Alert archive / North Carolina / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 690, NWS Greenville-Spartanburg, SC

September 27, 2011York County, South Carolina; Cabarrus County, Mecklenburg County, Union County, North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Sep 27, 2011, 8:30 PM EDT for York County, South Carolina; Cabarrus County, Mecklenburg County, Union County, North Carolina. It was in force for 60 min. 4 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: Sep 27, 2011, 8:30 PM EDT (00:30 UTC)
Expired: Sep 27, 2011, 9:30 PM EDT
In force: 60 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon

Counties Cabarrus County, NC, Mecklenburg County, NC, Union County, NC, York County, SC

The radar

The Columbia radar (KCAE), 130 km from the middle of the area, began a volume at 00:34 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

Time	Report	Where	Remark
Sep 27, 8:58 PM EDT	TSTM WND DMG	4 Wnw Mint Hill, NC	1 TREE DOWN ON BLYTHWOOD LANE AND 1 TREE DOWN ON WILD HONEY LANE WNW OF MINT HILL.
Sep 27, 9:28 PM EDT	TSTM WND DMG	Concord, NC	PART OF A ROOF BLOWN OFF OF AN OLD CONVERTED TEXTILE MILL.
Sep 27, 9:34 PM EDT	TSTM WND DMG	Concord, NC	TREES DOWN NEAR INTERSECTION OF MCGILL AVE AND KERR ST.
Sep 27, 9:36 PM EDT	HAIL 0.75	Concord, NC	UP TO PENNY SIZED HAIL IN CONCORD.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 28 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 0.5 hours before the alert went out and 134 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: 660 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1352 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

780 
WUUS52 KGSP 280030
SVRGSP
NCC025-119-179-SCC091-280130-
/O.NEW.KGSP.SV.W.0690.110928T0030Z-110928T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
830 PM EDT TUE SEP 27 2011

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CABARRUS COUNTY IN THE PIEDMONT OF NORTH CAROLINA...
  MECKLENBURG COUNTY IN THE PIEDMONT OF NORTH CAROLINA...
  WESTERN UNION COUNTY IN THE PIEDMONT OF NORTH CAROLINA...
  SOUTHEASTERN YORK COUNTY IN UPSTATE SOUTH CAROLINA...

* UNTIL 930 PM EDT

* AT 826 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 4 MILES
  SOUTH OF FORT MILL...OR 4 MILES EAST OF ROCK HILL...MOVING
  NORTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  FORT MILL AND TEGA CAY...
  CAROWINDS AND MINERAL SPRINGS...
  PINEVILLE AND WEDDINGTON...
  SOUTHPARK MALL AND STALLINGS...
  MATTHEWS...
  CENTER CITY CHARLOTTE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PEOPLE IN THE PATH OF THIS SEVERE THUNDERSTORM 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 3519 8050 3517 8046 3517 8042 3481 8072
      3482 8080 3494 8079 3505 8089 3501 8090
      3495 8086 3484 8087 3494 8109 3549 8072
      3534 8040
TIME...MOT...LOC 0030Z 212DEG 24KT 3497 8093

$$

RWH

2 follow-up statements

207 
WWUS52 KGSP 280052
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
852 PM EDT TUE SEP 27 2011

SCC091-280102-
/O.CAN.KGSP.SV.W.0690.000000T0000Z-110928T0130Z/
YORK SC-
852 PM EDT TUE SEP 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL YORK COUNTY IS
CANCELLED...

THE STORM THAT PROMPTED THE WARNING HAS MOVED NORTH OF YORK COUNTY. 

LAT...LON 3519 8050 3517 8046 3517 8042 3481 8072
      3482 8080 3494 8079 3511 8094 3507 8100
      3549 8072 3534 8040
TIME...MOT...LOC 0052Z 212DEG 24KT 3510 8081

$$

NCC025-119-179-280130-
/O.CON.KGSP.SV.W.0690.000000T0000Z-110928T0130Z/
CABARRUS NC-MECKLENBURG NC-UNION NC-
852 PM EDT TUE SEP 27 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR WESTERN UNION...MECKLENBURG AND CABARRUS COUNTIES IN THE PIEDMONT
OF NORTH CAROLINA...

