Alert archive / South Carolina / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 141, NWS Columbia, SC

July 15, 2017Fairfield County, Lancaster County, South Carolina

NWS Columbia, SC issued this severe thunderstorm warning at Jul 15, 2017, 5:00 PM EDT for Fairfield County, Lancaster County, South Carolina. It was in force for 60 min. 2 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 15, 2017, 5:00 PM EDT (21:00 UTC)
Expired: Jul 15, 2017, 6:00 PM EDT
In force: 60 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Fairfield County, SC, Lancaster County, SC

The radar

The Columbia radar (KCAE), 68 km from the middle of the area, began a volume at 21:00 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
Jul 15, 5:09 PM EDT	TSTM WND DMG	12 Nne Winnsboro, SC	FAIRFIELD DISPATCH REPORTED TREES DOWN ON HERITAGE RD.
Jul 15, 5:15 PM EDT	TSTM WND DMG	13 Ne Winnsboro, SC	FAIRFIELD DISPATCH REPORTED TREES DOWN ON HWY 21 AT RIVER RD.

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 2 storm reports to this severe thunderstorm warning; the first came 9 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 9.0 hours before the alert went out and 194 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: 306 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 1239 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -50 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

806 
WUUS52 KCAE 152100
SVRCAE
SCC039-057-152200-
/O.NEW.KCAE.SV.W.0141.170715T2100Z-170715T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Columbia SC
500 PM EDT SAT JUL 15 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...

* Until 600 PM EDT

* At 457 PM EDT, a likely severe thunderstorm was located along
  the Chester and Fairfield county line near Blackstock.
  A developing thunderstorm near Great Falls will likely
  become severe and move into southern Lancaster County.
  The storms were moving east near 25 mph. 

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Blackstock and area of Lancaster County just east of
  Great Falls.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3457 8072 3448 8083 3446 8087 3444 8089
      3452 8119 3456 8117 3454 8088 3455 8087
      3458 8088 3460 8089
TIME...MOT...LOC 2057Z 285DEG 22KT 3455 8107 

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

1 follow-up statement

418 
WWUS52 KCAE 152129
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
529 PM EDT SAT JUL 15 2017

SCC039-152138-
/O.CAN.KCAE.SV.W.0141.000000T0000Z-170715T2200Z/
Fairfield SC-
529 PM EDT SAT JUL 15 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN FAIRFIELD COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened, 
Therefore, the warning has been cancelled.

LAT...LON 3457 8072 3450 8081 3446 8087 3446 8088
      3447 8089 3449 8090 3450 8088 3455 8087
      3460 8089
TIME...MOT...LOC 2128Z 285DEG 22KT 3450 8085 

$$

SCC057-152200-
/O.CON.KCAE.SV.W.0141.000000T0000Z-170715T2200Z/
Lancaster SC-
529 PM EDT SAT JUL 15 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHWESTERN LANCASTER COUNTY...

At 528 PM EDT, a severe thunderstorm was located near Great Falls, or
15 miles south of Lancaster, moving east at 25 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

This severe thunderstorm will remain over mainly rural areas of
southwestern Lancaster County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3457 8072 3450 8081 3446 8087 3446 8088
      3447 8089 3449 8090 3450 8088 3455 8087
      3460 8089
TIME...MOT...LOC 2128Z 285DEG 22KT 3450 8085 

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

HC

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 15, 2:04 PM EDT, 2 hours 56 minutes earlier.

Area forecast discussion, Jul 15, 2:04 PM EDT, 2 hours 56 minutes before

Area Forecast Discussion
National Weather Service Columbia SC
204 PM EDT Sat Jul 15 2017

.SYNOPSIS...
An approaching cold front will stall over the area tonight,
bringing increasing chances for showers and thunderstorms which
may linger through Monday.

&&

.NEAR TERM /THROUGH TONIGHT/...
Expect numerous showers and thunderstorms in the forecast area ahead
of the cold front and its associated pre-frontal trough. The
high-resolution models display the greatest thunderstorm
coverage late this afternoon and evening as strong short wave
trough approaches from Tennessee. Models indicate relatively
strong upper level divergence and associated lift thru 06z. Coverage
may diminish late because of nocturnal cooling and previous
convection, but a threat will linger overnight associated with
convergence ahead of the cold front and upper troughing moving
into the region. A limiting factor for severe thunderstorms is
relatively weak deep-layer shear. However, moderate to strong
instability and heavy precipitation loading supports possible
damaging wind with the thunderstorms. So pulse storms expected
with the possibility of some organization this evening. Nam qpf
appears overdone and likely because of convective feedback. But
with precipitable water around 2 inches expect heavy rain
potential with some localized flooding possible.

