Special Weather Statement, NWS Columbia, SC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE COLUMBIA SC
1035 PM EDT THU MAY 31 2012

.SYNOPSIS...
A COLD FRONT WILL COME THROUGH FRIDAY...BRINGING A CHANCE OF SHOWERS
AND THUNDERSTORMS. THE FRONT WILL MOVE TO OUR EAST BY SATURDAY
MORNING...WITH WEAK DRY HIGH PRESSURE BUILDING IN TO PROVIDE FAIR
WEATHER FOR SATURDAY AND SUNDAY. A SERIES OF UPPER DISTURBANCES AND
SURFACE BOUNDARIES WILL PROVIDE A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS EARLY TO MID NEXT WEEK.

&&

.NEAR TERM /THROUGH FRIDAY/...
TONIGHT...APPARENTLY ENOUGH ENERGY IN THE ATMOSPHERE TO ALLOW A
SMALL CONVECTIVE COMPLEX TO IN NE GA AND NW SC IN THE NORTHERN
PART OF THE CSRA. HAVE UPPED POPS THERE TO 50-60 PERCENT. NOT
OUTLOOKED AND EXPECT CHANCE OF SEVERE STORMS TO BE MINIMAL. DID
ISSUE 2 SPS FOR STRONG STORMS AS VILS GOT CLOSE TO 40. THE
COMPUTED VIL OF THE DAY WAS 60. THIS ACTIVITY MAY LAST ANOTHER
2-3 HOURS BEFORE IT DIES OFF. STILL KEPT A 20-30 PERCENT CHANCE
AFTER MIDNIGHT. OTHERWISE...PARTLY TO MOSTLY CLOUDY SKIES WITH
WEAK HIGH PRESSURE OVER THE AREA. UPPER LEVEL TROUGH EXTENDING
FROM THE MID- WEST THROUGH THE MS RIVER VALLEY TO THE GULF COAST
PRODUCING SOUTHWEST FLOW ALOFT.

FRIDAY...A PAIR OF UPPER DISTURBANCES TO OUR WEST WILL MOVE THROUGH
FRIDAY. MODELS INDICATE THE APPEARANCE OF A WARM FRONT TYPE FEATURE
TO SHIFT NE ACROSS THE FORECAST AREA EARLY FRIDAY MORNING PROVIDING
A CHANCE OF SHOWERS AND POSSIBLY A THUNDERSTORM. THE MAIN FRONT WILL
ROLL THROUGH LATE IN THE DAY FRIDAY. MODERATE INSTABILITIES ALONG
WITH MODERATE LOW TO MID LEVEL JETS SUGGEST SOME POTENTIAL FOR
SEVERE. SPC HAS REGION IN SLIGHT RISK.

&&

.SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY NIGHT/...
COLD FRONT PUSHES INTO REGION FRIDAY NIGHT. MODELS INDICATE FRONT
TO HAVE PUSHED TO OUR EAST BY SATURDAY MORNING...WITH DRIER AIR
ENTERING THE REGION. A WEAK POST FRONTAL SURFACE TROUGH WILL SWING
THROUGH FROM THE NORTH DURING THE DAY SATURDAY...WITH WEAK HIGH
PRESSURE BUILDING IN BEHIND IT FOR SATURDAY AND SATURDAY NIGHT.

&&

.LONG TERM /SUNDAY THROUGH THURSDAY/...
SOME UPPER ENERGY WILL RIDE BY TO OUR NORTH SUNDAY. DRY AIR
EXPECTED TO PREVENT PRECIPITATION FOR OUR FA SAT/SUN. GFS/ECMWF
INDICATE UPPER LOW TO MEANDER FOR A WHILE NEAR NEW ENG/CANADIAN
MARITIMES...WITH UPPER RIDGE OVER CENT NOAM. BOTH MODELS SUGGEST
AN UPPER DISTURBANCE AND FRONTAL BOUNDARY...ALONG WITH SOME
INCREASE IN MOISTURE...TO PROVIDE CHANCE OF PRECIP LATE MON INTO
TUE TIME FRAME. IT APPEARS A SERIES OF UPPER DISTURBANCES WILL
CONTINUE TO ROTATE AROUND THE UPPER LOW THROUGH OUR REGION THROUGH
MID WEEK. A N TO NW FLOW ALOFT IS USUALLY A DRY FLOW FOR OUR
REGION...BUT IN THE WARM SEASON WITH SUFFICIENT MOISTURE
AVAILABLE...A CHANCE OF CONVECTION PLAUSIBLE. HPC AND GFS ENSEMBLE
MOS GUIDANCE GENERALLY SUGGEST SLIGHT CHANCE POPS...WHILE
EXPERIMENTAL ECMWF MOS SUGGESTS CHANCE A LITTLE HIGHER.

