Alert archive / North Carolina / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Greenville-Spartanburg, SC

April 4, 2011Graham County, Swain County, North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Apr 4, 2011, 9:50 PM EDT for Graham County, Swain County, North Carolina. It was in force for 55 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Apr 4, 2011, 9:50 PM EDT (01:50 UTC)
Expired
Apr 4, 2011, 10:45 PM EDT
In force
55 min
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon

Counties Graham County, NC, Swain County, NC

The radar

The Knoxville radar (KMRX), 84 km from the middle of the area, began a volume at 01:52 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.

What was reported inside it

TimeReportWhereRemark
Apr 4, 10:00 PM EDTTSTM WND DMGRobbinsville, NCGRAHAM COUNTY COMMS REPORTS MULTIPLE TREES THROUGHOUT THE COUNTY.
Apr 4, 10:25 PM EDTTSTM WND DMG3 Wsw Bryson City, NCSWAIN COUNTY REPORTS MULTIPLE TREES DOWN THROUGHOUT THE COUNTY. MOST OF THEM ARE IN THE AREA BETWEEN FONTANA LAKE AND BRYSON CITY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 4, 9:45 PM EDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 1.8 hours before the alert went out and 243 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, Peachtre/Fal Fld, GA at 00:00Z on 2011-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 176 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, Peachtre/Fal Fld, GA at 00:00Z on 2011-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 158 square meters per square second.19395878Sfc1 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
176 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1790 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
158 m²/s²
0-3 km storm-relative helicity
251 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

705 
WUUS52 KGSP 050150
SVRGSP
NCC075-173-050245-
/O.NEW.KGSP.SV.W.0021.110405T0150Z-110405T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
950 PM EDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GRAHAM COUNTY IN WESTERN NORTH CAROLINA...
  SWAIN COUNTY IN WESTERN NORTH CAROLINA...

* UNTIL 1045 PM EDT

* AT 947 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 15 MILES NORTH OF TAPOCO TO 17
  MILES SOUTHWEST OF SANTEETLAH LAKE...OR ALONG A LINE EXTENDING FROM
  9 MILES SOUTHEAST OF MARYVILLE TO 8 MILES NORTHWEST OF MURPHY...
  MOVING NORTHEAST AT 60 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SANTEETLAH...FONTANA VILLAGE...ROBBINSVILLE...STECOAH...FONTANA
  LAKE...WESSER...ALMOND...LUADA...ALARKA...BRYSON CITY...CHEROKEE...
  NEWFOUND GAP AND SMOKEMONT

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PEOPLE IN THE PATH OF THIS LINE OF SEVERE THUNDERSTORMS SHOULD BE
ALERT FOR LARGE HAIL AND DAMAGING WINDS. FREQUENT LIGHTNING AND
LOCALLY HEAVY RAIN CAN OCCUR WITH ANY THUNDERSTORM. SEEK SHELTER
INDOORS AWAY FROM WINDOWS AND DOORS UNTIL THE STORM PASSES.

TO REPORT DAMAGING WINDS...LARGE HAIL...OR FLOODING...THROUGH OUR
AUTOMATED REPORTING SYSTEM...CALL OUR TOLL FREE NUMBER...
1 8 7 7...6 3 3...6 7 7 2.

&&

LAT...LON 3540 8403 3553 8388 3553 8383 3557 8377
      3557 8349 3567 8334 3566 8330 3569 8327
      3568 8320 3550 8327 3546 8336 3537 8334
      3529 8357 3528 8368 3524 8373 3525 8384
      3521 8396 3523 8401 3531 8404
TIME...MOT...LOC 0150Z 233DEG 50KT 3567 8382 3522 8406

$$
07
2 follow-up statements
079 
WWUS52 KGSP 050211
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1011 PM EDT MON APR 4 2011

NCC075-173-050245-
/O.CON.KGSP.SV.W.0021.000000T0000Z-110405T0245Z/
GRAHAM NC-SWAIN NC-
1011 PM EDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR SWAIN AND EASTERN GRAHAM COUNTIES...

AT 1010 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM 7 MILES NORTH OF FONTANA
LAKE TO ROBBINSVILLE...OR ALONG A LINE EXTENDING FROM 16 MILES NORTH
OF ROBBINSVILLE TO ANDREWS...MOVING NORTHEAST AT 55 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
STECOAH...WESSER...ALMOND...LUADA...ALARKA...BRYSON CITY...NEWFOUND
GAP AND SMOKEMONT

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PEOPLE IN THE PATH OF THIS STORM SHOULD BE ALERT FOR LARGE HAIL AND
DAMAGING WINDS. FREQUENT LIGHTNING AND LOCALLY HEAVY RAIN CAN OCCUR
WITH ANY THUNDERSTORM. SEEK SHELTER INDOORS AWAY FROM WINDOWS AND
DOORS UNTIL THE STORM PASSES.