AT 850 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED 4 MILES EAST OF PINEVILLE...OR 10 MILES SOUTH OF CENTER CITY
CHARLOTTE...MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  INDIAN TRAIL...
  SOUTHPARK MALL AND MATTHEWS...
  CENTER CITY CHARLOTTE...
  EASTLAND MALL AND MINT HILL...
  FAIRVIEW...
  UNC CHARLOTTE...

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 3519 8050 3517 8046 3517 8042 3481 8072
      3482 8080 3494 8079 3511 8094 3507 8100
      3549 8072 3534 8040
TIME...MOT...LOC 0052Z 212DEG 24KT 3510 8081

$$

RWH

794 
WWUS52 KGSP 280114
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
914 PM EDT TUE SEP 27 2011

NCC179-280124-
/O.CAN.KGSP.SV.W.0690.000000T0000Z-110928T0130Z/
UNION NC-
914 PM EDT TUE SEP 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN UNION COUNTY IN THE
PIEDMONT OF NORTH CAROLINA IS CANCELLED...

THE STORM THAT PROMPTED THE WARNING WILL REMAIN WEST OF UNION COUNTY.

LAT...LON 3521 8048 3519 8050 3521 8055 3512 8067
      3515 8076 3522 8082 3528 8087 3531 8084
      3549 8072 3534 8040
TIME...MOT...LOC 0114Z 212DEG 24KT 3525 8070

$$

NCC025-119-280130-
/O.CON.KGSP.SV.W.0690.000000T0000Z-110928T0130Z/
CABARRUS NC-MECKLENBURG NC-
914 PM EDT TUE SEP 27 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR EASTERN MECKLENBURG AND CABARRUS COUNTIES...

AT 910 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED 3 MILES NORTHEAST OF EASTLAND MALL...OR 5 MILES SOUTH OF UNC
CHARLOTTE...MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  UNC CHARLOTTE...
  HARRISBURG...CHARLOTTE MOTOR SPEEDWAY AND MIDLAND...
  CONCORD...

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 3521 8048 3519 8050 3521 8055 3512 8067
      3515 8076 3522 8082 3528 8087 3531 8084
      3549 8072 3534 8040
TIME...MOT...LOC 0114Z 212DEG 24KT 3525 8070

$$

RWH

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 Sep 27, 6:28 PM EDT, 2 hours 2 minutes earlier.

Area forecast discussion, Sep 27, 6:28 PM EDT, 2 hours 2 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
628 PM EDT TUE SEP 27 2011

.SYNOPSIS...
A WEAK COLD FRONT WILL CONTINUE PUSHING EAST TOWARD THE CAROLINA
COASTAL PLAIN WEDNESDAY. A STRONGER COLD FRONT WILL PUSH ACROSS THE
REGION ON FRIDAY AND BRING A COOLER AND DRIER CANADIAN AIR MASS IN
FOR THE WEEKEND.

&&

.NEAR TERM /THROUGH WEDNESDAY/...
A FEW DIURNALLY FIRED THUNDERSTORMS MAY DEVELOP ACRS THE LOWER
PIEDMONT...WITHIN THE NORTHERN PERIPHERY OF THE GREATER INSTABILITY
PLUME. OTHERWISE...PARTLY CLOUDY CONDITIONS WILL BE SEEN ALONG AND
NW OF THE I-85 CORRIDOR INTO THE EVENING. WED MORNING MIN TEMPS ARE
SLATED TO BE A CATEGORY OR TWO ABOVE CLIMO. INSTABILITY BUBBLES UP
AGAIN SE OF I-85 WEDNESDAY AFTERNOON LEADING TO SOME NON-ZERO
PROBABILITY OF DEEP CONVECTIVE DEVELOPMENT. THE SAME CAN BE SAID FOR
THE MTNS WHERE CHANNEL VORT ENERGY RIPPLES THRU WITHIN THE LINGERING
CYCLONIC FLOW ALOFT. ANOTHER WARM AFTERNOON IS ON TAP FEATURING MAX
TEMPS 5-7 DEG F ABOVE NORMAL.

