Alert archive / South Carolina / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 122, NWS Columbia, SC

July 6, 2017Fairfield County, Kershaw County, Lancaster County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Jul 6, 2017, 7:22 PM EDT for Fairfield County, Kershaw County, Lancaster County, South Carolina. It was in force for 27 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: Jul 6, 2017, 7:22 PM EDT (23:22 UTC)
Expired: Jul 6, 2017, 7:49 PM EDT
In force: 27 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Fairfield County, SC, Kershaw County, SC, Lancaster County, SC

The radar

The Columbia radar (KCAE), 76 km from the middle of the area, began a volume at 23:25 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
Jul 6, 7:29 PM EDT	TSTM WND DMG	7 Nnw Lugoff, SC	REPORTED A TREE DOWN ALONG WATEREE DAM ROAD.

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 12:00Z, 11.4 hours before the alert went out and 171 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: 169 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 1387 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: -12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

533 
WUUS52 KCAE 062322
SVRCAE
SCC039-055-057-070015-
/O.NEW.KCAE.SV.W.0122.170706T2322Z-170707T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Columbia SC
722 PM EDT THU JUL 6 2017

The National Weather Service in Columbia has issued a

* Severe Thunderstorm Warning for...
  Northeastern Fairfield County in central South Carolina...
  Southwestern Lancaster County in central South Carolina...
  Kershaw County in central South Carolina...

* Until 815 PM EDT

* At 721 PM EDT, a severe thunderstorm was located 9 miles east of
  Winnsboro, moving east at 30 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Kershaw, Bethune and Ridgeway. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

If on or near Lake Wateree, 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 3434 8035 3434 8037 3430 8036 3431 8038
      3428 8044 3426 8043 3432 8106 3450 8104
      3458 8038 3456 8038 3451 8034
TIME...MOT...LOC 2321Z 272DEG 27KT 3440 8093 

HAIL...1.00IN
WIND...60MPH
 
$$

RC

1 follow-up statement

029 
WWUS52 KCAE 062349
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
749 PM EDT THU JUL 6 2017

SCC039-055-057-062358-
/O.CAN.KCAE.SV.W.0122.000000T0000Z-170707T0015Z/
Fairfield SC-Lancaster SC-Kershaw SC-
749 PM EDT THU JUL 6 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN FAIRFIELD...
SOUTHWESTERN LANCASTER AND KERSHAW COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning has been cancelled.

LAT...LON 3434 8035 3434 8037 3430 8036 3431 8038
      3428 8044 3426 8043 3432 8106 3450 8104
      3458 8038 3456 8038 3451 8034
TIME...MOT...LOC 2339Z 272DEG 27KT 3439 8068 

$$

RC

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 Jul 6, 2:31 PM EDT, 4 hours 51 minutes earlier.

Area forecast discussion, Jul 6, 2:31 PM EDT, 4 hours 51 minutes before

Area Forecast Discussion
National Weather Service Columbia SC
231 PM EDT Thu Jul 6 2017

.SYNOPSIS...
Typical summer pattern will persist through Friday with Bermuda
high pressure extending from the Western Atlantic into the Gulf
of Mexico and a lee-side trough in the local area. Temperatures
will be above normal through the week. A cold front will move
through over the weekend, then return north as a warm front
early next week. This could result in increased rain chances
across the area.

&&

.NEAR TERM /THROUGH TONIGHT/...
Upper ridge over the southeastern states this afternoon will begin
to slip southward tonight as an upper trough moves into the
Ohio Valley. Bermuda high continues offshore with weak surface
trough across the Midlands into central GA.

RADAR indicated isolated to scattered showers and thunderstorms
over the Midlands and CSRA in the vicinity of a surface trough.
The atmosphere is moderately unstable with Lifted Indices
around minus 6C and CAPES 3000 to 4000 J/kg. Wind shear remains
weak across the area. Dry air aloft suggests a wind threat if
strong updrafts develop. Will continue low pops for convection
into the evening.

Highs this afternoon expected to reach the mid and upper 90s
with Heat index 100-105 degrees. Mainly dry weather tonight
with lows in the low to mid 70s.

