Alert archive / South Carolina / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 53, NWS Columbia, SC

June 14, 2018Calhoun County, Clarendon County, Orangeburg County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Jun 14, 2018, 2:39 PM EDT for Calhoun County, Clarendon County, Orangeburg County, South Carolina. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 14, 2018, 2:39 PM EDT (18:39 UTC)
Expired
Jun 14, 2018, 3:21 PM EDT
In force
42 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Calhoun County, SC, Clarendon County, SC, Orangeburg County, SC

The radar

The Columbia radar (KCAE), 62 km from the middle of the area, began a volume at 18:41 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, 6.7 hours before the alert went out and 95 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-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2018-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 318 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 2018-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
318 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
917 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-23 m²/s²
0-3 km storm-relative helicity
-7 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 Jun 14, 2:29 PM EDT, 10 minutes earlier.

Area forecast discussion, Jun 14, 2:29 PM EDT, 10 minutes before
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Hazardous weather outlook, Jun 14, 4:54 AM EDT, 9 hours 45 minutes before
Hazardous Weather Outlook
National Weather Service Columbia SC
454 AM EDT Thu Jun 14 2018

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-150900-
Lincoln-McDuffie-Columbia-Richmond-Burke-Lancaster-Chesterfield-
McCormick-Newberry-Fairfield-Kershaw-Edgefield-Saluda-Lexington-
Richland-Lee-Aiken-Sumter-Barnwell-Orangeburg-Calhoun-Clarendon-
Bamberg-
454 AM EDT Thu Jun 14 2018

This Hazardous Weather Outlook is for the Midlands of South Carolina
and the Central Savannah River area of Georgia.

.DAY ONE...Today and Tonight.

Scattered thunderstorms will develop this afternoon and evening
across the Midlands and Central Savannah River Area. A few storms
could contain locally heavy rain and strong winds.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Thunderstorms will be possible each day mainly during the afternoon
and evening hours. A few storms could contain strong wind and
locally heavy rain.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Jun 14, 2:09 PM EDT, 30 minutes before
Special Weather Statement
National Weather Service Columbia SC
209 PM EDT THU JUN 14 2018

SCZ028-037-141830-
Calhoun SC-Richland SC-
209 PM EDT THU JUN 14 2018

...Strong Thunderstorms Will Impact Portions of northwestern Calhoun
and southeastern Richland Counties Until 230 PM EDT....

At 209 PM EDT...National Weather Service doppler radar indicated a
strong thunderstorm 10 miles east of Gaston, or 13 miles southeast of
Cayce, moving east at 15 mph.

  HAZARD...strong winds 45 to 55 mph and up to nickel sized hail.

  IMPACT...expect minor damage to tree limbs and blowing around of
           light, unsecured objects. Minor hail damage to plants,
           trees and crops is possible. Damage to windshields is
           unlikely.

Some locations in the path of this storm include...
St. Matthews.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify. Monitor NOAA Weather Radio, local radio and
television stations for additional information and possible warnings
from the National Weather Service.

&&

This includes Interstate 26 between mile markers 126 and 127, and
between mile markers 131 and 133.

LAT...LON 3363 8079 3373 8096 3376 8093 3378 8096
      3378 8101 3385 8098 3384 8072
TIME...MOT...LOC 1809Z 286DEG 15KT 3380 8093

JAQ
Special weather statement, Jun 14, 2:15 PM EDT, 24 minutes before
Special Weather Statement
National Weather Service Columbia SC
215 PM EDT THU JUN 14 2018

SCZ036-038-141830-
Orangeburg SC-Clarendon SC-
215 PM EDT THU JUN 14 2018

...Strong Thunderstorms Will Impact Portions of east central
Orangeburg and southwestern Clarendon Counties Until 230 PM EDT....

...Boaters on Lake Marion Should Seek Safe Harbor...

At 214 PM EDT...National Weather Service doppler radar indicated a
strong thunderstorm 7 miles south of Summerton, or 16 miles southwest
of Manning, moving southeast at 15 mph.

  HAZARD...strong winds 45 to 55 mph and up to nickel sized hail.

  IMPACT...expect minor damage to tree limbs and blowing around of
           light, unsecured objects. Minor hail damage to plants,
           trees and crops is possible. Damage to windshields is
           unlikely.

Some locations in the path of this storm include...
Summerton, Eutawville and Vance.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Boaters on Lake Marion should move to shore and seek shelter. Strong,
erratic wind gusts and lightning are possible. If you can hear
thunder, you are close enough to be struck by lightning.

This storm may intensify. Monitor NOAA Weather Radio, local radio and
television stations for additional information and possible warnings
from the National Weather Service.

&&

This includes Interstate 95 between mile markers 102 and 109.

LAT...LON 3348 8015 3347 8014 3345 8015 3346 8016
      3345 8017 3345 8020 3344 8020 3345 8022
      3340 8022 3339 8024 3330 8025 3329 8027
      3346 8048 3361 8036 3351 8011
TIME...MOT...LOC 1814Z 306DEG 14KT 3350 8036

JAQ

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 14, 2:09 PM EDTSpecial Weather StatementCAECalhoun21 min
Jun 14, 2:15 PM EDTSpecial Weather StatementCAEClarendon15 min
Jun 14, 6:24 PM EDTSpecial Weather StatementCAEKershaw, Lee36 min
Jun 14, 6:31 PM EDTSevere Thunderstorm WarningCAELee44 min
Jun 14, 6:44 PM EDTSpecial Weather StatementCAEBamberg16 min
Jun 14, 7:08 PM EDTSpecial Weather StatementCAELee37 min
Jun 14, 7:32 PM EDTAreal Flood AdvisoryCAEKershaw, Lee, Richland, Sumter58 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2018Every severe thunderstorm warning in 2018

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.