Alert archive / South Carolina / Special Weather Statements in 2012

Special Weather Statement, NWS Columbia, SC

September 8, 2012Edgefield County, South Carolina

NWS Columbia, SC issued this special weather statement at Sep 8, 2012, 4:48 PM EDT for Edgefield County, South Carolina. It was in force for 57 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: Sep 8, 2012, 4:48 PM EDT (20:48 UTC)
Expired: Sep 8, 2012, 5:45 PM EDT
In force: 57 min
Issued by: NWS Columbia, SC

County Edgefield County, SC

The radar

The Columbia radar (KCAE), 93 km from the middle of the area, began a volume at 20:49 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, 8.8 hours before the alert went out and 210 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: 1887 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 655 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: -28 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 Columbia, SC wrote its last area forecast discussion before this special weather statement went out at Sep 8, 2:06 PM EDT, 2 hours 42 minutes earlier.

Area forecast discussion, Sep 8, 2:06 PM EDT, 2 hours 42 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE COLUMBIA SC
206 PM EDT SAT SEP 8 2012

.SYNOPSIS...
AN APPROACHING COLD FRONT WILL MOVE THROUGH THE FORECAST AREA
TONIGHT. COOLER AND DRIER AIR BEHIND THE FRONT WILL DOMINATE
SUNDAY THROUGH MUCH OF THE REST OF THE WEEK.

&&

.NEAR TERM /THROUGH TONIGHT/...
THE COLD FRONT WAS IN THE APPALACHIANS EARLY THIS AFTERNOON.
SHOWERS AND THUNDERSTORMS WERE OCCURRING NEAR THE FRONT. AHEAD OF
THE FRONT A MID-LEVEL SHORTWAVE TROUGH AND PRE-FRONTAL TROUGH WERE
HELPING TO SUPPORT SCATTERED SHOWERS AND THUNDERSTORMS. RADAR
TRENDS SUPPORT SCATTERED COVERAGE THROUGH THE MIDDLE OF THE
AFTERNOON WITH THE MAIN BAND OF SHOWERS AND THUNDERSTORMS REACHING
THE AREA BETWEEN 600 PM AND 900 PM. THE LATEST ANALYSIS SHOWED
SURFACE-BASED LI/S NEAR -6. DOWNDRAFT CAPE WAS AROUND 1000 J/KG. SHEAR
WAS MARGINAL WITH H85 WINDS NEAR 20 KNOTS. CONTINUED AFTERNOON
HEATING MAY LEAD TO INSTABILITY BECOMING A LITTLE STRONGER. A FEW
THUNDERSTORMS THIS AFTERNOON AND EVENING MAY CONTAIN DAMAGING
WIND.

CONVERGENCE ALONG THE FRONT AND LIFT ASSOCIATED WITH THE RIGHT
ENTRANCE REGION OF THE H25 JET WILL SUPPORT A CONTINUED SHOWER AND
THUNDERSTORM CHANCE OVERNIGHT...BUT THE CHANCE SHOULD DIMINISH
FROM WEST TO EAST BECAUSE OF PREVIOUS CONVECTION AND DRYING BEHIND
THE FRONT.

&&

.SHORT TERM /SUNDAY THROUGH MONDAY/...
DRYING BEHIND THE COLD FRONT WILL OCCUR SUNDAY. THE DRY AIR MASS
WILL CONTINUE THROUGH MONDAY. THE TEMPERATURE GUIDANCE WAS
CONSISTENT.

&&

.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
THE GFS AND ECMWF SHOW DRY HIGH PRESSURE DOMINATING DURING THE
EXTENDED PERIOD. USED THE GFS ENSEMBLE MEANS FOR THE TEMPERATURE
FORECAST.

&&

.AVIATION /18Z SATURDAY THROUGH THURSDAY/...
AHEAD OF THE MAIN UPPER TROUGH AND COLD FRONT...A WEAK UPPER IMPULSE
IS CURRENTLY ROLLING ACROSS THE REGION...WHERE CONVECTION IS
CURRENTLY DEVELOPING ALONG A PREFRONTAL TROUGH. OTHERWISE...MAIN
FRONT TO ROLL THROUGH TONIGHT. WILL EXPECT SHOWER AND THUNDERSTORM
ACTIVITY ALONG AND AHEAD OF IT. MAIN CONCERN FOR THIS TAF PERIOD
WILL BE TSRA ACTIVITY. CURRENTLY THINKING IS THAT THE BEST CHANCE
FOR TS AFFECTING THE TERMINALS WILL BE LATE AFTERNOON AND EVENING.
WILL MAINTAIN PREDOMINATE TSRA/CB MENTION DURING THAT TIME PERIOD.
WILL CONCENTRATE ON THE NEAR TERM AND AMEND IF/WHEN CONFIDENCE
WARRANTS.

