Alert archive / South Carolina / Special Weather Statements in 2011

Special Weather Statement, NWS Wilmington, NC

August 20, 2011Williamsburg County, South Carolina

NWS Wilmington, NC issued this special weather statement at Aug 20, 2011, 1:25 PM EDT for Williamsburg County, South Carolina. It was in force for 65 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 20, 2011, 1:25 PM EDT (17:25 UTC)
Expired: Aug 20, 2011, 2:30 PM EDT
In force: 65 min
Issued by: NWS Wilmington, NC

County Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 127 km from the middle of the area, began a volume at 17:27 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, 5.4 hours before the alert went out and 71 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: 748 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1183 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 41 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 20, 10:45 AM EDT, 2 hours 40 minutes earlier.

Area forecast discussion, Aug 20, 10:45 AM EDT, 2 hours 40 minutes before

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Hazardous weather outlook, Aug 20, 10:10 AM EDT, 3 hours 15 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE WILMINGTON NC
1010 AM EDT SAT AUG 20 2011

AMZ250-252-254-256-NCZ087-096-099-105>107-109-110-SCZ017-023-024-032-
033-039-053>056-211415-
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-ROBESON-BLADEN-
COLUMBUS-INLAND PENDER-COASTAL PENDER-INLAND NEW HANOVER-
INLAND BRUNSWICK-COASTAL BRUNSWICK-MARLBORO-DARLINGTON-DILLON-
FLORENCE-MARION-WILLIAMSBURG-INLAND HORRY-COASTAL HORRY-
INLAND GEORGETOWN-COASTAL GEORGETOWN-
1010 AM EDT SAT AUG 20 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ADJACENT COASTAL
WATERS...SOUTHEAST NORTH CAROLINA AND NORTHEAST SOUTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NCZ108-211415-
COASTAL NEW HANOVER-
1010 AM EDT SAT AUG 20 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST NORTH CAROLINA.

.DAY ONE...TODAY AND TONIGHT.

MODERATE RISK OF RIP CURRENTS THROUGH 800 PM TODAY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

8

In the hours before

Local storm report, Aug 20, 10:37 AM EDT, 2 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WILMINGTON NC
1037 AM EDT SAT AUG 20 2011

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

0900 PM     TSTM WND DMG     5 E KELLY               34.47N  78.23W
08/19/2011                   BLADEN             NC   NWS EMPLOYEE

            LARGE LIMB DOWN ON HWY 210 ONE MILE WEST OF HWY 11.

&&

EVENT NUMBER ILM1100509

43

Special weather statement, Aug 20, 1:25 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON NC
125 PM EDT SAT AUG 20 2011

SCZ039-201830-
WILLIAMSBURG-
125 PM EDT SAT AUG 20 2011

...A STRONG THUNDERSTORM WILL MOVE ACROSS WILLIAMSBURG COUNTY THROUGH
230 PM EDT...

AT 125 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR
TRIO...MOVING EAST AT 5 MPH.

SOME LOCATIONS IMPACTED INCLUDE EARLE...TRIO...AND HIGHWAY 521
BETWEEN ANDREWS AND SALTERS.

HAZARDS INCLUDE...
SMALL HAIL.
GUSTY WINDS OF 30 TO 40 MPH.
HEAVY RAINFALL AND MINOR FLOODING.

IF YOU SEE LIGHTNING OR HEAR THUNDER...YOU ARE AT RISK. TAKE SHELTER
INDOORS IMMEDIATELY. IF YOU CANNOT FIND SHELTER IN A BUILDING A
VEHICLE PROVIDES SAFETY FROM LIGHTNING.

&&

LAT...LON 3341 7976 3354 7977 3360 7961 3350 7956
      3346 7957 3345 7959 3343 7959 3340 7962
TIME...MOT...LOC 1725Z 263DEG 4KT 3351 7969

III

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 1:57 PM EDT	Special Weather Statement	ILM	Williamsburg	63 min
Aug 20, 3:05 PM EDT	Special Weather Statement	ILM	Florence	55 min
Aug 20, 3:33 PM EDT	Special Weather Statement	ILM	Dillon	57 min
Aug 20, 4:48 PM EDT	Special Weather Statement	ILM	Horry	42 min
Aug 19, 11:01 PM EDT	Special Weather Statement	ILM	Columbus, Robeson	59 min
Aug 19, 11:28 PM EDT	Severe Thunderstorm Warning	ILM	Bladen, Columbus, Robeson	42 min
Aug 19, 11:40 PM EDT	Areal Flood Advisory	ILM	Bladen, Columbus, Robeson	2 hr
Aug 20, 12:01 AM EDT	Special Weather Statement	ILM	Bladen, Columbus	59 min
Aug 20, 1:02 AM EDT	Special Weather Statement	ILM	Brunswick, Columbus	58 min
Aug 20, 1:41 AM EDT	Special Weather Statement	ILM	Robeson	94 min
Aug 20, 1:47 AM EDT	Areal Flood Warning	ILM	Robeson	3 hr
Aug 20, 3:14 AM EDT	Areal Flood Warning	ILM	Columbus	103 min
Aug 20, 4:04 PM EDT	Special Weather Statement	ILM	New Hanover	56 min
Aug 20, 4:35 PM EDT	Areal Flood Advisory	ILM	Brunswick, New Hanover	85 min
Aug 20, 4:40 PM EDT	Special Weather Statement	ILM	New Hanover	50 min
Aug 20, 5:26 PM EDT	Special Weather Statement	ILM	Brunswick	49 min
Aug 20, 5:48 PM EDT	Special Weather Statement	ILM	Columbus	57 min
Aug 20, 6:50 PM EDT	Areal Flood Advisory	ILM	Brunswick, Columbus	85 min
Aug 20, 6:53 PM EDT	Special Weather Statement	ILM	Columbus	67 min

Nearby

Special Weather Statements in South Carolina, 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.