&&

.AVIATION /03Z FRIDAY THROUGH TUESDAY/...
ACTIVITY NORTH OF AGS AND DNL NOT EXPECTED TO IMPACT THOSE
TAF SITES. OTHERWISE...VFR THROUGH MOST OF THE NIGHT. MODELS
SHOWING MIXED SIGNALS AS FOR CONDITIONS AFTER MIDNIGHT. WARM FRONT
APPEARS TO LIFT NORTH INTO THE AREA TONIGHT. MVFR CIGS/VSBYS ALONG
WITH A FEW SHOWERS POSSIBLE. HAVE INCLUDED MVFR CONDITION 08Z-14Z
IN TAFS GIVEN MEDIUM AVERAGE CONFIDENCE. BY 14Z- 15Z EXPECTING VFR
TO RETURN. MAY SEE CONVECTION DEVELOPING TOWARD THE END OF THE TAF
PERIOD IN ADVANCE OF A COLD FRONT. GUSTY SOUTHWEST WINDS EXPECTED
TO DEVELOP AFTER 14Z.

EXTENDED AVIATION OUTLOOK...MVFR TO IFR CONDITIONS POSSIBLE FRIDAY
AFTERNOON INTO FRIDAY NIGHT AS A FRONTAL SYSTEM MOVES THROUGH THE
AREA PRODUCING CONVECTION.

&&

.CAE WATCHES/WARNINGS/ADVISORIES...
SC...NONE.
GA...NONE.
&&

SYNOPSIS...07
NEAR TERM...07
SHORT TERM...
LONG TERM...
AVIATION...07

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE COLUMBIA SC
425 AM EDT THU MAY 31 2012

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-010830-
LINCOLN-MCDUFFIE-COLUMBIA-RICHMOND-BURKE-LANCASTER-CHESTERFIELD-
MCCORMICK-NEWBERRY-FAIRFIELD-KERSHAW-EDGEFIELD-SALUDA-LEXINGTON-
RICHLAND-LEE-AIKEN-SUMTER-BARNWELL-ORANGEBURG-CALHOUN-CLARENDON-
BAMBERG-
425 AM EDT THU MAY 31 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL GEORGIA AND
CENTRAL SOUTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

A COLD FRONT IS FORECAST TO CROSS THE REGION FRIDAY AFTERNOON INTO
FRIDAY NIGHT. A FEW THUNDERSTORMS ASSOCIATED WITH THE FRONT MAY BECOME
SEVERE...PRODUCING DAMAGING WINDS AND LARGE HAIL FRIDAY AFTERNOON
INTO FRIDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED AT SOME POINT ON FRIDAY.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
557 PM EDT THU MAY 31 2012

GAZ077-312300-
BURKE-
557 PM EDT THU MAY 31 2012

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BURKE COUNTY THROUGH
700 PM EDT...

AT 555 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM...NEAR THE JENKINS AND BURKE COUNTY LINE...MOVING
NORTHEAST AT 20 MPH. THE STORM WILL AFFECT SOUTH-CENTRAL BURKE COUNTY.

THE STORM WILL LIKELY CONTAIN WIND GUSTS NEAR 45 MPH AND SMALL
HAIL...ALONG WITH HEAVY DOWNPOURS AND DANGEROUS LIGHTNING.

&&

LAT...LON 3281 8219 3308 8213 3298 8187 3292 8194
      3291 8209 3288 8212 3282 8214 3281 8215
      3281 8218
TIME...MOT...LOC 2155Z 206DEG 18KT 3286 8210

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
926 PM EDT THU MAY 31 2012

GAZ040-063-064-SCZ018-025-010230-
COLUMBIA-EDGEFIELD-LINCOLN-MCCORMICK-MCDUFFIE-
926 PM EDT THU MAY 31 2012

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF MCDUFFIE...LINCOLN...
COLUMBIA...EDGEFIELD AND MCCORMICK COUNTIES THROUGH 1030 PM EDT...

AT 920 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ENTERING MCDUFFIE AND LINCOLN COUNTY IN EAST
CENTRAL GEORGIA. THIS ACTIVITY WAS MOVING NORTHEAST 10 TO 15 MPH
AND MAY AFFECT COLUMBIA...MCCORMICK AND EDGEFIELD COUNTIES WITHIN
THE NEXT HOUR.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
EDGEFIELD...MCCORMICK...EVANS...GROVETOWN...HARLEM...LINCOLNTON AND
THOMSON...

