Alert archive / South Carolina / Special Weather Statements in 2017

Special Weather Statement, NWS Columbia, SC

August 31, 2017Lexington County, South Carolina

NWS Columbia, SC issued this special weather statement at Aug 31, 2017, 4:53 PM EDT for Lexington County, South Carolina. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 31, 2017, 4:53 PM EDT (20:53 UTC)
Expired: Aug 31, 2017, 5:30 PM EDT
In force: 37 min
Issued by: NWS Columbia, SC

County Lexington County, SC

The radar

The Columbia radar (KCAE), 22 km from the middle of the area, began a volume at 20:57 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, 8.9 hours before the alert went out and 177 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: 331 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 812 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 31, 2:30 PM EDT, 2 hours 23 minutes earlier.

Area forecast discussion, Aug 31, 2:30 PM EDT, 2 hours 23 minutes before

Area Forecast Discussion
National Weather Service Columbia SC
230 PM EDT Thu Aug 31 2017

.SYNOPSIS...
Shower and thunderstorm chances will continue through the end
of the week as the remnants of TS Harvey bring increasing
moisture to the region. Drier air will filter into the region by
late in the Holiday weekend with temperatures near normal. A
cold front will approach from the west around the middle of next
week.

&&

.NEAR TERM /THROUGH TONIGHT/...
The remnants of Tropical Storm Harvey will lift from the lower
Mississippi River Valley toward the Tennessee River Valley
bringing increased moisture. A warm front over central GA this
afternoon will lift north across the area tonight. Already
seeing moderate instability over the CSRA into the Central
Midlands. Mid-level short wave energy combined with moderate
instability and Precipitable water values between 2.0 and 2.3
inches allowing convection to develop this afternoon. Scattered
to numerous showers and thunderstorms are expected into the
evening. Could see a few severe storms...especially across the
southern Midlands and CSRA where instability and shear is
greatest. Damaging winds appear to be the main threat. An
isolated tornado threat cannot be ruled out. Afternoon
temperatures will peak in the lower 80s north to near 90 south.

Scattered showers and thunderstorms are expected to continue
through the early portions of tonight, before becoming more
isolated late tonight. With the energy associated with the
remnants of Harvey rotating around the eastern side of the low,
and with a weak warm front lingering across the Midlands
overnight...can not rule out a few strong storms tonight,
especially over the western portions of the forecast area.
Overnight lows will be in the lower 70s.

&&

.SHORT TERM /FRIDAY THROUGH FRIDAY NIGHT/...
On Friday, the remnants of Harvey will push mainly over the TN
Valley, while a cold front begins pushing southward towards the
forecast area through the day. With the increased shear along
the front as it moves into the area, expect another round of
stronger storms to develop during the afternoon hours. There is
a risk of severe storms during the afternoon and evening hours.
The latest Day 2 severe weather outlook from SPC has much of the
northern half of the state in Slight Risk with the rest of the
state in Marginal Risk for Friday. The cold front should move
through the area late Friday night, with storms still possible
along the front. Some drier air may begin filtering into the
area from the west late Friday night.

Temperatures Friday will range from the lower to middle 80s
north to near 90 across the southern Midlands and CSRA. most of
the area in warm sector. Readings on Friday night slightly
cooler with temperatures in the upper 60s to lower 70s.

&&

.LONG TERM /SATURDAY THROUGH THURSDAY/...
Drier airmass moving into the area behind the cold front on
Saturday will allow for diminished rain chances as the day goes
on. Dry weather expected to continue into Tuesday as high
pressure settles into the region. Latest GFS indicating
moisture return on Wednesday into Thursday ahead of the next
upper system. Temperatures generally close to normal Saturday
through Wednesday, and a little below normal Thursday.

&&

.AVIATION /18Z THURSDAY THROUGH TUESDAY/...
Scattered convection expected to increase in coverage into the
evening as the area of storms over GA moves east into the CSRA
and Midlands. Have indicated tempo at all TAF sites through
01/00Z. Should see convection decreasing after sunset as
instability weakens...though at least isolated convection is
possible overnight. Models indicate potential for stratus with
MVFR/IFR conditions to develop overnight...then improving to VFR
by late morning. Scattered to numerous showers and thunderstorms
should once again develop Friday afternoon.

EXTENDED AVIATION OUTLOOK...Showers and thunderstorms expected
across the area Friday afternoon into Saturday as the remnants
of Harvey lifts north from the TN Valley into the Ohio River
Valley.

&&

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

&&

Hazardous weather outlook, Aug 31, 3:50 AM EDT, 13 hours 3 minutes before

Hazardous Weather Outlook
National Weather Service Columbia SC
350 AM EDT Thu Aug 31 2017

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-010800-
Lincoln-McDuffie-Columbia-Richmond-Burke-Lancaster-Chesterfield-
McCormick-Newberry-Fairfield-Kershaw-Edgefield-Saluda-Lexington-
Richland-Lee-Aiken-Sumter-Barnwell-Orangeburg-Calhoun-Clarendon-
Bamberg-
350 AM EDT Thu Aug 31 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.

Scattered showers and thunderstorms this afternoon and tonight may
bring strong winds and brief heavy rainfall to the area.

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

Additional showers and thunderstorms remain possible on Friday as the
remnants of Harvey move north of the area, and a cold front moves
southward. Isolated severe storms with strong winds and heavy
rainfall will be possible on Friday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Aug 31, 4:02 PM EDT, 51 minutes before

Special Weather Statement
National Weather Service Columbia SC
402 PM EDT THU AUG 31 2017

SCZ015-021-022-312100-
Fairfield-Lancaster-Kershaw-
402 PM EDT THU AUG 31 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN FAIRFIELD...
SOUTHERN LANCASTER AND CENTRAL KERSHAW COUNTIES...

