Alert archive / North Carolina / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 568, NWS Greenville-Spartanburg, SC

September 18, 20124 counties in North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Sep 18, 2012, 1:08 PM EDT for 4 counties in North Carolina. It was in force for 42 min. 1 report 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 18, 2012, 1:08 PM EDT (17:08 UTC)
Expired
Sep 18, 2012, 1:50 PM EDT
In force
42 min
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon

Counties Cabarrus County, NC, Iredell County, NC, Mecklenburg County, NC, Rowan County, NC

The radar

The Roanoke radar (KFCX), 159 km from the middle of the area, began a volume at 17:10 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
Sep 18, 1:20 PM EDTTSTM WND DMG3 S Concord, NCA LARGE TREE LIMB KNOCKED DOWN A POWER LINE ON MORRISON ROAD.

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 one storm report to this severe thunderstorm warning; the first came 12 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 12:00Z, 5.1 hours before the alert went out and 70 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, Greensboro/Hi Pt, NC at 12:00Z on 2012-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 533 joules per kilogram.LCLEL10008507005003002001001 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, Greensboro/Hi Pt, NC at 12:00Z on 2012-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 221 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
533 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
545 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
221 m²/s²
0-3 km storm-relative helicity
313 m²/s²
Significant tornado parameter
0.5
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

099 
WUUS52 KGSP 181708
SVRGSP
NCC025-097-119-159-181800-
/O.NEW.KGSP.SV.W.0568.120918T1708Z-120918T1800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
108 PM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CABARRUS COUNTY IN THE PIEDMONT OF NORTH CAROLINA...
  SOUTHEASTERN IREDELL COUNTY IN THE PIEDMONT OF NORTH CAROLINA...
  NORTH CENTRAL MECKLENBURG COUNTY IN THE PIEDMONT OF NORTH
  CAROLINA...
  ROWAN COUNTY IN THE PIEDMONT OF NORTH CAROLINA...

* UNTIL 200 PM EDT

* AT 106 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH. THIS STORM WAS LOCATED NEAR HUNTERSVILLE...OR 5 MILES
  NORTHWEST OF UNC CHARLOTTE...AND MOVING NORTHEAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL IMPACT LOCATIONS NEAR...
  KANNAPOLIS...CONCORD AND ENOCHVILLE.
  LANDIS AND CHINA GROVE.
  ROCKWELL AND GRANITE QUARRY.
  HIGH ROCK LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS CAPABLE OF BLOWING DOWN SCATTERED TREES AND POWER
LINES. SEEK SHELTER INSIDE AN INTERIOR ROOM.

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

&&

LAT...LON 3550 8029 3537 8037 3523 8078 3548 8094
      3579 8054 3578 8048 3574 8045 3573 8042
      3573 8034 3571 8032 3568 8033 3564 8029
      3564 8026 3558 8020 3550 8018
TIME...MOT...LOC 1708Z 238DEG 42KT 3538 8076

$$

JOH
2 follow-up statements
555 
WWUS52 KGSP 181731
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
131 PM EDT TUE SEP 18 2012

NCC119-181741-
/O.CAN.KGSP.SV.W.0568.000000T0000Z-120918T1800Z/
MECKLENBURG NC-
131 PM EDT TUE SEP 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MECKLENBURG
COUNTY IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THIS AREA.

LAT...LON 3550 8018 3550 8029 3537 8037 3530 8065
      3554 8081 3579 8054 3578 8049 3573 8042
      3573 8034 3571 8032 3568 8033 3564 8030
      3563 8025 3558 8020
TIME...MOT...LOC 1731Z 238DEG 42KT 3552 8048

$$

NCC025-097-159-181800-
/O.CON.KGSP.SV.W.0568.000000T0000Z-120918T1800Z/
CABARRUS NC-IREDELL NC-ROWAN NC-
131 PM EDT TUE SEP 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR ROWAN...
SOUTHEASTERN IREDELL AND CABARRUS COUNTIES UNTIL 200 PM EDT...

