Alert archive / North Carolina / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 812

July 29, 200337 counties in North Carolina; 19 counties in South Carolina

The Storm Prediction Center issued this severe thunderstorm watch at Jul 29, 2003, 3:00 PM EDT for 37 counties in North Carolina; 19 counties in South Carolina. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 29, 2003, 3:00 PM EDT (19:00 UTC)
Expired
Jul 29, 2003, 9:00 PM EDT
In force
6 hr
Issued by
the Storm Prediction Center
All 56 counties

Alexander County, NC, Anson County, NC, Bladen County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Chatham County, NC, Cleveland County, NC, Columbus County, NC, Cumberland County, NC, Davidson County, NC, Davie County, NC, Gaston County, NC, Harnett County, NC, Hoke County, NC, Iredell County, NC, Johnston County, NC, Lee County, NC, Lincoln County, NC, McDowell County, NC, Mecklenburg County, NC, Mitchell County, NC, Montgomery County, NC, Moore County, NC, Polk County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Rowan County, NC, Rutherford County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Union County, NC, Wake County, NC, Yancey County, NC, Abbeville County, SC, Cherokee County, SC, Chester County, SC, Chesterfield County, SC, Darlington County, SC, Dillon County, SC, Fairfield County, SC, Greenville County, SC, Greenwood County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lee County, SC, Marion County, SC, Marlboro County, SC, Newberry County, SC, Spartanburg County, SC, Union County, SC, York County, SC

The radar

The Greer radar (KGSP), 140 km from the middle of the area, began a volume at 19:03 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.

Warnings issued inside it

17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 29, 3:33 PM EDTFlash Flood WarningRAHWake87 min
Jul 29, 4:26 PM EDTSevere Thunderstorm WarningGSPAlexander, Catawba64 min
Jul 29, 4:47 PM EDTSevere Thunderstorm WarningGSPCherokee, Spartanburg, Union58 min
Jul 29, 5:25 PM EDTSevere Thunderstorm WarningGSPLincoln65 min
Jul 29, 5:28 PM EDTSevere Thunderstorm WarningGSPIredell47 min
Jul 29, 5:51 PM EDTSevere Thunderstorm WarningGSPGaston54 min
Jul 29, 6:16 PM EDTFlash Flood WarningGSPDavie, Rowan3 hr
Jul 29, 6:19 PM EDTSevere Thunderstorm WarningGSPMecklenburg56 min
Jul 29, 6:32 PM EDTSevere Thunderstorm WarningGSPRowan58 min
Jul 29, 6:42 PM EDTFlash Flood WarningGSPIredell2 hr
Jul 29, 7:10 PM EDTFlash Flood WarningGSPMecklenburg110 min
Jul 29, 7:11 PM EDTSevere Thunderstorm WarningGSPCabarrus49 min
Jul 29, 7:11 PM EDTSevere Thunderstorm WarningRAHStanly34 min
Jul 29, 7:27 PM EDTFlash Flood WarningRAHDavidson2 hr
Jul 29, 7:48 PM EDTSevere Thunderstorm WarningRAHStanly37 min
Jul 29, 8:18 PM EDTSevere Thunderstorm WarningRAHMontgomery27 min
Jul 29, 8:57 PM EDTFlash Flood WarningRAHRichmond93 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 7.0 hours before the alert went out and 120 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, Greensboro/Hi Pt, NC at 12:00Z on 2003-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 681 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, Greensboro/Hi Pt, NC at 12:00Z on 2003-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 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
681 J/kg
Mixed-layer CIN
-58 J/kg
Mixed-layer LCL
1045 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
54 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 29, 2:14 PM EDTMesoscale DiscussionSPCAlamance, Alexander, Anson, Buncombe, Burke, Cabarrus and 30 more2 hr
Jul 29, 4:51 PM EDTMesoscale DiscussionSPCAlamance, Anson, Cabarrus, Catawba, Chatham, Cleveland and 30 more114 min
Jul 29, 7:42 PM EDTMesoscale DiscussionSPCAnson, Beaufort, Bladen, Chatham, Columbus, Craven and 25 more93 min

Nearby

Severe Thunderstorm Watches in North Carolina, 2003Severe Thunderstorm Watches in South Carolina, 2003Every severe thunderstorm watch 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.