Alert archive / South Carolina / Special Weather Statements in 2016

Special Weather Statement, NWS Columbia, SC

August 18, 2016Clarendon County, South Carolina

NWS Columbia, SC issued this special weather statement at Aug 18, 2016, 4:25 PM EDT for Clarendon County, South Carolina. It was in force for 35 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 18, 2016, 4:25 PM EDT (20:25 UTC)
Expired: Aug 18, 2016, 5:00 PM EDT
In force: 35 min
Issued by: NWS Columbia, SC

County Clarendon County, SC

The radar

The Columbia radar (KCAE), 94 km from the middle of the area, began a volume at 20:28 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, 8.4 hours before the alert went out and 89 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: 1318 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 863 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 Aug 18, 2:42 PM EDT, 1 hour 43 minutes earlier.

Area forecast discussion, Aug 18, 2:42 PM EDT, 1 hour 43 minutes before

Area Forecast Discussion
National Weather Service Columbia SC
242 PM EDT THU AUG 18 2016

.SYNOPSIS...
A pressure ridge will extend from the Atlantic westward into the
Gulf of Mexico through the weekend. North of the ridge, a pressure
trough and associated moisture will be in the forecast area. The
pattern indicates continued above normal temperatures because of
the ridging and thunderstorms associated with the trough.

&&

.NEAR TERM /THROUGH TONIGHT/...
Weak upper ridging will continue over the region through tonight
with a lee-side trough at the surface. Convergence into the
trough combined with strong heating will continue to promote
scattered to numerous showers and thunderstorms this afternoon
and evening. Moisture is abundant with precipitable water values
generally around 2.0 to 2.1 inches. Mesoscale analysis this
afternoon shows moderate instability across the forecast area with
LI values around -6 to -7. Slow storm movement and relatively high
precipitable water supports a threat of locally heavy rainfall.
The instability indicates a possibility of damaging wind with a
few of the thunderstorms. DCAPE values are slightly lower than
yesterday at around 900 J/kg. Temperatures are on track this
afternoon with above normal highs still expected in the middle
90s. Overnight lows generally in the lower 70s.

&&

.SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/...
A surface trough and weakening upper ridge supports chance to high
chance of mainly diurnal thunderstorms on Friday and Saturday.
Atmospheric moisture across the area will remain high,
particularly on Saturday with models suggesting values above 2
inches. Such large values support heavy rainfall in thunderstorms
and may produce localized flooding.

Models indicate a series of embedded upper level disturbances
moving over the ridge from early Saturday morning through the
evening, supporting convective activity. However 500 mb
temperatures -6 degrees C or warmer will help to limit severe
potential. Temperatures will remain above normal during the
period.

&&

.LONG TERM /SUNDAY THROUGH THURSDAY/...
An upper level trough will move through the Great Lakes region
late this weekend. The associated cold front will move into the
Southeast early next week and stall as mid and upper flow becomes
parallel to the front. Recent model runs have been inconsistent
with how far south the front will push. At this time, it is not
clear whether the front will push through the forecast area or
stall somewhere over it. There will be above normal temperatures
and a chance for thunderstorms Sunday and Monday ahead of and
during the possible frontal passage. Temperatures during the
remainder of the period will be cooler with the front over or
south of the area.

&&

.AVIATION /18Z THURSDAY THROUGH TUESDAY/...
VFR conditions expected for a majority of the TAF period outside
of diurnal convection and possible early morning stratus.

Bermuda high pressure will gradually weaken over the region through
the period while moisture and instability increase. Scattered
diurnal convection will continue through this evening. Restrictions
may be possible in heavy rain with storms that move over the
terminals. Strong winds will also be possible. Have indicated VCTS
in all TAFs through 19/03Z, but may amend as confidence in
coverage and timing increase. Convection expected to diminish
tonight as instability decreases with the loss of daytime heating.
Bufkit model soundings show abundant low level moisture early
Friday. Model guidance is indicating potential for fog/stratus,
but believe stratus is the more likely scenario given a 25 kt low
level jet and expected debris clouds. Winds will generally be out
of the southwest through the period at around 7 knots or less.

EXTENDED AVIATION OUTLOOK...Scattered to numerous diurnal
thunderstorms each day. Some late night/early morning fog/stratus
possible.