AT 128 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED 6 MILES EAST OF KANNAPOLIS...OR 8
MILES NORTHEAST OF CONCORD...MOVING NORTHEAST AT 50 MPH.

THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF CABARRUS...
ROWAN AND SOUTHEASTERN IREDELL COUNTIES...INCLUDING THE FOLLOWING
LOCATIONS...GRANITE QUARRY...GOLD HILL AND CRAVEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS CAPABLE OF BLOWING DOWN SCATTERED TREES AND POWER
LINES. SEEK SHELTER INSIDE AN INTERIOR ROOM.

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

&&

LAT...LON 3550 8018 3550 8029 3537 8037 3530 8065
      3554 8081 3579 8054 3578 8049 3573 8042
      3573 8034 3571 8032 3568 8033 3564 8030
      3563 8025 3558 8020
TIME...MOT...LOC 1731Z 238DEG 42KT 3552 8048

$$

JOH
814 
WWUS52 KGSP 181750
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
150 PM EDT TUE SEP 18 2012

NCC025-097-159-181800-
/O.CAN.KGSP.SV.W.0568.000000T0000Z-120918T1800Z/
CABARRUS NC-IREDELL NC-ROWAN NC-
150 PM EDT TUE SEP 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR ROWAN...SOUTHEASTERN IREDELL
AND CABARRUS COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THIS AREA. 
HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 3550 8018 3550 8029 3537 8037 3530 8065
      3554 8081 3579 8054 3578 8049 3573 8042
      3573 8034 3571 8032 3568 8033 3564 8030
      3563 8025 3558 8020
TIME...MOT...LOC 1750Z 238DEG 42KT 3564 8025

$$

JOH

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 18, 10:33 AM EDT, 2 hours 35 minutes earlier.

Area forecast discussion, Sep 18, 10:33 AM EDT, 2 hours 35 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1033 AM EDT TUE SEP 18 2012

.SYNOPSIS...
WAVES OF LOW PRESSURE WILL TRACK NORTHEAST ALONG A COLD FRONT AS THE
FRONT SLOWLY CROSSES OUR REGION FROM THE WEST TODAY.  THIS FRONT
WILL REACH THE CAROLINA COAST WEDNESDAY MORNING AS DRIER HIGH
PRESSURE BUILDS IN FROM THE OHIO RIVER VALLEY. EXPECT THE NEXT COLD
FRONT TO CROSS OUR AREA DURING THE WEEKEND.

&&

.NEAR TERM /THROUGH TONIGHT/...
AS OF 1025 AM...WIDESPREAD SHRA AND ISOLATED TSRA ARE MOVING ACROSS
THE CWFA ATTM. ALL INDICATIONS ARE THAT THE BEST INSTABILITY THIS
AFTERNOON WILL BE OVER THE I-77 CORRIDOR...AND POSSIBLY A FEW
COUNTIES WEST OF THERE. UP TO MODERATE INSTABILITY IS POSSIBLE AS
THE 12Z GSO RAOB SHOWED DECENT H85 TO H5 LAPSE RATE. SHEAR IS QUITE
STRONG WITH OBSERVED BULK SHEAR OF 46 KTS AND 0-3KM HELICITY OF 403.
THIS MEANS ANY STORM THAT FORMS OVER THE ERN CWFA HAS THE POTENTIAL
TO PRODUCE DAMAGING WINDS OR EVEN A TORNADO. CANNOT COMPLETELY RULE
OUT A SVR STORM OVER THE WRN CWFA...BUT CHC WILL DIMINISH THRU THE
AFTERNOON. THE BIGGER THREAT OVER THE WRN CWFA WILL BE FLOODING.
PRECIP AMOUNTS OVERNIGHT WERE QUITE HIGH AND WITH CONTINUED HEAVY
RAINFALL THRU AT LEAST EARLY AFTERNOON...THE ONGOING FLOODING COULD
EXPAND. THEREFORE...WILL EXTEND THE FLOOD WATCH TO GO THRU THE REST
OF THE DAY. OTHERWISE...EXPECT PRECIP TO END FROM SW TO NE LATE THIS
AFTERNOON INTO EARLY EVENING. HOWEVER...ISOLATED SHRA COULD CONTINUE
OVERNIGHT ACROSS THE MTNS IN THE MOIST NWLY FLOW. EXPECT GUSTY SWLY
WINDS TO CONTINUE AHEAD OF THE APPROACHING COLD FRONT TO SWING
AROUND THE COMPASS TO NLY OVERNIGHT WITH DIMINISHING GUSTS. CLOUDS
WILL ALSO DIMINISH FROM SW TO NE OVERNIGHT WITH LINGERING CLOUDS
OVER THE MTNS IN THE MOIST NWLY FLOW. MADE SOME MINOR ADJUSTMENTS TO
HIGHS BASED ON CURRENT AND EXPECTED CONDITIONS.

