Tornado and Flash Flooding in North Carolina, September 5 to 6, 2011

Name: Tornado and Flash Flooding in North Carolina, September 5 to 6, 2011
Start: 2011-09-05T16:20
End: 2011-09-06T22:00
Location: North Carolina

September 5 to 6, 2011 · NWS RNK · 11 events in 5 counties and zones

Remnants of Tropical Storm Lee moved northeast through the Tennessee Valley. Strong shear on the east side of the system was responsible for generating numerous rotating thunderstorms.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $1.6 million
Crop damage: None recorded
Events: 11

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS RNK wrote it up.

Remnants of Tropical Storm Lee moved northeast through the Tennessee Valley. Strong shear on the east side of the system was responsible for generating numerous rotating thunderstorms. One rotating storm produced a tornado in Wilkes County near Abshers. Other storms produced severe weather in the form of damaging winds. Very heavy rain was also associated with the system. Flooding and flash flooding occurred over parts of the region. The heaviest rainfall was concentrated along the crest of the blue ridge where three to five inches of rain fell. Some bursts of heavy rain had rainfall rates between one and two inches per hour.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Blacksburg, VA wrote its last area forecast discussion before the first event at Sep 5, 3:27 PM EST, 53 minutes earlier.

Area forecast discussion, Sep 5, 3:27 PM EST, 53 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BLACKSBURG VA
427 PM EDT MON SEP 5 2011

.SYNOPSIS...
A COLD FRONT HAS STALLED ALONG THE APPALACHIAN MOUNTAINS FROM
PENNSYLVANIA TO GEORGIA. THE REMNANTS OF TROPICAL STORM LEE WILL
SLOWLY MOVE NORTHEAST ALONG THIS BOUNDARY TONIGHT AND TUESDAY.
DEEP TROPICAL MOISTURE IS FLOWING INTO THE REGION...AND WILL
RESULT ING WIDESPREAD HEAVY RAIN.

&&

.NEAR TERM /THROUGH TUESDAY/...
AS OF 400 PM EDT MONDAY...

REMNANTS OF LEE OVER SERN MS THIS AFTN WILL LIFT NE TONIGHT INTO
TUESDAY. STRONG LOW LEVEL FLOW OF TROPICAL MOISTURE WILL
INTERSECT FRONTAL BOUNDARY...WITH UPSLOPE DEVELOPING INTO THE CNTRL
APLCHNS TONIGHT INTO TUESDAY. EXPANDED THE FLASH FLOOD WATCH
EASTWARD TO INCLUDE ALL OF CWA...WHICH MATCH UP NICELY WITH AKQ AND
LWX. HPC HAS PLACED CWA UNDER A MODERATE TO HIGH RISK FOR EXCESSIVE
RAINFALL THROUGH TUESDAY.

UPPER DYNAMICS/MOISTURE TRANSPORT COME TOGETHER BETTER FOR US
AROUND 00Z/8 PM AND LASTS INTO TUESDAY MORNING...ESPECIALLY IN THE
SOUTHERN/SWRN CWA. FOR TONIGHT LOWS...WITH HIGHER DEWPOINTS IN
TROPICAL AIRMASS FOLLOWED MILDER ADJMET WITH READINGS FROM THE MID
50S IN THE MOUNTAINS TO AROUND 70 IN SOUTHEAST.

PERIODS OF RAIN...HEAVY AT TIMES CONTINUE TUESDAY AS THE REMNANTS OF
TROPICAL DEPRESSION LEE MAKE THEIR WAY NORTHWARD...MOVING AS A LOW
PRESSURE SYSTEM ALONG A COLD FRONT STRETCHING FROM THE MID ATLANTIC
COAST THROUGH THE FLORIDA PANHANDLE.

DEEP TROPICAL MOISTURE RADIATING NORTHWARD FROM POST TROPICAL
LEE... COMBINED WITH STRONG LIFT AS THIS MOISTURE OVERRUNS THE
FRONT... WILL SUPPORT PROLONGED PERIODS OF HEAVY RAIN ALONG THE
BLUE RIDGE... ESPECIALLY ALONG SOUTH FACING SLOPES WHERE
OROGRAPHIC LIFT WILL ENHANCE THE POSSIBILITY OF HEAVY RAIN.

IN ADDITION TO THE FLOOD THREAT...STRONG LIFT WILL COMBINE WITH
ABUNDANT VORTICITY YEILDING A TORNADIC THREAT. CAPES 500-1000 EAST
OF MTNS...LOW LCL...UNCAPPED HIGH SHEAR ENVIRONMENT TO SUPPORT LOW
TOPPED HYBRID SUPERCELLS. THIS WILL BE AN ONGOING ISSUE UNTIL THE
LOW LEVEL CIRCULATION PASSES.

