Alert archive / South Carolina / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 62, NWS Greenville-Spartanburg, SC

May 30, 2016Oconee County, South Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at May 30, 2016, 4:18 PM EDT for Oconee County, South Carolina. It was in force for 30 min. 3 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
May 30, 2016, 4:18 PM EDT (20:18 UTC)
Expired
May 30, 2016, 4:48 PM EDT
In force
30 min
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Oconee County, SC

The radar

The Greer radar (KGSP), 70 km from the middle of the area, began a volume at 20:20 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

TimeReportWhereRemark
May 30, 4:27 PM EDTHAIL 0.5Walhalla, SC
May 30, 4:27 PM EDTHAIL 11 Nne Walhalla, SCHAIL OBSERVED NEAR SERTOMA FIELD. STRONG WINDS WERE OBSERVED AT THE TIME OF THE HAIL.
May 30, 4:28 PM EDTTSTM WND DMG3 Se Walhalla, SCA FEW TREES DOWN BY STORM WINDS TO THE SOUTHEAST OF WALHALLA AND ONE TREE REPORTED DOWN NEAR SENECA.

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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.3 hours before the alert went out and 206 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 12:00Z on 2016-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 144 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 12:00Z on 2016-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
144 J/kg
Mixed-layer CIN
-139 J/kg
Mixed-layer LCL
1227 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
48 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

751 
WUUS52 KGSP 302018
SVRGSP
SCC073-302100-
/O.NEW.KGSP.SV.W.0062.160530T2018Z-160530T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
418 PM EDT MON MAY 30 2016

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL OCONEE COUNTY IN UPSTATE SOUTH CAROLINA...

* UNTIL 500 PM EDT

* AT 417 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER WALHALLA...
  MOVING SOUTH AT 15 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...
  SENECA...WALHALLA...WESTMINSTER...OAKWAY AND LAKE KEOWEE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BRIEF DAMAGING WINDS WILL BLOW DOWN TREES AND POWER LINES OVER SMALL
AREAS. A BRIEF PERIOD OF LARGE HAIL IS ALSO POSSIBLE. SEEK SHELTER
INSIDE AN INTERIOR ROOM.

PLEASE REPORT DAMAGING WINDS...HAIL...OR FLOODING TO THE NATIONAL
WEATHER SERVICE GREENVILLE-SPARTANBURG BY CALLING TOLL
FREE...1...800... 2 6 7...8 1 0 1...OR BY POSTING ON OUR FACEBOOK
PAGE...OR TWEET IT USING HASHTAG NWSGSP. YOUR MESSAGE SHOULD
DESCRIBE THE EVENT AND THE SPECIFIC LOCATION WHERE IT OCCURRED.

&&

LAT...LON 3481 8318 3487 8297 3475 8290 3474 8290
      3474 8289 3464 8283 3463 8284 3464 8285
      3462 8286 3455 8312
TIME...MOT...LOC 2017Z 340DEG 13KT 3477 8305 

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

MOORE
2 follow-up statements
698 
WWUS52 KGSP 302031
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
431 PM EDT MON MAY 30 2016

SCC073-302100-
/O.CON.KGSP.SV.W.0062.000000T0000Z-160530T2100Z/
OCONEE SC-
431 PM EDT MON MAY 30 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR SOUTHEASTERN OCONEE COUNTY...

AT 431 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WALHALLA...
MOVING SOUTHEAST AT 15 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...
SENECA...WALHALLA...WESTMINSTER...OAKWAY AND LAKE KEOWEE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT DAMAGING WINDS...HAIL...OR FLOODING TO THE NATIONAL
WEATHER SERVICE GREENVILLE-SPARTANBURG BY CALLING TOLL
FREE...1...800... 2 6 7...8 1 0 1...OR BY POSTING ON OUR FACEBOOK
PAGE...OR TWEET IT USING HASHTAG NWSGSP. YOUR MESSAGE SHOULD
DESCRIBE THE EVENT AND THE SPECIFIC LOCATION WHERE IT OCCURRED.

&&

LAT...LON 3479 8310 3482 8300 3475 8290 3474 8290
      3474 8289 3464 8283 3463 8284 3464 8285
      3462 8286 3455 8312
TIME...MOT...LOC 2031Z 335DEG 12KT 3474 8302 

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

MOORE
031 
WWUS52 KGSP 302048
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
448 PM EDT MON MAY 30 2016

SCC073-302057-
/O.CAN.KGSP.SV.W.0062.000000T0000Z-160530T2100Z/
OCONEE SC-
448 PM EDT MON MAY 30 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OCONEE COUNTY 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.  HOWEVER HEAVY RAIN IS
STILL POSSIBLE WITH THIS THUNDERSTORM. 

BOATERS ON LAKE KEOWEE SHOULD REMAIN ON SHORE AS CLOUD-TO-GROUND
LIGHTNING IS STILL A THREAT...ESPECIALLY OVER THE SOUTHERN END OF
THE LAKE.

