Alert archive / North Carolina / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 530, NWS Greenville-Spartanburg, SC

August 9, 2012Haywood County, Jackson County, Swain County, North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Aug 9, 2012, 2:49 PM EDT for Haywood County, Jackson County, Swain County, North Carolina. It was in force for 56 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: Aug 9, 2012, 2:49 PM EDT (18:49 UTC)
Expired: Aug 9, 2012, 3:45 PM EDT
In force: 56 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon

Counties Haywood County, NC, Jackson County, NC, Swain County, NC

The radar

The Knoxville radar (KMRX), 83 km from the middle of the area, began a volume at 18:48 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 12:00Z, 6.8 hours before the alert went out and 259 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: 2486 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 661 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

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 Aug 9, 2:39 PM EDT, 10 minutes earlier.

Area forecast discussion, Aug 9, 2:39 PM EDT, 10 minutes before

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Hazardous weather outlook, Aug 9, 2:43 PM EDT, 6 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
243 PM EDT THU AUG 9 2012

GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065-
068>072-082-501>510-SCZ001>014-019-101845-
RABUN-HABERSHAM-STEPHENS-FRANKLIN-HART-ELBERT-AVERY-ALEXANDER-
IREDELL-DAVIE-MADISON-YANCEY-MITCHELL-SWAIN-HAYWOOD-BUNCOMBE-CATAWBA-
ROWAN-GRAHAM-NORTHERN JACKSON-MACON-SOUTHERN JACKSON-TRANSYLVANIA-
HENDERSON-CLEVELAND-LINCOLN-GASTON-MECKLENBURG-CABARRUS-UNION NC-
CALDWELL MOUNTAINS-GREATER CALDWELL-BURKE MOUNTAINS-GREATER BURKE-
MCDOWELL MOUNTAINS-EASTERN MCDOWELL-RUTHERFORD MOUNTAINS-
GREATER RUTHERFORD-POLK MOUNTAINS-EASTERN POLK-OCONEE MOUNTAINS-
PICKENS MOUNTAINS-GREENVILLE MOUNTAINS-GREATER OCONEE-
GREATER PICKENS-GREATER GREENVILLE-SPARTANBURG-CHEROKEE-YORK-
ANDERSON-ABBEVILLE-LAURENS-UNION SC-CHESTER-GREENWOOD-
243 PM EDT THU AUG 9 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST GEORGIA...PIEDMONT
NORTH CAROLINA...WESTERN NORTH CAROLINA AND UPSTATE SOUTH CAROLINA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS THE
WESTERN CAROLINAS AND NORTHEAST GEORGIA FROM THE SOUTHWEST
THROUGH THE LATE AFTERNOON AND EVENING HOURS. SOME OF THESE
THUNDERSTORMS WILL BE CAPABLE OF PRODUCING LOCALLY DAMAGING WIND
GUSTS AND LARGE HAIL...ESPECIALLY SOUTHEAST OF THE INTERSTATE 85
CORRIDOR. THE THUNDERSTORMS WILL ALSO PRODUCE TORRENTIAL RAINFALL
AT RATES OF 1 TO 2 INCHES PER HOUR. EXCESSIVE RAINFALL COULD
RESULT IN LOCATIONS REPEATEDLY AFFECTED BY THUNDERSTORMS. ISOLATED
FLOODING IS POSSIBLE...ESPECIALLY OVER THE CENTRAL AND SOUTHERN
MOUNTAINS OF WESTERN NORTH CAROLINA.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

A STRONG COLD FRONT AND UPPER LEVEL DISTURBANCE WILL APPROACH THE
REGION ON FRIDAY. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS
ASSOCIATED WITH THE FRONT. DAMAGING WIND GUSTS WILL BE THE
PRIMARY THREAT...ESPECIALLY OVER FOOTHILL AND PIEDMONT LOCATIONS
FRIDAY AFTERNOON AND EVENING.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTERS ARE REQUESTED TO FORWARD ANY REPORTS OF LARGE
HAIL...DAMAGING WINDS...TORNADOES OR FLASH FLOODING TO OUR OFFICE.

GERAPETRITIS

In the hours before

Special weather statement, Aug 9, 1:39 PM EDT, 1 hour 10 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
139 PM EDT THU AUG 9 2012

NCZ051-058-091830-
GRAHAM-SWAIN-
139 PM EDT THU AUG 9 2012

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN GRAHAM AND WESTERN
SWAIN COUNTIES THROUGH 230 PM EDT...

