Alert archive / North Carolina / Flash Flood Warnings in 2015

Flash Flood Warning 19, NWS Greenville-Spartanburg, SC

August 18, 2015Union County, North Carolina

NWS Greenville-Spartanburg, SC issued this flash flood warning at Aug 18, 2015, 8:41 PM EDT for Union County, North Carolina. It was in force for 3 hr. 5 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
Aug 18, 2015, 8:41 PM EDT (00:41 UTC)
Expired
Aug 18, 2015, 11:45 PM EDT
In force
3 hr
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon
Flood severity
None

County Union County, NC

The radar

The Columbia radar (KCAE), 125 km from the middle of the area, began a volume at 00:45 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
Aug 18, 9:39 PM EDTHEAVY RAIN 3.585 Wnw Monroe, NCAT THE MONROE AIRPORT SINCE 754 PM. HEAVY RAIN STILL FALLING AT OBSERVATION TIME.
Aug 18, 9:54 PM EDTFLASH FLOOD4 Nne Waxhaw, NCUNION 911 REPORTS WAXHAW INDIAN TRAIL RD AT SHANNON RD IMPASSABLE DUE TO FLOODING.
Aug 18, 9:54 PM EDTFLASH FLOOD4 Sse Stallings, NCUNION 911 REPORTS WESLEY CHAPEL RD IMPASSABLE DUE TO FLOODING AT ROGERS RD AND TAYLOR GLENN RD.
Aug 18, 10:00 PM EDTFLASH FLOOD5 Nnw Monroe, NCUNION 911 REPORTS SECREST SHORT CUT RD AT ROCKY RIVER RD IMPASSABLE DUE TO FLOODING.
Aug 18, 10:20 PM EDTHEAVY RAIN 4.135 Wnw Monroe, NCSINCE 754 PM. HEAVY RAIN STILL FALLING AT OBSERVATION TIME.

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 5 storm reports to this flash flood warning; the first came 14 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 00:00Z, 0.7 hours before the alert went out and 138 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, Greensboro/Hi Pt, NC at 00:00Z on 2015-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 369 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, Greensboro/Hi Pt, NC at 00:00Z on 2015-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 square meters per square second.193958Sfc1 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
369 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
935 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
113 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.7

Open this sounding in Storm Lab

The text

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

205 
WGUS52 KGSP 190041
FFWGSP
NCC179-190345-
/O.NEW.KGSP.FF.W.0019.150819T0041Z-150819T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
841 PM EDT TUE AUG 18 2015

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN UNION COUNTY IN THE PIEDMONT OF NORTH CAROLINA...

* UNTIL 1145 PM EDT
    
* AT 837 PM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE
  FALLEN SINCE 730 PM EDT. FLASH FLOODING IS EXPECTED TO BEGIN
  SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  INDIAN TRAIL...WEDDINGTON...STALLINGS...WESLEY CHAPEL...LAKE
  PARK...HEMBY BRIDGE...MONROE...MINERAL SPRINGS...MARVIN AND WAXHAW.

* HEAVY RAIN WILL CAUSE RAPID RISES ON LOCAL CREEKS SUCH 12 MILE
  CREEK AND THE WEST BRANCH OF 12 MILE CREEK. FLOODING IN LOW LYING
  AREAS NEAR THE CREEKS WILL BE LIKELY...ESPECIALLY ALONG NEW
  TOWN...TWELVE MILE CREEK ROAD AND PART OF WESLEY CHAPEL ROAD.
  LOCAL STREAMS SUCH AS THE WEST AND EAST FORKS OF TWELVE MILE
  CREEK...AND CULVERT BRANCH WILL LIKELY FLOOD LOW LYING
  AREAS...ESPECIALLY ALONG ANTIOCH CHURCH NEAR HIGHVIEW ROAD.

ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO INCHES ARE POSSIBLE IN THE
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN VEHICLES. DO NOT DRIVE INTO AREAS WHERE
WATER COVERS THE ROADWAY. ONLY A FEW INCHES OF RAPIDLY FLOWING WATER
CAN CARRY AWAY YOUR VEHICLE. TURN AROUND...DONT DROWN.