LAT...LON 3479 8310 3482 8300 3475 8290 3474 8290
      3474 8289 3464 8283 3463 8284 3464 8285
      3462 8286 3455 8312
TIME...MOT...LOC 2046Z 340DEG 13KT 3468 8299 

$$

MOORE

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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at May 30, 2:38 PM EDT, 1 hour 40 minutes earlier.

Area forecast discussion, May 30, 2:38 PM EDT, 1 hour 40 minutes before
Area Forecast Discussion
National Weather Service Greenville-Spartanburg SC
238 PM EDT MON MAY 30 2016

.SYNOPSIS...
The remnants of tropical system Bonnie will slowly lift northeast
along the Carolina Coast over the next couple of days. Moisture will
increase ahead of a cold front approaching from the northwest
Thursday and Friday. The front will move through the region on
Saturday but likely stall nearby over the weekend.

&&

.NEAR TERM /THROUGH TUESDAY/...
As of 130 PM: Cumulus have grown over the mountains in the past
90 minutes or so, and showers are now seen on radar over SW NC
and on the Blue Ridge north of I-40. This appears to agree with
most of the meso guidance, and following them, the expectation
remains that this activity will gradually propagate southeastward
into the upper Piedmont. Further upstream, discrete convection is
lining up along a weak boundary near the KY/WV/VA borders. While
these cells will gradually spread south, it appears unlikely they
will reach the NC Mtns before late afternoon, if they survive that
long. We'll keep an eye on that activity over the next few hrs.

The remnants of former tropical cyclone Bonnie will remain invof
the "Grand Strand" into Tuesday morning, before beginning a gradual
northeastward movement by the end of the day. With the low remaining
on our periphery, northeasterly low level flow will continue over
our CWFA. This will provide enhanced moisture as well as very weak
convergence, which could allow some shower activity to persist
overnight. Plus, morning stratus is expected to develop over the
eastern third of the CWFA. Elsewhere, only cirrus are expected to
be seen overnight, and with winds remaining light, patchy fog is
expected to develop in some areas. Notable visibility restrictions
currently are not anticipated. Mins tonight will be a category or
two above normal.

Despite Bonnie and the boundary sagging southward from KY/VA,
diurnally driven instability will be the main justification for
PoPs. Meso models (namely 4km NAM Nest and the NCEP HiRes WRFs)
depict most activity firing over the higher terrain Tue aftn,
though uncapped profiles are seen over the most of the Piedmont
as well. Hence a mentionable PoP extends throughout the area Tue,
with the best chances along the Blue Ridge once again. Very weak
shear will lead to discrete convection, producing mainly isolated
heavy rainfall and perhaps a few strong gusts.

&&

.SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY/...
As of 215 PM Monday: The remnant Bonnie circulation will lift slowly
northeast along the North Carolina coast Wednesday and Thursday.
Warm and humid air will remain in its wake across the western
Carolinas and northeast Georgia. Scattered, mainly diurnal
convection is expected Wednesday, with best coverage favoring the
mountains. Coverage increases on Thursday with the trend remaining
mainly diurnal and best coverage across the mountains. although
moderate instability is forecast both days, there is very little
shear. This along with moist vertical profiles should limit the
severe thunderstorm potential. However, he light steering flow up
the column will create a heavy rain threat with any thunderstorms
that form. Highs will be up to 5 degrees above normal with lows up
to 10 degrees above normal.

&&

.LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/...
As of 215 PM EDT Monday: the medium range fcst picks up at 00z on
Friday with upper ridging off to our east and a southern stream
upper low beginning to cut off over Texas. Over the next couple of
days, this low remains nearly stationary as steep upper ridging
builds over the Western CONUS. By the latter half of the weekend, a
broad upper trof begins to dig down over the Great Lakes as
impressive ridging persists to the west.

At the sfc, a weakly forced cold front will be moving into the CWFA
by early Friday as the remnants of Bonnie finally dissipate off the
NC Coast. The overall sfc pattern is expected to remain weakly
forced with the cold front stalling out over the region late Friday
and Sat. As we approach the end of the period another cold front
will likely develop and move thru the fcst area sometime late Sunday
into Monday with significant differences still apparent between the
long range models. As for the sensible fcst, no major changes were
needed with solid to low end likely chances for numerous showers and
ts each day/evening. Some drying is expected by the end of the
period early next week, however it is not clear exactly how quickly
that second front will move thru the area. Temps will start out just
above climatology and cool a few degrees on Sunday and Monday.

