Alert archive / North Carolina / Special Weather Statements in 2012

Special Weather Statement, NWS Greenville-Spartanburg, SC

August 11, 2012Avery County, Mitchell County, North Carolina

NWS Greenville-Spartanburg, SC issued this special weather statement at Aug 11, 2012, 4:29 AM EDT for Avery County, Mitchell County, North Carolina. It was in force for 46 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 11, 2012, 4:29 AM EDT (08:29 UTC)
Expired: Aug 11, 2012, 5:15 AM EDT
In force: 46 min
Issued by: NWS Greenville-Spartanburg, SC

Counties Avery County, NC, Mitchell County, NC

The radar

The Knoxville radar (KMRX), 127 km from the middle of the area, began a volume at 08:30 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 00:00Z, 8.5 hours before the alert went out and 189 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: 781 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 955 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this special weather statement went out at Aug 11, 3:47 AM EDT, 42 minutes earlier.

Area forecast discussion, Aug 11, 3:47 AM EDT, 42 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
347 AM EDT SAT AUG 11 2012

.SYNOPSIS...
A COLD FRONT WILL SLOWLY CROSS THE ARE TODAY...AND THEN MOVE OUT OF
THE AREA ON SUNDAY. HIGH PRESSURE WILL ARRIVE EARLY NEXT WEEK.
ANOTHER FRONT WILL APPROACH THE AREA BY MID WEEK.

&&

.NEAR TERM /THROUGH TONIGHT/...
AS OF 340 AM EDT SATURDAY...ONGOING PREFRONTAL FORCING HAS KEPT
THINGS ACTIVE ACROSS THE ERN HALF OF THE CWFA THIS MORNING. DON/T
ANTICIPATE ANY REAL STRONG STORMS OR FLOODING ISSUES SINCE THE CELLS
ARE MOVING ALONG AT A NE/LY NICE CLIP AND THE LLVL THERMAL FIELDS
HAVE BEEN WORKED OVER ALONG THE I85 CORRIDOR. HOWEVER...WITH A
HIGHLY SATURATED COLUMN AND A HIGH RUNOFF POTENTIAL...ANY STORMS
THAT BACK BUILD OR MERGE COULD PRESENT A HYDRO ISSUE...ESP ACROSS
NRN GVILLE CO WHERE ANOTHER INCH OF RAIN HAS FALLEN EARLY THIS
MORNING.

THERE IS GOOD AGREEMENT WITH THE OP MODELS IN FINALLY PUSHING THE TN
COLD FRONT THROUGH THE AREA THIS AFTERNOON AND EAST OF THE CWFA BY
06Z SUN. MADE LITTLE CHANGES TO THE GOING POPS AND THINK THE BEST
COVERAGE WILL BE EAST OF THE MTNS TDAY. THE MTNS SHOULD BE CLEARING
OFF BY MID AFTERNOON WITH DEEP DRY AIR MIXING IN AND SFC RIDGING
BUILDING EAST AFT 18Z. THIS LEAVES THE BEST INSTABILITY AND UPPER
FORCING ACROSS THE PIEDMONT/FHILLS THIS AFTERNOON. THE SBCAPE FIELDS
ARE A BIT SUSPECT WITH ALL THE DEBRIS CLOUDINESS AND WEAK MLVL LAPSE
RATES. YET...DEEP SHEAR WILL INCREASE THROUGH THE AFTERNOON ABOVE
H85 TO AROUND 35 KTS. ALSO...CROSS SECTIONS SHOW A NICE INFLUX OF
LOW MLVL THETA/E AIR...WHICH COULD ENHANCE A STRONG/SEVERE WIND
THREAT. DON/T ENVISION GREAT ORGANIZATION WITH THESE STORMS...BUT
ISOL TO SCT SEVERE MULITCELLS PRODUCING DAMAGING OUTFLOWS ARE
PROBABLE. THE BULK OF ACTIVITY SHOULD BE EAST OF I77 SHORTLY AFT
00Z...WITH INCREASING DRY AND STABLE AIR WORKING IN THROUGH THE
OVERNIGHT. MAX TEMPS REMAINING A LITTLE BELOW NORMAL WITH ALL THE
CLOUD COVER...MINS BELOW NORMAL AS WELL WITH AN AIRMASS MIX AND
LIMITED CLOUD COVER.