&&

.SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/...
The upper ridge will get suppressed farther to the south on
Friday as a long-wave trough approaches from the northwest and
slowly moves through late Friday and Friday night. A weak lee-side
trough at the surface will also move into the area, and could be the
focus for isolated to scattered showers and thunderstorms Friday
afternoon into Friday evening. Despite an increase in cloud cover,
weak compressional heating and a slight downslope component to the
low level flow will keep temperatures in the mid 90s and heat index
values in the 99-104 range.

Focus for storms early Saturday afternoon may be in the east
associated with surface trough...but models suggest an upper
disturbance and weak cold front will approach late in the day so
thunderstorms may be approaching from the Upstate. Front appears
will be slow to move through Saturday night. Presence of boundary
may allow some convection to linger.

&&

.LONG TERM /SUNDAY THROUGH THURSDAY/...
A strong upper level ridge will prevail over the Four Corners
region, while a corresponding long wave through settles over much of
the eastern U.S. through most of the long term period. the weak
front appears to move through our FA early Sunday, and hang up near
the coast Sunday afternoon. The front appears will lift back to the
north some as a warm front early next week. The upper level trough,
increased moisture and the surface front may result in increased
rain chances over the weekend and especially early next week.
Continued chance pops. Temperatures will modify and remain near
normal through early next week.

&&

.AVIATION /18Z THURSDAY THROUGH TUESDAY/...
Scattered to isolated convection will continue across the TAF
sites into early evening. High resolution models indicate a
decrease in coverage by 23Z. Have indicated VCTS in TAFs.

VFR condition forecast overnight into early Friday afternoon.
Fog and stratus potential after 07/06z will be low as winds
will be around 5 knots overnight and slightly drier air will be
in place. Convection should develop again by early afternoon
Friday as an upper level disturbance approaches the area and a
surface trough remains in place across the area.

EXTENDED AVIATION OUTLOOK...Restrictions possible each day in
late night/early morning stratus/fog, along with scattered
mainly afternoon and evening thunderstorms.

&&

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

&&

Hazardous weather outlook, Jul 6, 3:59 AM EDT, 15 hours 23 minutes before

Hazardous Weather Outlook
National Weather Service Columbia SC
359 AM EDT Thu Jul 6 2017

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-070800-
Lincoln-McDuffie-Columbia-Richmond-Burke-Lancaster-Chesterfield-
McCormick-Newberry-Fairfield-Kershaw-Edgefield-Saluda-Lexington-
Richland-Lee-Aiken-Sumter-Barnwell-Orangeburg-Calhoun-Clarendon-
Bamberg-
359 AM EDT Thu Jul 6 2017

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

.DAY ONE...Today and Tonight.
An isolated thunderstorm could reach severe limits this afternoon
and evening, more likely northern areas. Damaging wind gusts will be
the primary hazard with any severe thunderstorms.

Afternoon heat index values near 105.

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

Heat index values 100-105 Friday.

Scattered mainly afternoon and evening thunderstorms each day Friday
through Wednesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Jul 6, 5:48 PM EDT, 1 hour 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
548 PM EDT THU JUL 6 2017

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

0526 PM     TSTM WND DMG     2 SE AIKEN              33.52N 81.70W
07/06/2017                   AIKEN              SC   911 CALL CENTER

            2 TREES DOWN AT POWDERHOUSE RD AND
            WOODWARDIA GLEN IN SE AIKEN.

&&

RC

Local storm report, Jul 6, 6:05 PM EDT, 1 hour 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
605 PM EDT THU JUL 6 2017

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

0553 PM     TSTM WND DMG     11 NW LINCOLNTON        33.91N 82.60W
07/06/2017                   LINCOLN            GA   EMERGENCY MNGR

            REPORTED 10 POWER POLES SNAPPED AND LINES
            DOWN NEAR THE INTERSECTION OF GRABALL ROAD
            AND HIGHWAY 79.