EXTENDED AVIATION OUTLOOK...NO IMPACTS TO AVIATION EXPECTED.

&&

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

Hazardous weather outlook, Sep 8, 5:34 AM EDT, 11 hours 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE COLUMBIA SC
534 AM EDT SAT SEP 8 2012

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-090945-
LINCOLN-MCDUFFIE-COLUMBIA-RICHMOND-BURKE-LANCASTER-CHESTERFIELD-
MCCORMICK-NEWBERRY-FAIRFIELD-KERSHAW-EDGEFIELD-SALUDA-LEXINGTON-
RICHLAND-LEE-AIKEN-SUMTER-BARNWELL-ORANGEBURG-CALHOUN-CLARENDON-
BAMBERG-
534 AM EDT SAT SEP 8 2012

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

.DAY ONE...TODAY AND TONIGHT.

A STRONG COLD FRONT WILL CROSS THE AREA LATE TODAY INTO TONIGHT.
THIS WILL BRING THUNDERSTORMS TO THE AREA WITH A SLIGHT CHANCE OF
SEVERE THUNDERSTORMS. THE MAIN SEVERE THREATS ASSOCIATED WITH THE
THUNDERSTORMS WILL BE DAMAGING WIND GUSTS AND LARGE HAIL.

.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.

In the hours before

Special weather statement, Sep 8, 3:31 PM EDT, 1 hour 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
331 PM EDT SAT SEP 8 2012

SCZ015-016-082015-
CHESTERFIELD-LANCASTER-
331 PM EDT SAT SEP 8 2012

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF CHESTERFIELD AND
LANCASTER COUNTIES THROUGH 415 PM EDT...

AT 330 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM IN SOUTHEAST LANCASTER COUNTY MOVING TOWARD
THE JEFFERSON AREA OF WESTERN CHESTERFIELD COUNTY. THE STORM
WAS MOVING EASTWARD NEAR 15 MPH.

THE THUNDERSTORM WILL LIKELY CONTAIN DANGEROUS LIGHTNING...
WIND GUSTS NEAR 45 MPH...AND BRIEF HEAVY DOWNPOURS. SMALL HAIL
MAY ALSO OCCUR.

&&

LAT...LON 3462 8023 3461 8040 3461 8042 3456 8055
      3469 8060 3478 8036
TIME...MOT...LOC 1930Z 253DEG 13KT 3462 8048

Special weather statement, Sep 8, 3:31 PM EDT, 1 hour 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
331 PM EDT SAT SEP 8 2012

SCZ020-025>027-082030-
EDGEFIELD-LEXINGTON-NEWBERRY-SALUDA-
331 PM EDT SAT SEP 8 2012

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF EDGEFIELD...
LEXINGTON...NEWBERRY AND SALUDA COUNTIES THROUGH 430 PM EDT...

AT 328 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM...12 MILES WEST OF SALUDA...MOVING EAST AT 25
MPH.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
BATESBURG...LEESVILLE...PROSPERITY AND SALUDA...

PREPARE NOW FOR THE FOLLOWING HAZARDS...
GUSTY WINDS OF 40 TO 50 MPH...
PEA SIZE 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 3398 8200 3413 8188 3430 8135 3423 8132
      3420 8135 3418 8131 3391 8127 3381 8203
      3395 8205
TIME...MOT...LOC 1931Z 259DEG 25KT 3396 8194

Special weather statement, Sep 8, 4:48 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
448 PM EDT SAT SEP 8 2012

SCZ018-025-082145-
EDGEFIELD-MCCORMICK-
448 PM EDT SAT SEP 8 2012

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF EDGEFIELD AND
MCCORMICK COUNTIES THROUGH 545 PM EDT...

AT 445 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER THE SOUTHERN PART OF LAKE THURMOND.
MOVEMENT WAS EASTWARD AT 30 MPH AND IT WILL AFFECT SOUTHERN AND
CENTRAL EDGEFIELD COUNTY.

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

&&

LAT...LON 3386 8183 3366 8187 3360 8193 3355 8199
      3359 8210 3360 8210 3359 8212 3362 8218
      3363 8220 3366 8220 3371 8224 3373 8223
TIME...MOT...LOC 2046Z 267DEG 30KT 3367 8215

The office that day

Everything else NWS Columbia, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 8, 3:31 PM EDT	Special Weather Statement	CAE	Chesterfield	44 min
Sep 8, 4:32 PM EDT	Severe Thunderstorm Warning	CAE	Lexington, Richland	58 min
Sep 8, 5:08 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Edgefield	37 min
Sep 8, 6:15 PM EDT	Special Weather Statement	CAE	Lee, Sumter	60 min
Sep 8, 7:03 PM EDT	Special Weather Statement	CAE	Burke, Richmond	57 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.