HIGHS TEMPERATURES TUESDAY WILL RANGE FROM THE UPPER 60S WEST OF
THE BLUE RIDGE...TO THE MID 70S ACROSS THE PIEDMONT REGION.

&&

.SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY NIGHT/...
AS OF 400 PM MONDAY...

BIG QUESTION AS TO MAGNITUDE OF LINGERING MOISTURE WEDNESDAY AND
THURSDAY. REMNANTS AND LOW LEVEL CIRCULATION FROM TROPICAL STORM
LEE SHOULD MOVE NORTHEAST ALONG THE STALLED APPALACHIAN FRONTAL
BOUNDARY. HOWEVER...MODELS INSIST THE UPPER LEVEL CIRCULATION WILL
LINGER OVER TN/KY WITH CONTINUED RESIDUAL THREAT FOR SHOWERS.
ATTM PREFER GFS SOLUTION WITH DRY SLOT BEHIND LOW AND MID LEVEL
CIRCULATION TUESDAY NIGHT FOLLOWED BY RENUAL OF SHOWER
THREAT...ESP MTNS...FROM WEDNESDAY INTO THURDAY. THE LATER HALF OF
THE WEEK LOOKS UNSETTLED...ALTHOUGH THINK SOME SUN TO FILTER
THROUGH THE CLOUDS EAST OF THE MTNS.

HURRICANE KATIA IS STILL FCST TO MAKE RIGHT HAND TURN
THURSDAY...GAINING LATITUDE AND BEING TURNED NORTH THEN NORTHEAST
AWAY FROM THE U.S. MAINLAND.

TEMPERATURE FORECAST FOR MID WEEK IS DEPENDANT ON AMOUNT OF COLD
AIR THAT IS ABLE TO MAKE IT EAST OF THE MTNS...IN ADDITION TO
CLOUD COVER. FOR NOW WILL KEEP READINGS COOL IN THE MTNS...AND
RAISED THEM A BIT EAST OF THE MTNS WHERE MORE SUN IS ANTICIPATED.

&&

.LONG TERM /FRIDAY THROUGH MONDAY/...
AS OF 400 PM EDT MONDAY...

WEEKEND FORECAST HINGES ON REMNANTS OF THE UPPER CUTOFF LOW.
LATEST GUIDANCE WEAKENS AND PINWHEELS THE FEATURE WESTWARD.
THIS SUGGESTS TEMPERATURES SHOULD MODERATE...WITH DECREASING
MOISTURE...ESP EAST OF BLUE RIDGE. WITH UPPER SUPPORT
WANING...THINK SHOWER THREAT WILL BECOME MORE DIRUNALLY DRIVEN.
&&

.AVIATION /20Z MONDAY THROUGH SATURDAY/...
AS OF 1256 AM EDT MONDAY...
MVFR CONDITIONS WITH POCKETS OF IFR/LIFR EXPECTED THIS AFTERNOON
INTO TUESDAY. RAIN...HEAVY AT TIMES WITH EMBEDDED THUNDERSTORMS
WILL SPREAD ACROSS THE REGION THIS AFTERNOON INTO TUESDAY. A
FRONTAL BOUNDARY WILL COMBINED WITH THE REMNANTS OF TROPICAL LEE
TO PRODUCED RAIN...LOW CLOUDS AND FOG.

THIS UNSETTLED WEATHER PATTERN SHOULD HOLD THROUGH TUE NIGHT/WED AND
POSSIBLY INTO EARLY THURSDAY...AS THE UPPER SYSTEM STAYS SITUATED
ACROSS THE REGION.

BESIDES THE HEAVY RAIN THREAT...THERE IS AN ISOLATED RISK FOR
SEVERE TSRA MAINLY SOUTH OF THE VA/NC BORDER TUESDAY. SO WILL HAVE
TO WATCH FOR TURBULENCE ISSUES AND WIND SHEAR.

STILL THE MAIN ISSUE WILL BE CIGS FLUCTUATING FROM SUB 1KFT TO ABOVE
1KFT DURING PERIODS OF MODERATE TO HEAVIER RAINS INTO TUESDAY. AS IS
USUALLY THE CASE...CIGS TEND TO INCREASE WITH HEAVIER RAINS AND
MIXING...ALTHOUGH FOR MOST OF THE TIME WILL KEEP CIGS AT OR BELOW
1KFT AT ALL TAF SITES.

