Severe Thunderstorm Warning 514, NWS Greenville-Spartanburg, SC

134 
WWUS52 KGSP 081705
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
105 PM EDT WED AUG 8 2012

NCC003-035-097-081730-
/O.CON.KGSP.SV.W.0514.000000T0000Z-120808T1730Z/
ALEXANDER NC-CATAWBA NC-IREDELL NC-
105 PM EDT WED AUG 8 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
IREDELL...EASTERN CATAWBA AND SOUTHEASTERN ALEXANDER COUNTIES UNTIL
130 PM EDT...

AT 103 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 5 MILES
SOUTHEAST OF STONY POINT...OR 7 MILES WEST OF STATESVILLE...MOVING
SOUTHEAST AT 10 MPH.

THE SEVERE THUNDERSTORM WILL IMPACT LOCATIONS NEAR...
  TROUTMAN AND STATESVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BRIEF DAMAGING WINDS WILL BLOW DOWN TREES AND POWER LINES OVER SMALL
AREAS. A BRIEF PERIOD OF LARGE HAIL IS ALSO POSSIBLE. SEEK SHELTER
INSIDE AN INTERIOR ROOM.

THIS SEVERE THUNDERSTORM IS ALSO PRODUCING EXTREMELY HEAVY RAINFALL.
FLOODING OF DRAINAGE DITCHES AND LOW LYING AREAS MAY OCCUR. DO NOT
DRIVE THROUGH AREAS WHERE WATER IS FLOWING OVER THE ROAD.

&&

LAT...LON 3583 8113 3590 8095 3571 8076 3556 8104
TIME...MOT...LOC 1705Z 337DEG 7KT 3579 8101

$$

MOORE

249 
WWUS52 KGSP 081729
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
129 PM EDT WED AUG 8 2012

NCC003-035-097-081738-
/O.EXP.KGSP.SV.W.0514.000000T0000Z-120808T1730Z/
ALEXANDER NC-CATAWBA NC-IREDELL NC-
129 PM EDT WED AUG 8 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN IREDELL...EASTERN
CATAWBA AND SOUTHEASTERN ALEXANDER COUNTIES WILL EXPIRE AT 130 PM
EDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LEVELS.  HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

ADDITIONAL STRONG TO SEVERE THUNDERSTORMS MAY AFFECT PORTIONS OF 
ALEXANDER...IREDELL...AND CATAWBA COUNTIES THROUGH LATE AFTERNOON.

LAT...LON 3583 8113 3590 8095 3571 8076 3556 8104
TIME...MOT...LOC 1728Z 337DEG 7KT 3575 8099

$$

MOORE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1036 AM EDT WED AUG 8 2012

.SYNOPSIS...
A WEAK STATIONARY FRONT WILL DISSIPATE OVER THE REGION TODAY...BEING
REPLACED BY WEAK HIGH PRESSURE FOR THURSDAY.  A COLD FRONT WILL PUSH
ACROSS THE AREA FROM THE WEST LATE FRIDAY. DRY HIGH PRESSURE WILL
THEN BUILD BEHIND THE FRONT OVER THE WEEKEND.

&&

.NEAR TERM /THROUGH TONIGHT/...
AS OF 1030 AM...LOW CLOUDS OVER THE SRN PIEDMONT AND CLT METRO AREA
HAVE BEEN SLOW TO BURN OFF GIVEN THE SATURATED SOIL CONDITIONS
THERE. THESE CLOUDS SHOULD LIFT AND SCATTER BY NOON...WITH PLENTY OF
INSOLATION TO REACH FORECAST AFTN MAX TEMPS. HAVE ACTUALLY BUMPED
MAXES UP A DEGREE IN PLACES WITH NO LOW CLOUDS THIS MORNING.

A WEAK SHORTWAVE WILL CROSS MAINLY THE NRN TIER OF THE FORECAST AREA
LATE TODAY...BUT WEAK LOW LEVEL CONVERGENCE AND DIFFERENTIAL HEATING
WILL PROVIDE THE MAIN TRIGGER FOR SCT AFTN/EVENING CONVECTION.
INSTABILITY WILL BE PLENTIFUL WITH SFC DEWPOINTS IN THE UPPER 60S TO
LOWER 70S AND STEEPER LAPSE RATES ARRIVING ALOFT. MID LEVEL DRY AIR
WILL ALSO CREATE STEEP SFC TO MID LEVEL EQUIVALENT POTENTIAL TEMP
LAPSES TO ENHANCE A DOWNBURST THREAT AND MARGINAL LARGE HAIL THREAT.
COVERAGE MAY BE FAIRLY LIMITED GIVEN THE DRIER AIR ARRIVING
ALOFT...BUT ANY TSTMS MAY BE STRONG WITH A FEW SEVERE.

