Alert archive / North Carolina / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 53, NWS Greenville-Spartanburg, SC
NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at May 11, 2007, 3:23 PM EDT for Macon County, North Carolina. It was in force for 31 min. 1 report 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 11, 2007, 3:23 PM EDT (19:23 UTC)
- Expired
- May 11, 2007, 3:54 PM EDT
- In force
- 31 min
- Issued by
- NWS Greenville-Spartanburg, SC
- Area
- Counties, with a storm outline in the text
County Macon County, NC
The radar
The Greer radar (KGSP), 92 km from the middle of the area, began a volume at 19:23 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 |
|---|---|---|---|
| May 11, 3:42 PM EDT | HAIL 0.75 | Highlands, NC | MACON COUNTY DISPATCH REPORTED PENNY SIZED HAIL OCCURRED IN HIGHLANDS. HIGH WIND ALSO REPORTED BUT NO SPECIFICS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
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, 7.4 hours before the alert went out and 223 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1410 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS52 KGSP 111924 SVRGSP NCC113-112030- /O.NEW.KGSP.SV.W.0053.070511T1923Z-070511T2030Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 323 PM EDT FRI MAY 11 2007 THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN MACON COUNTY IN WESTERN NORTH CAROLINA * UNTIL 430 PM EDT * AT 319 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 3 MILES NORTH OF HIGHLANDS...OR ABOUT 12 MILES SOUTHEAST OF FRANKLIN...AND WAS MOVING SOUTH AT 10 MPH. * THE SEVERE THUNDERSTORM WILL AFFECT HIGHLANDS BY 335 PM EDT. PEOPLE IN THE PATH OF THIS SEVERE THUNDERSTORM SHOULD BE ALERT FOR LARGE HAIL AND DAMAGING WINDS. FREQUENT LIGHTNING AND LOCALLY HEAVY RAIN CAN OCCUR WITH ANY THUNDERSTORM. SEEK SHELTER INDOORS AWAY FROM WINDOWS AND DOORS UNTIL THE STORM PASSES. TO REPORT DAMAGING WINDS...LARGE HAIL...OR FLOODING...THROUGH OUR AUTOMATED REPORTING SYSTEM...CALL OUR TOLL FREE NUMBER... 1 8 7 7...6 3 3...6 7 7 2. LAT...LON 3511 8317 3513 8322 3500 8331 3500 8315 $$ LANE
2 follow-up statements
000 WWUS52 KGSP 111946 SVSGSP SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 344 PM EDT FRI MAY 11 2007 NCC113-112030- /O.CON.KGSP.SV.W.0053.000000T0000Z-070511T2030Z/ MACON NC- 344 PM EDT FRI MAY 11 2007 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR SOUTHEASTERN MACON COUNTY... AT 340 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAD WEAKENED. HOWEVER...THE STORM REMAINS CAPABLE OF PRODUCING BRIEF PERIODS OF DAMAGING WINDS IN EXCESS OF 60 MPH IN THE HIGHLANDS AREA. THIS SEVERE THUNDERSTORM WARNING IS IN EFFECT BECAUSE BRIEF PERIODS OF DAMAGING WINDS ARE EXPECTED OVER SMALL AREAS. THIS STORM WAS ALSO CAUSING INTENSE LIGHTNING AND TORRENTIAL RAINFALL. SEEK SHELTER INDOORS UNTIL THE STORM PASSES. LAT...LON 3511 8317 3513 8322 3500 8331 3500 8315 $$ LANE
000 WWUS52 KGSP 111954 SVSGSP SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 352 PM EDT FRI MAY 11 2007 NCC113-112002- /O.CAN.KGSP.SV.W.0053.000000T0000Z-070511T2030Z/ MACON NC- 352 PM EDT FRI MAY 11 2007 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MACON COUNTY IS CANCELLED... THE STORM HAS WEAKENED BELOW SEVERE LEVELS. RAIN SHOWERS WILL CONTINUE TO PRODUCE HEAVY RAIN IN THE HIGHLANDS AREA THROUGH ABOUT 430 PM. HOWEVER...THE THREAT FOR SEVERE WEATHER HAS PASSED. LAT...LON 3511 8317 3513 8322 3500 8331 3500 8315 $$ LANE
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 11, 2:39 PM EDT, 44 minutes earlier.