630 AM EDT UPDATE...FCST IS IN GOOD SHAPE OVERALL. MADE SOME TWEAKS
TO THE TEMPS/TDS. THE POPS...SKY AND WIND ARE ON TRACK. RADAR
CONTINUES TO SHOW WEAK RETURNS ACROSS THE MTNS AS THE LLVL FLOW HAS
BECOME PARALLEL. MORE WIDESPREAD SHOWERS WILL MOVE IN FROM THE SW
OVER THE NEXT HR OR SO AND WORK INTO THE SW NC MTNS...MAINTAINING
THE HYDRO THREAT WHERE 2-3 INCHES OF RAIN HAS FALLEN OVER THE PAST
18 HRS.

430 AM EDT UPDATE...MADE MINOR TWEAKS TO THE TEMPS/TDS AS ATMOS HAS
BECOME RATHER STEADY STATE ACROSS MOST AREAS. PRECIP HAS FILLED IN A
LITTLE ACROSS THE ERN AND SE/RN ZONES AS EXPECTED AND CONTINUED ERN
DEVELOPMENT WILL BE THE TREND OVER THE NEXT FEW HRS. ACROSS THE
MTNS...THE AREA OF PRECIP WILL CONTINUE THE LOW END RATES WHILE
PUSHING OFF TO THE NE. AN AREA FAIRLY WIDESPREAD PRECIP MAINTAINED
BY DOWNSTREAM ULVL DIV SHOULD BEGIN MOVING INTO THE SW/RN NC
MTNS...NE GA AND THE WRN UPSTATE AROUND 12Z. HYDRO CONCERNS REMAIN
ACROSS THE SRN NC BLUE RIDGE AS THIS AREA HAS RECEIVED 1-3 INCHES OF
RAINFALL IN THE PAST 18 HRS.

ONGOING PRECIP HAS FILLED IN ACROSS THE NC FHILLS AND PIEDMONT
DURING THE PAST COUPLE HOURS AND MOST LOCATIONS THERE SHOULD SEE
MEASURABLE RAINFALL BEFORE SUNRISE. LOW END COVERAGE IS NOTED ACROSS
THE UPSTATE...HOWEVER VERY LIGHT -SHRA CONTINUES TO DEVELOP ACROSS
NE GA AND TRACK NE. THE NC MTNS ARE STILL EXPERIENCING THE HIGHER
RAINFALL RATES...ABOUT 0.75 TO 1.0 INCHES PER HR WITH THE STRONGER
DOWNPOURS. A FLOOD ADVISORY HAS JUST BEEN ISSUED FOR AVERY COUNTY
AND THIS SHOULD BE THE LAST AREA OF CONCERN HYDRO/WISE OVER THE NEXT
FEW HOURS. WITH 24 HR STP SHOWING AREAS OF 1.5 TO 2.0 INCHES ACROSS
THE NC MTNS...MAINLY AROUND THE SRN BLUE RIDGE AND NRN FHILLS...AND
WITH MORE SUSTAINED RAIN PUSHING IN FROM TN LATER THIS MORNING...THE
FLOOD WATCH WILL BE LEFT AS IS TO EXPIRE AT 16Z.

