Alert archive / South Carolina / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 182, NWS Columbia, SC

August 18, 2016Clarendon County, Orangeburg County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Aug 18, 2016, 4:57 PM EDT for Clarendon County, Orangeburg County, South Carolina. It was in force for 51 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 18, 2016, 4:57 PM EDT (20:57 UTC)
Expired: Aug 18, 2016, 5:48 PM EDT
In force: 51 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clarendon County, SC, Orangeburg County, SC

The radar

The Columbia radar (KCAE), 101 km from the middle of the area, began a volume at 21:00 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.

What was reported inside it

Time	Report	Where	Remark
Aug 18, 5:20 PM EDT	TSTM WND DMG	1 N Eutawville, SC	PUBLIC REPORTED TREES DOWN ON MONCKS CORNER RD NEAR SC HWY 6. TIME ESTIMATED. .

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 23 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 9.0 hours before the alert went out and 65 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.

989 
WUUS52 KCAE 182057
SVRCAE
SCC027-075-182200-
/O.NEW.KCAE.SV.W.0182.160818T2057Z-160818T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
457 PM EDT THU AUG 18 2016

THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL ORANGEBURG COUNTY IN CENTRAL SOUTH CAROLINA...
  SOUTHWESTERN CLARENDON COUNTY IN CENTRAL SOUTH CAROLINA...

* UNTIL 600 PM EDT

* AT 457 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
  SUMMERTON...OR 15 MILES SOUTHWEST OF MANNING...MOVING SOUTHEAST AT
  20 MPH.

  HAZARD...60 MPH WIND GUSTS AND PENNY SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  SUMMERTON...SANTEE...LAKE MARION...EUTAWVILLE AND VANCE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

IF ON OR NEAR LAKE MARION...GET AWAY FROM THE WATER AND MOVE INDOORS
OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE OUT TO 15 MILES
FROM THE PARENT THUNDERSTORM. IF YOU CAN HEAR THUNDER...YOU ARE
CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE TO SAFE SHELTER NOW! DO
NOT BE CAUGHT ON THE WATER IN A THUNDERSTORM.

&&

LAT...LON 3350 8010 3350 8012 3348 8015 3346 8013
      3346 8015 3345 8015 3346 8016 3345 8017
      3345 8020 3344 8020 3345 8022 3340 8022
      3339 8024 3332 8025 3346 8051 3362 8043
      3354 8008
TIME...MOT...LOC 2057Z 292DEG 17KT 3352 8039 

HAIL...0.75IN
WIND...60MPH
 
$$

2 follow-up statements

232 
WWUS52 KCAE 182133
SVSCAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
533 PM EDT THU AUG 18 2016

SCC027-075-182200-
/O.CON.KCAE.SV.W.0182.000000T0000Z-160818T2200Z/
ORANGEBURG SC-CLARENDON SC-
533 PM EDT THU AUG 18 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR EAST CENTRAL ORANGEBURG AND SOUTH CENTRAL CLARENDON COUNTIES...

AT 532 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED 7 MILES SOUTHWEST
OF EASTERN LAKE MARION...OR 22 MILES SOUTH OF MANNING...MOVING
SOUTHEAST AT 10 MPH.

HAZARD...60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
EUTAWVILLE AND VANCE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3350 8010 3350 8012 3348 8015 3346 8013
      3346 8015 3345 8015 3346 8016 3345 8017
      3345 8020 3344 8020 3345 8022 3340 8022
      3339 8024 3332 8025 3344 8046 3359 8029
      3354 8008
TIME...MOT...LOC 2132Z 298DEG 9KT 3338 8029 

HAIL...0.75IN
WIND...60MPH
 
$$

CJR

607 
WWUS52 KCAE 182148
SVSCAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
548 PM EDT THU AUG 18 2016

SCC027-075-182157-
/O.CAN.KCAE.SV.W.0182.000000T0000Z-160818T2200Z/
ORANGEBURG SC-CLARENDON SC-
548 PM EDT THU AUG 18 2016

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL ORANGEBURG AND
SOUTH CENTRAL CLARENDON COUNTIES IS CANCELLED...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING HAS BEEN CANCELLED.  HOWEVER HEAVY RAIN IS
STILL POSSIBLE WITH THIS THUNDERSTORM AND LOCALIZED FLOODING IS
POSSIBLE.

