Alert archive / Georgia / Special Weather Statements in 2011

Special Weather Statement, NWS Greenville-Spartanburg, SC

August 9, 2011Franklin County, Georgia

NWS Greenville-Spartanburg, SC issued this special weather statement at Aug 9, 2011, 4:32 PM EDT for Franklin County, Georgia. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 9, 2011, 4:32 PM EDT (20:32 UTC)
Expired: Aug 9, 2011, 5:00 PM EDT
In force: 28 min
Issued by: NWS Greenville-Spartanburg, SC

County Franklin County, GA

The radar

The Greer radar (KGSP), 113 km from the middle of the area, began a volume at 20:34 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.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.5 hours before the alert went out and 156 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: 768 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 800 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 9, 2:35 PM EDT, 1 hour 57 minutes earlier.

Area forecast discussion, Aug 9, 2:35 PM EDT, 1 hour 57 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
235 PM EDT TUE AUG 9 2011

.SYNOPSIS...
A WEAK FRONTAL BOUNDARY ALONG WITH A HOT AND HUMID AIRMASS WILL
LINGER OVER THE REGION THROUGH TONIGHT. A RIDGE OF HIGH PRESSURE
WITH DRIER AIR WILL BUILD BACK OVER THE AREA ON WEDNESDAY.
ANOTHER FRONT WILL ENTER THE AREA ON SATURDAY...BRINGING A CHANCE
FOR RAIN AND THUNDERSTORMS ALONG WITH COOLER TEMPERATURES.

&&

.NEAR TERM /THROUGH WEDNESDAY/...
BIG QUESTION FOR THE IMMEDIATE TERM IS THE EXTENT OF DEEP CONVECTION
FOR THE AFTERNOON AND EVENING. VISIBLE SATELLITE IMAGERY AT 1830 UTC
SHOWS REMNANTS OF CONVECTIVE DEBRIS CLOUDINESS MOVING ACROSS THE WRN
CAROLINAS. SO FAR...THIS APPEARS TO HAVE DELAYED INITIATION OF DEEP
CONVECTION...BUT IN THE WAKE OF THIS FEATURE THERE IS SOME CU
DEVELOPMENT IN WRN NC. THE MORE INTERESTING FEATURE IS THE APPARENT
MVC OVER MIDDLE TN/NRN AL. THIS MAY GIVE A LITTLE KICK TO THE
CONVECTION AS IT MAKES ITS WAY EASTWARD LATER TODAY. THE UPDATED DAY
1 OUTLOOK HAS THE SRN MTNS...NE GEORGIA AND THE UPSTATE IN THE
SLIGHT RISK. IN THE MEAN TIME...CONFIDENCE CONTINUES TO DROP ABOUT
THE EXTENT OF THE CONVECTION. THE 09Z SREF KEPT THE ENTIRE FCST AREA
DRY THIS AFTERNOON. IN DEFERENCE TO THE SLIGHT RISK...WILL KEEP SOME
LOW END CHANCE POP OVER THE SRN THIRD OF THE FCST AREA.

THE CONVECTIVE POTENTIAL SHOULD MOVE EAST AND END WITH THE MVC
PASSAGE...AFTER WHICH SKY SHOULD CLEAR. THE MODELS ALSO BRING THE
SURFACE FRONT ACROSS THE REGION THIS EVENING WITH WINDS BECOMING N.
HAVE KEPT THE FCST CLOSE TO A GUIDANCE BLEND OVERNIGHT.

ON WEDNESDAY...WE REMAIN AT THE BOTTOM OF THE UPPER LONG WAVE TROF
CENTERED OVER THE EASTERN PART OF THE COUNTRY. DEEP LAYER DRYING AND
WARMER AIR ALOFT WILL SERIOUSLY CURTAIL OUR CONVECTIVE PRECIP
CHANCES SO HAVE FOLLOWED THE SREF AND KEPT THE FCST AREA DRY. TEMPS
WILL BE ABOUT THE SAME AS TODAY WITH MORE SUN...BUT LOWER DEWPOINTS.