PLEASE REPORT FLOOD WATER FLOWING OVER ROADS OR THREATENING
PROPERTY...OR LANDSLIDES 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 3495 8056 3495 8080 3496 8080 3504 8076
      3513 8065 3511 8056

$$

ARK
2 follow-up statements
133 
WGUS72 KGSP 190127
FFSGSP

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
927 PM EDT TUE AUG 18 2015

NCC179-190345-
/O.CON.KGSP.FF.W.0019.000000T0000Z-150819T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
UNION NC-
927 PM EDT TUE AUG 18 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT FOR
NORTHWESTERN UNION COUNTY...

AT 923 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN ACROSS THE WARNED AREA. RADAR ESTIMATES 3 TO 4 INCHES OF
RAIN HAVE FALLEN SINCE 730 PM EDT. FLASH FLOODING IS LIKELY
OCCURRING OR WILL BEGIN SHORTLY.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
INDIAN TRAIL...WEDDINGTON...STALLINGS...WESLEY CHAPEL...LAKE PARK...
HEMBY BRIDGE...MONROE...MINERAL SPRINGS...MARVIN AND WAXHAW.

ADDITIONAL RAINFALL AMOUNTS OF UP TO ONE INCH ARE POSSIBLE IN THE
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES.  ADDITIONALLY...
COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND
OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. MOST FLOOD DEATHS OCCUR IN VEHICLES. DO NOT
DRIVE INTO AREAS WHERE WATER COVERS THE ROADWAY. ONLY A FEW INCHES
OF RAPIDLY FLOWING WATER CAN CARRY AWAY YOUR VEHICLE. TURN
AROUND...DONT DROWN.

PLEASE REPORT FLOOD WATER FLOWING OVER ROADS OR THREATENING
PROPERTY...OR LANDSLIDES 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 3495 8056 3495 8080 3496 8080 3504 8076
      3513 8065 3511 8056

$$

ARK
299 
WGUS72 KGSP 190200
FFSGSP

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
1000 PM EDT TUE AUG 18 2015

NCC179-190345-
/O.CON.KGSP.FF.W.0019.000000T0000Z-150819T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
UNION NC-
1000 PM EDT TUE AUG 18 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT FOR
NORTHWESTERN UNION COUNTY...

AT 956 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN ACROSS THE WARNED AREA. THREE TO FOUR AND A HALF INCHES
OF RAIN HAVE FALLEN SINCE 730 PM EDT. FLASH FLOODING IS OCCURRING
IN THE WARNED AREA.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
INDIAN TRAIL...WEDDINGTON...STALLINGS...WESLEY CHAPEL...LAKE PARK...
HEMBY BRIDGE...MONROE...MINERAL SPRINGS...MARVIN AND WAXHAW.

WESLEY CHAPEL ROAD AT ROGERS ROAD AND TAYLOR GLENN...AND WEST LAWYER
ROADS ARE FLOODED. ALSO WAXHAW-INDIAN TRAIL ROAD AT SHANNON ROAD IS
ALSO FLOODED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES.  ADDITIONALLY...
COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND
OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

MOST FLOOD DEATHS OCCUR IN VEHICLES. DO NOT DRIVE INTO AREAS WHERE
WATER COVERS THE ROADWAY. ONLY A FEW INCHES OF RAPIDLY FLOWING WATER
CAN CARRY AWAY YOUR VEHICLE. TURN AROUND...DONT DROWN.

PLEASE REPORT FLOOD WATER FLOWING OVER ROADS OR THREATENING
PROPERTY...OR LANDSLIDES 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 3495 8056 3495 8080 3496 8080 3504 8076
      3513 8065 3511 8056

$$

ARK

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Aug 18, 8:23 PM EDT, 18 minutes earlier.