&&

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

&&

SYNOPSIS...99
NEAR TERM...99
SHORT TERM...99
LONG TERM...99
AVIATION...99

Hazardous weather outlook, Aug 18, 2:33 AM EDT, 13 hours 52 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE COLUMBIA SC
233 AM EDT THU AUG 18 2016

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-190715-
LINCOLN-MCDUFFIE-COLUMBIA-RICHMOND-BURKE-LANCASTER-CHESTERFIELD-
MCCORMICK-NEWBERRY-FAIRFIELD-KERSHAW-EDGEFIELD-SALUDA-LEXINGTON-
RICHLAND-LEE-AIKEN-SUMTER-BARNWELL-ORANGEBURG-CALHOUN-CLARENDON-
BAMBERG-
233 AM EDT THU AUG 18 2016

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

.DAY ONE...TODAY AND TONIGHT.

A FEW THUNDERSTORMS THIS AFTERNOON AND EVENING COULD POSSIBLY
CONTAIN DAMAGING WIND. HEAVY RAIN WITH LOCALIZED FLOODING IS ALSO
POSSIBLE.

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

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Aug 18, 3:05 PM EDT, 1 hour 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
305 PM EDT THU AUG 18 2016

GAZ063>065-077-182000-
MCDUFFIE-BURKE-RICHMOND-COLUMBIA-
305 PM EDT THU AUG 18 2016

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN MCDUFFIE...SOUTH
CENTRAL COLUMBIA...NORTHWESTERN BURKE AND SOUTHWESTERN RICHMOND
COUNTIES...

AT 305 PM EDT...A STRONG THUNDERSTORM WAS NEAR HEPHZIBAH...OR 11
MILES SOUTH OF FORT GORDON. THE STORM WAS NEARLY STATIONARY.

WIND GUSTS OF 45 TO 55 MPH ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
HEPHZIBAH...HARLEM...BLYTHE AND KEYSVILLE.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

LAT...LON 3343 8231 3335 8199 3304 8208 3310 8228
      3315 8227 3323 8223 3326 8225 3327 8229
      3330 8231 3331 8234 3331 8237
TIME...MOT...LOC 1905Z 301DEG 4KT 3326 8219

CJR

Special weather statement, Aug 18, 3:20 PM EDT, 1 hour 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
320 PM EDT THU AUG 18 2016

SCZ022-028-029-031-182015-
LEE-RICHLAND-SUMTER-KERSHAW-
320 PM EDT THU AUG 18 2016

...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL KERSHAW...EAST
CENTRAL RICHLAND...SOUTHWESTERN LEE AND NORTHWESTERN SUMTER
COUNTIES...

AT 320 PM EDT...A STRONG THUNDERSTORM WAS 10 MILES SOUTHWEST OF
BISHOPVILLE. THE STORM WAS NEARLY STATIONARY.

WIND GUSTS OF 45 TO 55 MPH ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
SUMTER...BISHOPVILLE...EASTOVER...OAKLAND...OSWEGO...STATEBURG...
CHERRYVALE...REMBERT AND DALZELL.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

LAT...LON 3387 8075 3412 8080 3425 8026 3401 8023
TIME...MOT...LOC 1920Z 267DEG 3KT 3412 8038

CJR

Special weather statement, Aug 18, 3:31 PM EDT, 54 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
331 PM EDT THU AUG 18 2016

GAZ077-182000-
BURKE-
331 PM EDT THU AUG 18 2016

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHWESTERN BURKE
COUNTY...

AT 331 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS ALONG A LINE
EXTENDING FROM 8 MILES NORTHEAST OF LOUISVILLE TO SUMMERTOWN...AND
MOVING NORTHEAST AT 10 MPH.

WIND GUSTS OF 45 TO 55 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THESE
STORMS.

LOCATIONS IMPACTED INCLUDE...
MIDVILLE AND VIDETTE.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
CAUSE LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

LAT...LON 3282 8226 3283 8231 3284 8231 3293 8227
      3303 8229 3309 8228 3314 8208 3292 8207
      3288 8213 3281 8215 3280 8221
TIME...MOT...LOC 1931Z 236DEG 7KT 3305 8227 3274 8227

Special weather statement, Aug 18, 3:46 PM EDT, 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
346 PM EDT THU AUG 18 2016

GAZ077-182015-
BURKE-
346 PM EDT THU AUG 18 2016

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN BURKE COUNTY...