&&

LCV

Local storm report, Jul 6, 6:17 PM EDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
617 PM EDT THU JUL 6 2017

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

0600 PM     TSTM WND DMG     8 NNW NEWBERRY          34.38N 81.68W
07/06/2017                   NEWBERRY           SC   LAW ENFORCEMENT

            REPORTED TREE DOWNED A POWER LINE AND IS
            BLOCKING JALAPA ROAD NEAR I-26.

&&

LCV

Local storm report, Jul 6, 6:58 PM EDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
658 PM EDT THU JUL 6 2017

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

0506 PM     TSTM WND DMG     5 W MURPHYS ESTATES     33.61N 82.02W
07/06/2017                   EDGEFIELD          SC   LAW ENFORCEMENT

            REPORTED A TREE DOWN ON CHERRY TREE LANE.

&&

LCV

Local storm report, Jul 6, 7:01 PM EDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
701 PM EDT THU JUL 6 2017

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

0625 PM     TSTM WND DMG     5 NW JOHNSTON           33.89N 81.87W
07/06/2017                   EDGEFIELD          SC   LAW ENFORCEMENT

            REPORTED SEVERAL TREES DOWN ACROSS THE
            NORTHERN PORTION OF THE COUNTY. ONE AREA WAS
            NEAR OLD CHAPPELLS FERRY ROAD AND LONG CANE
            ROAD.

&&

LCV

Special weather statement, Jul 6, 7:11 PM EDT, 11 minutes before

Special Weather Statement
National Weather Service Columbia SC
711 PM EDT THU JUL 6 2017

SCZ028-029-031-070015-
Sumter-Richland-Lee-
711 PM EDT THU JUL 6 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT LEE...NORTHWESTERN
SUMTER...EASTERN RICHLAND AND SOUTHEASTERN KERSHAW COUNTIES...

At 710 PM EDT, radar indicated strong thunderstorms were located
along a line extending from 7 miles southwest of Bishopville to near
Oakland. Movement was east at 20 mph.

Winds in excess of 40 mph are possible with these storms.

Locations impacted include...
Sumter, Bishopville, Oakland, Mulberry, Oswego, Dalzell, Cherryvale,
Rembert and Stateburg.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

Report large hail...
damaging winds or flooding to local law enforcement. Send reports by
Facebook or Twitter to NWSColumbia, e-
mail us at caewx@noaa.gov or call 803-234-4115.

LAT...LON 3416 8016 3411 8012 3394 8035 3394 8056
      3401 8062 3404 8060 3408 8064 3411 8062
      3410 8058 3417 8047 3423 8043 3428 8044
      3430 8036 3434 8036 3436 8029 3432 8024
      3437 8018 3432 8017 3423 8011 3420 8011
TIME...MOT...LOC 2310Z 256DEG 16KT 3416 8036 3405 8055

RC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 8:07 PM EDT	Special Weather Statement	CAE	Lancaster	53 min
Jul 5, 8:57 PM EDT	Special Weather Statement	CAE	Chesterfield, Kershaw	63 min
Jul 6, 4:48 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Edgefield, McCormick	27 min
Jul 6, 4:58 PM EDT	Special Weather Statement	CAE	McCormick	47 min
Jul 6, 5:11 PM EDT	Special Weather Statement	CAE	McCormick	49 min
Jul 6, 5:16 PM EDT	Severe Thunderstorm Warning	CAE	Aiken	59 min
Jul 6, 5:23 PM EDT	Severe Thunderstorm Warning	CAE	McCormick	52 min
Jul 6, 5:45 PM EDT	Severe Thunderstorm Warning	CAE	Newberry, Saluda	45 min
Jul 6, 5:52 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Barnwell, Orangeburg	53 min
Jul 6, 5:53 PM EDT	Severe Thunderstorm Warning	CAE	Edgefield, Saluda	67 min
Jul 6, 6:14 PM EDT	Severe Thunderstorm Warning	CAE	McCormick	26 min
Jul 6, 6:21 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Lexington, Newberry, Richland	54 min
Jul 6, 7:11 PM EDT	Special Weather Statement	CAE	Lee	64 min
Jul 6, 7:53 PM EDT	Severe Thunderstorm Warning	CAE	Lee, Richland, Sumter	67 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2017 Every severe thunderstorm warning in 2017

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.