&&

.SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/...
AS OF 130 PM TUESDAY...THE SHORT TERM FCST PICKS UP AT 00Z ON
THURSDAY WITH THE AXIS OF THE GREAT LAKES UPPER TROF TO OUR NORTH
WITH NUMEROUS SHORTWAVES MOVING INTO THE REGION FROM THE WEST. THE
UPPER TROF BEGINS TO LIFT NORTHWARD ON THURS AS THE UPPER RIDGE
SLOWLY BUILDS TO OUR WEST. LATE WEDNESDAY INTO THURSDAY...THE
FRONTAL BOUNDARY WILL BE TO OUR SE BY LATE WED WITH COOLER AND DRIER NW FLOW
IN ITS WAKE. AS THE SFC HIGH BEGINS TO MOVE EASTWARD...LOW LVL FLOW
WILL QUICKLY BECOME NORTHERLY AND THEN TRANSITION TO LIGHT AND
VARIABLE BY THURS AFTERNOON. MODELS CONTINUE TO SUGGEST THAT A WEAK
MESO LOW COULD DEVELOP JUST TO OUR EAST WITH SOME SORT OF
MCS/MCV...ASSOCIATED WITH AN UPPER LVL SHORTWAVE...DEVELOPING OVER
TENN AND ADVECTING INTO OUR CWFA BY LATE AFTERNOON. RIGHT
NOW...MODELS SOUNDINGS DO HAVE SOME SFC BASED INSTABILITY AND SMALL
AMOUNTS OF HELICITY BUT IT PROBABLY WONT BE ENOUGH TO PRODUCE ANY
SVR CONVECTION. TEMPS SHOULD BE A FEW DEGREES COOLER THAN THE
PREVIOUS DAY WITH HIGHS IN THE LOWER 90S. ON FRIDAY...THE CENTER OF
THE SFC HIGH WILL SLIDE FARTHER EAST WITH MOSTLY LIGHT AND VRB WINDS
NEAR THE SFC. EXPECT PROFILES TO BE DRIER OVER THE FCST AREA...BUT
WITH BETTER INSTABILITY THE POTENTIAL FOR PULSE TYPE SVR CONVECTION
SHOULD BE GREATER. TEMPS ARE EXPECTED TO BE VERY SIMILAR TO THE
PREVIOUS DAY WITH HIGHS NEAR CLIMO...IF NOT A DEGREE OR 2 ABOVE.

&&

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
AS OF 130 PM TUESDAY...THE MEDIUM RANGE MODELS ARE IN GOOD AGREEMENT
WITH THE MID LEVEL PATTERN LATE THIS WEEK...INDICATING A L/W RIDGE
ACROSS THE ROCKIES AND A DIGGING TROF ACROSS THE GREAT LAKES REGION.
BROAD LIFT ASSOCIATED WITH THE APPROACHING MID LEVEL TROF WILL
INCREASE ACROSS THE CWA THROUGH THE DAY ON SATURDAY. FORECAST
SOUNDINGS INDICATE THAT DECENT LAPSE RATES WILL DEVELOP BETWEEN THE
SFC AND H5 AS THE TROF APPROACHES AND THE CWA REMAINS IN THE WARM
SECTOR...WITH CAPE VALUES AROUND 1K J/KG. GIVEN THE LARGE SCALE LIFT
AND ADEQUATE INSTABILITY I WILL MAINTAIN A DEVELOPING SOLID CHC POPS
ACROSS THE CWA SATURDAY AFTERNOON AND EVENING.

