Alert archive / North Carolina / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 247, NWS Greenville-Spartanburg, SC

July 20, 2013Alexander County, Caldwell County, Catawba County, North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Jul 20, 2013, 12:57 PM EDT for Alexander County, Caldwell County, Catawba County, North Carolina. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 20, 2013, 12:57 PM EDT (16:57 UTC)
Expired: Jul 20, 2013, 2:00 PM EDT
In force: 63 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon

Counties Alexander County, NC, Caldwell County, NC, Catawba County, NC

The radar

The Greer radar (KGSP), 135 km from the middle of the area, began a volume at 16:57 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 5.0 hours before the alert went out and 130 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: 1715 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 563 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Jul 20, 10:04 AM EDT, 2 hours 53 minutes earlier.

Area forecast discussion, Jul 20, 10:04 AM EDT, 2 hours 53 minutes before

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Hazardous weather outlook, Jul 20, 4:59 AM EDT, 7 hours 58 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
459 AM EDT SAT JUL 20 2013

GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065-
068>072-082-501>510-SCZ001>014-019-210900-
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 NC-
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-UNION SC-CHESTER-GREENWOOD-
459 AM EDT SAT JUL 20 2013

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

.DAY ONE...TODAY AND TONIGHT.

SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS THE REGION
THIS AFTERNOON AND EVENING. A FEW OF THESE STORMS MAY BECOME
SEVERE...PRODUCING HAIL AS LARGE AS QUARTERS...AND BRIEF BUT
DAMAGING WIND GUSTS. IN ADDITION...ANY THUNDERSTORMS THAT FORM
TODAY WILL MOVE SLOWLY. THE RESULTING HEAVY RAINFALL COULD PRODUCE
ISOLATED FLASH FLOODING...ESPECIALLY IN ANY LOCATIONS REPEATEDLY
AFFECTED BY THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTERS ARE REQUESTED TO FORWARD ANY REPORTS OF LARGE
HAIL...DAMAGING WINDS...OR FLASH FLOODING TO OUR OFFICE.

HG

In the hours before

Special weather statement, Jul 20, 11:54 AM EDT, 1 hour 3 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1154 AM EDT SAT JUL 20 2013

NCZ033-050-501>506-201630-
AVERY-BURKE MOUNTAINS-CALDWELL MOUNTAINS-EASTERN MCDOWELL-GREATER
BURKE-GREATER CALDWELL-MCDOWELL MOUNTAINS-MITCHELL-
1154 AM EDT SAT JUL 20 2013

...THUNDERSTORMS THAT HAVE DEVELOPED ALONG THE BLUE RIDGE ESCARPMENT
WILL AFFECT CALDWELL...EASTERN AVERY...NORTHERN BURKE...NORTHERN
MCDOWELL AND SOUTHEASTERN MITCHELL COUNTIES THROUGH 1230 PM EDT...

PEA SIZE HAIL...AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS
STORM.  LOCALLY HEAVY RAIN CAN CAUSE WATER LEVELS TO RISE IN
CREEKS... STREAMS... AND POOR DRAINAGE AREAS.

BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS DURING THE
AFTERNOON.

LAT...LON 3616 8182 3612 8181 3613 8166 3607 8141
      3602 8133 3575 8140 3563 8228 3617 8184

LGL

Special weather statement, Jul 20, 12:31 PM EDT, 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1231 PM EDT SAT JUL 20 2013

NCZ048-052-053-059-063>065-SCZ003-201730-
BUNCOMBE-GREENVILLE MOUNTAINS-HAYWOOD-HENDERSON-MADISON-NORTHERN
JACKSON-SOUTHERN JACKSON-TRANSYLVANIA-
1231 PM EDT SAT JUL 20 2013

...SCATTERED THUNDERSTORMS WILL AFFECT EASTERN JACKSON...
HAYWOOD...HENDERSON...MADISON...NORTHWESTERN GREENVILLE...
TRANSYLVANIA... AND WESTERN BUNCOMBE COUNTIES THROUGH 130 PM EDT...

AT 1230 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
NUMEROUS SHOWERS AND THUNDERSTORMS... SOME PRODUCING HEAVY RAIN...
OVER THE HIGHER TERRAIN WEST OF THE ASHEVILLE AND HENDERSONVILLE
AREA. THE STORMS WERE MOVING SLOWLY TO THE EAST.

THE STORMS WILL AFFECT LOCATIONS NEAR...
  ASHEVILLE...
  WAYNESVILLE...
  CANTON...
  BREVARD...
  HENDERSONVILLE...

PEA SIZE HAIL...WIND GUSTS UP TO 40 MPH... AND LIGHTNING ARE
EXPECTED WITH THE STORMS. LOCALLY HEAVY RAIN CAN CAUSE RAPID RISES
OF WATER LEVELS IN CREEKS... STREAMS... AND POOR DRAINAGE AREAS.

BE ALERT FOR RAPIDLY CHANGING WEATHER THIS AFTERNOON.

