more6 hr
Jul 9, 1:15 PM EDTSevere Thunderstorm WatchSPCAnne Arundel, Calvert, Caroline, Cecil, Charles, Dorchester and 8 more8 hr
Jul 9, 2:47 PM EDTMesoscale DiscussionSPCAllegany, Baltimore, Carroll, Frederick, Garrett, Harford and 4 more88 min
Jul 9, 3:48 PM EDTMesoscale DiscussionSPCAnne Arundel, Calvert, Caroline, Charles, Dorchester, Kent and 7 more117 min
Jul 9, 7:36 PM EDTMesoscale DiscussionSPCAnne Arundel, Calvert, Caroline, Cecil, Charles, Dorchester and 8 more114 min
Jul 9, 12:55 PM EDTMesoscale DiscussionSPCWise3 hr

Nearby

Mesoscale Discussions in Virginia, 2003Mesoscale Discussions in Maryland, 2003Every mesoscale discussion in 2003

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.