A COMPLICATED SYNOPTIC PATTERN WILL ENCOMPASS THE FA THIS AFTERNOON
AND EVENING. THE SW/RN UPPER LOW WILL CONTINUE TO BECOME PULLED NE
BY A LARGER SCALE TROF SWINGING THROUGH THE OH VALLEY. THE AMOUNT OF
S/W FORCING IS SOMEWHAT SUSPECT AS H5/H7 DPVA IS MAXIMIZED WELL NORTH
OF THE AREA...HOWEVER THERE WILL BE A WINDOW OF TIME...PROB 16Z-22Z
WHERE THE MLVL FORCING IS ENHANCED BY A FINGER OF THE DEPARTING
UPPER JET CORE. THE LLVLS WILL FEATURE A SFC TROF AXIS PUSHING INTO
THE CWFA FAIRLY LATE...AROUND 06Z WED BY THE TIME IT REACHES THE ERN
ZONES. BEFOREHAND...THE REGION WILL BE IN A WARM SECTOR WITH A WEAK
TRIPLE POINT LOW SLOWLY CROSSING OVERHEAD THROUGHOUT THE DAY. DEEP
LAYERED SHEAR WILL BE HIGH ALONG WITH MODERATE 0-3 KM
HELICITY...HOWEVER THE AMOUNT OF INSTABILITY WILL BE LIMITED DUE TO
CLOUDINESS...ESP ACROSS THE NW/RN HALF OF THE CWFA. THE SPC HAS THE
NE/RN AND ERN ZONES IN A SLGT RISK OF SVR WX AND A 5 PERCENT TOR
RISK WHICH SEEMS REASONABLE BY MID AFTERNOON FOR THAT AREA WITH
RELATIVELY HIGHER AMOUNTS OF SBCAPE AND A PROBABLE UPPER FORCING
CONNECTION. OUTSIDE OF THAT...MOST AREAS OUTSIDE THE MTNS SHOULD SEE
ISOL GENERAL TSTMS WITH SMALL HAIL AND STRONG WINDS POSSIBLE.

WITH THE AFOREMENTIONED CLOUD COVERAGE PATTERN...MAX TEMPS WILL BE
BELOW NORMAL BY A FEW DEGREES NORTH OF I85...WHILE AREAS TO THE
SOUTH AND EAST SHOULD BE RIGHT AROUND NORMAL. EXPECT DECENT CLEARING
AND DEEP LAYERED DRY AIR TO BEGIN MOVING INTO THE MTNS TONIGHT WHICH
WILL ALLOW MINS A FEW DEGREES BELOW NORMAL THERE AND AROUND NORMAL
OVER THE NON/MTNS.

&&

.SHORT TERM /WEDNESDAY THROUGH THURSDAY/...
AS OF 230 AM TUESDAY...COOLER NE FLOW WILL DEVELOP ACRS THE AREA ON
WEDNESDAY AND WHATEVER THE DEGREE OF LINGERING STRATOCU WINDS UP
BEING IN THE MORNING WILL BE INCREASINGLY MIXED WITH SUN AS THE
DAY WEARS ON. MAX TEMPS ARE SLATED TO AVERAGE 8 DEG F BELOW THE
MID-SEPTEMBER NORMAL. WEAK ELONGATED SFC RIDGING WILL BUILD INTO
THE APPALACHIANS WED NITE. IT IS DEBATABLE MUCH CLOUDS WILL RESULT
FROM THE TRAPPED RH WITHIN THE 80-85H LAYER...BUT AT THIS POINT
WILL FCST A MOSTLY CLEAR NIGHT ALLOWING THU AM MIN TEMPS TO FALL
6-8 DEG F FROM THE WED AM READINGS. WEAK LLVL RIDGE AXIS LINGERS
ATOP THE CWFA THRU THURSDAY WITH THE MEAN LLVL FLOW BECOMING LIGHTER
AND MORE VARIABLE. WITH A FAIR AMOUNT OF SUNSHINE EXPECTED...MAX
TEMPS SHOULD GET A COUPLE OF DEGREES BOOST FROM WEDNESDAY/S READINGS.