AT 135 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR TAPOCO...OR 11 MILES NORTHWEST OF
ROBBINSVILLE...MOVING NORTHEAST AT 10 MPH.

THIS STORM WILL IMPACT LOCATIONS NEAR...
  FONTANA VILLAGE...

DIME SIZE HAIL...AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3542 8401 3545 8399 3548 8392 3553 8388
      3553 8383 3554 8380 3555 8379 3547 8371
      3535 8394 3541 8403

LANE

Special weather statement, Aug 9, 1:55 PM EDT, 54 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
155 PM EDT THU AUG 9 2012

NCZ065-091830-
HENDERSON-
155 PM EDT THU AUG 9 2012

...A STRONG THUNDERSTORM WILL AFFECT WESTERN HENDERSON COUNTY THROUGH
230 PM EDT...

AT 153 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR ETOWAH...OR 8 MILES WEST OF
HENDERSONVILLE...MOVING NORTH AT 10 MPH.

THIS STORM WILL IMPACT LOCATIONS NEAR...
  MOUNTAIN HOME...
  FLETCHER...

DIME SIZE HAIL...AND WIND GUSTS OF 40 TO 50 MPH ARE EXPECTED WITH
THIS STORM.

LAT...LON 3544 8263 3543 8258 3544 8255 3542 8254
      3544 8253 3545 8249 3526 8247 3524 8261
      3530 8262 3539 8271 3543 8274 3544 8272
      3545 8264

LANE

The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 8, 8:41 PM EDT	Flash Flood Warning	GSP	Union	3 hr
Aug 9, 1:39 PM EDT	Special Weather Statement	GSP	Graham	51 min
Aug 9, 1:55 PM EDT	Special Weather Statement	GSP	Henderson	35 min
Aug 9, 2:17 PM EDT	Areal Flood Advisory	GSP	Madison	103 min
Aug 9, 2:55 PM EDT	Severe Thunderstorm Warning	GSP	Buncombe, Henderson	46 min
Aug 9, 3:16 PM EDT	Severe Thunderstorm Warning	GSP	Haywood	59 min
Aug 9, 4:38 PM EDT	Special Weather Statement	GSP	Henderson	37 min
Aug 9, 4:51 PM EDT	Severe Thunderstorm Warning	GSP	Henderson, Polk	69 min
Aug 9, 6:18 PM EDT	Special Weather Statement	GSP	Rutherford	42 min
Aug 9, 6:41 PM EDT	Special Weather Statement	GSP	Burke	34 min
Aug 9, 6:46 PM EDT	Severe Thunderstorm Warning	GSP	Burke, Cleveland, McDowell, Rutherford	44 min
Aug 9, 6:59 PM EDT	Areal Flood Advisory	GSP	Caldwell	2 hr
Aug 9, 7:26 PM EDT	Flash Flood Warning	GSP	Caldwell	2 hr
Aug 9, 3:05 PM EDT	Severe Thunderstorm Warning	GSP	Abbeville, Greenwood, Laurens	55 min
Aug 9, 3:40 PM EDT	Severe Thunderstorm Warning	GSP	Anderson, Greenville, Laurens	65 min
Aug 9, 4:00 PM EDT	Severe Thunderstorm Warning	GSP	Anderson, Oconee	60 min
Aug 9, 4:11 PM EDT	Severe Thunderstorm Warning	GSP	Greenville, Spartanburg	79 min
Aug 9, 4:44 PM EDT	Special Weather Statement	GSP	Abbeville	46 min
Aug 9, 5:17 PM EDT	Special Weather Statement	GSP	Pickens	28 min
Aug 9, 5:33 PM EDT	Severe Thunderstorm Warning	GSP	Laurens	57 min
Aug 9, 5:57 PM EDT	Special Weather Statement	GSP	Abbeville	33 min
Aug 9, 6:22 PM EDT	Flash Flood Warning	GSP	Greenville	2 hr
Aug 9, 6:36 PM EDT	Special Weather Statement	GSP	Laurens	39 min
Aug 9, 7:11 PM EDT	Areal Flood Advisory	GSP	Laurens	109 min
Aug 9, 7:32 PM EDT	Special Weather Statement	GSP	Cherokee	28 min
Aug 9, 3:11 PM EDT	Special Weather Statement	GSP	Elbert	34 min
Aug 9, 3:51 PM EDT	Special Weather Statement	GSP	Hart	24 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2012 Every severe thunderstorm warning in 2012

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.