Area forecast discussion, Aug 18, 8:23 PM EDT, 18 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
823 PM EDT TUE AUG 18 2015

.SYNOPSIS...
A WET PATTERN WILL PERSIST ACROSS THE SOUTHEAST AS DEEP MOISTURE
REMAINS IN PLACE THROUGH MID-WEEK. A WEAK FRONT WILL APPROACH THE
AREA ON THURSDAY BRINGING YET ANOTHER CHANCE OF WIDESPREAD SHOWERS
AND THUNDERSTORMS. MORE TYPICAL CHANCES OF PRECIPITATION ARE
EXPECTED INTO THE WEEKEND WITH ANOTHER FRONT POSSIBLY ARRIVING BY
NEXT MONDAY.

&&

.NEAR TERM /THROUGH WEDNESDAY/...
AS OF 815 PM...SOME RATHER VIGOROUS CONVECTION HAS DEVELOPED ALONG
THE I-77 CORRIDOR IN THE PAST HOUR...WHERE TEMPS MANAGED TO WARM TO
AROUND 90 AFTER LATE DAY CLEARING. EVEN WITH THIS ACTIVITY...THE
SEVERE WEATHER THREAT IS LOW. MEANWHILE...STEERING CURRENTS ARE
PROVIDING A DECENT AMOUNT OF FORWARD MOMENTUM TO TODAY/S ACTIVITY...
SO THE LOCALLY EXCESSIVE RAINFALL THREAT SHOULD BE CONFINED TO AREAS
THAT MANAGE TO SEE TRAINING CELLS...MAINLY ACROSS THE URBAN CORRIDOR
EAST AND NORTH OF CHARLOTTE. LIKELY TO CATEGORICAL POPS WILL HANDLE
THE ONGOING ACTIVITY ACROSS THE EASTERN AND WESTERN ZONES. POPS WILL
THEN DROP OFF TO CHANCE BY MIDNIGHT IN MOST AREAS...AS IT DOES
APPEAR THAT THERE WILL BE AN OVERNIGHT LULL IN THIS MORE ORGANIZED
ACTIVITY.

AT 230 PM EDT TUESDAY...AN BROADENING UPPER TROUGH WILL BE OVER THE
CENTER OF THE NATION THROUGH WEDNESDAY...WHILE A WEAK UPPER RIDGE
WILL AMPLIFY SLIGHTLY OFF THE CAROLINA COAST. WEAK...CHANNELED
SHORTWAVE ENERGY AND SUBSTANTIAL MOISTURE FROM THE GULF WILL CROSS
THE SOUTHERN APPALACHIANS...SUPPORTING CONTINUED PRECIPITATION. LOW
LEVEL FLOW WILL VEER FROM S TO SW TONIGHT...REDUCING UPSLOPE FLOW
INTO THE BLUR RIDGE. MODEL TIME HEIGHTS SHOW MODEST INSTABILITY
PERSISTING OVERNIGHT...BUT THE BEST SUPPORT FOR CONVECTION WILL BE
DURING DAYTIME HEATING. WITH INSTABILITY RATHER LIMITED...SEVERE
WEATHER IS LESS OF A CONCERN THAN HEAVY LOCALLY HEAVY RAINFALL.
STEERING FLOW SHOULD KEEP CELLS MOVING HOWEVER. TEMPERATURES WILL
EXHIBIT A REDUCED DIURNAL RANGE DUE TO CLOUDS AND MOISTURE.

&&

.SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/...
AS OF 200 PM EDT TUESDAY...THE SHORT TERM FCST PERIOD INITIALIZES
WEDNESDAY EVENING AMIDST CONTINUED SOUTHWEST FLOW ALOFT AHEAD
OF A PROGRESSIVE LONGWAVE TROF THAT WILL BE SLIDING THROUGH THE
MID/UPPER MISSISSIPPI RIVER VALLEY.  IN THE LOW LEVELS...GULF
MOISTURE ADVECTION IS EXPECTED TO REMAIN PREVALENT THUS YIELDING
CONTINUED DEEP MOISTURE IN THE PROFILES ACROSS MUCH OF THE
SOUTHEAST TO INCLUDE NORTHEAST GA AND THE WESTERN CAROLINAS.
NEAR TERM GUIDANCE IS IN FAIRLY GOOD AGREEMENT REGARDING MODEST
DESTABILIZATION LEADING TO SCATTERED/NUMEROUS CONVECTION AT
FCST INITIALIZATION.  THUS THE FCST FEATURES LIKELY POPS OVER
THE HIGH TERRAIN TAPERED TO SOLID CHANCES EAST OVER THE NC/SC
PIEDMONT BEFORE ALL POPS TAPER DOWN TO SLIGHT CHANCES BY MORNING.
CANNOT RULE OUT ANY HYDRO ISSUES OVER THE ALREADY IMPACTED AREAS ON
WEDNESDAY EVENING AS PREVIOUS ACCUMULATIONS WILL WORK TO INCREASE
ANTECEDENT CONDITIONS SUPPORTIVE OF ISOLATED FLASH FLOODING.

