Alert archive / South Carolina / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 69, NWS Columbia, SC

June 22, 20184 counties in South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Jun 22, 2018, 11:58 PM EDT for 4 counties in South Carolina. It was in force for 32 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: Jun 22, 2018, 11:58 PM EDT (03:58 UTC)
Expired: Jun 23, 2018, 12:30 AM EDT
In force: 32 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Aiken County, SC, Bamberg County, SC, Barnwell County, SC, Orangeburg County, SC

The radar

The Columbia radar (KCAE), 62 km from the middle of the area, began a volume at 04:00 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
Jun 23, 12:05 AM EDT	TSTM WND DMG	2 Sse Windsor, SC	SC HIGHWAY PATROL REPORTED TREES DOWN ON HERITAGE ROAD AT CHARLESTON HIGHWAY.

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 7 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 00:00Z, 4.0 hours before the alert went out and 156 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: 2283 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 1043 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

As transmitted.

288 
WUUS52 KCAE 230358
SVRCAE
SCC003-009-011-075-230430-
/O.NEW.KCAE.SV.W.0069.180623T0358Z-180623T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Columbia SC
1158 PM EDT FRI JUN 22 2018

The National Weather Service in Columbia has issued a

* Severe Thunderstorm Warning for...
  Central Barnwell County in central South Carolina...
  Northwestern Bamberg County in central South Carolina...
  Central Aiken County in central South Carolina...
  West central Orangeburg County in central South Carolina...

* Until 1230 AM EDT.

* At 1157 PM EDT, severe thunderstorms were located along a line
  extending from near Aiken to 8 miles west of Barnwell, moving east
  at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Aiken, Barnwell, Savannah River Site, Williston, Blackville, New
  Ellenton, Gloverville, Burnettown, Springfield, Snelling, Elko and
  Windsor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection seek shelter inside a sturdy building and stay
away from windows.

Report any hail, damaging winds or flooding directly to the Columbia
National Weather Service at 803 234 4115 when it is safe to do so.
You can also send reports by Facebook or Twitter to NWSColumbia or by
e-mail at NWS.Columbia@noaa.gov.

&&

LAT...LON 3373 8151 3336 8109 3316 8161 3353 8186
TIME...MOT...LOC 0357Z 256DEG 29KT 3352 8169 3328 8151 

HAIL...<.75IN
WIND...60MPH
 
$$

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 22, 10:40 PM EDT, 1 hour 18 minutes earlier.

Area forecast discussion, Jun 22, 10:40 PM EDT, 1 hour 18 minutes before

Area Forecast Discussion
National Weather Service Columbia SC
1040 PM EDT Fri Jun 22 2018

.SYNOPSIS...
A deep upper low will approach from the west through tonight.
Isolated to scattered showers and thunderstorms are expected
each afternoon over the weekend. Sunday and Monday will be very
warm with highs around 100 degrees and heat index values from
105 to 110 degrees. A backdoor cold front will push through the
area early next week bringing temperatures closer to normal for
the extended term.

&&

.NEAR TERM /UNTIL 7 AM SATURDAY MORNING/...
Two areas of convection to cross the area tonight. One area
affecting the Piedmont into the north Midlands. Second area
crossing central GA and will move into the CSRA. LAPs indicating
weak to moderate instability with Lifted Indices around minus 4
and CAPE 1000-2000 J/kg. Effective shear 30 to 40 knots. Have
increased pops to the likely category for the western part of
the forecast area for the next few hours. Damaging wind gusts
possible. Overnight lows in the low to mid 70s with less
cloudiness than previous night.

&&

.SHORT TERM /7 AM SATURDAY MORNING THROUGH SUNDAY NIGHT/...
The upper level trough will lift to the northeast Saturday.
While the NAM still brings a decent shortwave through the area
Saturday morning, the GFS keeps the moisture south. However,
synoptic scale lift will be greatest in the morning while the
area is under the right entrance region of a jet streak to the
north. Therefore, a few showers will remain possible. Much of
the upper level support will be out of the area by Saturday
afternoon with westerly flow limiting moisture advection. Any
storms that do develop will be isolated. Moisture and
instability will be greatest over Georgia, so the best chances
will be across the CSRA during the evening. Shear will be weak,
so the threat of severe weather appears low.

