Alert archive / South Carolina / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 121, NWS Columbia, SC

July 6, 20174 counties in South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Jul 6, 2017, 6:21 PM EDT for 4 counties in South Carolina. It was in force for 54 min. 4 reports 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, 6:21 PM EDT (22:21 UTC)
Expired: Jul 6, 2017, 7:15 PM EDT
In force: 54 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Fairfield County, SC, Lexington County, SC, Newberry County, SC, Richland County, SC

The radar

The Columbia radar (KCAE), 43 km from the middle of the area, began a volume at 22:20 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, 6:39 PM EDT	TSTM WND DMG	2 Ene Lake Murray Of Ri, SC	TREE DOWN ON POWER LINES ON BICKLEY ROAD ACROSS FROM BALLENTINE ELEMENTARY SCHOOL.
Jul 6, 6:55 PM EDT	TSTM WND DMG	9 Ssw Winnsboro Mills, SC	TREE DOWN NEAR THE INTERSECTION OF HIGHWAY 269 AND LANDIS ROAD. TIME ESTIMATED BASED ON RADAR.
Jul 6, 7:04 PM EDT	TSTM WND DMG	2 Nw Blythewood, SC	REPORTED TREES DOWN ALONG I-77 NEAR THE RICHLAND COUNTY AND FAIRFIELD COUNTY LINE.
Jul 6, 7:06 PM EDT	TSTM WND DMG	3 Ne Gilbert, SC	PUBLIC REPORT VIA TWITTER OF TREES DOWN/UPROOTED. TREE UPROOTED AND DOWN ON HOUSE.

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 4 storm reports to this severe thunderstorm warning; the first came 18 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, 10.4 hours before the alert went out and 190 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.

202 
WUUS52 KCAE 062221
SVRCAE
SCC039-063-071-079-062315-
/O.NEW.KCAE.SV.W.0121.170706T2221Z-170706T2315Z/

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

The National Weather Service in Columbia has issued a

* Severe Thunderstorm Warning for...
  Fairfield County in central South Carolina...
  Eastern Newberry County in central South Carolina...
  Northwestern Lexington County in central South Carolina...
  Northwestern Richland County in central South Carolina...

* Until 715 PM EDT

* At 621 PM EDT, severe thunderstorms were located along a line
  extending from near Blackstock to near Saluda, moving east at 25
  mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Lexington, Irmo, Winnsboro, St. Andrews, Red Bank, Blythewood,
  Chapin, Gilbert, Summit, Ridgeway, Little Mountain, Pomaria, Peak,
  Seven Oaks, Lake Murray Of Richland and Winnsboro Mills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Damaging winds and continuous cloud to ground lightning is occurring 
with these storms. 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 Murray, get away from the water and move indoors 
or inside a vehicle. The winds will be strong enough to capsize a 
small boat. 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 3454 8088 3450 8088 3449 8090 3447 8089
      3441 8083 3441 8078 3438 8077 3426 8083
      3391 8128 3394 8153 3407 8147 3408 8148
      3408 8150 3449 8144 3450 8142 3457 8141
TIME...MOT...LOC 2221Z 262DEG 20KT 3457 8105 3402 8169 

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

JAQ

1 follow-up statement

216 
WWUS52 KCAE 062242
SVSCAE

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

SCC039-063-071-079-062315-
/O.CON.KCAE.SV.W.0121.000000T0000Z-170706T2315Z/
Fairfield SC-Newberry SC-Lexington SC-Richland SC-
642 PM EDT THU JUL 6 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR FAIRFIELD...SOUTHEASTERN NEWBERRY...NORTHWESTERN LEXINGTON AND
NORTHWESTERN RICHLAND COUNTIES...

At 641 PM EDT, severe thunderstorms were located along a line
extending from Great Falls to 8 miles north of Leesville, moving east
at 25 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Lexington, Irmo, Winnsboro, St. Andrews, Red Bank, Blythewood,
Chapin, Gilbert, Summit, Ridgeway, Little Mountain, Pomaria, Peak,
Seven Oaks, Lake Murray Of Richland and Winnsboro Mills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Murray, 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 3454 8088 3450 8088 3449 8090 3447 8089
      3441 8083 3441 8078 3438 8077 3426 8083
      3391 8128 3394 8153 3407 8147 3408 8148
      3408 8150 3425 8147 3455 8102
TIME...MOT...LOC 2241Z 262DEG 20KT 3458 8092 3404 8156 

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

JAQ

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, 3 hours 50 minutes earlier.

Area forecast discussion, Jul 6, 2:31 PM EDT, 3 hours 50 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, 14 hours 22 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

Special weather statement, Jul 6, 4:58 PM EDT, 1 hour 23 minutes before

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

GAZ040-SCZ018-025-062145-
Lincoln-McCormick-Edgefield-
458 PM EDT THU JUL 6 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN LINCOLN...
NORTHWESTERN EDGEFIELD AND MCCORMICK COUNTIES...

At 457 PM EDT, a strong thunderstorm was located over Calhoun Falls,
or 12 miles east of Middleton, moving east at 35 mph.

Winds in excess of 40 mph are possible with this storm.

Locations impacted include...
McCormick, Lake Strom Thurmond, Bobby Brown State Park, Bradley,
Willington and Mount Carmel.

If you are on or near Lake Thurmond, get out of the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
10 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.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

LAT...LON 3398 8261 3396 8257 3402 8259 3407 8253
      3408 8248 3406 8245 3406 8233 3397 8230
      3402 8224 3397 8218 3399 8210 3398 8205
      3395 8204 3396 8201 3382 8205 3392 8263
      3398 8265
TIME...MOT...LOC 2057Z 272DEG 32KT 3407 8255

LCV

Special weather statement, Jul 6, 5:11 PM EDT, 1 hour 10 minutes before

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

GAZ040-064-SCZ018-025-062200-
Lincoln-Columbia-McCormick-Edgefield-
511 PM EDT THU JUL 6 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN COLUMBIA...LINCOLN...
NORTHWESTERN EDGEFIELD AND CENTRAL MCCORMICK COUNTIES...

At 511 PM EDT, a strong thunderstorm was located near Lincolnton, or
21 miles east of Washington, moving east at 30 mph.

Winds in excess of 40 mph are possible with this storm.

Locations impacted include...
McCormick, Lincolnton, Parksville, Plum Branch and Modoc.

If you are on or near Lake Thurmond, get out of the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
10 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.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

LAT...LON 3388 8203 3367 8210 3374 8255 3383 8260
      3386 8257 3387 8258 3386 8260 3386 8261
      3392 8263
TIME...MOT...LOC 2111Z 267DEG 27KT 3380 8237

LCV

Local storm report, Jul 6, 5:26 PM EDT, 55 minutes before

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

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

0452 PM     TSTM WND DMG     2 N MARTINEZ            33.55N 82.09W
07/06/2017                   COLUMBIA           GA   LAW ENFORCEMENT

            REPORTED A COUPLE OF TREES DOWN ALONG, DOT
            BARRELS BLOWN ALL OVER ROADWAY AND TRAFFIC
            LIGHTS OUT. THESE OCCURRED ALONG FURYS FERRY
            ROAD, POINT COMFORT ROAD, GIBBS ROAD AND
            RIVERWATCH PARKWAY.

&&

LCV

Local storm report, Jul 6, 5:48 PM EDT, 33 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, 16 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, 4 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

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, 7:11 PM EDT	Special Weather Statement	CAE	Lee	64 min
Jul 6, 7:22 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Kershaw, Lancaster	27 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.