A COLD FRONT TIED TO THE ABOVE MENTIONED SYNOPTIC TROF IS PROGGED
TO SLIDE INTO THE NC HIGH TERRAIN LATE ON THURSDAY NIGHT.  AHEAD OF
SAID FRONT...THE ATMOSPHERE WILL DESTABILIZE WITH HEATING TO THE
POINT OF SUPPORTING AT LEAST SCATTERED CONVECTION OVER THE LOW
TERRAIN...WITH NUMEROUS SHOWERS AND THUNDERSTORMS POSSIBLE ALONG
THE BLUE RIDGE THEREFORE FCST POPS FEATURE SUCH ON THURSDAY.
PROFILES WILL CONTINUE TO BE MOIST WITH PWATS EXCEEDING 1-2 SDS
ABOVE NORMAL...WHICH COMBINED WITH UNIDIRECTIONAL SHEAR SUPPORTING
POSSIBLE TRAINING STORMS...COULD YIELD FURTHER ENHANCEMENT OF
ISOLATED FLASH FLOODING ISSUES.  THE FRONT ITSELF IS FCST TO SLIDE
THROUGH THE REGION OVERNIGHT INTO FRIDAY MORNING FINALLY CUTTING OFF
THE WARM MOIST SOUTHWESTERLY CONVEYOR BELT.  THAT SAID...LITTLE IF
ANY DRY AIR ADVECTION IS EXPECTED AS THE BOUNDARY WILL SLOW...AND
COULD STALL OVER OR JUST SOUTH OF THE FCST AREA THEREFORE CHANCE
POPS REMAIN IN THE FCST ON FRIDAY.  TEMPERATURES THROUGH THE
ENTIRE SHORT TERM PERIOD WILL GENERALLY REMAIN NEAR NORMAL WITH
SOME LOWER DEVIATION LIKELY THANKS TO PARTLY/MOSTLY CLOUDY SKIES
AND RAINFALL EACH DAY.

&&

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
AS OF 230 PM EDT TUESDAY...THE EXTENDED PERIOD BEGINS FRIDAY
EVENING WITH A MID-LEVEL ANTICYCLONE OVER THE EASTERN GULF COAST
WITH AN ASSOCIATED RIDGE AXIS EXTENDING NORTHEAST OVER THE ATLANTIC
COASTAL PLAIN.  THE PRIMARY OR LONGWAVE STORM TRACK EXTENDS FROM THE
PACIFIC NORTHWEST TOWARDS THE HUDSON BAY...LEAVING MUCH OF THE CONUS
IN A FAIRLY ZONAL FLOW.  EMBEDDED IN THIS FLOW ARE SEVERAL
PERTURBATIONS...WITH THE MOST NOTABLE ONE ACROSS THE SOUTHERN
PLAINS. THE RESULTANT FLOW ALOFT OVER THE FORECAST AREA IS WEST-
SOUTHWESTERLY...AND AHEAD OF THE SOUTHERN PLAINS SHORTWAVE WILL BE
AT LEAST A COUPLE OF WEAK PULSES OF VORTICITY THAT TRAVERSE NEAR THE
AREA THROUGH SUNDAY.  BY SUNDAY EVENING THE SOUTHERN PLAINS WAVE
WILL BE APPROACHING THE SOUTHERN APPALACHIANS AND THE RESULTANT
TROUGH WILL BE AMPLIFIED BY MORE SUBSTANTIAL ENERGY ASSOCIATED WITH
A STRONG CLOSED LOW EMBEDDED IN THE LONGWAVE STORM TRACK ACROSS THE
UPPER MIDWEST.  THEREAFTER...THERE EXISTS SIGNIFICANT DIFFERENCES
BETWEEN THE GUIDANCE IN HOW THE CLOSED LOW EVOLVES AND WHETHER OR
NOT THE FORECAST AREA LIES TO THE EAST OF A LONGWAVE TROUGH AXIS
ALIGNED OVER THE LOWER MISSISSIPPI RIVER VALLEY OR SLIGHTLY TO THE
WEST OF A RESIDUAL TROUGH AXIS THAT EXTENDS FROM THE PIEDMONT TO THE
GULF OF MEXICO.  REGARDLESS...THERE IS CONSENSUS THAT A DEEP-LAYER
RIDGE WILL DEVELOP OVER THE INTERMOUNTAIN WEST BY TUESDAY OF NEXT
WEEK AND THAT SHOULD AT LEAST RESULT IN A GENERAL TROUGH PATTERN
OVER THE EASTERN CONUS.