&&

.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
AS OF 215 AM TUESDAY...MEDIUM RANGE MODELS IN GOOD AGREEMENT ON
AN AMPLIFIED NOAM PATTERN CONTINUING...WITH A POLAR VORTEX INVOF
HUDSON BAY KEEPING A LONGWAVE TROF AXIS ALIGNED ROUGHLY ALONG THE MS
VLY THRU THE WEEKEND...SHIFTING EAST SLIGHTLY EARLY NEXT WEEK. AT
THE SFC...A FAIRLY STRONG COLD FRONT WILL DROP SOUTH OUT OF CANADA
THURSDAY...AND PUSH ACRS THE APPALACHIANS SATURDAY OR SATURDAY
NIGHT. THE HPC PREFERENCE IS FOR A FASTER SURGE OF CONTINENTAL-POLAR
AIR...HAVING THE FRONT THRU THE CWFA BY 00Z SUNDAY. THE FRONT WILL
NOT HAVE MUCH MOISTURE TO WORK WITH...SO KEEPING CHC POPS CONFINED
TO THE MTNS AND SLGT CHC ELSEWHERE...MAXIMIZED AROUND MIDDAY AND
EARLY AFTERNOON SATURDAY. OTHERWISE...DRY CONDITIONS EXPECTED THRU
THE MEDIUM RANGE. DID ADD SMALL QPF VALUES TO THE FORECAST ON
SATURDAY AND SATURDAY EVENING. TEMPS WILL BE NEAR NORMAL AHEAD OF
THE FRONT FRIDAY AND SATURDAY...THEN DROPPING TO 5-8 DEGREES
BELOW NORMAL BY MONDAY...AS CANADIAN HIGH PRES BUILDS IN FROM THE
NW. LOW TEMPS EARLY NEXT WEEK WILL BE IN THE 40S MOUNTAINS AND LOWER
50S ACROSS THE PIEDMONT.

&&

.AVIATION /15Z TUESDAY THROUGH SATURDAY/...
AT KCLT AND ELSEWHERE...CONVECTION WILL MOVE ACROSS THE AIRFIELD
LATE THIS MORNING WITH ADDITIONAL CONVECTION FOR THE AFTERNOON. WILL
UPDATE FOR CONVECTION WITH THE 15Z AMD. OTHERWISE...GUSTY SSW WIND
AND MVFR TEMPO IFR CONDITIONS EXPECTED UNTIL AFTER FROPA LATE THIS
AFTERNOON OR EARLY EVENING. VFR CONDS SHOULD BE MAINTAINED OVERNIGHT
AS DRIER AIR WORKS IN FROM THE NW. THAT SAID...COULD BE SOME FOG
OVERNIGHT BEFORE THE DRIER AIR WORKS IN...AND MTN VALLEYS COULD
BECOME IFR.

OUTLOOK...HIGH PRESSURE WILL BUILD OVER THE REGION FOR THE END OF
THE WEEK PRODUCING VFR CONDITIONS.

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...FLOOD WATCH UNTIL 6 PM EDT THIS EVENING FOR GAZ010-017.
NC...FLOOD WATCH UNTIL 6 PM EDT THIS EVENING FOR NCZ033-048>053-058-
     059-062>065-501-503-505-507-509.
SC...FLOOD WATCH UNTIL 6 PM EDT THIS EVENING FOR SCZ001>003.

