Alert archive / Georgia / Special Weather Statements in 2015

Special Weather Statement, NWS Columbia, SC

September 10, 2015Columbia County, McDuffie County, Richmond County, Georgia

NWS Columbia, SC issued this special weather statement at Sep 10, 2015, 4:03 PM EDT for Columbia County, McDuffie County, Richmond County, Georgia. 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 10, 2015, 4:03 PM EDT (20:03 UTC)
Expired: Sep 10, 2015, 5:00 PM EDT
In force: 57 min
Issued by: NWS Columbia, SC

Counties Columbia County, GA, McDuffie County, GA, Richmond County, GA

The radar

The Robins AFB radar (KJGX), 124 km from the middle of the area, began a volume at 20:03 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, 8.1 hours before the alert went out and 237 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: 1090 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 972 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.8

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 10, 2:16 PM EDT, 1 hour 47 minutes earlier.

Area forecast discussion, Sep 10, 2:16 PM EDT, 1 hour 47 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE COLUMBIA SC
216 PM EDT THU SEP 10 2015

.SYNOPSIS...
A TROUGH OF LOW PRESSURE WILL LINGER ACROSS THE AREA THROUGH
FRIDAY. AN APPROACHING COLD FRONT WILL MOVE THROUGH THE AREA
SATURDAY NIGHT. HIGH PRESSURE WILL DOMINATE EARLY NEXT WEEK
BRINGING A DRY AND COOL AIRMASS.

&&

.NEAR TERM /THROUGH TONIGHT/...
UPDATE: HAVE INCREASED POPS FOR LATE AFTERNOON INTO EARLY THIS
EVENING BASED ON SHORT WAVE ENERGY PROGGED TO CROSS GA INTO
SOUTHERN AND CENTRAL SC AFTER 20Z. AIRMASS BECOMING MODERATELY
UNSTABLE ACROSS MUCH OF THE MIDLANDS AND CSRA. COULD SEE A FEW
STRONG STORMS GIVEN STEEP LAPSE RATES AND DOWNDRAFT CAPES.

PREVIOUS DISCUSSION:
CONVERGENCE INTO THE SURFACE TROUGH AND UPPER- LEVEL LIFT AHEAD
OF THE UPPER TROUGH SUPPORTS SHOWERS AND THUNDERSTORMS TODAY AND
TONIGHT. THE GREATEST COVERAGE SHOULD BE LATE THIS AFTERNOON INTO
THE EVENING AIDED BY A MID-LEVEL SHORTWAVE TROUGH AND HEATING. THE
HRRR DISPLAYED INCREASED COVERAGE MOVING INTO WEST PART OF THE
FORECAST AREA TOWARD 400 PM. THE NAM INDICATED SURFACE-BASED LI/S
-4 TO -5 WITH PRECIPITABLE WATER AROUND 2 INCHES. MODERATE
INSTABILITY COULD LEAD TO A FEW THUNDERSTORMS WITH STRONG WINDS.
THE HIGH MOISTURE INDICATES SOME OF THE THUNDERSTORMS WILL HAVE
HEAVY DOWNPOURS. AFTERNOON HIGHS WILL WARM TO THE UPPER AND LOWER
90S. EXPECT OVERNIGHT LOWS IN THE UPPER 60S TO LOWER 70S.

&&

.SHORT TERM /FRIDAY THROUGH FRIDAY NIGHT/...
MODELS HAVE TRENDED DRIER FOR FRIDAY AND FRIDAY NIGHT. MID-LEVEL
DRYING BEHIND A SHORTWAVE MAY LIMIT CONVECTIVE COVERAGE. WITH ONLY
SHALLOW MOISTURE PRESENT...PWAT VALUES WILL RANGE FROM 1.50 TO
1.75. HOWEVER CONVERGENCE INTO A SURFACE TROUGH MAY BE SUFFICIENT
TO TRIGGER STORMS FRIDAY AFTERNOON. REDUCED POPS BUT KEPT FORECAST
CONSISTENT BY USING THE HIGHER GUIDANCE POPS.

&&

.LONG TERM /SATURDAY THROUGH THURSDAY/...
SATURDAY...THERE IS A CHANCE FOR SHOWERS AND THUNDERSTORMS AHEAD
OF THE APPROACHING COLD FRONT SATURDAY. CONVECTION MAY CONTINUE
THROUGH THE EVENING DEPENDING ON THE TIMING OF THE FRONTAL
PASSAGE.