CONFIDENCE IS THIS SCENARIO IS HIGH.

THIS CONDITIONS COULD POSSIBLY LINGER INTO WEDNESDAY OR THURSDAY
DEPENDING ON THE EVENTUAL MOVEMENT OF THE SYSTEMS AND EXTENT OF
COOL AIR WEDGING THAT OCCURS IN THE FORECAST AREA BEHIND THE COOL
FRONT BEFORE THE TROPICAL SYSTEM AND SLOWLY MOVING CLOSED UPPER
LOW PRESSURE SYSTEM FINALLY CLEAR THE AREA.

&&

.HYDROLOGY...
AS OF 400 PM EDT MONDAY...

EXCESSIVE RAINFALL EXPECTED TONIGHT AND TUESDAY AS REMNANTS OF LEE
INTERACT WITH FRONTAL ZONE. HPC FORECASTING IN EXCESS OF 6 INCHES
ACROSS THE SRN APPS. AREAS WEST OF THE BLUE RIDGE HAVE HAD SOME
POCKETS OF HEAVIER RAINS OVER THE PAST 3 DAYS AND THIS MAY PUSH
LOCAL MOUNTAIN STREAMS INTO FLOOD QUICKER THAN STREAMS EAST OF THE
BLUE RIDGE. ATTM...FORECASTING RAINFALL AMOUNTS OF 4 TO 8 INCHES
WITH HIGHEST AMOUNTS IN THE NC MTNS/FOOTHILLS AND LESS AS YOU HEAD
NE INTO THE PIEDMONT EAST OF LYH/DAN. 3 HR FFG VALUES ARE RUNNING
UNDER 2.5 INCHES ACROSS THE NEW RIVER VALLEY INTO SE WV AND FAR SW
VA. THIS SETUP MAY BE A TWO FOLD PROBLEM WITH FLASH FLOODING
POSSIBLE IN ANY HIGHER CONVECTIVE BANDS THAT FORM...THEN JUST THE
SHEAR AMOUNT OF RAIN OVER THE NEXT 36 HOURS COULD LEAD TO MAIN
STEM FLOODING ALONG LARGER CREEKS AND INTO THE RIVERS.

&&

.RNK WATCHES/WARNINGS/ADVISORIES...
VA...FLASH FLOOD WATCH THROUGH LATE TUESDAY NIGHT FOR VAZ007-
     009>020-022>024-032>035-043>047-058-059.
NC...FLASH FLOOD WATCH THROUGH LATE TUESDAY NIGHT FOR NCZ001>006-
     018>020.
WV...FLASH FLOOD WATCH THROUGH LATE TUESDAY NIGHT FOR WVZ042>045.

&&

SYNOPSIS...PM
NEAR TERM...KK
SHORT TERM...PM
LONG TERM...PM
AVIATION...KK
HYDROLOGY...

Hazardous weather outlook, Sep 5, 2:23 PM EST, 1 hour 57 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
323 PM EDT MON SEP 5 2011

NCZ001-002-018-VAZ007-009>020-022>024-WVZ042>045-061930-
ASHE-ALLEGHANY NC-WATAUGA-TAZEWELL-SMYTH-BLAND-GILES-WYTHE-PULASKI-
MONTGOMERY-GRAYSON-CARROLL-FLOYD-CRAIG-ALLEGHANY VA-BATH-ROANOKE-
BOTETOURT-ROCKBRIDGE-MERCER-SUMMERS-MONROE-GREENBRIER-
323 PM EDT MON SEP 5 2011

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TUESDAY NIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST NORTH
CAROLINA...SOUTHWEST VIRGINIA...WEST CENTRAL VIRGINIA AND SOUTHEAST
WEST VIRGINIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   FLASH FLOOD WATCH.

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

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

  FLASH FLOOD WATCH THROUGH TUESDAY NIGHT. FLASH FLOODING
  POSSIBLE ON SMALL STREAMS. SIGNIFICANT RISES LIKELY ON AREA
  RIVERS.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT RAINFALL AMOUNTS AND OBSERVED
FLOODING.

NCZ003>006-019-020-VAZ032>035-043>047-058-059-061930-
SURRY-STOKES-ROCKINGHAM-CASWELL-WILKES-YADKIN-PATRICK-FRANKLIN-
BEDFORD-AMHERST-HENRY-PITTSYLVANIA-CAMPBELL-APPOMATTOX-BUCKINGHAM-
HALIFAX-CHARLOTTE-
323 PM EDT MON SEP 5 2011

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TUESDAY NIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL NORTH
CAROLINA...NORTHWEST NORTH CAROLINA...CENTRAL VIRGINIA...SOUTH
CENTRAL VIRGINIA...SOUTHWEST VIRGINIA AND WEST CENTRAL VIRGINIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   FLASH FLOOD WATCH.

