Severe Thunderstorm Warning 366, NWS Greenville-Spartanburg, SC

000 
WWUS52 KGSP 240902
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
502 AM EDT MON AUG 24 2009

NCC159-240945-
/O.CON.KGSP.SV.W.0366.000000T0000Z-090824T0945Z/
ROWAN NC-
502 AM EDT MON AUG 24 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 AM EDT
FOR NORTHWESTERN ROWAN COUNTY...

AT 501 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED 2 MILES SOUTH OF CLEVELAND...OR 10 MILES WEST OF 
SALISBURY...AND IT WAS MOVING NORTHEAST AT 15 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WOODLEAF AND SPENCER

LAT...LON 3560 8070 3568 8071 3571 8074 3584 8064
      3571 8038
TIME...MOT...LOC 0902Z 236DEG 13KT 3569 8066

$$
MCAVOY

000 
WWUS52 KGSP 240924
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
524 AM EDT MON AUG 24 2009

NCC159-240934-
/O.CAN.KGSP.SV.W.0366.000000T0000Z-090824T0945Z/
ROWAN NC-
524 AM EDT MON AUG 24 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ROWAN COUNTY IS
CANCELLED...

THE STORM THAT PROMPTED THE WARNING HAS WEAKENED TO BELOW SEVERE 
LIMITS. HOWEVER...HEAVY RAIN AND OCCASIONAL CLOUD TO GROUND 
LIGHTNING WILL STILL AFFECT NORTHERN ROWAN COUNTY THROUGH 6 AM.

LAT...LON 3560 8070 3568 8071 3571 8074 3584 8064
      3571 8038
TIME...MOT...LOC 0924Z 236DEG 13KT 3573 8058

$$
MCAVOY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
223 AM EDT MON AUG 24 2009

.SYNOPSIS...
A STATIONARY FRONT WILL WEAKEN NEAR THE COAST. A WEAK RIDGE OF HIGH
PRESSURE WILL PERSIST ACROSS OUR AREA THROUGH SATURDAY. AN UPPER LOW
WILL FORM OVER THE GULF STATES ON TUESDAY...AND WILL WEAKEN AND MOVE
EAST LATE IN THE WEEK. A COLD FRONT WILL CROSS OUR AREA FROM THE
NORTHWEST ON SUNDAY.

&&

.NEAR TERM /THROUGH TONIGHT/...
AN AREA OF SHOWERS AND THUNDERSTORMS DEVELOPED SEVERAL HOURS AGO
OVER THE SC UPSTATE AND THE SRN PIEDMONT AND FOOTHILLS OF NC. THE
CONVECTION IS BEING AIDED BY AN INCREASING ENE UPSLOPE FLOW AND GOOD
PVA AS AN ADVECTIVE SHORT WAVE IS SLOWLY CROSSING THE REGION. THE
AREA OF SHOWERS AND STORMS SHOULD CONTINUE TO DRIFT TO THE NE
THROUGH SUNRISE...THOUGH PCPN SHOULD TAPER OFF FROM SW TO NE AS THE
SHORT WAVE SLOWLY MOVES NE OF THE AREA.

LATER TODAY THE H5 TROUGH AXIS WILL STILL BE ORIENTED ACROSS THE WRN
CAROLINAS AND NE GA. IT WILL TAKE ON A MORE W TO E ORIENTATION AS A
DEEP LAYER RIDGE MOVES INTO THE MID-ATLANTIC STATES. THIS WILL CAUSE
MOST OF THE ENERGY IN THE TROUGH TO BEGIN RETROGRESSING TO THE SW
UNDER THE RIDGE. STILL...THE WEAK UPSLOPE FLOW AND MOISTURE POOLING
ALONG THE SFC TROUGH WILL RESULT IN ENOUGH INSTABILITY LATER IN THE
DAY FOR SCT TO ISOLATED TSTMS TO DEVELOP OVER THE MTNS...AND BACK
ACROSS THE PIEDMONT ZONES WHERE THE BEST INSTABILITY AND LIMITED
SYNOPTIC SCALE FORCING WILL BE PRESENT.