&&

.AVIATION /19Z MONDAY THROUGH SATURDAY/...
At KCLT: Enhanced moisture and convergence on the western periphery
of former Tropical Storm Bonnie will maintain a moderately dense
Cu field over the area thru sunset. A chance of SHRA/TSRA exists,
but operational impact is too unlikely to warrant a mention. Winds
will remain generally NE, in fact mostly NNE this aftn. Moist flow
from the Coastal Plain is expected to bring in IFR stratus cigs
early Tue AM. This will take until late morning to dissipate,
likely being replaced quickly by low VFR Cu similar to how cigs
evolved Mon mrng.

Elsewhere: Primary impacts for the aftn will be from TSRA, which
will develop near the Blue Ridge and propagate S and SE. TEMPOs are
included to cover the threat, except at KAND where the chance is
lower. Chances for impactful precip diminish by sunset, though a few
showers may linger over the I-77 corridor and vicinity (including
KHKY) thru much of tonight. The low stratus that is expected
to creep into the NC Piedmont early Tue mrng is not expected to
bring a cig even as far west as KHKY, though some other parts of
the area (namely KAVL/KAND) will see patchy fog near dawn. Winds
will prevail NE, except NW at KAVL due to valley effects.

Outlook: Bonnie's remnant low is expected to move very slowly
up the coastal Carolinas over the next several days, maintaining
increased precip and morning stratus chances at KCLT. Otherwise,
patchy fog chances continue at KAVL each morning, with scattered
afternoon/evening SHRA/TSRA increasing in coverage throughout
during the week.

Confidence Table...

            18-24Z        00-06Z        06-12Z        12-18Z
KCLT       High 100%     High 100%     High  90%     High  82%
KGSP       High 100%     High 100%     High 100%     High 100%
KAVL       High 100%     High 100%     High 100%     High  97%
KHKY       High 100%     High 100%     High  97%     High 100%
KGMU       High 100%     High 100%     High 100%     High 100%
KAND       High 100%     High 100%     High 100%     High  97%

The percentage reflects the number of guidance members agreeing
with the schedule TAF issuance flight rule category. Complete hourly
experimental aviation forecast consistency tables and ensemble forecasts
are available at the following link:

www.weather.gov/gsp/aviation

&&

.GSP WATCHES/WARNINGS/ADVISORIES...
GA...None.
NC...None.
SC...None.

&&

SYNOPSIS...JPT
NEAR TERM...Wimberley
SHORT TERM...RWH
LONG TERM...JPT
AVIATION...Wimberley
Hazardous weather outlook, May 30, 3:42 PM EDT, 36 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
342 PM EDT MON MAY 30 2016

GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065-
068>072-082-501>510-SCZ001>014-019-311945-
RABUN-HABERSHAM-STEPHENS-FRANKLIN-HART-ELBERT-AVERY-ALEXANDER-
IREDELL-DAVIE-MADISON-YANCEY-MITCHELL-SWAIN-HAYWOOD-BUNCOMBE-CATAWBA-
ROWAN-GRAHAM-NORTHERN JACKSON-MACON-SOUTHERN JACKSON-TRANSYLVANIA-
HENDERSON-CLEVELAND-LINCOLN-GASTON-MECKLENBURG-CABARRUS-UNION-
CALDWELL MOUNTAINS-GREATER CALDWELL-BURKE MOUNTAINS-GREATER BURKE-
MCDOWELL MOUNTAINS-EASTERN MCDOWELL-RUTHERFORD MOUNTAINS-
GREATER RUTHERFORD-POLK MOUNTAINS-EASTERN POLK-OCONEE MOUNTAINS-
PICKENS MOUNTAINS-GREENVILLE MOUNTAINS-GREATER OCONEE-
GREATER PICKENS-GREATER GREENVILLE-SPARTANBURG-CHEROKEE-YORK-
ANDERSON-ABBEVILLE-LAURENS-CHESTER-GREENWOOD-
342 PM EDT MON MAY 30 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST GEORGIA...PIEDMONT
NORTH CAROLINA...WESTERN NORTH CAROLINA AND UPSTATE SOUTH CAROLINA.

.DAY ONE...TONIGHT.

SCATTERED THUNDERSTORMS WILL CONTINUE ACROSS THE REGION INTO THE
EVENING. THE MAIN HAZARDS WITH ANY THUNDERSTORMS THAT DEVELOP WILL
BE CLOUD TO GROUND LIGHTNING STRIKES AND GUSTY WINDS. THE
THUNDERSTORMS WILL ALSO BE SLOW MOVING AND LOCALLY HEAVY RAINFALL
COULD POSE A THREAT OF ISOLATED FLOODING OF LOW LYING AREAS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

..TUESDAY...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
..WEDNESDAY...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
..THURSDAY...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
..FRIDAY...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
..SATURDAY...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
..SUNDAY...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

NONE.

The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 30, 4:21 PM EDTSpecial Weather StatementGSPPickens39 min
May 30, 5:00 PM EDTSpecial Weather StatementGSPAnderson45 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2016Every severe thunderstorm warning in 2016

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.