LAT...LON 3594 8257 3526 8234 3519 8236 3519 8234
      3500 8311 3575 8309

LGL

Special weather statement, Jul 20, 12:38 PM EDT, 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1238 PM EDT SAT JUL 20 2013

NCZ033-049-050-501>506-201730-
AVERY-BURKE MOUNTAINS-CALDWELL MOUNTAINS-EASTERN MCDOWELL-GREATER
BURKE-GREATER CALDWELL-MCDOWELL MOUNTAINS-MITCHELL-YANCEY-
1238 PM EDT SAT JUL 20 2013

...THUNDERSTORMS WILL AFFECT AVERY...BURKE...CALDWELL...MCDOWELL...
MITCHELL AND YANCEY COUNTIES THROUGH 130 PM EDT...

AT 1235 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
NUMEROUS SHOWERS AND SCATTERED THUNDERSTORMS EXTENDING FROM YANCEY
AND MITCHELL COUNTIES EAST ACROSS THE BLUE RIDGE ESCARPMENT INTO THE
FOOTHILLS.  THE SHOWERS AND THUNDERSTORMS WERE MOVING SLOWLY TO THE
EAST.

PEA SIZE HAIL... WIND GUSTS UP TO 40 MPH... AND LIGHTNING ARE
EXPECTED WITH THE STORMS. VERY HEAVY RAIN WILL CAUSE STREAMS AND
POOR DRAINAGE AREAS TO HAVE HIGH WATER LEVELS.

BE ALERT FOR RAPIDLY CHANGING THUNDERSTORM WEATHER DURING THE
REMAINDER OF THE AFTERNOON.

LAT...LON 3611 8212 3615 8203 3612 8181 3611 8153
      3607 8141 3583 8134 3557 8158 3557 8168
      3561 8175 3557 8184 3557 8218 3569 8229
      3571 8228 3575 8234 3580 8234 3582 8240
      3593 8250 3616 8222 3615 8215

LGL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 11:26 AM EDT	Areal Flood Advisory	GSP	Avery	2 hr
Jul 20, 11:48 AM EDT	Areal Flood Advisory	GSP	Caldwell	2 hr
Jul 20, 11:54 AM EDT	Special Weather Statement	GSP	Burke, Caldwell, McDowell	36 min
Jul 20, 12:31 PM EDT	Special Weather Statement	GSP	Buncombe, Haywood, Henderson, Madison, Transylvania	59 min
Jul 20, 12:38 PM EDT	Special Weather Statement	GSP	Avery, Burke, Caldwell, McDowell, Mitchell, Yancey	52 min
Jul 20, 12:53 PM EDT	Severe Thunderstorm Warning	GSP	Burke, Caldwell	67 min
Jul 20, 1:48 PM EDT	Special Weather Statement	GSP	Davie	42 min
Jul 20, 1:55 PM EDT	Severe Thunderstorm Warning	GSP	McDowell, Polk, Rutherford	50 min
Jul 20, 2:03 PM EDT	Severe Thunderstorm Warning	GSP	Jackson	57 min
Jul 20, 2:14 PM EDT	Severe Thunderstorm Warning	GSP	Burke, McDowell	61 min
Jul 20, 2:46 PM EDT	Areal Flood Advisory	GSP	Davie, Iredell, Rowan	104 min
Jul 20, 2:59 PM EDT	Areal Flood Advisory	GSP	Burke, Cleveland, McDowell, Rutherford	2 hr
Jul 20, 3:04 PM EDT	Severe Thunderstorm Warning	GSP	Polk	56 min
Jul 20, 3:13 PM EDT	Areal Flood Advisory	GSP	Polk	107 min
Jul 20, 3:48 PM EDT	Flash Flood Warning	GSP	Polk	3 hr
Jul 20, 4:10 PM EDT	Areal Flood Advisory	GSP	Cleveland, Polk, Rutherford	110 min
Jul 20, 5:28 PM EDT	Areal Flood Advisory	GSP	Catawba, Iredell, Lincoln, Mecklenburg	2 hr
Jul 20, 6:00 PM EDT	Special Weather Statement	GSP	Madison	45 min
Jul 20, 6:11 PM EDT	Special Weather Statement	GSP	Rowan	49 min
Jul 20, 6:14 PM EDT	Areal Flood Advisory	GSP	Graham, Swain	106 min
Jul 20, 6:46 PM EDT	Areal Flood Advisory	GSP	Swain	2 hr
Jul 20, 3:20 PM EDT	Special Weather Statement	GSP	Greenville, Pickens	40 min
Jul 20, 4:57 PM EDT	Areal Flood Advisory	GSP	Anderson, Oconee, Pickens	2 hr
Jul 20, 5:24 PM EDT	Areal Flood Advisory	GSP	Anderson, Greenville, Pickens, Spartanburg	2 hr
Jul 20, 6:33 PM EDT	Areal Flood Advisory	GSP	Anderson	117 min
Jul 20, 6:05 PM EDT	Special Weather Statement	GSP	Elbert	40 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2013 Every severe thunderstorm warning in 2013

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.