PREPARE NOW FOR THE FOLLOWING HAZARDS...
GUSTY WINDS OF 30 TO 40 MPH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REPORT LARGE HAIL...DAMAGING WINDS OR FLOODING TO YOUR COUNTY
SHERIFF...OR CALL THE NATIONAL WEATHER SERVICE TOLL FREE AT 1...8 7
7...6 3 3...6 7 7 2.

&&

LAT...LON 3365 8259 3366 8250 3382 8260 3387 8258
      3387 8261 3398 8265 3397 8259 3401 8260
      3408 8253 3406 8237 3404 8232 3398 8230
      3401 8226 3379 8174 3331 8236 3334 8252
      3337 8256 3341 8255 3346 8260 3361 8265
TIME...MOT...LOC 0125Z 232DEG 17KT 3382 8290 3333 8244

TTH

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
1027 PM EDT THU MAY 31 2012

GAZ040-063-064-SCZ018-025-026-010330-
COLUMBIA-EDGEFIELD-LINCOLN-MCCORMICK-MCDUFFIE-SALUDA-
1027 PM EDT THU MAY 31 2012

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF MCDUFFIE...LINCOLN...
COLUMBIA...EDGEFIELD...MCCORMICK AND SALUDA COUNTIES THROUGH 1130 PM
EDT...

AT 1019 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
AN AREA OF THUNDERSTORMS IN MCDUFFIE...COLUMBIA AND LINCOLN COUNTIES
IN THE CENTRAL SAVANNAH RIVER AREA MOVING NORTHEAST AROUND 10 MPH.
THIS ACTIVITY WILL SPREAD INTO MCCORMICK,,,EDGEFIELD AND SALUDA
COUNTIES WITHIN THE NEXT HOUR.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
EDGEFIELD...JOHNSTON...MCCORMICK...SALUDA...EVANS...GROVETOWN...
HARLEM...LINCOLNTON...MARTINEZ AND THOMSON...

PREPARE NOW FOR THE FOLLOWING HAZARDS...
GUSTY WINDS OF 30 TO 40 MPH...
SMALL HAIL...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REPORT LARGE HAIL...DAMAGING WINDS OR FLOODING TO YOUR COUNTY
SHERIFF...OR CALL THE NATIONAL WEATHER SERVICE TOLL FREE AT 1...8 7
7...6 3 3...6 7 7 2.

&&

LAT...LON 3397 8259 3401 8260 3408 8253 3407 8233
      3398 8230 3402 8224 3398 8219 3399 8205
      3396 8202 3412 8188 3391 8158 3331 8235
      3335 8255 3362 8264 3365 8259 3366 8250
      3382 8260 3387 8258 3387 8261 3398 8265
TIME...MOT...LOC 0224Z 220DEG 19KT 3398 8256 3356 8215

TTH

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
1130 PM EDT THU MAY 31 2012

GAZ064-065-077-SCZ018-025-026-030-010430-
AIKEN-BURKE-COLUMBIA-EDGEFIELD-MCCORMICK-RICHMOND-SALUDA-
1130 PM EDT THU MAY 31 2012

...A LINE OF STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF
RICHMOND...BURKE...COLUMBIA...EDGEFIELD...MCCORMICK...SALUDA AND
AIKEN COUNTIES THROUGH 1230 AM EDT...

AT 1129 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS...ALONG A LINE EXTENDING FROM MCCORMICK TO 6
MILES NORTHEAST OF PARKSVILLE TO HEPHZIBAH...MOVING NORTHEAST AT 30
MPH.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
GLOVERVILLE...AIKEN...BELVEDERE...CLEARWATER...EDGEFIELD...
JOHNSTON...MCCORMICK...NEW ELLENTON...NORTH AUGUSTA...RIDGE SPRING...
SALUDA...AUGUSTA...EVANS...FORT GORDON...GROVETOWN...HEPHZIBAH AND
MARTINEZ...

PREPARE NOW FOR THE FOLLOWING HAZARDS...
GUSTY WINDS OF 40 TO 50 MPH...
PEA SIZE HAIL...
FREQUENT CLOUD TO GROUND LIGHTNING...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

REPORT LARGE HAIL...DAMAGING WINDS OR FLOODING TO YOUR COUNTY
SHERIFF...OR CALL THE NATIONAL WEATHER SERVICE TOLL FREE AT 1...8 7
7...6 3 3...6 7 7 2.

&&

LAT...LON 3399 8245 3405 8232 3398 8230 3402 8224
      3398 8219 3399 8215 3399 8205 3396 8202
      3414 8187 3417 8188 3418 8183 3404 8166
      3346 8161 3311 8220 3369 8225 3369 8223
      3378 8226
TIME...MOT...LOC 0329Z 243DEG 25KT 3397 8227 3383 8211
          3333 8207