   IN ADDITION TO THE FLOOD THREAT...ISOLATED TORNADOES ARE ALSO
   POSSIBLE.

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

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

  FLASH FLOOD WATCH THROUGH TUESDAY NIGHT.  FLASH FLOODING
  POSSIBLE ON SMALL STREAMS. SIGNIFICANT RISES LIKELY ON AREA
  RIVERS.

  IN ADDITION TO THE FLOOD THREAT...ISOLATED TORNADOES ARE ALSO
  POSSIBLE TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

In the hours before

Special weather statement, Sep 5, 2:53 PM EST, 1 hour 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
353 PM EDT MON SEP 5 2011

NCZ001>003-019-VAZ015-016-052045-
ALLEGHANY NC-ASHE NC-CARROLL VA-GRAYSON VA-SURRY NC-WILKES NC-
353 PM EDT MON SEP 5 2011

...A SHOWER WITH HEAVY RAIN WILL AFFECT ALLEGHANY...ASHE...CARROLL...
GRAYSON...SURRY AND WILKES COUNTIES...

AT 351 PM EDT...A SHOWER WITH HEAVY RAIN WAS LOCATED OVER WILBAR...
MOVING NORTHEAST AT 35 MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS SHOWER. VERY HEAVY RAIN
WILL FALL FROM THIS SHOWER...AND WILL CAUSE WATER TO POND ON ROADS
AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

THIS SHOWER WILL BE NEAR HALLS MILLS...AND WAGONER AROUND 400 PM...
MC GRADY AROUND 405 PM...LAUREL SPRINGS AROUND 410 PM...DOUGHTON
PARK...AND SCOTTVILLE AROUND 415 PM...WHITEHEAD...AND STONE MOUNTAIN
STATE PARK AROUND 420 PM.

FOR ADDITIONAL WEATHER INFORMATION...VISIT US ON THE WEB AT
HTTP://WEATHER.GOV.

LAT...LON 3664 8128 3663 8070 3617 8131 3627 8148

AMS

Special weather statement, Sep 5, 4:13 PM EST, 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
513 PM EDT MON SEP 5 2011

NCZ002-003-019-052145-
ALLEGHANY NC-SURRY NC-WILKES NC-
513 PM EDT MON SEP 5 2011

...A STRONG THUNDERSTORM WILL AFFECT ALLEGHANY...SURRY AND WILKES
COUNTIES...

AT 510 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 6 MILES EAST OF MC
GRADY...MOVING NORTHEAST AT 35 MPH.

WIND GUSTS TO 30 MPH ARE POSSIBLE WITH THIS STORM. VERY HEAVY RAIN
WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO POND ON ROADS AND
QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

THIS STORM WILL BE NEAR TRAPHILL AROUND 520 PM...ROARING GAP AROUND
530 PM...MOUNTAIN PARK AROUND 540 PM AND LOW GAP AROUND 545 PM.

FOR ADDITIONAL WEATHER INFORMATION...VISIT US ON THE WEB AT
HTTP://WEATHER.GOV.

LAT...LON 3621 8114 3636 8127 3657 8086 3656 8085
      3641 8071

AMS

The radar

The Roanoke radar (KFCX), 103 km away, was scanning. The volume nearest the first event began at 21:19 UTC.

Open the radar archive at this moment

Event by event

5 flood, 3 flash flood, 2 thunderstorm wind, 1 tornado. Local standard time, as filed.

Tornado, Wilkes

When: September 5, 4:20 PM EST to 4:22 PM EST
Where: Wilkes County, 0.89 mi W of Joynes to 1.56 mi NNW of Joynes
Rating: EF1
Path length: 1.32 mi
Path width: 250 yd
Property damage: $850,000
Reported by: State Official
Coordinates: 36.371, -81.086

The tornado touched down just south of the intersection of Longbottom Road and Green Street Mountain Resort Road. From here, it tracked north into Stone Mountain State Park where it destroyed 14 outbuildings, damaged three homes, and uprooted a large oak tree. Damage values are estimated.

Flash Flood, Ashe

When: September 5, 7:00 PM EST to 8:00 PM EST
Where: Ashe County, 7.7 mi SSE of Scottville to 7.66 mi SSE of Scottville
Cause: Heavy Rain
Reported by: Public
Coordinates: 36.392, -81.246

Heavy rain from thunderstorms prompted Cranberry Creek to leave its banks at 14355 Highway 18S near the Stations Inn.