AT THE SURFACE...A RESIDUAL FRONTAL BOUNDARY WILL LIE ACROSS THE
CENTRAL CAROLINAS FRIDAY EVENING AND WILL GRADUALLY BE SHUNTED SOUTH
TOWARDS THE GULF COASTAL PLAIN AS SURFACE HIGH PRESSURE BUILDS IN
ACROSS THE NORTHEAST AND NOSES DOWN THE BLUE RIDGE THROUGH SUNDAY
MORNING.  THE COLD FRONT ATTENDANT WITH THE UPPER MIDWEST CLOSED LOW
WILL APPROACH THE FORECAST AREA SUNDAY NIGHT INTO MONDAY MORNING
WITH A LARGE SURFACE HIGH OVER THE MIDWEST.  THE FRONT IS EXPECTED
TO PASS THROUGH THE AREA WITH HIGH PRESSURE CENTERED OVER THE
EASTERN GREAT LAKES BY MONDAY NIGHT. ONCE AGAIN HOWEVER...THE
GUIDANCE DIFFERENCES IN THE UPPER-LEVEL PATTERN RESULT IN DIFFERENT
SENSIBLE WEATHER IMPACTS FOR OUR AREA FOLLOWING THE FRONT ON TUESDAY
INTO WEDNESDAY.  GIVEN THE ANOMALOUS NATURE OF THE LONGWAVE TROUGH
SOLUTION BY THE ECMWF...OPTED FOR WHAT APPEARS TO BE A MORE
CLIMATOLOGICAL SOLUTION BY THE GFS...WHICH FAVORS A NORTHEASTERLY OR
EASTERLY LOW-LEVEL...UPSLOPE FLOW ACROSS THE AREA INSTEAD OF A FALL-
LIKE CLEANER FRONTAL PASSAGE AND BETTER NORTHWESTERLY FLOW AND DRY-
AIR ADVECTION BEHIND THE FRONT.  THE PREFERRED SOLUTION THEREFORE
MAINTAINS CHANCE POPS THROUGH THE END OF THE PERIOD...SLIGHTLY BELOW
NORMAL MAXIMUM TEMPERATURES...AND NEAR NORMAL MINIMUM TEMPERATURES.
WITH SLIGHTLY LESS AVAILABLE MOISTURE IN THE COLUMN AND A LACK OF
NOTABLE FORCING THROUGH THE PERIOD...6-HOUR AREAL-AVERAGED QPF
VALUES REMAIN LIGHT...THOUGH THE NORMAL THREAT FOR LOCALLY HEAVY
RAIN EACH DAY REMAINS.

