Alert archive / South Carolina / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 120, NWS Columbia, SC

June 27, 20204 counties in South Carolina; Burke County, Richmond County, Georgia

NWS Columbia, SC issued this severe thunderstorm warning at Jun 27, 2020, 7:42 PM EDT for 4 counties in South Carolina; Burke County, Richmond County, Georgia. It was in force for 63 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 27, 2020, 7:42 PM EDT (23:42 UTC)
Expired: Jun 27, 2020, 8:45 PM EDT
In force: 63 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Burke County, GA, Richmond County, GA, Aiken County, SC, Bamberg County, SC, Barnwell County, SC, Orangeburg County, SC

The radar

The Columbia radar (KCAE), 79 km from the middle of the area, began a volume at 23:43 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, 11.7 hours before the alert went out and 147 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1464 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -114 m²/s²
0-3 km storm-relative helicity: -113 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 27, 7:36 PM EDT, 6 minutes earlier.

Area forecast discussion, Jun 27, 7:36 PM EDT, 6 minutes before

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Hazardous weather outlook, Jun 27, 4:47 AM EDT, 14 hours 55 minutes before

Hazardous Weather Outlook
National Weather Service Columbia SC
447 AM EDT Sat Jun 27 2020

GAZ040-063>065-077-SCZ016-018-020>022-025>031-035>038-041-115-116-
280900-
Lincoln-McDuffie-Columbia-Richmond-Burke-Chesterfield-McCormick-
Newberry-Fairfield-Kershaw-Edgefield-Saluda-Lexington-Richland-Lee-
Aiken-Sumter-Barnwell-Orangeburg-Calhoun-Clarendon-Bamberg-
Northern Lancaster-Southern Lancaster-
447 AM EDT Sat Jun 27 2020

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...Sunday through Friday.

The probability for widespread hazardous weather is low. Scattered
thunderstorms may produce isolated damaging winds on Sunday
afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Jun 27, 6:14 PM EDT, 1 hour 28 minutes before

Special Weather Statement
National Weather Service Columbia SC
614 PM EDT Sat Jun 27 2020

GAZ040-063-064-SCZ018-025-272315-
McDuffie GA-Lincoln GA-Columbia GA-McCormick SC-Edgefield SC-
614 PM EDT Sat Jun 27 2020

...Strong Thunderstorms Will Impact Portions of McDuffie...Lincoln...
Columbia...McCormick and western Edgefield Counties Until 715 PM
EDT....

...Boaters on Lake Strom Thurmond Should Seek Safe Harbor...

At 613 PM EDT...National Weather Service doppler radar indicated
strong thunderstorms along a line extending from near Middleton to 7
miles northwest of Sharon, moving east at 40 mph.

  HAZARD...gusty winds 40 to 50 mph.

  IMPACT...expect minor damage to tree limbs and blowing around of
           light, unsecured objects.

Some locations in the path of these storms include...
Grovetown, Evans, Thomson, Martinez, McCormick, Harlem, Lincolnton,
Clarks Hill Recreation Area, Elijah Clark State Park, Mistletoe State
Park, Wrightsboro, Village Plaza Shopping Center, J. Strom Thurmond
Dam, Thomson-McDuffie County Airport, Appling, Riverwood, Hamilton
Branch State Park, Mccormick County Airport, Lake Strom Thurmond and
Bobby Brown State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Boaters on Lake Strom Thurmond 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.

Persons in campgrounds should seek shelter until these storms pass.

&&

This includes Interstate 20 in Georgia between mile markers 166 and
196.

LAT...LON 3365 8258 3366 8251 3365 8249 3382 8259
      3386 8257 3386 8261 3398 8265 3396 8257
      3402 8259 3408 8248 3406 8245 3406 8233
      3397 8230 3402 8224 3397 8218 3397 8195
      3354 8202 3331 8235 3335 8255 3360 8265
TIME...MOT...LOC 2213Z 290DEG 36KT 3407 8275 3366 8285

Special weather statement, Jun 27, 7:12 PM EDT, 30 minutes before

Special Weather Statement
National Weather Service Columbia SC
712 PM EDT Sat Jun 27 2020

SCZ020-021-026>028-280015-
Fairfield SC-Lexington SC-Newberry SC-Richland SC-Saluda SC-
712 PM EDT Sat Jun 27 2020

...Strong Thunderstorms Will Impact Portions of southwestern
Fairfield...central Lexington...southern Newberry...central Richland
and northeastern Saluda Counties Until 815 PM EDT....

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

At 712 PM EDT...National Weather Service doppler radar indicated
strong thunderstorms along a line extending from 8 miles east of Lake
Greenwood State Park to near Batesburg-Leesville, moving east at 35
mph.

  HAZARD...strong winds 45 to 55 mph.

  IMPACT...expect minor damage to tree limbs and blowing around of
           light, unsecured objects.

Some locations in the path of these storms include...
Columbia, Lexington, West Columbia, Cayce, Irmo, Forest Acres,
Batesburg-Leesville, Springdale, St. Andrews, Dentsville, Oak Grove,
McEntire Air Base, Highway 6 at Lake Murray Dam, Red Bank, South
Congaree, Pine Ridge, Prosperity, Arcadia Lakes, Columbia
International University and Jenkinsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Boaters on Lake Murray 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.

Persons in campgrounds should seek shelter until these storms pass.

&&

This includes the following highways...
 Interstate 126 between mile markers 0 and 3.
 Interstate 20 in South Carolina between mile markers 45 and 78.
 Interstate 26 between mile markers 80 and 118.
 Interstate 77 between mile markers 0 and 25.

LAT...LON 3430 8111 3391 8068 3387 8155 3421 8190
TIME...MOT...LOC 2312Z 265DEG 31KT 3416 8180 3398 8156

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 6:14 PM EDT	Special Weather Statement	CAE	McCormick	61 min
Jun 27, 6:57 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Edgefield, McCormick	63 min
Jun 27, 7:12 PM EDT	Special Weather Statement	CAE	Lexington, Richland	63 min
Jun 27, 7:21 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Lexington, Newberry, Richland, Saluda	54 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2020 Severe Thunderstorm Warnings in Georgia, 2020 Every severe thunderstorm warning in 2020

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.