Alert archive / North Carolina / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 1, NWS Greenville-Spartanburg, SC

February 12, 2000Haywood County, Jackson County, North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Feb 12, 2000, 3:38 AM EST for Haywood County, Jackson County, North Carolina. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Feb 12, 2000, 3:38 AM EST (08:38 UTC)
Expired: Feb 12, 2000, 4:25 AM EST
In force: 47 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Whole counties

Counties Haywood County, NC, Jackson County, NC

The radar

The Knoxville radar (KMRX), 89 km from the middle of the area, began a volume at 08:37 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 8.6 hours before the alert went out and 264 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 55 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1002 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 165 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.

000 
WUUS52 KGSP 120839
SVRGSP
NCC087-099-120925-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
338 AM EST SAT FEB 12 2000

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JACKSON COUNTY IN WESTERN NORTH CAROLINA
  SOUTHERN HAYWOOD COUNTY IN WESTERN NORTH CAROLINA

* UNTIL 425 AM EST

* AT 335 AM...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
  THUNDERSTORM 5 MILES WEST OF WAYNESVILLE TO 3 MILES EAST OF
SYLVA..
  .MOVING EAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WAYNESVILLE AT 340 AM
  SUNBURST AT 350 AM

$$
PAT

 
N

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Greenville-Spartanburg, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Feb 12, 1:35 AM EST, 2 hours 3 minutes earlier.

Area forecast discussion, Feb 12, 1:35 AM EST, 2 hours 3 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
135 AM EST SAT FEB 12 2000

PRIMARY FORECAST CONCERN THIS PACKAGE IS POSSIBILITY OF STRONG
CONVECTION TDA...AND TEMPS W/REMAINS OF WEDGE-RIDGE ON SUN.

AN IMPRESSIVE AREA OF ELEVATED CONVECTION IS APPROACHING THE CWA FROM
THE W/THIS MORNING. THIS TSRA IS IN THE NOSE OF A STRONG THETA E
AXIS AND IN THE HEART OF STRONG WAA ON THE I294 SFC ON THE ETA. THE
AREA OF UPGLIDE ONLY STRENGTHENS OVER THE WRN CWA AS WE APPROACH
12Z...HELPED BY STRONG AGEO MOTION WITH A COUPLED JET. THE MAIN
VORT...INTERESTINGLY...WL LAG THE BEST WAA AND H3 DYNAMICS BY A
GOOD SIX HOURS. WET BULB ZERO AT FFC AT 00Z WAS ABOUT 8500 FEET...
SO WE REALLY DO NOT NEED THE CAA ALOFT THE VORT WOULD IMPART.

BY 18Z...AS THE VORT CROSSES THE CWA...MOISTURE IS STILL RATHER DEEP
WITH LOCAL POP SCHEME GIVING ABOUT A 70 POP FOR THE AFTERNOON.
UPGLIDE ALSO STILL CONTINUES...THOUGH IS NOT AS STRONG AS WE LOSE
THE AGEO COMPONENT INTRODUCED BY THE RETREATING COUPLED JET. THE
QUESTION IS...HOW FAR S WL THE WEDGE RIDGE PUSH BY EARLY AFTN. 06Z
SFC MAP SHOWS RISES OF 2 TO 3 MB OVER THE MID ATLANTIC STATES...NOT
AS HIGH AS I/D LIKE TO SEE TO PUSH RIDGE THOUGH THE ENTIRE CWA.
STILL...THE ETA HAS MOST NON MTN AREAS IN ELY FLOW BY AFTN...AS THE
RUC DOES BY 15Z. THUS...THREAT FOR STUFF ROOTED IN THE BNDRY LAYER
IN THE EARLY AFTN NOT TOO HIGH.

WL KEEP MENTION OF TSRA IN ALL ZONES TDA. PCPN SHOULD TAPER OFF
SOME IN THE AFTN...PARTICULARLY NRN CWA. NOT SURE HOW TO WORD THAT
YET...BUT WL AT LEAST START W/CAT POPS EVERYWHERE. MAY MENTION SOME
W/LARGE HAIL IN THE SRN TIER OF ZONES AND MTNS.

WE WON/T SCOUR OVERNIGHT...SO WHATEVER WE FALL TO BY LATE AFTN
SHOULD BE ABOUT IT FOR LOWS. WL FOLLOW THE ETA SFC WET-BULBS FOR
THIS...WHICH ARE FAIRLY CLOSE TO RAFS. AS FOR P-TYPE PROBLEM. ETA
1000-850 THICKNESS NEVER FALL TO BELOW 1320 TDA...SO NOT CONCERNED
ABOUT THAT.

WHETHER WE WL SCOUR ON SUN IS A TOUGH CALL. THE PREVIOUS SHIFT DIDN/T
THINK SO AND WENT WELL BELOW MOS NUMBERS. H8 FLOW BECOMES QUITE
STRONG OUT OF THE SW BY AFTN...AND EVEN THE ETA LOSES THE WEDGE
RIDGE...ALBEIT LATE. THEN THERE IS THE PROBLEM OF A FEW SHOWERS IN
WAA AHEAD OF NEXT...STRONG SHORT WAVE. WL GO COOLER THAN MOS...BUT
A COUPLE CATS WARMER THAN PREVIOUS SHIFT.

LOOKS LIKE A STRONG MCS SUN NGHT AND EARLY MON. WL PUT MENTION OF
TSRA IN FIRST AND SECOND PERIOD OF THE EXTENDED AS A RESULT. PCPN MAY
BE MOSTLY OVER MON IF AVN TIMING IS RIGHT...BUT WON/T GET THAT
SPECIFIC ATTM.

PRELIMINARY NUMBERS:

AVL 46/36/55 823
CLT 48/38/52 922
GSP 50/40/53 823

.GSP...NONE.

MCAVOY

Nearby

Severe Thunderstorm Warnings in North Carolina, 2000 Every severe thunderstorm warning in 2000

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.