&&

.AVIATION /01Z WEDNESDAY THROUGH SUNDAY/...
AT KCLT...HEAVY RAIN SHOWERS S/SW OF THE TERMINAL MAY BRUSH THE
TERMINAL DURING THE NEXT HOUR OR SO...WITH TS/GUSTY WINDS POSSIBLE.
ONCE THIS PASSES THROUGH...ANOTHER AREA OF SHOWERS...CURRENTLY NEAR
THE GA/SC BORDER MAY MOVE ACROSS THE TERMINAL BY LATE IN THE
EVENING...SO ANOTHER ROUND OF TEMPO W/ SHRA IS ADVERTISED DURING
THAT TIME. OTHERWISE...CONFIDENCE IS BELOW AVERAGE AFTER ABOUT 06Z
IN TERMS OF IF/WHEN FOG/LOW STRATUS WILL FORM. SOME OF THE SHORT
TERM GUIDANCE SOURCES ACTUALLY DRY THE LOW LEVELS OUT A BIT...AS THE
LOW LEVEL FLOW TURNS TO THE W/SW. MEANWHILE...GUIDANCE IN GENERAL
DOES NOT SUPPORT MUCH IN THE WAY OF SIGNIFICANT FLT RESTRICTIONS.
NEVERTHELESS...CONSIDERING THE AMOUNT OF MOISTURE IN THE
ENVIRONMENT...OPTED TO INCLUDE A SCT008 MENTION TOWARD DAYBREAK.
WITH MOISTURE REMAINING ABOVE NORMAL...AND PERHAPS A LITTLE MORE IN
THE WAY OF INSTABILITY...AT LEAST SCT SHOWERS AND THUNDERSTORMS ARE
EXPECTED TO DEVELOP AGAIN WED AFTERNOON.

ELSEWHERE...WEAKENING AREA OF SHOWERS AND ISOLATED TS WILL MOVE
ACROSS THE TERMINALS THIS EVENING...WARRANTING TEMPOS OVER THE NEXT
2-3 HOURS. AFTER THAT...IT APPEARS THAT THERE WILL BE A LULL IN
ORGANIZED SHOWER/THUNDERSTORM ACTIVITY...ALTHOUGH WITH THE
ATMOSPHERE REMAINING UNSEASONABLY MOIST...CANNOT RULE OUT A PASSING
SHOWER AT ANY TIME...THUS VCSH WAS CARRIED INTO THE MORNING HOURS AT
ALL SITES. OTHERWISE...CONFIDENCE IS BELOW AVERAGE AFTER ABOUT 06Z
IN TERMS OF IF/WHEN GOB/LOW STRATUS WILL FORM. SOME OF THE SHORT
TERM GUIDANCE SOURCES ACTUALLY DRY THE LOW LEVELS OUT A BIT...AS THE
LOW LEVEL FLOW TURNS TO THE W/SW. MEANWHILE...GUIDANCE IN GENERAL
DOES NOT SUPPORT MUCH IN THE WAY OF SIGNIFICANT FLT RESTRICTIONS.
THE ONLY EXCEPTION IS AT KAVL...BUT EVEN THERE CONFIDENCE WAS NOT
HIGH ENOUGH TO GO ANY LOWER THAN THE HIGH END OF IFR.
NEVERTHELESS...CONSIDERING THE AMOUNT OF MOISTURE IN THE
ENVIRONMENT...CANNOT RULE OUT FLT RESTRICTIONS...INCLUDING POSSIBLY
IFR CONDITIONS TOWARD DAYBREAK. WITH MOISTURE REMAINING ABOVE
NORMAL...AND PERHAPS A LITTLE MORE IN THE WAY OF INSTABILITY...AT
LEAST SCT SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP AGAIN WED
AFTERNOON.

OUTLOOK...MOISTURE IS EXPECTED TO HIGH FOR MUCH OF THE WEEK. ABOVE-
NORMAL CHANCES FOR MAINLY DIURNAL SHOWERS AND THUNDERSTORMS WILL
RESULT...WITH CONVECTIVE CHANCES LIKELY CONTINUING INTO THE
OVERNIGHT MOST DAYS. NOCTURNAL LOW STRATUS AND FOG WILL ALSO BE
POSSIBLE...ESP IN MTN VALLEYS AND IN LOCATIONS THAT SAW HEAVY
RAIN THE DAY BEFORE.

CONFIDENCE TABLE...