Area forecast discussion, May 11, 2:39 PM EDT, 44 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 239 PM EDT FRI MAY 11 2007 .SYNOPSIS... A WARM AND UNSTABLE AIRMASS WILL LINGER ACROSS THE WESTERN CAROLINAS AND NORTHEAST GEORGIA OUT AHEAD OF A SOUTHWARD SINKING COLD FRONT THROUGH SATURDAY. DRIER HIGH PRESSURE WILL THEN BE IN CONTROL OF OUR WEATHER SUNDAY AND INTO THE FIRST HALF OF THE UPCOMING WEEK. && .NEAR TERM /THROUGH SATURDAY/... AXIS OF INSTABILITY WITH CAPES FROM 500-1000J CURRENTLY LOCATED FROM NE GEORGIA THROUGH WESTERN NC. RADAR CURRENTLY SHOWS ISOLATED TO SCATTERED THUNDERSTORMS. BOTH NAM AND GFS DEVELOP CONVECTION IN THE THIS AREA AND THEN MOVE IT SE OFF THE ESCARPMENT INTO THE FOOTHILLS AND PIEDMONT LATE THIS AFTERNOON AND EVENING WHICH LOOKS REASONABLE. THEREFORE...WILL FEATURE SCATTERED THUNDERSTORMS IN THE MOUNTAINS EARLY ON...TRENDING THE HIGHER POPS INTO THE FOOTHILLS AND PIEDMONT THIS EVENING. EXPECT CONVECTION TO EITHER DISSIPATE OR MOVE OUT OF THE FORECAST AREA BY MIDNIGHT. EXPECT AREAS OF DENSE VALLEY FOG TO DEVELOP AGAIN AFTER MIDNIGHT IN THE MOUNTAINS. A BLEND OF MOS NUMBERS LOOKS GOOD FOR OVERNIGHT LOWS. ON SATURDAY...THE SYNOPTIC WEATHER WILL FEATURE A BACKDOOR COLD FRONT MOVING S ACROSS THE AREA. THE DETAILS CONCERNING TIMING OF FRONT AND THE LOCATION OF THE MOST SIGNIFICANT CONVECTION IS STILL SOMEWAHT UNCERTAIN. NAM IS SOMEWHAT SLOWER THAN THE GFS IN MOVING THE FRONT THROUGH WHICH ALLOWS MORE OF THE AREA TO DESTABALIZE AND CONSEQUENTLY MORE WIDESPREAD COVERAGE WITH THE CONVECTION. GFS QUICKER WITH THE BOUNDARY AND POOLS THE HIGHEST INSTABILITY THROUGH THE PIEDMONTS. THUS...BEST CHANCES FOR WIDESPREAD CONVECTION USING THE GFS WOULD BE OVER THE SOUTHERN PORTION OF THE FORECAST AREA WITH MINIMAL CHANCES ELSEWHERE. BEST COURSE AT THE MOMENT WOULD SEEM TO BE TAKING A COMPROMISE OF THE SOLUTIONS WHICH WOULD GIVE MOST OF THE FORECAST AREA A HEALTHY CHANCE FOR SHOWERS AND THUINDERSTORMS WITH THE HIGHEST POPS THROUGH THE PIEDMONTS IN THE AFTERNOON. POP GRID FOR SAT AFTERNOON WILL SHOW LIKELY POPS IN THE PIEDMONTS SCALED BACK TO LOW CHANCE ACROSS THE NC MOUNTAINS. FRONT WILL HAVE SOME UPPER SUPPORT IN THE FORM OF WEAK DIFFLUENCE ALOFT AND AN UPPER SHORT WAVE. HOWEVER...WIND FIELDS WEAK SO THREAT OF SEVERE WILL BE IN THE ISOLATED RANGE AT BEST. USED A MOS BLEND AGAIN FOR HIGH TEMPERATURES ON SAT AS MAV NUMMBERS LOOK TO BE A CATEGORY TOO HIGH. && .SHORT TERM /SATURDAY NIGHT THROUGH MONDAY NIGHT/... CONVECTION WILL DIMINISH WITH COOLING SAT NIGHT AND IS EXPECTED TO PUSH S OF CWA WITH SURFACE BOUNDARY EARLY SUN MORNING. TEMPS WILL BE COOLER SUN AS HIGH PRESSURE BUILDS IN FROM THE N AND A COUPLE MORE DEGREES COOLER MON...DOWN CLOSER TO AVG...AS COOL...DRY HIGH PRESSURE SETTLES OVER THE REGION FOR THE BEGINNING OF THE WEEK. && .LONG TERM /TUESDAY THROUGH FRIDAY/... HPC FCST LEANS TOWARD GFS TUE...THEN MORE TOWARD ECMWF WED-FRI. HI PRESSURE MOVES OFF THE E COAST TUE WHICH PUTS AREA IN S FLOW. THIS SHOULD BRING INCREASING MOISTURE BACK OVER THE AREA LATE