&&

.SHORT TERM /SUNDAY THROUGH SUNDAY NIGHT/...
The main front will stall out across the forecast area Sunday,
and this will remain the focusing mechanism for additional
showers and thunderstorms through Sunday night. Several short
wave troughs rotating through amplified eastern CONUS upper
level trough. Nam appears to dry out upper levels quicker late
Sunday than other models. With front in the area prefer higher
pops thru Sunday night. Shear remains weak, with moderate
instability Sunday, and cannot rule out a few strong or even
severe thunderstorms. Temperatures will begin to cool off
slightly as the front moves into the area, with readings near
90. Overnight lows each night in the middle 70s.

&&

.LONG TERM /MONDAY THROUGH SATURDAY/...
Although the frontal boundary in the area will continue to
weaken Monday, there should still be enough low-level moisture
and instability across the area to aid in the development of
scattered afternoon and evening convection. Models showing the
potential for a weak cut-off upper low developing over the area
Tuesday through Wednesday as the cwa gets squeezed between the
strong ridge across the central US and another ridge in the
western Atlantic. Ridge retrogrades late in the period. Still
expecting the convection to become more diurnal and more
scattered to isolated later in the week. Temperatures near
normal early in the period but warming trend late week to above
normal again.

&&

.AVIATION /18Z SATURDAY THROUGH THURSDAY/...
Convection expected into tonight...with fog and stratus during
the early morning and sunrise hours.

Active period ahead as convection has begun developing around
AGs/DNL/OGB with a front moving into the Upstate generating a
line of convection moving toward the terminals. Expect
thunderstorms across the area through 03z...possibly later as
outflow boundaries intersect and generate new cells. Main
concern with thunderstorms is potential for strong wind gusts.
With rain expected will see stratus and fog develop through the
early morning and sunrise hours with with IFR cigs and vsbys at
all terminals. Conditions will return to VFR from 14z through
the end of the period with cumulus and another round of
convection again developing near the end of the period.

EXTENDED AVIATION OUTLOOK...High confidence in showers and
thunderstorms with associated restrictions through Monday as a
front stalls over the area. Low confidence in showers and
thunderstorms Tuesday through Thursday. High potential for late
night/early morning stratus and fog each day.

&&

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

&&

Hazardous weather outlook, Jul 15, 11:57 AM EDT, 5 hours 3 minutes before

Hazardous Weather Outlook
National Weather Service Columbia SC
1157 AM EDT Sat Jul 15 2017

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-161600-
Lincoln-McDuffie-Columbia-Richmond-Burke-Lancaster-Chesterfield-
McCormick-Newberry-Fairfield-Kershaw-Edgefield-Saluda-Lexington-
Richland-Lee-Aiken-Sumter-Barnwell-Orangeburg-Calhoun-Clarendon-
Bamberg-
1157 AM EDT Sat Jul 15 2017

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

.DAY ONE...This Afternoon and Tonight.

Thunderstorms this afternoon and tonight could possibly contain
damaging wind. The storms may also contain heavy rain with localized
flooding.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

A few thunderstorms with damaging wind will be possible Sunday into
Monday along a stalled front. The storms may also contain heavy rain
with localized flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required.

In the hours before

Local storm report, Jul 15, 3:35 PM EDT, 1 hour 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
335 PM EDT SAT JUL 15 2017

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

0319 PM     TSTM WND DMG     8 NNE EHRHARDT          33.20N 80.96W
07/15/2017                   BAMBERG            SC   LAW ENFORCEMENT

            TREES DOWN ON OAK GROVE ROAD.

&&

DA

Special weather statement, Jul 15, 3:57 PM EDT, 1 hour 3 minutes before

Special Weather Statement
National Weather Service Columbia SC
357 PM EDT SAT JUL 15 2017

SCZ015-016-022-152030-
Lancaster-Chesterfield-Kershaw-
357 PM EDT SAT JUL 15 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN
CHESTERFIELD AND NORTHERN KERSHAW COUNTIES...

At 354 PM EDT, strong thunderstorms were in northern
Kershaw County moving east near 15 mph. There storms
will affect the area extending from Westville to
McBee.

Wind gusts up to 50 mph are possible with these storms.