&&

.SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/...
AT 230 AM EDT SATURDAY...AN UPPER LOW WILL MOVE NORTHEAST ACROSS
QUEBEC ON SUNDAY...WHILE A SHORTWAVE TO ITS SOUTH MOVES FROM THE
APPALACHIANS TO THE COAST. ON MONDAY ANOTHER SHORTWAVE DROPS INTO
THE MEAN UPPER TROUGH AXIS WEST OF THE THE MOUNTAINS...REACHING THE
BASE OF THE TROUGH ON MONDAY NIGHT. AT THE SURFACE...DRY HIGH
PRESSURE WILL MOVE OVER OUR AREA ON SUNDAY AND SUNDAY NIGHT AS A
COLD FRONT DEPARTS TO THE EAST. MOISTURE INCREASES OVER THE
MOUNTAINS ON MONDAY...AS ANOTHER COLD FRONT MOVES INTO THE MS RIVER
VALLEY. AS THE FRONT MOVES ACROSS THE OH AND TN VALLEY MONDAY
NIGHT...MOISTURE SPREADS ACROSS THE REST OF OUR AREA. POPS WILL BE
RAISED MONDAY AND MONDAY NIGHT WITH THE APPROACH OF THE NEXT SYSTEM.
TEMPERATURES WILL RISE FROM SLIGHTLY BELOW NORMAL TO NEAR NORMAL.

&&

.LONG TERM /TUESDAY THROUGH FRIDAY/...
AT 230 AM EDT SATURDAY...A MEAN UPPER TROUGH AXIS WILL BE LOCATED
FROM THE GREAT LAKES TO THE OH AND TN RIVER VALLEYS FROM TUESDAY
THROUGH FRIDAY. A COLD FRONT WILL APPROACH THE APPALACHIANS ON
TUESDAY...CROSSING THE MOUNTAINS TUESDAY NIGHT...THEN BECOMING
STATIONARY NEAR THE BORDER OF NC AND SC BY THURSDAY. THE FRONT
WEAKENS ON FRIDAY...WHILE ANOTHER FRONT CROSSES APPROACHES THE
MOUNTAINS FROM THE WEST. POPS WILL BE FLUCTUATE AS BOUNDARIES
WARRANT. TEMPERATURES WILL BE NEAR NORMAL.

&&

.AVIATION /08Z SATURDAY THROUGH WEDNESDAY/...
AT KCLT...KEEPING AN EYE ON THE CONVECTION UPSTREAM OF THE TERMINAL.
COULD NEED AN AWW FOR CTG LTG...BUT NOT EXPECTING SIGFNT WIND SHIFTS
OR CIG/VSBY ISSUES WITH THAT STORM. THE OVERALL PREFRONTAL ZONE IS
FAIRLY WEAK...BUT IT WILL SHIFT EAST THROUGH THE MORNING...LIKELY
CREATING A LOWERING OF CIGS TO IFR BY DAYBREAK. BRING MVFR BY
14Z...SIMILAR TO YDAY/S MORNING AIRMASS TRANSITION. THUNDER CLOSE BY
AGAIN THIS AFTERNOON...MOVING EAST OF THE TERMINAL BY 00Z PER THE
WRF ARW.

ELSEWHERE...SHOWERS AND THUNDER TO AFFECT THE SC TERMINALS OVER THE
NEXT FEW HRS. HAVE CIGS LOWERING AT ALL SITES TO MVFR/IFR AFT
09Z...SOME OF WHICH HAVE ALREADY FALLEN DUE TO RECENT PRECIP. A
LITTLE MORE DRYING AT KAVL AND KHKY COULD ALLOW FOR IFR VSBY BY
DAYBREAK. SHOWERS AND THUNDER WILL BE ISOL THIS AFTERNOON AND THE
MAIN LINE SHOULD BE EAST OF ALL SITES...HOWEVER CANNOT RULE OUT
UPPER TROF INDUCING CONVECTION IN BETTER INSOLATION AREA POST
FROPA...SO KEPT PROB30 TS AT ALL SITES EXCEPT KAVL.

OUTLOOK...A COLD FRONT WILL SLOWLY CROSS THE AREA LATE SATURDAY...
WITH DRIER HIGH PRES BUILDING IN FROM THE W THE LATTER HALF OF THE
WEEKEND. WEAK HIGH PRESSURE WILL LINGER THROUGH EARLY NEXT WEEK.

AN EXPERIMENTAL AVIATION FORECAST CONSISTENCY TABLE SHOWING THE
PERCENTAGE OF GUIDANCE MEMBERS AGREEING WITH THE SCHEDULED ISSUANCE
CATEGORY IS AVAILABLE AT FOLLOWING LINK (USE LOWER CASE)...

WWW.WEATHER.GOV/GSP/AVIATION/TABLES.HTM

&&

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

&&

SYNOPSIS...JAT
NEAR TERM...SBK
SHORT TERM...JAT
LONG TERM...JAT
AVIATION...SBK

Hazardous weather outlook, Aug 11, 4:09 AM EDT, 20 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
409 AM EDT SAT AUG 11 2012

GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065-
068>072-082-501>510-SCZ001>014-019-121000-
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-
409 AM EDT SAT AUG 11 2012

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

.DAY ONE...TODAY AND TONIGHT.

