Alert archive / South Carolina / Special Weather Statements in 2012

Special Weather Statement, NWS Wilmington, NC

August 17, 2012Horry County, South Carolina

NWS Wilmington, NC issued this special weather statement at Aug 17, 2012, 5:56 PM EDT for Horry County, South Carolina. It was in force for 34 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 17, 2012, 5:56 PM EDT (21:56 UTC)
Expired: Aug 17, 2012, 6:30 PM EDT
In force: 34 min
Issued by: NWS Wilmington, NC

County Horry County, SC

The radar

The Wilmington radar (KLTX), 66 km from the middle of the area, began a volume at 21:58 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

Charleston AFB, SC (KCHS), launched 12:00Z, 9.9 hours before the alert went out and 147 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: 894 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1044 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 67 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 Wilmington, NC wrote its last area forecast discussion before this special weather statement went out at Aug 17, 2:56 PM EDT, 3 hours earlier.

Area forecast discussion, Aug 17, 2:56 PM EDT, 3 hours before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON NC
256 PM EDT FRI AUG 17 2012

.SYNOPSIS...
RAIN CHANCES WILL INCREASE OVER THE WEEKEND AS A SLOW MOVING COLD
FRONT MOVES INTO THE REGION AND OFF THE COAST SUNDAY. THIS BOUNDARY
WILL THEN RETURN OVER LAND BY MONDAY...KEEPING WEATHER CONDITIONS
UNSETTLED ACROSS THE AREA THROUGH EARLY NEXT WEEK.

&&

.NEAR TERM /THROUGH TONIGHT/...
AS OF 230 PM FRIDAY...EXTENSIVE CU FIELD HAS DEVELOPED OVER MOST ALL
OF THE CWA WITH THE EXCEPTION OF ALONG THE BRUNSWICK COUNTY
COASTLINE...WHERE THE SEA BREEZE FRONT HAS PUSHED WELL NORTH.
ANALYSIS OF AREA SOUNDINGS AND CURRENTLY OBSERVED RATE OF
DEVELOPMENT PROMPTED SPREADING ISOLATED POPS THROUGHOUT THE ENTIRE
FORECAST AREA FOR THE REMAINDER OF THIS AFTERNOON AND THIS EVENING.
WIDELY SCATTERED CONVECTION IS APPROACHING FROM THE WEST AT THIS
TIME...SO WILL ALSO BE INCREASING POPS FOR OUR WESTERN ZONES TO AT
LEAST 30 PERCENT.

GUIDANCE MORE BULLISH ON PRECIPITATION OVERNIGHT. DEEPENING MOISTURE
AND LARGE SCALE ASCENT IN ADVANCE OF IMPENDING COLD FRONT WILL LEAD
TO AT LEAST THE SLIGHT CHANCE FOR SHOWERS AND THUNDERSTORMS BY
DAYBREAK ON SATURDAY. P/W VALUES INCREASE BY A HALF INCH TO AROUND
2.00 INCHES OVERNIGHT...WITH COLUMN BECOMING NEARLY SATURATED IN THE
EARLY MORNING HOURS.

MODEL CONSENSUS KEEPS TEMPERATURES CLOSE TO SEASONAL FOR ANOTHER
NIGHT...WITH OVERNIGHT MINIMUMS IN THE LOWER 70S MOST
LOCATIONS...AND MID 70S AT THE BEACHES.

