Alert archive / South Carolina / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 4, NWS Columbia, SC

March 1, 20187 counties in South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Mar 1, 2018, 4:00 PM EST for 7 counties in South Carolina. It was in force for 60 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: Mar 1, 2018, 4:00 PM EST (21:00 UTC)
Expired: Mar 1, 2018, 5:00 PM EST
In force: 60 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Calhoun County, SC, Clarendon County, SC, Kershaw County, SC, Lee County, SC, Lexington County, SC, Richland County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 45 km from the middle of the area, began a volume at 21:03 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, 9.0 hours before the alert went out and 131 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: 33 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 756 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 231 m²/s²
0-3 km storm-relative helicity: 230 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 Mar 1, 2:13 PM EST, 1 hour 47 minutes earlier.

Area forecast discussion, Mar 1, 2:13 PM EST, 1 hour 47 minutes before

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Hazardous weather outlook, Mar 1, 1:55 PM EST, 2 hours 5 minutes before

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In the hours before

Special weather statement, Mar 1, 2:22 PM EST, 1 hour 38 minutes before

Special Weather Statement
National Weather Service Columbia SC
222 PM EST THU MAR 1 2018

SCZ018-025-011945-
McCormick SC-Edgefield SC-
222 PM EST THU MAR 1 2018

...Strong Winds Will Impact Portions of northwestern Edgefield and
northeastern McCormick Counties Through 245 PM EST...

At 219 PM EST...National Weather Service doppler radar indicated
showers and thunderstorms in McCormick County moving eastward
near 45 mph and toward Edgefield County. Wind gusts around 50 mph
may occur with these storms.

  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 this storm include...
McCormick, Troy and Plum Branch.

LAT...LON 3404 8232 3397 8230 3402 8224 3398 8221
      3397 8218 3399 8215 3399 8210 3398 8205
      3395 8204 3397 8197 3385 8193 3385 8233
      3403 8235
TIME...MOT...LOC 1919Z 265DEG 44KT 3397 8220

Special weather statement, Mar 1, 2:34 PM EST, 1 hour 26 minutes before

Special Weather Statement
National Weather Service Columbia SC
234 PM EST THU MAR 1 2018

SCZ026-012000-
Saluda SC-
234 PM EST THU MAR 1 2018

...Strong Winds Will Impact Portions of Saluda County Through 400
pm...

At 232 PM EST...National Weather Service doppler radar indicated
showers and thunderstorms moving into Saluda County from the west.
Movement of the storms was eastward near 50 mph. Wind gusts of 40 to
50 mph along with brief heavy downpours may occur with these
showers.

  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 this storm include...
Batesburg-Leesville and Saluda.

LAT...LON 3404 8195 3409 8192 3413 8187 3417 8188
      3418 8185 3417 8177 3419 8173 3414 8163
      3396 8153 3388 8157 3389 8187 3398 8190
      3396 8201
TIME...MOT...LOC 1932Z 267DEG 46KT 3400 8197

Special weather statement, Mar 1, 3:06 PM EST, 54 minutes before

Special Weather Statement
National Weather Service Columbia SC
306 PM EST THU MAR 1 2018

SCZ020-021-025>028-030-012030-
Fairfield SC-Lexington SC-Aiken SC-Newberry SC-Richland SC-Saluda SC-
Edgefield SC-
306 PM EST THU MAR 1 2018

...Showers with Strong Wind Approaching the Lake Murray and
Columbia Area...

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

At 304 PM EST...National Weather Service doppler radar indicated
showers just west of the Lake Murray and Columbia area moving
eastward at 45 mph. Expect wind gusts of 40 to 50 mph and brief
heavy downpours with these storms.

  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,
Winnsboro, Springdale, St. Andrews, Batesburg, Red Bank, Dentsville,
Oak Grove, Woodfields, Batesburg-Leesville, South Congaree, Pine
Ridge, Gaston, Arcadia Lakes and Ridge Spring.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Boaters on Lake Murray should seek safe harbor immediately. If caught
on the open water, stay as low as possible and wear a personal
flotation device. Remember, if you can hear thunder you are at risk
for being struck by lightning.

&&

LAT...LON 3441 8080 3432 8080 3418 8087 3413 8080
      3394 8080 3382 8091 3385 8099 3388 8100
      3387 8103 3375 8106 3378 8101 3378 8096
      3372 8101 3365 8118 3368 8183 3443 8134
TIME...MOT...LOC 2004Z 260DEG 41KT 3440 8139 3375 8175

Special weather statement, Mar 1, 3:09 PM EST, 51 minutes before

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Local storm report, Mar 1, 3:50 PM EST, 10 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 1, 2:22 PM EST	Special Weather Statement	CAE	McCormick	23 min
Mar 1, 2:34 PM EST	Special Weather Statement	CAE	Saluda	26 min
Mar 1, 3:06 PM EST	Special Weather Statement	CAE	Fairfield, Lexington, Richland	24 min
Mar 1, 3:09 PM EST	Special Weather Statement	CAE	Lancaster	51 min
Mar 1, 3:38 PM EST	Severe Thunderstorm Warning	CAE	Calhoun, Kershaw, Lee, Lexington, Richland, Sumter	22 min
Mar 1, 3:43 PM EST	Severe Thunderstorm Warning	CAE	Chesterfield, Fairfield, Kershaw, Lancaster, Lee	45 min
Mar 1, 3:49 PM EST	Severe Thunderstorm Warning	CAE	Aiken	30 min
Mar 1, 4:14 PM EST	Special Weather Statement	CAE	Bamberg, Barnwell, Orangeburg	61 min
Mar 1, 4:45 PM EST	Special Weather Statement	CAE	Clarendon	60 min
Mar 1, 4:58 PM EST	Severe Thunderstorm Warning	CAE	Clarendon	17 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2018 Every 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.