&&

.SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/...
AS OF 210 PM TUESDAY...UPPER LOW WILL MOVE ACROSS THE S GREAT LAKES
WED NIGHT-THU WITH AN ASSOC SHORTWAVE BRUSHING THE N CWA. THERE
SHOULD BE ENOUGH MOISTURE AND INSTABILITY FOR SLIGHT CHC POPS OVER
THE NC MOUNTAINS INTO THU MRNG. SYSTEM MOVES QUICKLY NE OF THE AREA
THU AFTN AS THE NEXT SHORTWAVE AND COLD FRONT DROP SE INTO THE CWA.
STILL SEE VERY LITTLE MOISTURE WITH THIS SYSTEM BUT KEPT SLIGHT CHC
POPS OVER THE MTNS...MAINLY THE N NC MTNS LATE THU INTO THU NIGHT.
TEMPS WILL BE ABOUT 5 DEG ABOVE AVG THU...NEAR AVG FRI. LOWS WILL BE
SLIGHTLY ABOVE AVG WED NIGHT...AROUND AVG THU NIGHT.

&&

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
AS OF 140 PM TUESDAY...GOOD CONFIDENCE IS HAD IN THE EXT RANGE AS THE
LONGWAVE PATTERN BECOMES MORE CLIMATOLOGICALLY FAVORED AND WELL AGREED
UPON BY THE MODELS. A STRONG AND HIGH MAGNITUDE UPPER RIDGE LOOKS TO
DEVELOP ACROSS THE ROCKIES AND WILL SHIFT EAST OVER THE FCST AREA
THROUGH THE PERIOD. THE BROAD UPPER TROF WILL BE REPLACED BY 592DM
HIGH ACCORDING TO THE 12Z GFS AND BY A STRONG SUBSIDENCE ZONE
DEPICTED BY THE 00Z ECMWF. IN EITHER CASE...THE PATTERN SHOULD BE
DRY THROUGH A DEEP LAYER AND NO POPS HAVE BEEN INTRODUCED TO THE EXT
RANGE GRIDS.

THE BIG THING WILL BE THE AIRMASS CHANGE. THE OP MODELS SHOW A
DEFINITE CP THETA/E AIRMASS FILTERING INTO THE CWFA BEGINNING EARLY
SAT AND CONTINUED FLUX THROUGH EARLY SUN...BEFORE MODIFYING IN GOOD
INSOLATION CONDITIONS. THIS WILL HELP TO KEEP MAX TEMPS ABOUT 10
DEGREES BELOW NORMAL SAT AND SUN...THEN A COUPLE CATS WARMER MON/TUE
BUT STILL BELOW NORMAL. MIN TEMPS WILL DROP TO THEIR LOWEST LEVELS
OF THE SEASON WITH LOWS ABOUT 20 DEGREES BELOW NORMAL...PERHAPS NEAR
RECORD LEVELS IN VERY GOOD RADIATIONAL COOLING CONDITIONS SAT AND SUN
NIGHTS. THIS WILL ALSO CREATE A FROST CONCERN ACROSS THE HIGHER
ELEVATIONS. RIGHT NOW...MINS AND TDD/S LOOK A LITTLE TOO WARM FOR A
WIDESPREAD FROST ISSUE...BUT THE HIGHEST NC MTN PEAKS WILL HAVE A
DECENT CHANCE OF EARLY MORNING FROST FORMATION. THIS SCENARIO COULD
CHANGE DEPENDING ON THE TRUE CHARACTER OF THE INCOMING AIRMASS...SO
FOLKS WITH FROST CONCERNS SHOULD MONITOR THE MOST CURRENT FORECASTS
AS THE WEEKEND NEARS.