IN THE DAY...MAINLY OVER W CWA. WENT WITH DRY FCST TUE...THEN BROUGHT SLIGHT CHANCE POPS OVER MTNS TUE NIGHT. OFFSHORE HIGH MOVES FARTHER SE WED WHICH INCREASES WARM...MOIST S FLOW OVER REGION... AND A COLD FRONT IS STILL FCST TO MOVE IN FROM THE NW WED. THERE IS A BETTER UPPER SUPPORT WITH A WEAK SHORTWAVE PASSING JUST N OF AREA...SO HAVE SOLID CHANCE POPS OVER MTNS WED...TAPERING TO SLIGHT CHANCE OVER SE CWA...WITH CHANCE POPS MOVING WITH FRONT ACROSS CWA FROM NW TO SE WED NIGHT BEFORE DWINDLING TO SLIGHT CHANCE ON THU AS FRONT TRACKS SE OF AREA. COOLER HIGH PRESSURE BUILDS IN FROM THE N FOR THE END OF THE WEEK. && .AVIATION /19Z FRIDAY THROUGH WEDNESDAY/... MAIN CONCERNS FOR AVIATION WILL BE POTENTIAL FOR CONVECTION TO AFFECT AIR FIELDS MID TO LATE AFTERNOON TODAY AND AGAIN AFTER 16Z ON SATURDAY. AXIS OF INSTABILITY LOCATED OVER THE NC MOUNTAIONS THIS AFTERNOON HAS ALREADY SUPPORTED SOME ISOLATED THUNDERSTORM DEVELOPMENT. BOTH NAM AND GFS DEVELOP CONVECTION OVER MOUNTAINS DURING THE AFTERNOON AND THEN MOVE IT SE INTO THE FOOTHILLS AND PIEDMONT LATE THIS AFTERNOON/EVENING. THEREFORE...WILL CARRY A VCTS ALL TAF SITES. EXPECT CONVECTION TO DIMINISH OR MOVE OUT OF THE FORECAST AREA AFTER 00Z. OVERNIGHT VFR CONDITIONS EXPECTED INTIALLY...BUT HAVE PLAYED PERSISTENCE AT KAVL BRINGING LIFR FOG CONDITIONS INTO THE AIR FIELD BY 06Z AND HOLDING ON TO THAT TIL ABOUT 11Z. OTHER AIRPORTS SHOULD BE VFR EXCEPT FOR A COUPLE HOURS OF MVFR FOG 10Z-12Z. VFR CONDITIONS EXPECTED AFTER 12Z SAT WITH CEILINGS DEVELOPING AROUND 4000 FT BY 16Z. MENTIONED VCTS AT 16Z ALL AIR FIELDS EXCEPT KAVL AND KHKY WHERE MODELS INDIDCATE PROBABLILITY OF PRECIPIATION THE LEAST ON SAT. FOR THE EXTENDED PERIOD...BACKDOOR COLD FRONT THAT IS EXPECTED TO TRIGGER THE THUNDERSTORMS ON SAT WIL MOVE SOUTH OF THE REGION BY SUNDAY MORNING ALLOWING HIGH PRESSURE TO BUILD SOUTH. VFR CONDTIONS EXPECTED SUN INTO WED. SHOWERS AND THUNDERSTORMS ARE EXPECTED WED AFTERNOON ASSOCIATED WITH A COLD FRONT. AREAS MVFR/IFR CEILINGS AND VISIBILITIES MAY OCCUR WITH THE SHOWERS AND STORMS. && .GSP WATCHES/WARNINGS/ADVISORIES... GA...NONE. NC...NONE. SC...NONE. && SYNOPSIS...DEO NEAR TERM...LG SHORT TERM...RB LONG TERM...RB AVIATION...LG
Hazardous weather outlook, May 11, 6:09 AM EDT, 9 hours 14 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 609 AM EDT FRI MAY 11 2007 GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065- 068>072-082-501>510-SCZ001>014-019-121015- 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- 609 AM EDT FRI MAY 11 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST GEORGIA...PIEDMONT NORTH CAROLINA...WESTERN NORTH CAROLINA AND UPSTATE SOUTH CAROLINA. .DAY ONE...TODAY AND TONIGHT A CHANCE OF THUNDERSTORMS WILL BE SEEN THIS AFTERNOON AND EVENING. THERE IS A SLIGHT CHANCE THAT STORMS WILL PRODUCE GUSTY WIND OR HAIL. SLOW-MOVING STORMS HAVE THE POTENTIAL FOR LOCALLY HEAVY RAIN. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY SCATTERED...IF NOT WIDESPREAD THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG A COLD FRONT MOVING THROUGH THE REGION ON SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
