Alert archive / Virginia / Mesoscale Discussions in 2003

Mesoscale Discussion 1726

July 8, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2003, 11:16 PM EDT for 4 states. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Jul 8, 2003, 11:16 PM EDT (03:16 UTC)
Expired
Jul 9, 2003, 1:15 AM EDT
In force
119 min
Issued by
the Storm Prediction Center
All 47 counties

Allegany County, MD, Bedford County, PA, Blair County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Mifflin County, PA, Perry County, PA, Amelia County, VA, Appomattox County, VA, Brunswick County, VA, Buckingham County, VA, Campbell County, VA, Charlotte County, VA, Chesterfield County, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Hopewell, VA, City of Martinsville, VA, City of Petersburg, VA, City of Richmond, VA, Cumberland County, VA, Dinwiddie County, VA, Goochland County, VA, Greensville County, VA, Halifax County, VA, Hanover County, VA, Henrico County, VA, Henry County, VA, Highland County, VA, Louisa County, VA, Lunenburg County, VA, Madison County, VA, Mecklenburg County, VA, Nottoway County, VA, Pittsylvania County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Rockingham County, VA, Sussex County, VA, Mineral County, WV, Pocahontas County, WV, Randolph County, WV, Webster County, WV

The radar

The Sterling radar (KLWX), 105 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

Roanoke, VA (KRNK), launched 00:00Z, 3.3 hours before the alert went out and 162 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, Roanoke, VA at 00:00Z on 2003-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2203 joules per kilogram.LCLEL10008507005003002001001 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, Roanoke, VA at 00:00Z on 2003-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.1939Sfc1 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
2203 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1225 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
8 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 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, 12:09 PM EDTMesoscale DiscussionSPCCalvert, Caroline, Charles, Dorchester, Kent, Queen Anne's and 5 more96 min
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 Pennsylvania, 2003Mesoscale Discussions in West Virginia, 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.