            00-06Z        06-12Z        12-18Z        18-00Z
KCLT       HIGH 100%     HIGH  99%     HIGH  98%     HIGH 100%
KGSP       HIGH  91%     HIGH  98%     HIGH  96%     HIGH 100%
KAVL       MED   68%     MED   76%     HIGH  85%     HIGH 100%
KHKY       HIGH  91%     HIGH  82%     HIGH  88%     HIGH 100%
KGMU       HIGH  86%     MED   70%     HIGH  99%     HIGH 100%
KAND       HIGH  86%     HIGH  94%     HIGH  84%     HIGH 100%

THE PERCENTAGE REFLECTS THE NUMBER OF GUIDANCE MEMBERS AGREEING
WITH THE SCHEDULED TAF ISSUANCE FLIGHT RULE CATEGORY. COMPLETE HOURLY
EXPERIMENTAL AVIATION FORECAST CONSISTENCY TABLES AND ENSEMBLE FORECASTS
ARE AVAILABLE AT THE FOLLOWING LINK: (MUST BE LOWER CASE)

WWW.WEATHER.GOV/GSP/AVIATION

&&

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

&&

SYNOPSIS...JMP
NEAR TERM...JAT/JDL
SHORT TERM...CDG
LONG TERM...JMP
AVIATION...JDL
Hazardous weather outlook, Aug 18, 3:54 PM EDT, 4 hours 47 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
354 PM EDT TUE AUG 18 2015

GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065-
068>072-082-501>510-SCZ001>014-019-192000-
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-
354 PM EDT TUE AUG 18 2015

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

NUMEROUS TO WIDESPREAD SHOWERS AND THUNDERSTORMS WILL CONTINUE
THROUGH THE EVENING INTO THE OVERNIGHT. MULTIPLE ROUNDS OF
MODERATE TO HEAVY PRECIPITATION OVER ALREADY SOAKED AREAS COULD
LEAD TO ISOLATED FLASH FLOODING DURING THIS TIMEFRAME. IN
ADDITION...A FEW ISOLATED STRONG THUNDERSTORMS CANNOT BE RULED OUT
WITH GUSTY WINDS AND CLOUD TO GROUND LIGHTNING BEING THE PRIMARY
THREATS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

..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.
..MONDAY...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

NONE.

CDG

In the hours before

Special weather statement, Aug 18, 7:30 PM EDT, 1 hour 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
730 PM EDT TUE AUG 18 2015

GAZ017-018-190000-
STEPHENS GA-HABERSHAM GA-
730 PM EDT TUE AUG 18 2015

...STRONG THUNDERSTORM WILL IMPACT PORTIONS OF STEPHENS AND SOUTHERN
HABERSHAM COUNTIES UNTIL 800 PM EDT...

AT 730 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7
MILES SOUTHWEST OF CLARKESVILLE...OR NEAR BALDWIN...MOVING EAST AT 25
MPH.

WIND GUSTS UP TO 40 MPH AND VERY HEAVY RAINFALL RATES UP TO 2 INCHES
PER HOUR WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
TOCCOA...CLARKESVILLE...CORNELIA...BALDWIN...DEMOREST...MOUNT AIRY...
ALTO...MARTIN...AVALON AND RAOUL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL MAY FLOOD AREAS WITH POOR DRAINAGE...SUCH AS
DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED
ROADS. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE
RAPIDLY. SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS.

&&

LAT...LON 3454 8362 3460 8364 3470 8335 3468 8334
      3468 8332 3464 8326 3461 8323 3461 8316
      3459 8317 3457 8314 3452 8312 3449 8316
      3447 8326 3446 8339 3448 8347 3449 8354
      3443 8361 3450 8367
TIME...MOT...LOC 2330Z 252DEG 22KT 3451 8359

ARK
Special weather statement, Aug 18, 7:53 PM EDT, 48 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
753 PM EDT TUE AUG 18 2015

NCZ071-082-190030-
UNION NC-MECKLENBURG NC-
753 PM EDT TUE AUG 18 2015

...CLUSTER OF THUNDERSTORMS WILL IMPACT PORTIONS OF SOUTHEASTERN
MECKLENBURG AND CENTRAL UNION COUNTIES UNTIL 830 PM EDT...