THUNDERSTORMS ARE IN THE FORECAST TODAY AND THIS EVENING. SOME OF
THESE THUNDERSTORMS MAY BECOME SEVERE...ESPECIALLY EAST OF THE
MOUNTAINS. DAMAGING WINDS WILL BE THE MAIN HAZARD...ALTHOUGH LARGE
HAIL IS ALSO POSSIBLE. ANY OF THESE THUNDERSTORMS WILL BE CAPABLE
OF PRODUCING CLOUD TO GROUND LIGHTNING AND HEAVY RAINFALL.
ISOLATED FLOODING WILL BE POSSIBLE WHERE RECENT RAINFALL HAS
SATURATED THE GROUND.

.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...TORNADOES OR FLASH FLOODING TO OUR OFFICE.

07

In the hours before

Local storm report, Aug 10, 11:59 PM EDT, 4 hours 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1159 PM EDT FRI AUG 10 2012

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

1120 PM     TSTM WND DMG     4 N EASLEY              34.88N 82.60W
08/10/2012                   PICKENS            SC   LAW ENFORCEMENT

            TREE BLOCKING CANNERY ROAD NEAR HIGHWAY 135. ANOTHER TREE
            BLOWN DOWN NEARBY ON PRINCE GEORGE ROAD.

&&

MCAVOY

Special weather statement, Aug 11, 12:23 AM EDT, 4 hours 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1223 AM EDT SAT AUG 11 2012

NCZ068-508-510-SCZ007-008-013-110515-
CHEROKEE-CLEVELAND-EASTERN POLK-GREATER RUTHERFORD-SPARTANBURG-UNION-
1223 AM EDT SAT AUG 11 2012

...STRONG THUNDERSTORMS WILL AFFECT CHEROKEE...NORTHERN UNION...
SOUTHEASTERN POLK...SOUTHERN RUTHERFORD...SOUTHWESTERN CLEVELAND AND
SPARTANBURG COUNTIES THROUGH 115 AM EDT...

AT 1222 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM FINGERVILLE TO
MOORE...MOVING EAST AT 30 MPH.

THESE STORMS WILL IMPACT LOCATIONS NEAR...
  BOILING SPRINGS SC...
  SPARTANBURG...
  MAYO...
  COWPENS...
  CLIFFSIDE...
  JONESVILLE...

SMALL HAIL...WIND GUSTS OF 40 TO 50 MPH AND TORRENTIAL RAIN ARE
EXPECTED WITH THESE STORMS.

LAT...LON 3475 8212 3478 8214 3521 8214 3531 8149
      3473 8150

JOH

Local storm report, Aug 11, 12:29 AM EDT, 4 hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1229 AM EDT SAT AUG 11 2012

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

1151 PM     TSTM WND DMG     4 W GREENVILLE          34.83N 82.44W
08/10/2012                   GREENVILLE         SC   911 CALL CENTER

            TREE DOWN ON SOUTH FLORIDA AVE AT EASLEY BRIDGE RD.

&&

MCAVOY

Local storm report, Aug 11, 12:51 AM EDT, 3 hours 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1251 AM EDT SAT AUG 11 2012

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

1157 PM     TSTM WND DMG     5 SSW GREENVILLE        34.78N 82.42W
08/10/2012                   GREENVILLE         SC   911 CALL CENTER

            A TREE AND A POWER LINE BLOWN DOWN ALONG DANHARDT ST.

&&

MCAVOY

Special weather statement, Aug 11, 2:02 AM EDT, 2 hours 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
202 AM EDT SAT AUG 11 2012

SCZ007-110645-
SPARTANBURG-
202 AM EDT SAT AUG 11 2012

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN SPARTANBURG COUNTY
THROUGH 245 AM EDT...

AT 156 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 3 MILES WEST OF INMAN...OR 14 MILES SOUTH OF
COLUMBUS...MOVING NORTHEAST AT 25 MPH.

* OTHER LOCATIONS AFFECTED INCLUDE BUT ARE NOT LIMITED TO LAKE
  BOWEN...MAYO...INMAN...FINGERVILLE...CHESNEE...CAMPOBELLO AND
  BOILING SPRINGS SC.

SMALL HAIL...WIND GUSTS OF 40 TO 50 MPH AND TORRENTIAL RAIN ARE
EXPECTED WITH THIS STORM.

FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...TRY TO
GET INDOORS OR INTO A HARD TOPPED VEHICLE. OTHERWISE...STAY AWAY FROM
OPEN AREAS AND ISOLATED HIGH OBJECTS SUCH AS TREES. WHEN INDOORS...
STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING WIRED ELECTRONIC
DEVICES. TRY TO UNPLUG UNNECESSARY APPLIANCES BEFORE THE STORM
APPROACHES.

LAT...LON 3504 8222 3513 8222 3520 8208 3518 8187
      3506 8181 3495 8218

07

Special weather statement, Aug 11, 4:29 AM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
429 AM EDT SAT AUG 11 2012

NCZ033-050-110915-
AVERY-MITCHELL-
429 AM EDT SAT AUG 11 2012

...A STRONG THUNDERSTORM WILL AFFECT AVERY AND CENTRAL MITCHELL
COUNTIES THROUGH 515 AM EDT...

AT 425 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR BANDANA...OR 8 MILES NORTHWEST OF SPRUCE
PINE...MOVING EAST AT 30 MPH.

* OTHER LOCATIONS AFFECTED INCLUDE BUT ARE NOT LIMITED TO LINVILLE...
  SUGAR MOUNTAIN...SPRUCE PINE...NEWLAND...MINNEAPOLIS...LEDGER...
  INGALLS...GRANDFATHER MOUNTAIN...CROSSNORE...BANNER ELK...BANDANA
  AND BAKERSVILLE.

SMALL HAIL...WIND GUSTS OF 40 TO 50 MPH AND TORRENTIAL RAIN ARE
EXPECTED WITH THIS STORM.

FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...TRY TO
GET INDOORS OR INTO A HARD TOPPED VEHICLE. OTHERWISE...STAY AWAY FROM
OPEN AREAS AND ISOLATED HIGH OBJECTS SUCH AS TREES. WHEN INDOORS...
STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING WIRED ELECTRONIC
DEVICES. TRY TO UNPLUG UNNECESSARY APPLIANCES BEFORE THE STORM
APPROACHES.

LAT...LON 3616 8182 3612 8181 3607 8173 3596 8181
      3598 8188 3600 8190 3593 8196 3590 8214
      3593 8215 3595 8219 3601 8219 3601 8225
      3599 8225 3606 8228 3619 8185

07

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 8:18 PM EDT	Special Weather Statement	GSP	Madison	27 min
Aug 10, 8:35 PM EDT	Severe Thunderstorm Warning	GSP	Buncombe, Madison	42 min
Aug 10, 9:06 PM EDT	Severe Thunderstorm Warning	GSP	Buncombe, McDowell, Yancey	54 min
Aug 10, 9:28 PM EDT	Areal Flood Advisory	GSP	Caldwell	2 hr
Aug 10, 10:00 PM EDT	Special Weather Statement	GSP	Buncombe	30 min
Aug 10, 10:01 PM EDT	Special Weather Statement	GSP	Burke	29 min
Aug 11, 4:43 AM EDT	Severe Thunderstorm Warning	GSP	Avery, Caldwell, Mitchell	62 min
Aug 11, 12:36 PM EDT	Special Weather Statement	GSP	Davie	39 min
Aug 11, 1:30 PM EDT	Areal Flood Advisory	GSP	Caldwell	85 min
Aug 11, 3:14 PM EDT	Special Weather Statement	GSP	Alexander	31 min
Aug 11, 3:21 PM EDT	Severe Thunderstorm Warning	GSP	Alexander	37 min
Aug 11, 4:40 PM EDT	Special Weather Statement	GSP	Iredell	35 min
Aug 11, 6:03 PM EDT	Special Weather Statement	GSP	Iredell	27 min
Aug 11, 6:35 PM EDT	Special Weather Statement	GSP	Iredell	40 min
Aug 11, 7:29 PM EDT	Areal Flood Advisory	GSP	Davie	106 min
Aug 10, 8:29 PM EDT	Special Weather Statement	GSP	Spartanburg	31 min
Aug 10, 10:46 PM EDT	Special Weather Statement	GSP	Pickens	44 min
Aug 10, 10:55 PM EDT	Severe Thunderstorm Warning	GSP	Anderson, Greenville, Oconee, Pickens	50 min
Aug 10, 11:39 PM EDT	Severe Thunderstorm Warning	GSP	Anderson, Greenville, Pickens, Spartanburg	66 min
Aug 11, 12:23 AM EDT	Special Weather Statement	GSP	Cherokee, Spartanburg	52 min
Aug 11, 2:02 AM EDT	Special Weather Statement	GSP	Spartanburg	43 min

Nearby

Special Weather Statements in North Carolina, 2012 Every special weather statement in 2012

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.