LAT...LON 3350 8010 3350 8012 3348 8015 3346 8013
      3346 8015 3345 8015 3346 8016 3345 8017
      3345 8020 3344 8020 3345 8022 3340 8022
      3339 8024 3332 8025 3344 8046 3359 8029
      3354 8008
TIME...MOT...LOC 2143Z 292DEG 17KT 3335 8021 

$$

CJR

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 18, 2:42 PM EDT, 2 hours 15 minutes earlier.

Area forecast discussion, Aug 18, 2:42 PM EDT, 2 hours 15 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, 14 hours 24 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

Local storm report, Aug 18, 4:14 PM EDT, 43 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, 32 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

Local storm report, Aug 18, 4:30 PM EDT, 27 minutes before

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

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

0339 PM     TSTM WND DMG     3 WSW REMBERT           34.08N 80.58W
08/18/2016                   SUMTER             SC   DEPT OF HIGHWAYS

            TREES AND POWER LINE DOWN REPORTED AT STATE
            FARM RD REMBERT, SC.

&&

DA

Local storm report, Aug 18, 4:32 PM EDT, 25 minutes before

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

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

0342 PM     TSTM WND DMG     2 SSE REMBERT           34.07N 80.51W
08/18/2016                   SUMTER             SC   DEPT OF HIGHWAYS

            TREES REPORTED DOWN ON TB WRIGHT RD AT US
            521.

&&

DA

Special weather statement, Aug 18, 4:44 PM EDT, 13 minutes before

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

SCZ020-026-182115-
NEWBERRY-SALUDA-
444 PM EDT THU AUG 18 2016

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL SALUDA...SOUTHWESTERN
NEWBERRY AND NORTHEASTERN EDGEFIELD COUNTIES...

AT 444 PM EDT...A STRONG THUNDERSTORM WAS 8 MILES SOUTHEAST OF
GREENWOOD STATE PARK...OR 18 MILES SOUTHWEST OF NEWBERRY. THE STORM
WAS NEARLY STATIONARY.

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

LOCATIONS IMPACTED INCLUDE...
NEWBERRY...SALUDA...SILVERSTREET AND CHAPPELLS.

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

LAT...LON 3404 8195 3409 8192 3413 8187 3415 8190
      3418 8190 3418 8192 3419 8192 3420 8194
      3425 8191 3429 8190 3428 8162 3391 8167
      3400 8198
TIME...MOT...LOC 2044Z 268DEG 3KT 3411 8185

CJR

Special weather statement, Aug 18, 4:54 PM EDT, 3 minutes before

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

SCZ036-038-182130-
CLARENDON-ORANGEBURG-
454 PM EDT THU AUG 18 2016

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

AT 454 PM EDT...A STRONG THUNDERSTORM WAS NEAR SANTEE...MOVING
SOUTHEAST AT 20 MPH.

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

IF YOU ARE ON OR NEAR LAKE MARION...GET OUT OF THE WATER AND MOVE
INDOORS OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE OUT TO
15 MILES FROM THE PARENT THUNDERSTORM.  DO NOT BE CAUGHT ON THE
WATER IN A THUNDERSTORM.

LAT...LON 3350 8011 3350 8012 3348 8015 3346 8013
      3346 8015 3345 8015 3346 8016 3345 8017
      3345 8020 3344 8020 3345 8022 3340 8022
      3339 8024 3331 8025 3345 8053 3362 8045
      3354 8009
TIME...MOT...LOC 2054Z 292DEG 17KT 3351 8042

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, 4:25 PM EDT	Special Weather Statement	CAE	Clarendon	35 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, 5:34 PM EDT	Special Weather Statement	CAE	Bamberg	26 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2016 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.