High pressure to the south will build back into the region on
Sunday. Isolated diurnal convection will still be possible, but
limited by downslope flow. This westerly flow will also cause
compressional heating, and Sunday may be warmer than Saturday with
850 mb temps from 20 to 22 C. Heat Index values may therefore range
from 105 to 110 F, nearing Heat Advisory criteria.

&&

.LONG TERM /MONDAY THROUGH FRIDAY/...
There are model discrepancies concerning a cold front that is
supposed to come through Monday. The GFS brings it in from the
north on Sunday night with a decent chance of rain, and then
stalls the front near the coast on Monday. Yet the NAM holds it
back until Monday evening. As a compromise, have increasing
precipitation chances Sunday night and Monday, with the best
chances for scattered storms Monday night and Tuesday. Another
wave could come in late Wednesday with another round of
convection, but there is uncertainty since the ECMWF keeps a
bulk of the moisture well north. The ECMWF doesn't bring this
disturbance through until Thursday. Increasing onshore flow
could fuel diurnal storms on Friday.

It will still be hot on Monday, but then somewhat cooler air
will work its way into the forecast area as the front stalls
near or south of the CSRA. Temperatures will be closer to normal
Tuesday and Wednesday, with highs in the low 90s, then warm
back up into the mid 90s through the end of the week.

&&

.AVIATION /03Z SATURDAY THROUGH WEDNESDAY/...
VFR conditions expected through most of the TAF period with
restrictions in thunderstorms possible into the early morning
hours.

Short wave approaching has generated showers and thunderstorms
to the southwest of the terminals which will be moving into the
terminals over the next couple of hours. Main concern with the
thunderstorms will be strong and gusty winds with observations
reporting gusts around 40 knots. Convection will diminish during
the early morning hours with debris cloudiness and mixing
continuing through daybreak do not expect fog development. With
heating Saturday morning diurnal cumulus will develop with
isolated thunderstorms during the late afternoon and evening.

EXTENDED AVIATION OUTLOOK...Restrictions possible each day in
early morning fog and afternoon and evening thunderstorms.

&&

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

&&

Hazardous weather outlook, Jun 22, 5:10 AM EDT, 18 hours 48 minutes before

Hazardous Weather Outlook
National Weather Service Columbia SC
510 AM EDT Fri Jun 22 2018

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-230915-
Lincoln-McDuffie-Columbia-Richmond-Burke-Lancaster-Chesterfield-
McCormick-Newberry-Fairfield-Kershaw-Edgefield-Saluda-Lexington-
Richland-Lee-Aiken-Sumter-Barnwell-Orangeburg-Calhoun-Clarendon-
Bamberg-
510 AM EDT Fri Jun 22 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.

Low chance of severe storms late this afternoon and evening with
damaging downburst winds as the main threat.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Heat index values from 105 to 110 degrees are possible Sunday and
Monday. A heat advisory may be needed.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Jun 22, 11:11 PM EDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
1111 PM EDT FRI JUN 22 2018

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

0957 PM     TSTM WND DMG     2 SW PEAK               34.21N 81.35W
06/22/2018                   NEWBERRY           SC   LAW ENFORCEMENT

            NEWBERRY COUNTY DISPATCH REPORTED TREES DOWN
            NEAR THE INTERSECTION OF HOLY TRINITY CHURCH
            ROAD AND US 176.

&&

CJR

Local storm report, Jun 22, 11:13 PM EDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
1113 PM EDT FRI JUN 22 2018

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

0945 PM     TSTM WND DMG     1 W LITTLE MOUNTAIN     34.19N 81.43W
06/22/2018                   NEWBERRY           SC   LAW ENFORCEMENT

            NEWBERRY COUNTY DISPATCH REPORTED MULTIPLE
            TREES DOWN NEAR LITTLE MOUNTAIN AND
            PROSPERITY.