AT 753 PM EDT...DOPPLER RADAR INDICATED THE LEADING EDGE OF A CLUSTER
OF THUNDERSTORMS ALONG A LINE EXTENDING FROM 11 MILES WEST OF MONROE
TO 9 MILES NORTH OF LANCASTER...AND MOVING EAST AT 5 MPH.

VERY HEAVY RAINFALL RATES UP TO 2 INCHES PER HOUR WILL BE POSSIBLE
WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
MONROE...MATTHEWS...INDIAN TRAIL...WEDDINGTON...STALLINGS...
UNIONVILLE...WESLEY CHAPEL...WAXHAW...LAKE PARK AND MINERAL SPRINGS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL MAY FLOOD AREAS WITH POOR DRAINAGE...SUCH AS
DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED
ROADS. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE
RAPIDLY. SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS.

&&

LAT...LON 3482 8079 3485 8079 3494 8078 3495 8080
      3510 8081 3521 8054 3518 8051 3482 8048
TIME...MOT...LOC 2353Z 259DEG 6KT 3505 8073 3486 8072

ARK
Special weather statement, Aug 18, 8:03 PM EDT, 38 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
803 PM EDT TUE AUG 18 2015

GAZ017-018-026-190030-
FRANKLIN GA-STEPHENS GA-HABERSHAM GA-
803 PM EDT TUE AUG 18 2015

...STRONG THUNDERSTORM WILL IMPACT PORTIONS OF STEPHENS...
SOUTHEASTERN HABERSHAM AND NORTHERN FRANKLIN COUNTIES UNTIL 830 PM
EDT...

AT 803 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 4
MILES WEST OF TOCCOA...MOVING EAST AT 25 MPH.

VERY HEAVY RAINFALL RATES UP TO 2 INCHES PER HOUR WILL BE POSSIBLE
WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
TOCCOA...GUMLOG...MARTIN...AVALON...MOUNT AIRY...LAVONIA...
EASTANOLEE...BOYDVILLE AND HOLLYWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL MAY FLOOD AREAS WITH POOR DRAINAGE...SUCH AS
DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED
ROADS. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE
RAPIDLY. SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS.

&&

LAT...LON 3467 8332 3464 8326 3461 8323 3460 8317
      3459 8317 3459 8316 3456 8314 3456 8313
      3453 8310 3453 8308 3452 8309 3447 8307
      3445 8308 3445 8339 3446 8340 3449 8349
      3463 8351
TIME...MOT...LOC 0003Z 261DEG 20KT 3456 8341

ARK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 8:18 PM EDTAreal Flood AdvisoryGSPCabarrus, Mecklenburg, Union117 min
Aug 18, 8:55 PM EDTAreal Flood AdvisoryGSPDavie, Iredell, Rowan2 hr
Aug 18, 9:17 PM EDTFlash Flood WarningGSPUnion2 hr
Aug 18, 11:38 PM EDTAreal Flood WarningGSPUnion3 hr
Aug 19, 1:47 PM EDTSpecial Weather StatementGSPAlexander28 min
Aug 19, 2:11 PM EDTSevere Thunderstorm WarningGSPAlexander, Iredell49 min
Aug 19, 2:13 PM EDTSpecial Weather StatementGSPRutherford47 min
Aug 19, 2:59 PM EDTSevere Thunderstorm WarningGSPDavie, Iredell, Rowan61 min
Aug 19, 4:14 PM EDTSpecial Weather StatementGSPIredell31 min
Aug 19, 4:24 PM EDTSevere Thunderstorm WarningGSPCabarrus, Rowan66 min
Aug 19, 4:51 PM EDTFlash Flood WarningGSPCabarrus, Rowan4 hr
Aug 19, 5:39 PM EDTSevere Thunderstorm WarningGSPDavie48 min
Aug 19, 5:54 PM EDTAreal Flood AdvisoryGSPMecklenburg, Union2 hr
Aug 19, 6:08 PM EDTFlash Flood WarningGSPMecklenburg, Union3 hr
Aug 19, 6:49 PM EDTFlash Flood WarningGSPMecklenburg3 hr

Nearby

Flash Flood Warnings in North Carolina, 2015Every flash flood warning in 2015

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.