Alert archive / North Carolina / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 432, NWS Greenville-Spartanburg, SC

June 20, 20114 counties in North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Jun 20, 2011, 4:17 AM EDT for 4 counties in North Carolina. It was in force for 58 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: Jun 20, 2011, 4:17 AM EDT (08:17 UTC)
Expired: Jun 20, 2011, 5:15 AM EDT
In force: 58 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon

Counties Avery County, NC, Madison County, NC, Mitchell County, NC, Yancey County, NC

The radar

The Knoxville radar (KMRX), 104 km from the middle of the area, began a volume at 08:18 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, 8.3 hours before the alert went out and 214 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: 18 J/kg
Mixed-layer CIN: -370 J/kg
Mixed-layer LCL: 1794 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jun 20, 3:17 AM EDT, 1 hour earlier.

Area forecast discussion, Jun 20, 3:17 AM EDT, 1 hour before

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Hazardous weather outlook, Jun 20, 3:48 AM EDT, 29 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
348 AM EDT MON JUN 20 2011

GAZ010-017-018-026-028-029-NCZ035>037-053-056-057-059-062>065-
068>072-082-501>510-SCZ001>014-019-210800-
RABUN-HABERSHAM-STEPHENS-FRANKLIN-HART-ELBERT-ALEXANDER-IREDELL-
DAVIE-BUNCOMBE-CATAWBA-ROWAN-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-
348 AM EDT MON JUN 20 2011

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

.DAY ONE...TODAY AND TONIGHT.

THUNDERSTORMS WILL MOVE SOUTHEAST OUT OF TENNESSEE INTO THE
MOUNTAINS OF NORTH CAROLINA EARLY THIS MORNING AND MAINLY SPREAD
INTO THE FOOTHILLS AND POSSIBLY THE PIEDMONT. SOME OF THESE
STORMS WILL BE SEVERE WITH DAMAGING WINDS AND LARGE HAIL.

ALTHOUGH THESE STORMS WILL DIMINISH OR MOVE EAST OF THE AREA LATER
THIS MORNING...ADDITIONAL THUNDERSTORMS WILL DEVELOP ACROSS THE
AREA THIS AFTERNOON. DAMAGING WINDS AND LARGE HAIL WILL ALSO BE
THE MAIN THREAT WITH THESE STORMS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

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

NCZ033-048>052-058-210800-
AVERY-MADISON-YANCEY-MITCHELL-SWAIN-HAYWOOD-GRAHAM-
348 AM EDT MON JUN 20 2011

...FLASH FLOOD WATCH IN EFFECT UNTIL 6 AM EDT EARLY THIS MORNING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN NORTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   FLASH FLOOD WATCH.

THUNDERSTORMS WILL MOVE SOUTHEAST OUT OF TENNESSEE INTO THE
MOUNTAINS OF NORTH CAROLINA EARLY THIS MORNING AND MAINLY SPREAD
INTO THE FOOTHILLS AND POSSIBLY THE PIEDMONT. SOME OF THESE
STORMS WILL BE SEVERE WITH DAMAGING WINDS AND LARGE HAIL.

ALTHOUGH THESE STORMS WILL DIMINISH OR MOVE EAST OF THE AREA LATER
THIS MORNING...ADDITIONAL THUNDERSTORMS WILL DEVELOP ACROSS THE
AREA THIS AFTERNOON. DAMAGING WINDS AND LARGE HAIL WILL ALSO BE
THE MAIN THREAT WITH THESE STORMS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Local storm report, Jun 20, 1:29 AM EDT, 2 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
129 AM EDT MON JUN 20 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0107 AM     HAIL             PRINCETON               34.50N 82.29W
06/20/2011  E0.88 INCH       GREENVILLE         SC   PUBLIC

0110 AM     TSTM WND GST     BELTON                  34.52N 82.50W
06/20/2011  M54.00 MPH       ANDERSON           SC   PUBLIC

&&

RWH

Local storm report, Jun 20, 1:39 AM EDT, 2 hours 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
139 AM EDT MON JUN 20 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1203 AM     TSTM WND DMG     4 ESE BELTON            34.50N 82.44W
06/20/2011                   ANDERSON           SC   COUNTY OFFICIAL

            LARGE TREE DOWN ON ROCKY FORD ROAD. TIME DETERMINED BY
            RADAR.