&&

.SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/...
AS OF 230 PM FRIDAY...BROAD UPPER TROUGH FROM LARGE UPPER LOW IN THE
VICINITY OF HUDSON BAY ON SATURDAY WILL BE THE MAIN WX FEATURE. THE
UPPER TROUGH AXIS WILL HANG BACK WEST OF THE REGION ALLOWING WEAK
VORTS TO TREK BY THE REGION. H3 JET POSITIONING FAVORS WEAK
DIVERGENCE ALOFT ALONG WITH A SLOW MOVING COLD FRONT SUPPORT THE
DEVELOPMENT OF SCATTERED TSTMS DURING SATURDAY. SPC HIGHLIGHTS THE
FORECAST IN A SLIGHT RISK...BUT ULTIMATELY THIS MAY DEPEND ON THE
DEGREE OF INSOLATION THE ARE RECEIVES AHEAD OF THE SYNOPTIC
BOUNDARY. THE BOUNDARY WILL TEMPORARILY PUSH OFF THE COAST SUNDAY
MORNING THEN DRIFT BACK INTO THE VICINITY DURING THE DAY. THE RETURN
OF INSTABILITY DURING SUNDAY SUPPORTS AT LEAST THE DEVELOPMENT OF
WIDELY SCATTERED TO SCATTERED CONVECTION DURING PEAK HEATING.
TEMPERATURES ARE EXPECTED TO HOVER WITHIN A COUPLE DEGREES OF CLIMO
EACH PERIOD.

&&

.LONG TERM /MONDAY THROUGH FRIDAY/...
AS OF 230 PM FRIDAY...LONG TERM SOLUTIONS CONTINUE TO BE CONSISTENT
IN KEEPING THE AREA GENERALLY MORE UNSETTLED EARLY IN THE PERIOD. IT
APPEARS LINGERING FRONT WILL LACK THE UPPER SUPPORT TO MOVE ACROSS
THE AREA UNTIL IT ALL BUT LOSES DEFINITION. INCREASED POPS
INCREMENTALLY THROUGHOUT THE EARLY PERIODS...MONDAY THROUGH
WEDNESDAY AND ADJUSTED MAX TEMPERATURES DOWN AND LOW TEMPERATURES
UP. A SECONDARY SHORTWAVE...DIVING OR MORE LIKE WOBBLING ACROSS THE
CENTRAL PLAINS WILL BE THE IMPETUS FOR SUBTLE RIDGING ACROSS OUR
AREA LATE IN THE PERIOD WHEN POPS DECREASE. ALL OF THIS IS GENERALLY
FOLLOWING HPC WHICH FAVORS THE ECMWF.

&&

.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
AS OF 18Z...THINGS WILL BE FAIRLY QUIET THROUGH EARLY
AFTERNOON...WITH WEAK SUBSIDENCE AND NOT VERY MUCH DEEP MOISTURE.
THE MOISTURE WILL BE ON THE INCREASE LATER THIS
AFTERNOON...PARTICULARLY IN SOUTH CAROLINA...WITH MOIST SOUTHWEST
FLOW USHERING IN SCATTERED CONVECTION BY LATE AFTERNOON. LOOK FOR
POSSIBLE HEAVY SHOWERS TO MOVE INTO THE WESTERN TERMINALS AROUND
01Z...CONTINUING INTERMITTENTLY THROUGH THE OVERNIGHT
HOURS...REACHING THE COAST TOWARD MORNING. MODERATE UNCERTAINTY WITH
RESPECT TO TIMING AND COVERAGE. BRIEF IFR CONDITIONS DUE TO
VISIBILITY IN THE HEAVIER PRECIPITATION. SCATTERED SHOWERS WILL
CONTINUE SATURDAY...MAINLY NEAR THE COAST WITH SOUTHWEST FLOW.

EXTENDED OUTLOOK...SCATTERED SHOWERS/ISOLATED THUNDERSTORMS WITH
TEMPO MVFR/IFR THROUGH MONDAY. ISOLATED SHOWERS AND THUNDERSTORMS
TUESDAY AND WEDNESDAY.

&&

.MARINE...
NEAR TERM /THROUGH TONIGHT/...
AS OF 230 PM FRIDAY...BERMUDA HIGH PRESSURE TO THE EAST AND AN
APPROACHING COLD FRONT TO THE WEST WILL KEEP UP A SOUTHWESTERLY FLOW
IN THE 10 TO 15 KT RANGE THROUGH THE NEAR TERM...WITH SEAS IN THE 2
TO 3 FT RANGE.

SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/...
AS OF 230 PM FRIDAY...SOUTHWESTERLY FLOW WILL PREVAIL ACROSS ALL OF
THE COASTAL WATERS SATURDAY WITH SPEEDS 10-15 KNOTS OR LESS. A WEAK
COLD FRONT WILL PUSH TOWARD THE COAST SATURDAY NIGHT THEN BRIEFLY
OFFSHORE SUNDAY MORNING BEFORE DRIFTING BACK TO THE NORTH. THUS...A
BRIEF PERIOD OF LIGHT NORTHERLY WINDS SUNDAY MORNING WILL VEER
AROUND TO AN ONSHORE DIRECTION DURING THE DAY...THEN TO THE
SOUTHWEST BY SUNDAY EVENING. OVERALL...THE SIGNIFICANT WAVE HEIGHT
WILL BE AROUND 3 FT AWAY FROM THE COAST THROUGH THE PERIOD...
POSSIBLY TO AROUND 4 FT SUNDAY EVENING FOR THE OUTER CAPE FEAR
WATERS IF THE FRONT NUDGES BACK TO THE NORTH AS ANTICIPATED. COULD
SEE ROUNDS OF CONVECTION EACH NIGHT...AND MORE-SO DURING THE EARLY
MORNING.

LONG TERM /MONDAY THROUGH WEDNESDAY/...
AS OF 3 PM FRIDAY...SOUTHWEST FLOW WILL CONTINUE FOR MOST OF THE
PERIOD. WIND SHIFT NOW IS DELAYED UNTIL WEDNESDAY MORNING AS WHAT IS
LEFT OF A FRONT MOVES OFF TO THE SOUTHEAST. STANDARD LATE SUMMER
WIND SPEEDS OF 10-15 KNOTS UNTIL THEN. PUSH BEHIND THE FRONT IS
ALMOST NON EXISTENT AND WILL BE TEN KNOTS AT BEST. WAVEWATCH SEAS
WERE NOT USED FOR THIS CYCLE AS THEY APPEAR DISTORTED FROM
CONVECTIVE ACTIVITY LATE IN THE PERIOD AND MAINTAINED THE 2-3
FOOTERS.

&&

.ILM WATCHES/WARNINGS/ADVISORIES...
SC...NONE.
NC...NONE.
MARINE...NONE.

&&

NEAR TERM...REK
SHORT TERM...SRP
LONG TERM...SHK
AVIATION...DL/REK

Hazardous weather outlook, Aug 17, 4:14 PM EDT, 1 hour 42 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE WILMINGTON NC
414 PM EDT FRI AUG 17 2012

NCZ087-096-099-105>110-SCZ017-023-024-032-033-039-053>056-182015-
ROBESON-BLADEN-COLUMBUS-INLAND PENDER-COASTAL PENDER-
INLAND NEW HANOVER-COASTAL NEW HANOVER-INLAND BRUNSWICK-
COASTAL BRUNSWICK-MARLBORO-DARLINGTON-DILLON-FLORENCE-MARION-
WILLIAMSBURG-INLAND HORRY-COASTAL HORRY-INLAND GEORGETOWN-
COASTAL GEORGETOWN-
414 PM EDT FRI AUG 17 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST NORTH CAROLINA AND
NORTHEAST SOUTH CAROLINA.

.DAY ONE...TONIGHT.

ISOLATED STRONG THUNDERSTORMS MAY BRIEFLY REACH SEVERE LEVELS
THROUGH THIS EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE SATURDAY AFTERNOON AND
EVENING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS REQUESTED.

AMZ250-252-254-256-182015-
SURF CITY TO CAPE FEAR NC OUT 20 NM-
CAPE FEAR NC TO LITTLE RIVER INLET SC OUT 20 NM-
LITTLE RIVER INLET TO MURRELLS INLET SC OUT 20 NM-
MURRELLS INLET TO SOUTH SANTEE RIVER SC OUT 20 NM-
414 PM EDT FRI AUG 17 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ADJACENT COASTAL WATERS.

.DAY ONE...TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE SATURDAY AFTERNOON AND
EVENING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT REQUESTED AT THIS TIME.

RJD

In the hours before

Special weather statement, Aug 17, 4:32 PM EDT, 1 hour 24 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON NC
432 PM EDT FRI AUG 17 2012

SCZ024-033-053-172130-
DILLON-INLAND HORRY-MARION-
432 PM EDT FRI AUG 17 2012

...STRONG THUNDERSTORMS WILL MOVE ACROSS HORRY...MARION AND DILLON
COUNTIES THROUGH 530 PM EDT...