CONVECTION WILL HOPEFULLY END SOONER THIS EVENING THAN IT DID
YDAY...BUT THE MODEL SOUNDINGS SHOW ENE UPSLOPE FLOW STRENGTHENING
ONCE AGAIN TONIGHT...AND I WOULDN/T BE SURPRISED TO SEE A FEW AREAS
OF CONVECTION LINGER WELL INTO THE EVENING HOURS. DETERMINING WHERE
THOSE AREAS OF CONVECTION WILL BE IS ALMOST IMPOSSIBLE...BUT I/LL
KEEP SLIGHT CHANCE POPS GOING OVER THE MTNS AND FOOTHILLS TO ACCOUNT
FOR THE POSSIBILITY.

&&

.SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/...
AS OF 220 AM EDT MON...THE MODELS SHOW AN UPPER LOW NEAR THE MS/AL
BORDER TUESDAY MORNING...WITH AN UPPER TROUGH EXTENDING FROM
CHESAPEAKE BAY TO THE SOUTHERN APPALACHIANS. BY WEDNESDAY MORNING
THE LOW HAS RETROGRADED TO LA...WHILE THE REMNANTS OF THE UPPER
TROUGH REMAIN OVER OUR AREA. AN AXIS OF DIMINISHING MOISTURE WILL
REMAIN ALONG THE UPPER TROUGH. ADDITIONAL MOISTURE WILL MOVE INLAND
FROM THE COAST AS THE THE WESTERN ATLANTIC RIDGE BUILDS WEST IN THE
WAKE OF THE RETROGRADING LOW...BUT THIS MOISTURE APPEARS TO STALL
JUST EAST OF OUR AREA.

SMALL DIURNAL POPS FOR CONVECTION WILL BE CARRIED ALONG THE TROUGH
AXIS...MAINLY IN THE MOUNTAINS AND INTERSTATE 40 CORRIDOR.
TEMPERATURES WILL BE ABOVE NORMAL...AND TREND UPWARD...AS HEIGHTS
RISE WITH WEAKENING OF THE TROUGH AND RETROGRESSION OF THE LOW.

&&

.LONG TERM /THURSDAY THROUGH SUNDAY/...
AS OF 220 AM EDT MON...THE GFS AND ECMWF HAVE AN UPPER LOW ALONG THE
CENTRAL GULF COAST ON THU...WITH A RIDGE DOWNSTREAM OVER OUR AREA.
THIS RIDGE WEAKENS ON FRIDAY...THEN THE REMAINS OF THE LOW PROGRESS
TO THE EAST COAST ON FRIDAY.BY SUNDAY OUR AREA IS BETWEEN A FLAT
RIDGE CENTERED IN FL...AND A LOW AMPLITUDE TROUGH IN THE GREAT
LAKES. THE MODEL DISAGREE ON THE LONGITUDE OF THIS TROUGH...WITH THE
GFS OVER THE EASTERN LAKES...AND THE ECMWF OVER THE WESTERN LAKES.
HPC EXPRESSED AN PREFERENCE FOR A BLEND OF THE MODELS EARLY
ON...TRENDING TO A BLEND OF THE ECMWF AND GFS ENSEMBLE MEAN.

ON THURSDAY A STATIONARY FRONT WILL BE LOCATED OVER THE OH AND
POTOMAC VALLEYS. OUR AREA REMAINS IN THE WARM SECTOR SOUTH OF THIS
FRONT INTO SATURDAY...WHILE A SURFACE WAVE MOVES FROM THE PLAINS TO
NY...AND A TRAILING COLD FRONT CROSSES THE TN VALLEY. THIS FRONT
CROSSES OUR AREA ON SUNDAY. TEMPERATURES WILL TREND FROM SLIGHTLY
ABOVE CLIMATOLOGY TO SLIGHTLY BELOW AS THE SOUTHEASTERN RIDGE BREAKS
DOWN. POPS WILL INCREASE FROM SLIGHT CHANCE ON THURSDAY...TO LOW
CHANCE FOR THE REST OF THE FORECAST...AS MOISTURE ASSOCIATED WITH
THE REMAINS OF THE UPPER LOW MOVE EAST...AN THE AIR MASS REMAINS
MOIST AHEAD OT THE APPROACHING COLD FRONT.