&&

NED

Local storm report, Jun 20, 1:43 AM EDT, 2 hours 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
143 AM EDT MON JUN 20 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0103 AM     TSTM WND DMG     1 NE ANDERSON           34.53N 82.63W
06/20/2011                   ANDERSON           SC   COUNTY OFFICIAL

            TREE BLOCKING SIMPSON ROAD. TIME DETERMINED BY RADAR.

&&

NED

Local storm report, Jun 20, 1:44 AM EDT, 2 hours 33 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
144 AM EDT MON JUN 20 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0103 AM     TSTM WND DMG     4 ESE BELTON            34.50N 82.44W
06/20/2011                   ANDERSON           SC   COUNTY OFFICIAL

            LARGE TREE DOWN ON ROCKY FORD ROAD. TIME DETERMINED BY
            RADAR.

&&

NED

Local storm report, Jun 20, 1:57 AM EDT, 2 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
157 AM EDT MON JUN 20 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0141 AM     TSTM WND DMG     3 ESE ABBEVILLE         34.17N 82.32W
06/20/2011                   ABBEVILLE          SC   COUNTY OFFICIAL

            ONE TREE DOWN ON OLD ABBEVILLE HIGHWAY. TIME DETERMINED
            BY RADAR.

&&

NED

Local storm report, Jun 20, 3:38 AM EDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
338 AM EDT MON JUN 20 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1233 AM     TSTM WND DMG     SALEM                   34.89N 82.98W
06/20/2011                   OCONEE             SC   LAW ENFORCEMENT

            TREES DOWN.

1233 AM     TSTM WND DMG     SALEM                   34.89N 82.98W
06/20/2011                   OCONEE             SC   LAW ENFORCEMENT

            METAL ROOF OFF HOUSE

1229 AM     TSTM WND DMG     3 WSW SALEM             34.87N 83.03W
06/20/2011                   OCONEE             SC   LAW ENFORCEMENT

            TREES DOWN

&&

07

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 10:47 PM EDT	Severe Thunderstorm Warning	GSP	Graham, Swain	43 min
Jun 19, 10:52 PM EDT	Special Weather Statement	GSP	Madison, Yancey	38 min
Jun 19, 10:57 PM EDT	Severe Thunderstorm Warning	GSP	Buncombe, McDowell, Madison, Yancey	49 min
Jun 19, 11:14 PM EDT	Severe Thunderstorm Warning	GSP	Macon, Swain	46 min
Jun 19, 11:46 PM EDT	Special Weather Statement	GSP	Jackson, Transylvania	44 min
Jun 19, 11:55 PM EDT	Severe Thunderstorm Warning	GSP	Jackson, Macon, Transylvania	50 min
Jun 20, 5:05 AM EDT	Severe Thunderstorm Warning	GSP	Buncombe, Haywood, Henderson, Jackson, Transylvania	55 min
Jun 20, 8:52 AM EDT	Special Weather Statement	GSP	Avery, Buncombe, Burke, Caldwell, McDowell, Madison and 2 more	38 min
Jun 20, 10:47 AM EDT	Special Weather Statement	GSP	Avery, Mitchell, Yancey	58 min
Jun 20, 11:21 AM EDT	Special Weather Statement	GSP	Avery, Mitchell, Yancey	24 min
Jun 20, 12:31 AM EDT	Severe Thunderstorm Warning	GSP	Anderson, Greenville, Oconee, Pickens	44 min
Jun 20, 12:57 AM EDT	Severe Thunderstorm Warning	GSP	Abbeville, Anderson, Greenville, Greenwood, Laurens	63 min
Jun 20, 1:37 AM EDT	Severe Thunderstorm Warning	GSP	Abbeville, Greenwood	52 min
Jun 20, 12:12 AM EDT	Special Weather Statement	GSP	Rabun, Stephens	48 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2011 Every severe thunderstorm warning in 2011

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.