AT 432 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS OVER
WEST MARION...OR ABOUT OVER MARION...MOVING EAST AT 15 MPH.

SOME LOCATIONS IMPACTED INCLUDE MARION...MULLINS...BLUE BRICK...
FLOYDALE...FORK...GAPWAY...KEMPER...LAKE VIEW...SELLERS...
SMITHBORO...WEST MARION AND ZION.

HAZARDS INCLUDE...
HALF INCH DIAMETER SIZE HAIL.
GUSTY WINDS OF 40 TO 50 MPH.

THUNDERSTORMS CAN POSE A VARIETY OF THREATS INCLUDING GUSTY WINDS...
SMALL HAIL...CLOUD TO GROUND LIGHTNING...AND LOCALIZED FLOODING. IT
IS RECOMMENDED THAT YOU REMAIN INDOORS UNTIL THE STORMS PASS.

&&

LAT...LON 3431 7909 3415 7905 3411 7950 3429 7955
      3440 7919
TIME...MOT...LOC 2032Z 257DEG 9KT 3422 7942

15

Special weather statement, Aug 17, 5:07 PM EDT, 49 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON NC
507 PM EDT FRI AUG 17 2012

SCZ039-055-056-172200-
COASTAL GEORGETOWN-INLAND GEORGETOWN-WILLIAMSBURG-
507 PM EDT FRI AUG 17 2012

...STRONG THUNDERSTORMS WILL MOVE ACROSS GEORGETOWN AND WILLIAMSBURG
COUNTIES THROUGH 600 PM EDT...

AT 507 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS OVER
TRIO...OR ABOUT 11 MILES EAST OF SAINT STEPHEN...MOVING EAST AT 15
MPH.

SOME LOCATIONS IMPACTED INCLUDE ANDREWS...EARLE...LAMBERT...NORTH
SANTEE...SAMPIT...TRIO AND WARSAW.

HAZARDS INCLUDE...
PEA SIZE HAIL.
GUSTY WINDS OF 30 TO 40 MPH.

THUNDERSTORMS CAN POSE A VARIETY OF THREATS INCLUDING GUSTY WINDS...
SMALL HAIL...CLOUD TO GROUND LIGHTNING...AND LOCALIZED FLOODING. IT
IS RECOMMENDED THAT YOU REMAIN INDOORS UNTIL THE STORMS PASS.

&&

LAT...LON 3318 7940 3320 7942 3321 7945 3323 7946
      3324 7953 3327 7957 3329 7966 3332 7970
      3332 7974 3337 7979 3337 7981 3354 7983
      3356 7937 3316 7935
TIME...MOT...LOC 2107Z 256DEG 11KT 3345 7973

15

Local storm report, Aug 17, 5:26 PM EDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON NC
526 PM EDT FRI AUG 17 2012

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

0440 PM     TSTM WND DMG     1 NNW KINGSTREE         33.67N  79.84W
08/17/2012                   WILLIAMSBURG       SC   911 CALL CENTER

            TREES DOWN.

&&

EVENT NUMBER ILM1200319

ROSS

Local storm report, Aug 17, 5:29 PM EDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON NC
529 PM EDT FRI AUG 17 2012

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

0511 PM     TSTM WND DMG     3 WNW TRIO              33.50N  79.76W
08/17/2012                   WILLIAMSBURG       SC   911 CALL CENTER

            TREES DOWN.

&&

EVENT NUMBER ILM1200320

ROSS

Special weather statement, Aug 17, 5:33 PM EDT, 23 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON NC
533 PM EDT FRI AUG 17 2012

SCZ033-053>055-172230-
COASTAL HORRY-INLAND GEORGETOWN-INLAND HORRY-MARION-
533 PM EDT FRI AUG 17 2012

...A STRONG THUNDERSTORM WILL MOVE ACROSS GEORGETOWN...HORRY AND
MARION COUNTIES THROUGH 630 PM EDT...