&&

.AVIATION /07Z MONDAY THROUGH FRIDAY/...
KCLT AND ELSEWHERE...AN UPPER LOW HAS TRIGGERED SHOWERS AND
THUNDERSTORMS OVER THE REGION...MOST OF WHICH WERE LOCATED BETWEEN
KCLT AND KAVL AT ISSUANCE TIME. KHKY IS PROBABLY THE SITE THAT HAS
THE BEST CHANCE OF SEEING SHOWERS AT THE AIRFIELD THE REST OF THE
NIGHT. WEAK UPSLOPE FLOW WILL ALSO RESULT IN LOWER CIGS AND VSBYS
THERE...AND KAVL WILL PROBABLY SEE SOME FOG AND STRATUS DEVELOP LATE
TONIGHT AS WELL WITH HIGHER DEWPOINTS OVER THE FRENCH BROAD VALLEY.

WINDS WILL BE OUT OF THE NORTHEAST THROUGH THE PERIOD ACROSS THE
REGION. THE ONLY EXCEPTION WILL BE KAND WHICH MAY TURN TO THE SE FOR
A LITTLE WHILE THIS AFTN...AND KAVL WHICH WILL HAVE IT/S USUAL NNW
FLOW. SCT TO ISLD TSTMS WILL DEVELOP OVER THE REGION THIS
AFTN...ESPECIALLY THE MTNS...AND I HAVE INCLUDED CB/S AT KAVL AND
KHKY AS THEY WILL STAND THE BEST CHANCE OF HAVING SOME TSTMS IN THE
VCNTY LATER TODAY.

OUTLOOK...GUIDANCE CONTINUES TO SUGGEST EARLY MRNG FOG TUE...ESP
KAVL. LOW LEVEL MOISTURE INCREASES LATER IN THE WEEK WITH MRNG
CIG/VSBY RESTRICTIONS PSBL ACROSS THE AREA.

&&

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

&&

SYNOPSIS...JAT
NEAR TERM...MCAVOY
SHORT TERM...JAT
LONG TERM...JAT
AVIATION...MCAVOY

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
323 PM EDT SUN AUG 23 2009

GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065-
068>072-082-501>510-SCZ001>014-019-241930-
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-
323 PM EDT SUN AUG 23 2009

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

ISOLATED TO SCATTERED THUNDERSTORMS WILL DEVELOP THROUGH THE LATE
AFTERNOON AND EVENING HOURS ACROSS THE WESTERN CAROLINAS AND
NORTHEAST GEORGIA. COVERAGE OF THE THUNDERSTORMS WILL BE HIGHEST
NEAR THE BLUE RIDGE IN WESTERN NORTH CAROLINA THROUGH EARLY
EVENING. THE MAIN THREAT FROM ANY THUNDERSTORMS WILL BE CLOUD TO
GROUND LIGHTNING AND BRIEF HEAVY RAIN.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

NONE.

HG

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1114 PM EDT SUN AUG 23 2009

NCZ036-240400-
IREDELL-
1114 PM EDT SUN AUG 23 2009

...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN IREDELL COUNTY THROUGH
MIDNIGHT EDT...

AT 1112 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 4 MILES NORTH OF MOORESVILLE...OR 11 MILES SOUTH
OF STATESVILLE...MOVING NORTH AT 5 MPH.

* OTHER LOCATIONS AFFECTED INCLUDE BUT ARE NOT LIMITED TO TROUTMAN
  AND MOORESVILLE.