&&

SYNOPSIS...DEO
NEAR TERM...RWH/SBK
SHORT TERM...CSH
LONG TERM...ARK/DEO
AVIATION...RWH/SBK
Hazardous weather outlook, Sep 18, 3:08 AM EDT, 10 hours before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
308 AM EDT TUE SEP 18 2012

GAZ010-017-NCZ033-048>053-058-059-062>065-501-503-505-507-509-
SCZ001>003-190715-
RABUN-HABERSHAM-AVERY-MADISON-YANCEY-MITCHELL-SWAIN-HAYWOOD-BUNCOMBE-
GRAHAM-NORTHERN JACKSON-MACON-SOUTHERN JACKSON-TRANSYLVANIA-
HENDERSON-CALDWELL MOUNTAINS-BURKE MOUNTAINS-MCDOWELL MOUNTAINS-
RUTHERFORD MOUNTAINS-POLK MOUNTAINS-OCONEE MOUNTAINS-
PICKENS MOUNTAINS-GREENVILLE MOUNTAINS-
308 AM EDT TUE SEP 18 2012

...FLOOD WATCH IN EFFECT UNTIL NOON EDT TODAY...

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

   FLOOD WATCH.

THE THREAT FOR LOCALLY HEAVY SHOWERS AND EMBEDDED THUNDERSTORMS WILL
CONTINUE TODAY. THERE IS ALSO THE POSSIBILITY THAT THUNDERSTORMS WILL
BE STRONG ENOUGH TO PRODUCING LOCALIZED DAMAGING WIND GUSTS.

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

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

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

GAZ018-026-028-029-NCZ035>037-056-057-068>072-082-502-504-506-508-
510-SCZ004>014-019-190715-
STEPHENS-FRANKLIN-HART-ELBERT-ALEXANDER-IREDELL-DAVIE-CATAWBA-ROWAN-
CLEVELAND-LINCOLN-GASTON-MECKLENBURG-CABARRUS-UNION NC-
GREATER CALDWELL-GREATER BURKE-EASTERN MCDOWELL-GREATER RUTHERFORD-
EASTERN POLK-GREATER OCONEE-GREATER PICKENS-GREATER GREENVILLE-
SPARTANBURG-CHEROKEE-YORK-ANDERSON-ABBEVILLE-LAURENS-UNION SC-
CHESTER-GREENWOOD-
308 AM EDT TUE SEP 18 2012

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

.DAY ONE...TODAY AND TONIGHT.

THE THREAT OF LOCALLY HEAVY RAIN WILL CONTINUE TODAY AND THUNDERSTORMS
ARE ALSO EXPECTED TO REDEVELOP. LOCALLY STRONG TO SEVERE STORMS
MAY BE SEEN AS WELL...PRODUCING HAIL OR DAMAGING WIND GUSTS...AND
PERHAPS EVEN A BRIEF TORNADO.

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

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Special weather statement, Sep 18, 11:48 AM EDT, 1 hour 20 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1148 AM EDT TUE SEP 18 2012

NCZ035>037-056-057-181630-
ALEXANDER-CATAWBA-DAVIE-IREDELL-ROWAN-
1148 AM EDT TUE SEP 18 2012

...STRONG THUNDERSTORMS WILL AFFECT DAVIE...EASTERN ALEXANDER...
IREDELL...NORTHERN CATAWBA AND NORTHWESTERN ROWAN COUNTIES THROUGH
1230 PM EDT...

AT 1144 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 3 MILES NORTHWEST OF
LOVE VALLEY TO 3 MILES SOUTH OF HILDEBRAN...MOVING EAST AT 35 MPH.

THESE STORMS WILL IMPACT LOCATIONS NEAR...
  ST. STEPHENS...
  NEWTON...
  STONY POINT...
  LOOKOUT SHOALS LAKE...
  HARMONY...
  STATESVILLE...