THE PEAK OF THE MID LEVEL LIFT IS EXPECTED TO MOVE ACROSS THE
SOUTHERN APPALACHIAN REGION SATURDAY NIGHT. FORECAST SOUNDINGS
CONTINUE TO INDICATE FAIRLY STEEP LAPSE RATES AND ELEVATED
INSTABILITY DURING THE NIGHT. CONVECTION THAT INITIATES OVER THE
REGION ON FRIDAY WILL LIKELY PERSISTS OVER THE CWA THROUGH THE
NIGHT. IN FACT...GIVEN THE DEGREE AND DURATION OF THE LIFT AND
INCREASING STEERING FLOW IT APPEARS THAT SHRA/TSRA COVERAGE WILL
INCREASE DURING THE NIGHT. I WILL INCREASE POPS TO HIGH CHC NORTH TO
SOLID CHC SOUTH. A SIGNIFICANT SFC FRONT IS EXPECTED TO SWEEP WEST
TO EAST ACROSS THE REGION SUNDAY MORNING. BY DAYBREAK SUN...THE FRONT MAY
RUN ALONG THE EAST FACING SLOPES OF THE MTNS. AREAS ALONG AND AHEAD
OF THE FRONT MAY DEVELOP STEEP LAPSE RATES...AROUND 9C/KM BETWEEN
THE SFC AND H7. I WILL MAINTAIN HIGH CHC POPS DURING THE MORNING AND
INDICATE DECREASING POPS THROUGH THE DAY AS THE FRONT PUSHES EAST.

ON MONDAY...0Z ECMWF IS CONSIDERABLY SLOWER THE GFS. USING A BLEND
OF BOTH SOLUTIONS...LINGERING MOISTURE AND WEAK INSTABILITY MAY
SUPPORT A FEW SHRA/TSRA. I WILL KEEP A DIURNAL SCHC POP ACROSS THE
REGION. ON TUESDAY...THE ATMOSPHERE WILL DRY AS LARGE HIGH PRESSURE
PIVOTS OVER THE MID ATLANTIC REGION. LLVL WINDS SHOULD BECOME
EAST...RESULTING IN A LARGE AREA OF UPSLOPE FLOW ACROSS THE MTNS.
WEAK INSTABILITY...UPSLOPE FLOW...AND RIDGETOP CONVERGENCE MAY YIELD
A FEW HIGH TERRAIN SHRA/TSRA DURING THE AFTERNOON AND EARLY EVENING.
I WILL INDICATE SCHC POPS ACROSS THE MTNS AND DRY CONDITIONS EAST.

TEMPERATURES ACROSS THE CWA MAY BEGIN THE PERIOD ON SATURDAY
SLIGHTLY BELOW NORMAL AND END THE PERIOD AROUND NORMAL ON TUESDAY.

&&

.AVIATION /19Z TUESDAY THROUGH SUNDAY/...
AT KCLT...VFR THROUGH THE PERIOD. HIGH CLOUDS WILL MOVE OVERHEAD FOR
THE NEXT FEW HOURS. AFTER 21Z...EXPECT SOME DEEP CONVECTION TO FIRE
OVER THE PIEDMONT OF THE CAROLINAS...MOST LIKELY TO THE SOUTH OF THE
AIR FIELD ALONG A LEE TROF. WILL INCLUDE A FEW CB. CONVECTION WILL
DIMINISH BY MID EVENING...AFTER WHICH SKY WILL BE MOSTLY CLEAR. WIND
WILL GENERALLY BE OUT OF THE NW THIS AFTERNOON AND THEN SHOULD VEER
TO N TONIGHT AND NE AFTER SUNRISE. SPEED SHOULD BE LIGHT.

ELSEWHERE...SCATTERED TSTMS ARE STILL EXPECTED TO DEVELOP OVER NE
GEORGIA AND THE WRN PART OF THE UPSTATE IN THE LATE AFTERNOON...
ALTHO CONFIDENCE CONTINUES TO DROP AS THE MODELS FAIL TO DEVELOP
MUCH OF ANYTHING. WINDS WILL ONCE AGAIN HAVE A WESTERLY COMPONENT
DURING THE AFTERNOON...GRADUALLY VEERING TO THE NW AT LIGHT SPEEDS
TONIGHT. SKY SHOULD CLEAR BY MID EVENING. EXPECT A LIGHT N OR NE
WIND ON WEDNESDAY.

OUTLOOK...MAINLY VFR WEDNESDAY AFTERNOON AND NIGHT. SCATTERED TSTMS
POSSIBLE OVER THE HIGHER TERRAIN THURSDAY AFTERNOON AND EVENING. VFR
AGAIN FRIDAY. THUNDERSTORMS WILL BE MORE NUMEROUS SATURDAY AND
SUNDAY.