THIS NEARLY STATIONARY THUNDERSTORM HAS ALREADY DROPPED AROUND 2
INCHES OF RAIN ALONG AND EAST OF INTERSTATE 77 IN THE SOUTHERN PART
OF IREDELL COUNTY. AN ADDITIONAL INCH OF RAIN IS POSSIBLE IN THIS
AREA. WHILE THIS PART OF THE COUNTY IS NORMALLY NOT PRONE TO
FLOODING...CREEKS WILL RISE TO NEAR BANKFULL AND DEEP PONDING OF
WATER IS LIKELY IN LOW SPOTS AND POOR DRAINAGE AREAS.

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

MCAVOY

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1151 PM EDT SUN AUG 23 2009

NCZ070-240430-
GASTON-
1151 PM EDT SUN AUG 23 2009

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN GASTON COUNTY
THROUGH 1230 AM EDT...

AT 1151 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 5 MILES NORTHWEST OF CLOVER...OR 8 MILES
SOUTHWEST OF GASTONIA...MOVING NORTH AT 10 MPH.

* OTHER LOCATIONS AFFECTED INCLUDE BUT ARE NOT LIMITED TO CROWDERS
  AND BESSEMER CITY.

SMALL HAIL...AND WIND GUSTS OF 30 TO 40 MPH ARE EXPECTED WITH THIS
STORM.

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

MCAVOY

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
215 AM EDT MON AUG 24 2009

NCZ056-069-240700-
CATAWBA-LINCOLN-
215 AM EDT MON AUG 24 2009

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL LINCOLN AND SOUTHERN
CATAWBA COUNTIES THROUGH 300 AM EDT...

AT 212 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM ABOUT TWO MILES NORTH OF LINCOLNTON...MOVING
NORTH AT 10 MPH.

* OTHER LOCATIONS AFFECTED INCLUDE BUT ARE NOT LIMITED TO MAIDEN AND
  BOGER CITY.

SMALL HAIL...AND WIND GUSTS OF 30 TO 40 MPH ARE EXPECTED WITH THIS
STORM. RAINFALL RATES IN EXCESS OF AN INCH AN HOUR ARE ALSO LIKELY
ALONG ROUTE 321 NORTH OF LINCOLNTON. THIS WILL GREATLY REDUCE
VISIBILITIES AND LEAD TO DEEP PONDING OF WATER ON THE ROAD.

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

MCAVOY

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
325 AM EDT MON AUG 24 2009

NCZ036-069-071-240830-
IREDELL-LINCOLN-MECKLENBURG-
325 AM EDT MON AUG 24 2009

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN LINCOLN...NORTHERN
MECKLENBURG AND SOUTHERN IREDELL COUNTIES THROUGH 430 AM EDT...

AT 323 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 3 MILES WEST OF CORNELIUS...OR 6 MILES NORTHWEST
OF HUNTERSVILLE...MOVING NORTH AT A0 MPH.

* OTHER LOCATIONS AFFECTED INCLUDE BUT ARE NOT LIMITED TO LAKE
  NORMAN...MOORESVILLE...DAVIDSON AND CORNELIUS.

MOTHBALL SIZE HAIL...AND WIND GUSTS OF 30 TO 40 MPH ARE EXPECTED WITH
THIS STORM. RAINFALL RATES OF 1 TO 2 INCHES AN HOUR WILL ALSO OCCUR.
THIS WILL RESULT IN DEEP PONDING OF WATER IN LOW SPOTS AND POOR
DRAINAGE AREAS.

INTENSE 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.

MCAVOY

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
355 AM EDT MON AUG 24 2009

NCZ036-056-240845-
CATAWBA-IREDELL-
355 AM EDT MON AUG 24 2009

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN CATAWBA AND WESTERN
IREDELL COUNTIES THROUGH 445 AM EDT...

AT 355 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 3 MILES NORTHWEST OF TERRELL...OR 13 MILES EAST
OF NEWTON...MOVING NORTH AT 10 MPH.

* OTHER LOCATIONS AFFECTED INCLUDE BUT ARE NOT LIMITED TO TROUTMAN...
  TERRELL AND CATAWBA.

TORRENTIAL RAIN AND SMALL HAIL IS EXPECTED WITH THIS STORM.

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

MCAVOY