&&

.AVIATION /00Z WEDNESDAY THROUGH SUNDAY/...
AT KCLT...LIGHT SW WINDS AND JUST SOME MID-LVL CLOUDS THIS EVENING.
THERE COULD BE PATCHY MVFR BR DEVELOPMENT ACRS THE PIEDMONT LATER
TONIGHT...BUT NOT SURE IF VSBY AT THE TERMINAL WILL DIP BELOW VFR
OR NOT. SW WINDS SHOULD INCREASE TO ABT 10 KTS WED AFTERNOON AS VFR
LVL CU DEVELOPS.

ELSEWHERE...FAIR TONIGHT WITH DEVELOPING PATCHY MVFR FOG ACRS THE
FTHLS/PIEDMONT AND LOCALLY DENSE IN THE MTN VALLEYS. SUNSHINE WILL
MIX WITH DEVELOPING CU ON WEDNESDAY.

OUTLOOK....GRADUAL DRYING WILL CONTINUE INTO LATE WEEK. ANOTHER COLD
FRONT WILL ARRIVE ON FRIDAY...BUT MOSTLY DRY.

AN EXPERIMENTAL AVIATION FORECAST CONSISTENCY TABLE SHOWING THE
PERCENTAGE OF GUIDANCE MEMBERS AGREEING WITH THE SCHEDULED ISSUANCE
CATEGORY IS AVAILABLE AT FOLLOWING LINK (USE LOWER CASE)...

WWW.WEATHER.GOV/GSP/AVIATION/TABLES.HTM

&&

.GSP WATCHES/WARNINGS/ADVISORIES...
GA...NONE.
NC...NONE.
SC...NONE.

&&

SYNOPSIS...SBK
NEAR TERM...CSH/JAT
SHORT TERM...RB
LONG TERM...SBK
AVIATION...CSH/JAT

Hazardous weather outlook, Sep 27, 4:41 PM EDT, 3 hours 49 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
441 PM EDT TUE SEP 27 2011

GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065-
068>072-082-501>510-SCZ001>014-019-282045-
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-
441 PM EDT TUE SEP 27 2011

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

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

NONE.

In the hours before

Special weather statement, Sep 27, 8:11 PM EDT, 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
811 PM EDT TUE SEP 27 2011

SCZ012-019-280100-
GREENWOOD-LAURENS-
811 PM EDT TUE SEP 27 2011

...A STRONG THUNDERSTORM WILL AFFECT GREENWOOD AND SOUTHERN LAURENS
COUNTIES THROUGH 900 PM EDT...

AT 810 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 3 MILES SOUTHEAST OF CALLISON...OR 14 MILES SOUTH
OF GREENWOOD...MOVING NORTHEAST AT 20 MPH.

THIS STORM WILL BE NEAR...
  GREENWOOD...
  NINETY SIX...
  LAKE GREENWOOD...
  CROSS HILL...

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

FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY
AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF
POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID
USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY
ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.

LAT...LON 3398 8205 3397 8219 3401 8224 3399 8228
      3406 8233 3411 8227 3415 8224 3436 8192
      3431 8187 3430 8189 3420 8194 3418 8190
      3413 8187 3398 8199 3395 8204

RWH

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 27, 8:11 PM EDT	Special Weather Statement	GSP	Greenwood	49 min
Sep 27, 10:29 PM EDT	Special Weather Statement	GSP	Chester	61 min
Sep 27, 9:26 PM EDT	Severe Thunderstorm Warning	GSP	Cabarrus, Rowan	64 min
Sep 27, 10:50 PM EDT	Areal Flood Advisory	GSP	Cabarrus	3 hr
Sep 27, 10:59 PM EDT	Areal Flood Advisory	GSP	Mecklenburg	3 hr

Nearby

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