WIND GUSTS OF 40 TO 50 MPH...AND TORRENTIAL RAIN ARE EXPECTED WITH
THESE STORMS.

HEAVY RAINS MAY FLOOD AREAS WITH POOR DRAINAGE...SUCH AS DITCHES AND
UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS. WATER
LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE RAPIDLY. SEEK HIGHER
GROUND IF THREATENED BY FLOOD WATERS.

LAT...LON 3571 8069 3560 8151 3575 8138 3605 8103
      3607 8098 3605 8049 3607 8046 3601 8041

JOH
Special weather statement, Sep 18, 11:53 AM EDT, 1 hour 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1153 AM EDT TUE SEP 18 2012

SCZ008-009-013-181630-
CHEROKEE-UNION-YORK-
1153 AM EDT TUE SEP 18 2012

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN UNION...NORTHWESTERN
YORK AND SOUTHEASTERN CHEROKEE COUNTIES THROUGH 1230 PM EDT...

AT 1153 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 3 MILES EAST OF JONESVILLE...OR 8 MILES NORTH OF
UNION...MOVING NORTHEAST AT 40 MPH.

THIS STORM WILL IMPACT LOCATIONS NEAR...
  HICKORY GROVE...
  CLOVER...

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

LAT...LON 3474 8159 3487 8175 3517 8142 3516 8125
      3508 8115

HG
Local storm report, Sep 18, 12:01 PM EDT, 1 hour 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1201 PM EDT TUE SEP 18 2012

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

1140 AM     FLASH FLOOD      JONAS RIDGE             35.97N 81.89W
09/18/2012                   BURKE              NC   BROADCAST MEDIA

            FLOODING OF HIGHWAY NC 183. ROADWAY COVERED FROM FLOODED
            CREEK.

&&

HG
Special weather statement, Sep 18, 12:40 PM EDT, 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1240 PM EDT TUE SEP 18 2012

NCZ071-082-SCZ009-181730-
MECKLENBURG-UNION-YORK-
1240 PM EDT TUE SEP 18 2012

...STRONG THUNDERSTORMS WILL AFFECT EASTERN YORK...MECKLENBURG AND
UNION COUNTIES THROUGH 130 PM EDT...

AT 1240 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES NORTHWEST OF
LAKE WYLIE TO FORT MILL TO CATAWBA...MOVING NORTHEAST AT 45 MPH.

THESE STORMS WILL IMPACT LOCATIONS NEAR...
  PAW CREEK...
  I-77 AT I-85...
  MINT HILL...
  UNC CHARLOTTE...
  UNIONVILLE...
  MARSHVILLE...

PEA SIZE HAIL...WIND GUSTS UP TO 40 MPH...AND TORRENTIAL RAIN ARE
EXPECTED WITH THESE STORMS.

LAT...LON 3483 8031 3481 8043 3481 8079 3494 8079
      3505 8089 3484 8086 3482 8089 3482 8097
      3515 8118 3515 8101 3530 8101 3540 8076
      3535 8069 3527 8066 3517 8046 3495 8030

HG
Special weather statement, Sep 18, 12:41 PM EDT, 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1241 PM EDT TUE SEP 18 2012

NCZ036-037-056-057-181745-
CATAWBA-DAVIE-IREDELL-ROWAN-
1241 PM EDT TUE SEP 18 2012

...STRONG THUNDERSTORMS WILL AFFECT DAVIE...EASTERN CATAWBA...IREDELL
AND NORTHERN ROWAN COUNTIES THROUGH 145 PM EDT...

AT 1239 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM COURTNEY TO
CATAWBA...MOVING EAST AT 35 MPH.

THESE STORMS WILL IMPACT LOCATIONS NEAR...
  STATESVILLE...
  FARMINGTON...
  TROUTMAN...
  BERMUDA RUN...
  ADVANCE...
  COOLEEMEE...