&&

CJR

Local storm report, Jun 22, 11:19 PM EDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
1119 PM EDT FRI JUN 22 2018

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

0908 PM     TSTM WND DMG     7 WNW SALUDA            34.04N 81.88W
06/22/2018                   SALUDA             SC   LAW ENFORCEMENT

            SALUDA COUNTY DISPATCH REPORTED MULTIPLE
            TREES DOWN NEAR DOUBLE SPRING ROAD AND
            GREENWOOD HIGHWAY.

&&

CJR

Local storm report, Jun 22, 11:31 PM EDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
1131 PM EDT FRI JUN 22 2018

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

1002 PM     TSTM WND DMG     8 WNW WINNSBORO         34.40N 81.23W
06/22/2018                   FAIRFIELD          SC   LAW ENFORCEMENT

            FAIRFIELD COUNTY DISPATCH REPORTED TREES
            DOWN ON CLARKS BRIDGE ROAD AND RESERVOIR
            ROAD AND POWER LINES DOWN ON HIGHWAY 34 NEAR
            OTHER REPORTS.

&&

CJR

Local storm report, Jun 22, 11:41 PM EDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
1141 PM EDT FRI JUN 22 2018

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

1131 PM     TSTM WND DMG     1 SSE CLEARWATER        33.49N 81.90W
06/22/2018                   AIKEN              SC   LAW ENFORCEMENT

            SC HIGHWAY PATROL REPORTED MULTIPLE TREES
            DOWN ON WILLINGHAM DRIVE NEAR CLEARWATER SC.

&&

CJR

Local storm report, Jun 22, 11:52 PM EDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
1152 PM EDT FRI JUN 22 2018

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

0945 PM     TSTM WND DMG     10 SSW LITTLE MOUNTAIN  34.07N 81.49W
06/22/2018                   SALUDA             SC   PUBLIC

            REPORT OF ONE TREE DOWN ACROSS HOLLEY FERRY
            ROAD NEAR CAROLINA LANE. REPORT VIA SOCIAL
            MEDIA WITH PICTURE OF DAMAGE.

&&

CJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 8:27 PM EDT	Special Weather Statement	CAE	McCormick	33 min
Jun 22, 8:49 PM EDT	Severe Thunderstorm Warning	CAE	Edgefield, McCormick, Saluda	26 min
Jun 22, 9:21 PM EDT	Special Weather Statement	CAE	Newberry, Saluda	39 min
Jun 22, 9:52 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Newberry	23 min
Jun 22, 9:58 PM EDT	Special Weather Statement	CAE	Fairfield	32 min
Jun 22, 10:20 PM EDT	Special Weather Statement	CAE	Lancaster	40 min
Jun 22, 10:30 PM EDT	Special Weather Statement	CAE	Edgefield, McCormick	60 min
Jun 22, 10:56 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Edgefield, McCormick	34 min
Jun 22, 11:22 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Edgefield, McCormick, Saluda	38 min
Jun 23, 12:23 AM EDT	Special Weather Statement	CAE	Calhoun	37 min
Jun 23, 3:17 PM EDT	Special Weather Statement	CAE	Aiken, Barnwell	28 min
Jun 23, 3:35 PM EDT	Special Weather Statement	CAE	Edgefield, McCormick	25 min
Jun 23, 3:48 PM EDT	Special Weather Statement	CAE	Aiken, Barnwell	27 min
Jun 23, 4:06 PM EDT	Special Weather Statement	CAE	Edgefield, McCormick	24 min
Jun 23, 4:27 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Edgefield, Lexington, Saluda	36 min
Jun 23, 4:37 PM EDT	Special Weather Statement	CAE	Edgefield	8 min
Jun 23, 4:47 PM EDT	Special Weather Statement	CAE	Saluda	28 min
Jun 23, 5:05 PM EDT	Special Weather Statement	CAE	McCormick	25 min
Jun 23, 5:37 PM EDT	Special Weather Statement	CAE	Edgefield	23 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.