Heavy rain will lead to ponding of water in poor-
drainage area. Do not drive on flooded roads.

Locations impacted include...
Mcbee and Bethune.

LAT...LON 3437 8075 3448 8081 3458 8055 3453 8001
      3432 8040
TIME...MOT...LOC 1954Z 283DEG 11KT 3447 8051

Local storm report, Jul 15, 4:13 PM EDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
413 PM EDT SAT JUL 15 2017

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

0347 PM     TSTM WND DMG     2 NW VANCE              33.46N 80.44W
07/15/2017                   ORANGEBURG         SC   LAW ENFORCEMENT

            TREES DOWN 9843 OLD NUMBER SIX HIGHWAY.

&&

DA

Local storm report, Jul 15, 4:17 PM EDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
417 PM EDT SAT JUL 15 2017

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

0350 PM     TSTM WND GST     2 NE VANCE              33.45N 80.40W
07/15/2017  E60 MPH          ORANGEBURG         SC   PUBLIC

            MILL CREEK MARINA REPORTED ESTMD WIND GUSTS
            OF 50-60 MPH.

&&

DA

Special weather statement, Jul 15, 4:21 PM EDT, 39 minutes before

Special Weather Statement
National Weather Service Columbia SC
421 PM EDT SAT JUL 15 2017

SCZ025-030-152045-
Aiken-Edgefield-
421 PM EDT SAT JUL 15 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL EDGEFIELD AND WEST
CENTRAL AIKEN COUNTIES...

At 419 PM EDT, a strong thunderstorm was in the Belvedere area. The
storm was moving east near 20 mph and toward the Graniteville area.

Wind gusts up to 50 mph are possible with this storm.

Locations impacted include...
North Augusta, Belvedere, Clearwater, Gloverville and Burnettown.

LAT...LON 3350 8198 3354 8201 3368 8180 3340 8175
TIME...MOT...LOC 2019Z 273DEG 3KT 3355 8196

Local storm report, Jul 15, 4:37 PM EDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE COLUMBIA SC
437 PM EDT SAT JUL 15 2017

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

0357 PM     HAIL             VANCE                   33.43N 80.42W
07/15/2017  E0.75 INCH       ORANGEBURG         SC   PUBLIC

            PEA TO DIME-SIZE HAIL REPORTED IN VANCE.
            REPORT RECEIVED VIA SOCIAL MEDIA.

&&

DA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 2:14 PM EDT	Special Weather Statement	CAE	Bamberg	31 min
Jul 15, 2:25 PM EDT	Special Weather Statement	CAE	Orangeburg	35 min
Jul 15, 2:57 PM EDT	Severe Thunderstorm Warning	CAE	Bamberg, Orangeburg	33 min
Jul 15, 3:18 PM EDT	Special Weather Statement	CAE	Clarendon	27 min
Jul 15, 3:33 PM EDT	Areal Flood Advisory	CAE	Bamberg, Orangeburg	117 min
Jul 15, 3:44 PM EDT	Severe Thunderstorm Warning	CAE	Clarendon, Orangeburg	31 min
Jul 15, 3:57 PM EDT	Special Weather Statement	CAE	Kershaw	33 min
Jul 15, 4:21 PM EDT	Special Weather Statement	CAE	Aiken	24 min
Jul 15, 4:42 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Newberry	48 min
Jul 15, 5:02 PM EDT	Severe Thunderstorm Warning	CAE	Lee	28 min
Jul 15, 5:15 PM EDT	Severe Thunderstorm Warning	CAE	Fairfield, Kershaw, Richland	60 min
Jul 15, 5:29 PM EDT	Special Weather Statement	CAE	Chesterfield	46 min
Jul 15, 5:53 PM EDT	Severe Thunderstorm Warning	CAE	Aiken, Lexington, Orangeburg	52 min
Jul 15, 6:19 PM EDT	Severe Thunderstorm Warning	CAE	Barnwell	45 min
Jul 15, 6:41 PM EDT	Severe Thunderstorm Warning	CAE	Edgefield, McCormick, Saluda	49 min
Jul 15, 7:16 PM EDT	Areal Flood Advisory	CAE	Calhoun, Lexington, Richland	119 min
Jul 15, 7:44 PM EDT	Special Weather Statement	CAE	Barnwell	31 min
Jul 15, 7:50 PM EDT	Areal Flood Advisory	CAE	Aiken, Barnwell	115 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.