&&

LAT...LON 3557 8377 3557 8349 3567 8334 3566 8330
      3569 8327 3568 8320 3551 8327 3546 8336
      3537 8334 3529 8357 3528 8368 3524 8373
      3525 8385
TIME...MOT...LOC 0211Z 233DEG 50KT 3555 8371 3526 8377

$$

07
660 
WWUS52 KGSP 050235
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1035 PM EDT MON APR 4 2011

NCC075-050245-
/O.CAN.KGSP.SV.W.0021.000000T0000Z-110405T0245Z/
GRAHAM NC-
1035 PM EDT MON APR 4 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN GRAHAM COUNTY IS
CANCELLED...

LAT...LON 3557 8349 3567 8334 3566 8330 3569 8327
      3568 8320 3551 8327 3546 8336 3541 8336
      3541 8335 3537 8334 3529 8358
TIME...MOT...LOC 0235Z 233DEG 50KT 3574 8337 3545 8344

$$

NCC173-050245-
/O.CON.KGSP.SV.W.0021.000000T0000Z-110405T0245Z/
SWAIN NC-
1035 PM EDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR EASTERN SWAIN COUNTY...

AT 1030 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60
MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES
NORTH OF NEWFOUND GAP TO LUADA...OR ALONG A LINE EXTENDING FROM
GATLINBURG TO BRYSON CITY...MOVING NORTHEAST AT 55 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SMOKEMONT

LAT...LON 3557 8349 3567 8334 3566 8330 3569 8327
      3568 8320 3551 8327 3546 8336 3541 8336
      3541 8335 3537 8334 3529 8358
TIME...MOT...LOC 0235Z 233DEG 50KT 3574 8337 3545 8344

$$

KRENTZ

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 4, 9:55 PM EDTAreal Flood AdvisoryGSPGraham4 hr
Apr 4, 10:14 PM EDTSevere Thunderstorm WarningGSPJackson, Macon61 min
Apr 4, 10:42 PM EDTSevere Thunderstorm WarningGSPBuncombe, Haywood, Madison, Swain63 min
Apr 4, 11:06 PM EDTSevere Thunderstorm WarningGSPHenderson, Jackson, Macon, Transylvania54 min
Apr 4, 11:25 PM EDTSevere Thunderstorm WarningGSPAvery, Buncombe, Burke, Caldwell, McDowell, Madison and 2 more65 min
Apr 4, 11:43 PM EDTSevere Thunderstorm WarningGSPBuncombe, Burke, Caldwell, Henderson, McDowell, Polk and 1 more62 min
Apr 4, 11:52 PM EDTTornado WarningGSPBuncombe, Henderson, McDowell, Rutherford38 min
Apr 4, 11:59 PM EDTSevere Thunderstorm WarningGSPPolk46 min
Apr 5, 12:22 AM EDTSevere Thunderstorm WarningGSPAlexander, Burke, Caldwell, Catawba53 min
Apr 5, 12:28 AM EDTTornado WarningGSPBurke, Cleveland, Rutherford32 min
Apr 5, 12:46 AM EDTSevere Thunderstorm WarningGSPCleveland, Gaston, Polk, Rutherford59 min
Apr 5, 1:12 AM EDTSevere Thunderstorm WarningGSPBurke, Catawba, Cleveland, Iredell, Lincoln63 min
Apr 5, 1:14 AM EDTSevere Thunderstorm WarningGSPAlexander, Davie, Iredell61 min
Apr 5, 1:21 AM EDTSevere Thunderstorm WarningGSPCleveland, Gaston, Lincoln, Mecklenburg54 min
Apr 5, 1:29 AM EDTTornado WarningGSPCatawba, Lincoln27 min
Apr 5, 1:44 AM EDTSevere Thunderstorm WarningGSPCatawba, Davie, Iredell, Rowan61 min
Apr 5, 1:53 AM EDTSevere Thunderstorm WarningGSPCabarrus, Mecklenburg, Union67 min
Apr 5, 4:08 AM EDTFrost AdvisoryGSPAlexander, Burke, Cabarrus, Caldwell, Catawba, Cleveland and 10 more29 hr
Apr 5, 4:08 AM EDTFreeze WarningGSPAvery, Buncombe, Burke, Caldwell, Graham, Haywood and 11 more29 hr

Nearby

Severe Thunderstorm Warnings in North Carolina, 2011Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.