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...ZH
NEAR TERM...PM
SHORT TERM...JPT
LONG TERM...NED
AVIATION...PM

Hazardous weather outlook, Aug 9, 3:16 PM EDT, 1 hour 16 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
316 PM EDT TUE AUG 9 2011

GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065-
068>072-082-501>510-SCZ001>014-019-101930-
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-
316 PM EDT TUE AUG 9 2011

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE ACROSS THE REGION
THIS AFTERNOON AND EVENING. A FEW OF THESE STORMS MAY BECOME
SEVERE...WITH DAMAGING WIND GUSTS BEING THE PRIMARY THREAT.

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

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

NONE.

JPT

In the hours before

Local storm report, Aug 9, 2:16 PM EDT, 2 hours 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
216 PM EDT TUE AUG 09 2011

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

0410 PM     TSTM WND DMG     4 SSW TOCCOA            34.53N 83.35W
08/08/2011                   STEPHENS           GA   TRAINED SPOTTER

            TRAINED SPOTTER REPORTED THE TOPS OF PINE TREES SNAPPED
            OFF AT NEIGHBORS HOUSE ON N HICKS RD. ALSO REPORTED TWO
            TREES DOWN AT N HICKS RD AND GARLAND RD.

&&

ZHARGROV

Local storm report, Aug 9, 3:10 PM EDT, 1 hour 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
310 PM EDT TUE AUG 09 2011

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

0730 PM     TSTM WND DMG     1 SSE STANLEY           35.34N 81.09W
08/08/2011                   GASTON             NC   BROADCAST MEDIA

            MULTIPLE TREES WERE BLOWN DOWN IN THE JACKSON PARK
            COMMUNITY OF STANLEY...WITH AT LEAST ONE TREE ON A HOME.
            ANOTHER TREE FELL ON RAILROAD TRACKS IN THE AREA...AND A
            TRAIN LATER COLLIDED WITH IT.

&&

LANE

Special weather statement, Aug 9, 4:27 PM EDT, 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
427 PM EDT TUE AUG 9 2011

GAZ026-028-092100-
FRANKLIN-HART-
427 PM EDT TUE AUG 9 2011

...A STRONG THUNDERSTORM WILL AFFECT FRANKLIN AND HART COUNTIES
THROUGH 5 PM...

AT 426 PM...NATIONAL WEATHER SERVICE RADAR INDICATED A STRONG
THUNDERSTORM CAPABLE OF PRODUCING WINDS UP TO 50 MPH. THE STORM WAS
7 MILES WEST OF CARNESVILLE...MOVING SOUTHEAST AT 25 MPH.

LOCATIONS TO BE AFFECTED INCLUDE...

ROYSTON...
VANNA...

LANE

Special weather statement, Aug 9, 4:32 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
432 PM EDT TUE AUG 9 2011

GAZ026-028-092100-
FRANKLIN-HART-
432 PM EDT TUE AUG 9 2011

...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN FRANKLIN AND
SOUTHWESTERN HART COUNTIES THROUGH 500 PM EDT...

AT 426 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 6 MILES SOUTHWEST OF CARNESVILLE...MOVING EAST AT
25 MPH.

THIS STORM WILL BE NEAR...
  CARNESVILLE...
  ROYSTON...
  VANNA...

WIND GUSTS OF 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3426 8313 3423 8317 3424 8326 3426 8329
      3424 8335 3426 8334 3431 8339 3442 8334
      3434 8294 3423 8305 3422 8307

LANE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 8:09 PM EDT	Severe Thunderstorm Warning	GSP	Union	66 min
Aug 9, 5:47 PM EDT	Severe Thunderstorm Warning	GSP	Abbeville	43 min
Aug 9, 5:05 PM EDT	Severe Thunderstorm Warning	GSP	Elbert, Hart	55 min

Nearby

Special Weather Statements in Georgia, 2011 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.