AT 533 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 12
MILES WEST OF DONGOLA...OR ABOUT 20 MILES SOUTHWEST OF CONWAY...
MOVING EAST AT 15 MPH.

SOME LOCATIONS IMPACTED INCLUDE CONWAY...BUCKSPORT...BUCKSVILLE...
DONGOLA...HICKORY GROVE...HOMEWOOD...PEE DEE CROSSROADS AND
YAUHANNAH.

HAZARDS INCLUDE...
PEA SIZE HAIL.
GUSTY WINDS OF 30 TO 40 MPH.

THUNDERSTORMS CAN POSE A VARIETY OF THREATS INCLUDING GUSTY WINDS...
SMALL HAIL...CLOUD TO GROUND LIGHTNING...AND LOCALIZED FLOODING. IT
IS RECOMMENDED THAT YOU REMAIN INDOORS UNTIL THE STORMS PASS.

&&

LAT...LON 3364 7936 3372 7938 3377 7934 3378 7933
      3378 7932 3380 7933 3382 7931 3389 7905
      3362 7901
TIME...MOT...LOC 2133Z 263DEG 9KT 3372 7937

15

Special weather statement, Aug 17, 5:56 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON NC
556 PM EDT FRI AUG 17 2012

SCZ053-172230-
INLAND HORRY-
556 PM EDT FRI AUG 17 2012

...STRONG THUNDERSTORMS WILL MOVE ACROSS HORRY COUNTY THROUGH 630 PM
EDT...

AT 556 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS OVER
AYNOR...OR ABOUT 11 MILES NORTHWEST OF CONWAY...MOVING EAST AT 15
MPH.

SOME LOCATIONS IMPACTED INCLUDE ADRIAN...ALLSBROOK...BAYBORO...
GALIVANTS FERRY...HORRY AND AYNOR.

HAZARDS INCLUDE...
PEA SIZE HAIL.
GUSTY WINDS OF 40 TO 50 MPH.

THUNDERSTORMS CAN POSE A VARIETY OF THREATS INCLUDING GUSTY WINDS...
SMALL HAIL...CLOUD TO GROUND LIGHTNING...AND LOCALIZED FLOODING. IT
IS RECOMMENDED THAT YOU REMAIN INDOORS UNTIL THE STORMS PASS.

&&

LAT...LON 3405 7926 3407 7925 3412 7893 3390 7890
      3388 7924
TIME...MOT...LOC 2156Z 263DEG 10KT 3399 7915

15

The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 17, 3:54 PM EDT	Special Weather Statement	ILM	Florence, Williamsburg	66 min
Aug 17, 3:58 PM EDT	Severe Thunderstorm Warning	ILM	Dillon, Florence, Marion	62 min
Aug 17, 4:12 PM EDT	Severe Thunderstorm Warning	ILM	Williamsburg	63 min
Aug 17, 4:21 PM EDT	Special Weather Statement	ILM	Marlboro	54 min
Aug 17, 4:23 PM EDT	Severe Thunderstorm Warning	ILM	Marlboro	32 min
Aug 17, 4:32 PM EDT	Special Weather Statement	ILM	Dillon	58 min
Aug 17, 4:48 PM EDT	Areal Flood Advisory	ILM	Darlington, Dillon, Florence, Marion, Marlboro	117 min
Aug 17, 5:07 PM EDT	Special Weather Statement	ILM	Georgetown	53 min
Aug 17, 5:33 PM EDT	Special Weather Statement	ILM	Horry	57 min
Aug 17, 6:09 PM EDT	Severe Thunderstorm Warning	ILM	Horry	36 min
Aug 17, 6:12 PM EDT	Special Weather Statement	ILM	Georgetown	63 min
Aug 17, 6:32 PM EDT	Special Weather Statement	ILM	Horry	28 min
Aug 17, 6:53 PM EDT	Special Weather Statement	ILM	Darlington, Marlboro	67 min
Aug 17, 7:57 PM EDT	Special Weather Statement	ILM	Darlington, Marlboro	63 min

Nearby

Special Weather Statements in South Carolina, 2012 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.