IN A CHANGE FROM THE PAST FEW NIGHTS...WITH RELATIVELY DRIER AIR IN
PLACE THROUGH A DEEP LAYER...TSTM ACTIVITY SHOULD DIMINISH WITH THE
LOSS OF HEATING THIS EVENING. LESS CLOUDS ARE EXPECTED EARLY IN THE
NIGHT...WHICH SHOULD LEAD TO MORE FOG AND LOW CLOUD DEVELOPMENT LATE.

&&

.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
AS OF 300 AM WEDNESDAY...AN UNSEASONABLY STRONG SHORTWAVE TROF WILL
DIG ACRS THE GREAT LAKES AND OHIO VALLEY ON THURSDAY...WITH HEIGHTS
BEGINNING TO FALL ACRS THE CWFA. FCST SNDGS SHOW LESS INSTBY THAN
WEDNESDAY HOWEVER...WITH WEAK SHEAR. STILL EXPECT DECENT
DESTABILIZATION AND SCATTERED MTN CONVECTION WITH LESS COVERAGE ACRS
THE PIEDMONT. A FEW WET MICROBURSTS CAN BE EXPECTED THU AFTN/EARLY
EVE. HIGH TEMPS NEAR NORMAL.

THURSDAY NIGHT THRU FRIDAY NIGHT...THE SHORTWAVE TROF WILL CONTINUE
TO DIG AND CLOSE OFF INTO AN UPR LOW OVR THE GREAT LAKES. THE ECMWF
SOLN WAS THE MODEL OF CHOICE BY HPC WITH THIS FEATURE...AND HAS A
MODERATELY-FORCED COLD FRONT ENTERING THE MTNS FRI AFTN AND CROSSING
THE PIEDMONT FRI EVE. FCST SNDGS DO NOT LOOK IMPRESSIVE FOR
SEVERE...WITH ONLY 1500-2000 J/KG OF CAPE AND 20-30 KTS OF 0-6KM
BULK SHEAR. THE MAIN CONCERN IS THAT PRE-FRONTAL CLOUDS/PRECIP MAY
LIMIT DESTABILIZATION WITH THE FRONT. HOWEVER...BEING A MORE
SOUTHERN SOLN WITH THE UPR LOW...THE ECMWF BRINGS STRONG DEEP Q
CONVERGENCE WITH THE FRONT AND DECENT UPR JET DIVERGENCE. SO WILL
KEEP MENTION OF SEVERE POTENTIAL IN THE HWO FOR FRI-FRI NGT WITH THE
FRONT. TEMPS NEAR NORMAL FOR LOWS AND A CATEGORY OR TWO BELOW NORMAL.

&&

.LONG TERM /SATURDAY THROUGH TUESDAY/...
AS OF 330 AM WEDNESDAY...THE FCST WAS LEFT UNCHANGED FROM SATURDAY
ONWARD...AS THE LATEST GUIDANCE DID NOT SIGNIFICANTLY CHANGE FROM
PREVIOUS RUNS. SATURDAY AND SUNDAY STILL LOOK RELATIVELY PLEASANT
FOR EARLY AUGUST...WITH TEMPS A CATEGORY OR SO BELOW NORMAL...AND
BELOW NORMAL HUMIDITY AND POPS.

PREVIOUS DISCUSSION...
AS OF 145 PM TUESDAY...TROUGH AXIS AND COLD FRONT WILL PUSH ACROSS
THE AREA FRIDAY NIGHT INTO EARLY SATURDAY...WITH SOLID CHANCE/LIKELY
POPS LINGERING INTO FRIDAY EVENING. THE GLOBAL MODELS ARE IN DECENT
AGREEMENT IN STALLING THE FRONT SOUTH OF THE CWFA OVER THE
WEEKEND...WITH MUCH DRIER AIR ADVECTING INTO THE AREA. AFTER A
STORMY FRIDAY/FRI NIGHT...THE WEEKEND MAY TURN OUT TO BE QUITE
PLEASANT...WITH TEMPS AVERAGING A LITTLE BELOW NORMAL...AND POPS/
POSSIBLY RH AVERAGING MUCH BELOW NORMAL.