Thunderstorm Wind, Stokes

When: September 5, 9:06 PM EST
Where: Stokes County, 1.69 mi SSE of Campbell
Measured: 50 kt (58 mph) estimated gust
Property damage: $500
Reported by: State Official
Coordinates: 36.507, -80.221

Thunderstorm winds blew a tree down on Moore Road. Damage values are estimated.

Thunderstorm Wind, Stokes

When: September 5, 9:06 PM EST
Where: Stokes County, 0.98 mi NE of Asbury
Measured: 50 kt (58 mph) estimated gust
Property damage: $500
Reported by: State Official
Coordinates: 36.539, -80.417

Thunderstorm winds blew one tree down on Flippin Road. Damage values are estimated.

Flood, Alleghany

When: September 5, 11:00 PM EST to September 6, 2:00 AM EST
Where: Alleghany County, 1.97 mi N of Twin Oaks to 1.95 mi NNW of Twin Oaks
Cause: Heavy Rain
Reported by: State Official
Coordinates: 36.558, -81.177

Prolonged heavy rainfall, totaling around three to four inches, caused a tributary of the New River to flood with water flooding a portion of Farmers Fish Camp Road.

Flood, Alleghany

When: September 5, 11:00 PM EST to September 6, 10:00 PM EST
Where: Alleghany County, 2.46 mi E of Glade Vly to 2.55 mi ENE of Glade Vly
Cause: Heavy Rain
Reported by: State Official
Coordinates: 36.484, -81.006

A period of prolonged heavy rain, totaling three to four inches, produced flooding along Brush Creek with the water crossing Scenic Valley Road.

Flood, Alleghany

When: September 5, 11:00 PM EST to September 6, 2:00 AM EST
Where: Alleghany County, 1.01 mi E of Whitehead to 0.99 mi ENE of Whitehead
Cause: Heavy Rain
Property damage: $10,000
Reported by: State Official
Coordinates: 36.468, -81.132

A prolonged period of heavy rain, totaling three to four inches, produced flooding along the Little River. The flood waters crossed Rifle Range Road. Damage values are estimated.

Flood, Watauga

When: September 6, 7:00 AM EST to 10:00 AM EST
Where: Watauga County, 1.05 mi SSE of Valle Crucis to 1.06 mi SSE of Valle Crucis
Cause: Heavy Rain
Reported by: State Official
Coordinates: 36.207, -81.770

Prolonged heavy rain, totaling three to four inches, produced flooding along Brushy Fork that crossed low water bridges in Valle Crucis.

Flood, Watauga

When: September 6, 7:00 AM EST to 10:00 AM EST
Where: Watauga County, 1.34 mi SSE of Hodges Gap to 1.01 mi NNW of Shulls Mills
Cause: Heavy Rain
Reported by: State Official
Coordinates: 36.204, -81.717

Prolonged heavy rain, totaling three to four inches, caused Laurel Fork to flood some low water crossings near Shulls Mill.

Flash Flood, Watauga

When: September 6, 7:30 AM EST to 10:00 AM EST
Where: Watauga County, 0.47 mi SSW of Boone to 0.36 mi SSE of Perkinsville
Cause: Heavy Rain
Property damage: $750,000
Reported by: Newspaper
Coordinates: 36.214, -81.682

Heavy flashes of rain prompted flash flooding along Kraut/Boone Creek in Boone. Water inundated portions of Appalachian State University and also the parking lot of the Boone Mall. Several cars were flooded up to their windows in the deluge. Two water rescues were required when motorists chose to ignore cones and signs that indicated the Boone Mall parking lot was closed, and their vehicles became stalled in the water. Damage values are estimated.

Flash Flood, Watauga

When: September 6, 9:35 AM EST to 11:35 AM EST
Where: Watauga County, 1.01 mi SE of Valle Crucis to 1.19 mi SE of Valle Crucis
Cause: Heavy Rain
Property damage: $10,000
Reported by: Public
Coordinates: 36.209, -81.769

Heavy rain prompted the Watauga River to leave its banks and cause flash flooding across Dewitt Barnett Road. Damage values are estimated.

What these are

Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Flood: Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in North Carolina in 2011 Every state in 2011 This day in weather history The tornado archive for North Carolina, 2011 Warnings in North Carolina, September 2011

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 347036, 347037, 347049, 347051, 347095, 347097, 347105, 347117, 347119, 347529, 347065.