In the hours before
Special weather statement, May 11, 2:08 PM EDT, 1 hour 15 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 208 PM EDT FRI MAY 11 2007 GAZ010-017-111845- HABERSHAM-RABUN- 208 PM EDT FRI MAY 11 2007 ...A STRONG THUNDERSTORM WILL AFFECT HABERSHAM AND RABUN COUNTIES THROUGH 300 PM EDT... AT 208 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR CLAYTON...MOVING SOUTHWEST AT 20 MPH. THIS STORM WILL BE NEAR... LAKE RABUN BY 215 PM EDT. NACOOHE LAKE BY 220 PM EDT. BATESVILLE BY 240 PM EDT. PEA SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM. RB
Special weather statement, May 11, 2:48 PM EDT, 35 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 248 PM EDT FRI MAY 11 2007 SCZ001-111945- OCONEE MOUNTAINS- 248 PM EDT FRI MAY 11 2007 ...A STRONG THUNDERSTORM WILL AFFECT NORTHERN OCONEE COUNTY THROUGH 345 PM EDT... AT 241 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 13 MILES NORTH OF WALHALLA...MOVING EAST AT 5 MPH. THIS STORM WILL BE NEAR... SALEM BY 325 PM EDT. LAKE JOCASSEE AND NORTHERN LAKE KEOWEE BY 340 PM EDT. PEA SIZE HAIL...WIND GUSTS OF 30 TO 40 MPH...AND FREQUENT CLOUD TO GROUND LIGHTNING ARE EXPECTED WITH THIS STORM. LANE
Special weather statement, May 11, 3:09 PM EDT, 14 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 309 PM EDT FRI MAY 11 2007 NCZ035-112000- ALEXANDER- 309 PM EDT FRI MAY 11 2007 ...A STRONG THUNDERSTORM WILL AFFECT ALEXANDER COUNTY THROUGH 400 PM EDT... AT 307 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR TAYLORSVILLE...MOVING EAST AT 10 MPH. THIS STORM WILL BE NEAR... HIDDENITE BY 325 PM EDT. STONY POINT BY 335 PM EDT. THIS STORM IS CAPABLE OF PRODUCING PEA SIZE HAIL...AND WIND GUSTS OF 40 TO 50 MPH FROM TAYLORSVILLE TO HIDDENITE. TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM. FLOODING OF AREAS WITH POOR DRAINAGE...PARTICULARLY AREAS THAT ARE PRONE TO FLOODING CAN BE EXPECTED IN URBAN AREAS AROUND TAYLORSVILLE. LANE
Special weather statement, May 11, 3:21 PM EDT, 2 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 321 PM EDT FRI MAY 11 2007 NCZ062-112000- MACON- 321 PM EDT FRI MAY 11 2007 ...A STRONG THUNDERSTORM WILL AFFECT EASTERN MACON COUNTY THROUGH 400 PM EDT... AT 319 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM ABOUT 3 MILES NORTH OF HIGHLANDS...OR 12 MILES SOUTHEAST OF FRANKLIN...MOVING SOUTH AT 10 MPH. THIS STORM WILL BE NEAR... HIGHLANDS BY 330 PM EDT. MOTHBALL SIZE HAIL...AND WIND GUSTS OF 40 TO 50 MPH ARE EXPECTED WITH THIS STORM AS IT APPROACHES HIGHLANDS. LANE
The office that day
Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 4:01 PM EDT | Severe Thunderstorm Warning | GSP | Transylvania | 59 min |
| May 11, 4:24 PM EDT | Severe Thunderstorm Warning | GSP | Henderson | 33 min |
Nearby
Severe Thunderstorm Warnings in North Carolina, 2007Every severe thunderstorm warning in 2007
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.