THE MODELS SUGGEST AIR MASS MODIFICATION WILL OCCUR QUICKLY IN THE
WAKE OF THE DEPARTING TROUGH...AS BERMUDA HIGH ALLOWS LOW LEVEL
MOISTURE/INSTABILITY TO RETURN. A MORE TYPICAL SUMMERTIME PATTERN
SHOULD YIELD MORE TYPICAL SUMMERTIME CONDITIONS...WITH ISOLATED TO
WIDELY SCATTERED DIURNAL CONVECTION EXPECTED ON DAYS 6/7. TEMPS WILL
ALSO LIKELY TO CLIMB TO NEAR NORMAL LEVELS BY THIS TIME.

&&

.AVIATION /15Z WEDNESDAY THROUGH SUNDAY/...
AT KCLT...VISIBLE SATELLITE IMAGERY SHOWS PLENTY OF SCATTERING OF
THE LOW CLOUDS OCCURRING AROUND KCLT LATE THIS MORNING...BUT WITH A
STUBBORN PATCH RIGHT OVER THE AIRFIELD. CIGS SHOULD LIFT TO MVFR
BEFORE 15Z...THEN SCATTER INTO EARLY AFTERNOON. THE BEST COMBINATION
OF LOW LEVEL CONVERGENCE AND INSTABILITY WILL BE FOCUSED TOWARD 21Z
THIS AFTERNOON...SO WILL ADVERTISE TEMPO TSRA FOR INITIAL TRIGGERING
AND SUBSEQUENT OUTFLOWS. SIGNALS REMAIN MIXED ON ANY RESTRICTIONS
LATE TONIGHT...SO WILL CONTINUE TO OMIT FOR NOW.

ELSEWHERE...IFR CIGS ARE VERY SLOWLY LIFTING AND SCATTERING FROM
KGMU TO KAND...WITH KGSP TO KAVL TO KHKY ALREADY VFR. ALL LOCATIONS
SHOULD HAVE ONLY SCT VFR CUMULUS BY 16Z...WITH CUMULUS THEN BUILDING
THIS AFTERNOON WITH HEATING. MTN TSRA SHOULD TRIGGER FIRST...WITH
STEERING FLOW AND OUTFLOWS CARRYING SCATTERED CONVECTION INTO THE
FOOTHILLS...ESPECIALLY IN NC. VCTS STARTING 18Z AT KAVL...AND 19Z AT
THE FOOTHILL SITES...LOOKS WELL TIMED. LIMITED HIGHER CLOUDS
OVERNIGHT MAY LEAD TO MORE WIDESPREAD FOG AND LOW CLOUDS THURSDAY
MORNING.

OUTLOOK...A NORMAL SUMMERTIME DIURNAL TSTM PATTERN IS EXPECTED ON
THURSDAY BEFORE A COLD FRONT WILL APPROACHES FROM THE NW ON FRIDAY
TO INCREASE THUNDERSTORM COVERAGE THROUGH FRI NIGHT. DRIER HIGH PRES
WILL RETURN OVER THE WEEKEND.

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...ARK
NEAR TERM...HG
SHORT TERM...ARK
LONG TERM...ARK/JDL
AVIATION...HG

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
443 AM EDT WED AUG 8 2012

GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065-
068>072-082-501>510-SCZ001>014-019-090845-
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-
443 AM EDT WED AUG 8 2012

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

.DAY ONE...TODAY AND TONIGHT.

SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS THE REGION
THIS AFTERNOON INTO THIS EVENING. A FEW STORMS MAY BE STRONG
ENOUGH TO PRODUCE LOCALLY DAMAGING WIND GUSTS AND LARGE HAIL.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

A STRONG COLD FRONT WILL APPROACH THE REGION LATE FRIDAY. THERE
IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ASSOCIATED WITH THE
FRONT. DAMAGING WIND GUSTS WILL BE THE PRIMARY THREAT.

.SPOTTER INFORMATION STATEMENT...

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

ARK

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1232 PM EDT WED AUG 8 2012

NCZ035-036-081715-
ALEXANDER-IREDELL-
1232 PM EDT WED AUG 8 2012

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL IREDELL AND SOUTHEASTERN
ALEXANDER COUNTIES THROUGH 115 PM EDT...

AT 1228 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR SCOTTS...OR 9 MILES NORTHWEST OF
STATESVILLE...MOVING SOUTHEAST AT 10 MPH.

THIS STORM WILL IMPACT LOCATIONS NEAR...
  STATESVILLE...

SMALL HAIL...WIND GUSTS OF 40 TO 50 MPH AND TORRENTIAL RAIN ARE
EXPECTED WITH THIS STORM.

LAT...LON 3587 8070 3578 8073 3561 8085 3579 8113
      3580 8113 3581 8114 3583 8115 3582 8119
      3585 8122 3599 8103

JOH