AT 345 PM EDT...A STRONG THUNDERSTORM WAS OVER SARDIS...OR 16 MILES
NORTH OF SYLVANIA...MOVING EAST AT 15 MPH.

WIND GUSTS OF 45 TO 55 MPH ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
SARDIS AND GIRARD.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

LAT...LON 3295 8182 3294 8183 3295 8186 3294 8193
      3312 8181 3308 8160 3305 8157 3306 8156
      3304 8156 3291 8176
TIME...MOT...LOC 1945Z 283DEG 14KT 3298 8171

CJR

Local storm report, Aug 18, 4:14 PM EDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
414 PM EDT THU AUG 18 2016

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

0332 PM     TSTM WND DMG     1 NW MARTINEZ           33.53N 82.10W
08/18/2016                   COLUMBIA           GA   LAW ENFORCEMENT

            TREES DOWN AND TRAFFIC LIGHTS DOWN NEAR THE
            PASS AND CLARKE POINTE NEAR EVANS.

&&

DCM

Special weather statement, Aug 18, 4:25 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
425 PM EDT THU AUG 18 2016

SCZ031-036-038-182100-
CLARENDON-SUMTER-ORANGEBURG-
425 PM EDT THU AUG 18 2016

...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL ORANGEBURG...
CLARENDON AND SOUTHERN SUMTER COUNTIES...

AT 424 PM EDT...A STRONG THUNDERSTORM WAS OVER MANNING...MOVING
NORTHEAST AT 10 MPH.

WIND GUSTS OF 45 TO 55 MPH AND PEA SIZED HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
MANNING...SUMMERTON AND PAXVILLE.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

LAT...LON 3370 8000 3365 8002 3349 8045 3370 8053
      3386 8005 3371 7998
TIME...MOT...LOC 2024Z 228DEG 9KT 3370 8018

CJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 1:34 PM EDT	Special Weather Statement	CAE	Kershaw	56 min
Aug 18, 2:09 PM EDT	Special Weather Statement	CAE	Lexington	66 min
Aug 18, 2:36 PM EDT	Special Weather Statement	CAE	Kershaw	54 min
Aug 18, 2:54 PM EDT	Special Weather Statement	CAE	Aiken	66 min
Aug 18, 2:59 PM EDT	Special Weather Statement	CAE	Calhoun	46 min
Aug 18, 3:01 PM EDT	Areal Flood Advisory	CAE	Fairfield, Kershaw, Lancaster, Lee, Richland, Sumter	59 min
Aug 18, 3:15 PM EDT	Areal Flood Advisory	CAE	Chesterfield	2 hr
Aug 18, 3:20 PM EDT	Special Weather Statement	CAE	Lee	55 min
Aug 18, 3:35 PM EDT	Severe Thunderstorm Warning	CAE	Lee, Sumter	40 min
Aug 18, 4:09 PM EDT	Areal Flood Advisory	CAE	Kershaw, Lee, Richland, Sumter	111 min
Aug 18, 4:39 PM EDT	Severe Thunderstorm Warning	CAE	Bamberg, Orangeburg	36 min
Aug 18, 4:44 PM EDT	Special Weather Statement	CAE	Saluda	31 min
Aug 18, 4:54 PM EDT	Special Weather Statement	CAE	Clarendon	36 min
Aug 18, 4:57 PM EDT	Severe Thunderstorm Warning	CAE	Clarendon, Orangeburg	51 min
Aug 18, 5:34 PM EDT	Special Weather Statement	CAE	Bamberg	26 min
Aug 18, 2:50 PM EDT	Special Weather Statement	CAE	Burke	55 min
Aug 18, 3:05 PM EDT	Special Weather Statement	CAE	Richmond	55 min
Aug 18, 3:31 PM EDT	Special Weather Statement	CAE	Burke	29 min
Aug 18, 3:31 PM EDT	Severe Thunderstorm Warning	CAE	Columbia, McDuffie, Richmond	44 min
Aug 18, 3:46 PM EDT	Special Weather Statement	CAE	Burke	29 min

Nearby

Special Weather Statements in South Carolina, 2016 Every special weather statement in 2016

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.