Alert archive / North Carolina / Mesoscale Discussions in 2003

Mesoscale Discussion 873

May 9, 20034 states

The Storm Prediction Center issued this mesoscale discussion at May 9, 2003, 3:53 AM EDT for 4 states. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
May 9, 2003, 3:53 AM EDT (07:53 UTC)
Expired
May 9, 2003, 5:30 AM EDT
In force
97 min
Issued by
the Storm Prediction Center
All 63 counties

Franklin County, GA, Habersham County, GA, Hart County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Alexander County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Clay County, NC, Cleveland County, NC, Gaston County, NC, Haywood County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mecklenburg County, NC, Mitchell County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Swain County, NC, Transylvania County, NC, Union County, NC, Watauga County, NC, Wilkes County, NC, Yancey County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Fairfield County, SC, Greenville County, SC, Greenwood County, SC, Lancaster County, SC, Laurens County, SC, Newberry County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, Union County, SC, York County, SC, Carter County, TN, Cocke County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN

The radar

The Greer radar (KGSP), 61 km from the middle of the area, began a volume at 07:53 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 7.9 hours before the alert went out and 238 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 00:00Z on 2003-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 63 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 00:00Z on 2003-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.1939587897Sfc1 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
63 J/kg
Mixed-layer CIN
-110 J/kg
Mixed-layer LCL
2457 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
109 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.

843 
ACUS11 KWNS 090754
SWOMCD
SPC MCD 090753 
SCZ000-NCZ000-TNZ000-GAZ000-090930-

MESOSCALE DISCUSSION 0873
NWS STORM PREDICTION CENTER NORMAN OK
0253 AM CDT FRI MAY 09 2003

AREAS AFFECTED...NERN TN/WRN NC/NWRN SC

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 090753Z - 090930Z

TSTM COMPLEX OVER FAR NERN TN WILL CONTINUE TO POSE A LARGE
HAIL/DAMAGING WIND THREAT FOR THE NEXT FEW HOURS AS IS MOVES SEWD AT
AROUND 30KTS.

STRONG STORM /PERIODICALLY EXHIBITING SUPERCELL CHARACTERISTICS/
EMBEDDED IN SMALL CONVECTIVE COMPLEX OVER CARTER COUNTY IN FAR NERN
TN HAS RECENTLY PRODUCED A 66MPH WIND GUST AT THE TRI-CITIES
REGIONAL AIRPORT. IT APPEARS THAT FORCING FOR LARGE-SCALE ASCENT
AHEAD OF WEAK SHORTWAVE TROUGH OVER ERN KY IN CONJUNCTION WITH
LOW-LEVEL WAA ON NOSE OF SWLY LLJ JET IS SUSTAINING THIS ACTIVITY AS
IT MOVES SEWD.

LATEST MESOANALYSIS INDICATES THAT THIS CONVECTION HAS JUST MOVED S
OF SURFACE STATIONARY FRONT WHICH EXTENDS FROM ROUGHLY ALONG THE
VA/NC STATE LINE NWWD INTO ERN KY NEAR JKL. GIVEN THE STORM MOTION
RELATIVELY TO THE LLJ ORIENTATION...STORM-RELATIVE INFLOW REMAINS
QUITE STRONG /35-45KTS/ WHICH SHOULD CONTINUE TO SUSTAIN THE TSTMS
AS THEY MOVE INTO WRN NC. RUC POINT FORECAST SOUNDINGS S OF THE
FRONTAL BOUNDARY ACROSS WRN NC INTO NWRN SC INDICATE A SLIGHTLY
UNSTABLE AIRMASS WITH MLCAPES OF 500-1000 J/KG. THEREFORE...IT
APPEARS THAT THE THREAT OF ISOLATED WIND DAMAGE/LARGE HAIL WILL
PERSIST FOR THE NEXT FEW HOURS. A WW IS BEING CONSIDERED FOR THE
AREA.

..MEAD.. 05/09/2003

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...RAH...RNK...CAE...GSP...MRX...FFC...

35408371 36048360 36508342 36588272 36558185 36258075
35598047 34658051 34138106 33978213 34458350 34798384

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 3:55 PM EDTMesoscale DiscussionSPCAlamance, Bertie, Camden, Caswell, Chatham, Chowan and 30 more2 hr
May 9, 4:15 PM EDTTornado WatchSPCBertie, Camden, Chowan, Currituck, Durham, Edgecombe and 16 more6 hr
May 9, 6:53 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Chowan, Craven, Dare, Durham and 21 more97 min
May 9, 7:20 PM EDTTornado WatchSPCBeaufort, Carteret, Craven, Duplin, Greene, Hyde and 7 more4 hr
May 9, 7:35 PM EDTSevere Thunderstorm WatchSPCPickett5 hr

Nearby

Mesoscale Discussions in North Carolina, 2003Mesoscale Discussions in South Carolina, 2003Mesoscale Discussions in Tennessee, 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.