At 402 PM EDT, a strong thunderstorm was located over Winnsboro,
moving east at 25 mph.

Wind gusts up to 50 mph and pea size hail are possible with this
storm.

Locations impacted include...
Winnsboro, Kershaw, Heath Springs, Ridgeway and Winnsboro Mills.

LAT...LON 3469 8053 3432 8042 3427 8110 3448 8113
      3455 8094 3454 8088 3457 8087
TIME...MOT...LOC 2002Z 251DEG 22KT 3438 8104

CJR

Local storm report, Aug 31, 4:21 PM EDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
421 PM EDT THU AUG 31 2017

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

0351 PM     TSTM WND DMG     2 WNW NEW ELLENTON      33.44N 81.72W
08/31/2017                   AIKEN              SC   LAW ENFORCEMENT

            HIGHWAY PATROL REPORTED POWER LINES DOWN
            NEAR THE INTERSECTION OF DRY BRANCH ROAD AND
            CHIME BELL CHURCH ROAD.

&&

LCV

Local storm report, Aug 31, 4:26 PM EDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
426 PM EDT THU AUG 31 2017

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

0352 PM     TSTM WND DMG     3 WSW GROVETOWN         33.44N 82.25W
08/31/2017                   COLUMBIA           GA   LAW ENFORCEMENT

            SHERIFF DISPATCH REPORTED TREES DOWN ALONG
            OLD LOUISVILLE ROAD AND YOUNG DRIVE.

&&

LCV

Special weather statement, Aug 31, 4:26 PM EDT, 27 minutes before

Special Weather Statement
National Weather Service Columbia SC
426 PM EDT THU AUG 31 2017

SCZ027-030-312100-
Lexington-Aiken-
426 PM EDT THU AUG 31 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN LEXINGTON AND
NORTHEASTERN AIKEN COUNTIES...

At 425 PM EDT, a strong thunderstorm was located 10 miles north of
Aiken, moving east at 35 mph.

Winds up to 40 mph are possible with this storm.

Locations impacted include...
Wagener.

LAT...LON 3355 8165 3377 8171 3379 8169 3389 8130
      3366 8124
TIME...MOT...LOC 2025Z 255DEG 32KT 3368 8167

CJR

Special weather statement, Aug 31, 4:29 PM EDT, 24 minutes before

Special Weather Statement
National Weather Service Columbia SC
429 PM EDT THU AUG 31 2017

SCZ031-036>038-312115-
Orangeburg-Calhoun-Clarendon-Sumter-
429 PM EDT THU AUG 31 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN CALHOUN...WEST
CENTRAL CLARENDON...SOUTHWESTERN SUMTER AND NORTH CENTRAL ORANGEBURG
COUNTIES...

At 429 PM EDT, a strong thunderstorm was located near Brookdale,
moving northeast at 30 mph.

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

Locations impacted include...
Brookdale, St. Matthews, Summerton, Elloree, Pinewood, Cameron,
Wilkinson Heights and Wedgewood.

If you are on or near Lake Marion, 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.

LAT...LON 3360 8029 3348 8083 3360 8091 3376 8069
      3377 8066 3376 8066 3375 8064 3375 8061
      3379 8060 3381 8060 3381 8061 3389 8051
TIME...MOT...LOC 2029Z 245DEG 25KT 3356 8079

CJR

Special weather statement, Aug 31, 4:53 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Columbia SC
453 PM EDT THU AUG 31 2017

SCZ027-028-312130-
Lexington-Richland-
453 PM EDT THU AUG 31 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN LEXINGTON AND
NORTHWESTERN RICHLAND COUNTIES...

At 453 PM EDT, a strong thunderstorm was located 7 miles northwest of
Lexington, moving east at 30 mph.

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

Locations impacted include...
Columbia, Lexington, West Columbia, Irmo, St. Andrews, Oak Grove,
Chapin, Seven Oaks and Lake Murray Of Richland.

If you are on or near Lake Murray, 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.

LAT...LON 3398 8109 3402 8144 3408 8142 3407 8141
      3407 8139 3411 8142 3416 8140 3416 8105
TIME...MOT...LOC 2053Z 274DEG 26KT 3406 8131

CJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 3:26 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Edgefield, McCormick	64 min
Aug 31, 4:00 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Barnwell, Orangeburg	37 min
Aug 31, 4:02 PM EDT	Special Weather Statement	CAE	Kershaw	58 min
Aug 31, 4:26 PM EDT	Special Weather Statement	CAE	Aiken	34 min
Aug 31, 4:29 PM EDT	Special Weather Statement	CAE	Calhoun	46 min
Aug 31, 4:41 PM EDT	Severe Thunderstorm Warning	CAE	Kershaw, Lee	64 min
Aug 31, 5:06 PM EDT	Severe Thunderstorm Warning	CAE	Chesterfield, Kershaw	54 min
Aug 31, 5:12 PM EDT	Severe Thunderstorm Warning	CAE	Lee	48 min
Aug 31, 5:14 PM EDT	Special Weather Statement	CAE	Bamberg	46 min
Aug 31, 5:33 PM EDT	Special Weather Statement	CAE	Clarendon	57 min
Aug 31, 6:17 PM EDT	Special Weather Statement	CAE	Clarendon	28 min
Aug 31, 2:42 PM EDT	Special Weather Statement	CAE	Columbia, McDuffie, Richmond	48 min

Nearby

Special Weather Statements in South Carolina, 2017 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.