SUNDAY THROUGH THURSDAY...HIGH PRESSURE BEHIND THE FRONT WILL
BRING A COOLER AND DRIER AIRMASS INTO THE FORECAST AREA THROUGH
MIDWEEK. MODEL GUIDANCE SUGGESTS TEMPERATURES NEAR OR BELOW
NORMAL.

&&

.AVIATION /18Z THURSDAY THROUGH TUESDAY/...
DEEP WEST TO SOUTHWEST FLOW ACROSS THE REGION WITH SURFACE TROUGH
ACROSS THE CENTRAL CAROLINAS INTO GA. MOIST AND UNSTABLE
ATMOSPHERE COUPLED WITH WEAK UPPER LEVEL DISTURBANCE SHOULD
TRIGGER AFTERNOON AND EVENING CONVECTION. WILL INCLUDE TEMPO TSRA
IN ALL TAF 21Z-01Z. CONVECTION EXPECTED TO DIMINISH THIS EVENING
AS THE DISTURBANCE MOVES EAST AND LOSS OF HEATING. COULD SEE MVFR
OR LOWER CONDITIONS DEVELOP DURING THE EARLY MORNING FRIDAY...
ESPECIALLY AT AGS/DNL/OGB. VFR TO RETURN TO ALL TAF SITES BY MID-
MORNING.

.EXTENDED AVIATION OUTLOOK...
MAINLY DIURNAL CONVECTION EXPECTED THROUGH SATURDAY NIGHT. A COLD
FRONT WILL CROSS THE AREA SATURDAY NIGHT WITH DRIER AIR FILTERING
IN ON SUNDAY.

&&

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

&&

99

Hazardous weather outlook, Sep 10, 3:52 AM EDT, 12 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE COLUMBIA SC
352 AM EDT THU SEP 10 2015

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-110800-
LINCOLN-MCDUFFIE-COLUMBIA-RICHMOND-BURKE-LANCASTER-CHESTERFIELD-
MCCORMICK-NEWBERRY-FAIRFIELD-KERSHAW-EDGEFIELD-SALUDA-LEXINGTON-
RICHLAND-LEE-AIKEN-SUMTER-BARNWELL-ORANGEBURG-CALHOUN-CLARENDON-
BAMBERG-
352 AM EDT THU SEP 10 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE MIDLANDS OF SOUTH CAROLINA
AND THE CENTRAL SAVANNAH RIVER AREA OF GEORGIA.

.DAY ONE...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

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

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 10, 4:03 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
403 PM EDT THU SEP 10 2015

GAZ040-063>065-077-SCZ018-025-030-102100-
MCDUFFIE-LINCOLN-BURKE-RICHMOND-COLUMBIA-MCCORMICK-EDGEFIELD-AIKEN-
403 PM EDT THU SEP 10 2015

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT MCDUFFIE...COLUMBIA...
NORTHWESTERN BURKE...SOUTHEASTERN LINCOLN...RICHMOND...SOUTHWESTERN
EDGEFIELD...SOUTHEASTERN MCCORMICK AND SOUTHWESTERN AIKEN COUNTIES...

AT 359 PM EDT...AN AREA OF STRONG THUNDERSTORMS WILL BE MOVING EAST
NORTHEAST INTO THE CSRA OVER THE NEXT HOUR. THE STRONGEST STORM WAS
NEAR THOMSON... MOVING EAST AT 30 MPH.

WIND GUSTS OF 35 TO 45 MPH ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
NORTH AUGUSTA...GROVETOWN...EVANS...THOMSON...AUGUSTA...FORT
GORDON...MARTINEZ...BELVEDERE...HEPHZIBAH...HARLEM...BLYTHE...
DEARING...KEYSVILLE...MODOC AND CLARKS HILL.

LAT...LON 3361 8264 3361 8263 3364 8261 3363 8258
      3365 8258 3364 8256 3366 8251 3365 8249
      3368 8250 3374 8203 3323 8182 3309 8228
      3323 8223 3331 8234 3331 8239 3334 8244
      3336 8255 3341 8255 3346 8259
TIME...MOT...LOC 1959Z 271DEG 25KT 3353 8244

CJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 10, 5:23 PM EDT	Special Weather Statement	CAE	Richland	37 min
Sep 10, 5:25 PM EDT	Special Weather Statement	CAE	Barnwell	35 min
Sep 10, 5:26 PM EDT	Special Weather Statement	CAE	Lancaster	34 min
Sep 10, 5:38 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Barnwell	22 min
Sep 10, 7:14 PM EDT	Severe Thunderstorm Warning	CAE	Clarendon, Sumter	46 min

Nearby

Special Weather Statements in Georgia, 2015 Every special weather statement in 2015

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.