WIND GUSTS OF 40 TO 50 MPH...AND TORRENTIAL RAIN ARE EXPECTED WITH
THESE STORMS.

HEAVY RAINS MAY FLOOD AREAS WITH POOR DRAINAGE...SUCH AS DITCHES AND
UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS. WATER
LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE RAPIDLY. SEEK HIGHER
GROUND IF THREATENED BY FLOOD WATERS.

LAT...LON 3561 8130 3606 8069 3605 8049 3607 8046
      3601 8041 3599 8041 3596 8037 3589 8036
      3588 8041 3585 8038 3582 8046 3579 8047
      3574 8045 3571 8032 3568 8033 3563 8029

JOH
Special weather statement, Sep 18, 12:45 PM EDT, 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1245 PM EDT TUE SEP 18 2012

NCZ036-056-057-068>072-508-181745-
CABARRUS-CATAWBA-CLEVELAND-GASTON-GREATER
RUTHERFORD-IREDELL-LINCOLN-MECKLENBURG-ROWAN-
1245 PM EDT TUE SEP 18 2012

...STRONG THUNDERSTORMS WILL AFFECT CLEVELAND...GASTON...LINCOLN...
NORTHWESTERN CABARRUS...NORTHWESTERN MECKLENBURG...SOUTHEASTERN
IREDELL...SOUTHEASTERN RUTHERFORD...SOUTHERN CATAWBA AND SOUTHERN
ROWAN COUNTIES THROUGH 145 PM EDT...

AT 1244 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES NORTHEAST OF
VALE TO CLIFFSIDE...MOVING EAST AT 35 MPH.

THESE STORMS WILL IMPACT LOCATIONS NEAR...
  MAIDEN...
  SHELBY...
  LINCOLNTON...
  TERRELL...
  IRON STATION...
  LAKE NORMAN...

WIND GUSTS OF 40 TO 50 MPH...AND TORRENTIAL RAIN ARE EXPECTED WITH
THESE STORMS.

HEAVY RAINS MAY FLOOD AREAS WITH POOR DRAINAGE...SUCH AS DITCHES AND
UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS. WATER
LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE RAPIDLY. SEEK HIGHER
GROUND IF THREATENED BY FLOOD WATERS.

LAT...LON 3564 8036 3516 8103 3519 8194 3561 8135

JOH

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 18, 2:21 AM EDTAreal Flood AdvisoryGSPMitchell2 hr
Sep 18, 2:46 AM EDTAreal Flood AdvisoryGSPAvery4 hr
Sep 18, 9:20 AM EDTAreal Flood AdvisoryGSPAvery, Mitchell5 hr
Sep 18, 10:06 AM EDTFlash Flood WarningGSPAvery, Mitchell4 hr
Sep 18, 10:32 AM EDTSpecial Weather StatementGSPAlexander, Burke, Caldwell, Rutherford43 min
Sep 18, 10:48 AM EDTAreal Flood AdvisoryGSPBuncombe, Burke, Henderson, McDowell, Rutherford4 hr
Sep 18, 11:29 AM EDTSpecial Weather StatementGSPCabarrus46 min
Sep 18, 11:48 AM EDTSpecial Weather StatementGSPAlexander, Catawba, Davie, Iredell42 min
Sep 18, 12:40 PM EDTSpecial Weather StatementGSPMecklenburg, Union50 min
Sep 18, 12:41 PM EDTSpecial Weather StatementGSPCatawba, Davie, Iredell, Rowan64 min
Sep 18, 12:45 PM EDTSpecial Weather StatementGSPCleveland, Gaston, Lincoln60 min
Sep 18, 12:59 PM EDTAreal Flood WarningGSPHenderson, Transylvania94 min
Sep 18, 4:39 PM EDTSpecial Weather StatementGSPCleveland36 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2012Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.