Alert archive / North Carolina / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 286, NWS Blacksburg, VA

August 22, 2007Yadkin County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 22, 2007, 7:12 PM EDT for Yadkin County, North Carolina. It was in force for 33 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: Aug 22, 2007, 7:12 PM EDT (23:12 UTC)
Expired: Aug 22, 2007, 7:45 PM EDT
In force: 33 min
Issued by: NWS Blacksburg, VA
Area: Counties, with a storm outline in the text

County Yadkin County, NC

The radar

The Roanoke radar (KFCX), 104 km from the middle of the area, began a volume at 23:16 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
Aug 22, 7:27 PM EDT	HAIL 1.75	2 N Huntsville, NC	GOLF BALL HAIL REPORTED ALONG HIGHWAY 421 NEAR THE FORSYTH COUNTY BORDER.

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 one storm report to this severe thunderstorm warning; the first came 15 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 12:00Z, 11.2 hours before the alert went out and 54 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: 340 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 1145 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KRNK 222315
SVRRNK
NCC197-230000-
/O.NEW.KRNK.SV.W.0286.070822T2312Z-070823T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
714 PM EDT WED AUG 22 2007

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS EXTENDED THE

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN YADKIN COUNTY IN NORTHWEST NORTH CAROLINA

* UNTIL 800 PM EDT.

* AT 712 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  HUNTSVILLE...OR ABOUT 7 MILES SOUTH OF EAST BEND...AND MOVING EAST
  AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ENON...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG
BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...AND DEADLY
LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY
FROM WINDOWS UNTIL THE STORM HAS PASSED.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

LARGE HAIL AND...OR STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM.
IN ADDITION...TORRENTIAL RAINS MAY FLOOD LOW LYING AREAS SUCH AS
DITCHES AND UNDERPASSES. DO NOT DRIVE INTO AREAS WHERE WATER COVERS
THE ROAD

PLEASE SEND YOUR REPORTS OF PENNY OR LARGER SIZED HAIL...AS WELL AS
WIND DAMAGE...INCLUDING TREES OR LARGE LIMBS DOWNED BY CALLING THE
NATIONAL WEATHER SERVICE TOLL FREE AT...1...8 6 6...2 1 5...4 3 2 4.

LAT...LON 3610 8046 3611 8048 3609 8049 3603 8050
      3604 8055 3604 8060 3621 8056 3621 8044
TIME...MOT...LOC 2312Z 280DEG 14KT 3611 8047

$$

JH

1 follow-up statement

000 
WWUS51 KRNK 222345
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
744 PM EDT WED AUG 22 2007

NCC197-222354-
/O.CAN.KRNK.SV.W.0286.000000T0000Z-070823T0000Z/
YADKIN NC-
744 PM EDT WED AUG 22 2007

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN YADKIN COUNTY IS
CANCELLED...

THE SEVERE THUNDERSTORM THAT WAS PRODUCING LARGE HAIL OVER EXTREME 
SOUTHEAST YADKIN COUNTY HAS MOVED EAST OF THE AREA. THUS THE WARNING 
IS BEING CANCELLED EARLY.

TO REPORT SEVERE WEATHER...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN BLACKSBURG AT...1 8 6 6...2 1 5...4 3 2 4.

LAT...LON 3610 8046 3611 8048 3609 8049 3603 8050
      3604 8055 3604 8060 3621 8056 3621 8044
TIME...MOT...LOC 2344Z 280DEG 14KT 3609 8032

$$

JH

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 Blacksburg, VA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 22, 3:04 PM EDT, 4 hours 8 minutes earlier.

Area forecast discussion, Aug 22, 3:04 PM EDT, 4 hours 8 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BLACKSBURG VA
304 PM EDT WED AUG 22 2007

.SYNOPSIS...
A WEAK...NEARLY STATIONARY FRONTAL BOUNDARY WILL REMAIN DRAPED ACROSS
THE REGION EXTENDING FROM WESTERN PENNSYLVANIA TO CENTRAL NORTH
CAROLINA. THIS FRONT WILL BE THE FOCUS FOR SCATTERED MAINLY
AFTERNOON AND EVENING THUNDERSTORMS. BY FRIDAY...HIGH PRESSURE
WILL BUILD BACK INTO THE REGION FROM THE SOUTHWEST.
&&

.NEAR TERM /THROUGH THURSDAY/...
UPPER RIDGE IS CENTERED OVER THE MID MS VALLEY WITH NEARLY
STATIONARY...BACKDOOR STYLE FRONT RUNNING NW-SE THROUGH THE MID
ATLANTIC REGION.

UPPER RIDGE WILL BE BUILDING BACK TO THE NORTHEAST TONIGHT AND
WEDNESDAY...PUSHING THE STORM TRACK FURTHER NORTH UP ACROSS THE
GREAT LAKES. THIS ENHANCED UPPER RIDGING WILL STRENGTHEN THE SFC
HIGH WEDGED DOWN THE EAST COAST (NORTH SIDE OF STATIONARY FRONT)
AND IN TURN LIKELY RESULT IN A QUICK RETURN OF LOW CLOUDS DOWN
THE EASTERN SLOPES OF THE BLUE RIDGE THIS EVENING AND OVERNIGHT.
CLOUDS WILL BURN OFF MORE SLOWLY THURSDAY ALSO AND WILL KEEP THE
EAST MORE STABLE. IN THE WEST...EARLY SUN WILL DESTABILIZE THINGS
QUICKER AND WITH DIFFERENTIAL HEATING EXPECT SCATTERED CONVECTION
DURING THE AFTERNOON. THERE WILL BE VERY LITTLE SHORTWAVE ENERGY
TO DEAL WITH AND VERY LIGHT WINDS ALOFT SO STORMS WILL BE MUCH
LESS ORGANIZED THAN WHAT WE HAVE SEEN THE PAST COUPLE DAYS.

&&

.SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY NIGHT/...
LOW LEVEL FLOW BECOMES SOUTHWESTERLY ON FRIDAY WITH FRONTAL
BOUNDARY LIFTING NORTHEAST. HIGH PRESSURE BUILDS OVER THE AREA FOR
THE WEEKEND WITH BUILDING HEIGHTS ALOFT.

ANY LOW LEVEL CLOUD COVER THAT REMAINS ON THE COOL SIDE OF THE
SFC FRONT THURSDAY NIGHT (MAINLY EAST OF BLUE RIDGE) SHOULD DISSIPATE
AS THE FRONT LIFTS NORTHEAST FRIDAY. VERY WARM 85H AIR +19 TO +22
DEG SUPPORTS SFC TEMPS IN THE 90S BOTH FRIDAY AND SATURDAY. MET
GUIDANCE IS RUNNING ABOUT 10 DEG COOLER THAN THE MAV FRIDAY...THE
NAM THINKING THE LOW LEVEL COOL EASTERLY FLOW WILL PERSIST. I
HAVE GONE WITH THE WARMER MAV NUMBERS THINKING FRONT WILL
RETREAT QUICKLY...THE AUGUST SUN DRIVING THE LOW LEVEL COOL WEDGE
OUT BY LATE FRIDAY MORNING.

THE HOT MAV/MEX TEMPS STILL LOOK ON TARGET FOR THE WEEKEND. ANY
THUNDERSTORM ACTIVITY SHOULD BE OF THE AIRMASS VARIETY...OCCURRING
MAINLY DURING THE LATE AFTN/EVE.

&&

.LONG TERM /SUNDAY THROUGH TUESDAY/...
THE GFS HINTS AT A FRONT DROPPING SOUTH THROUGH THE OHIO VALLEY AND
APPROACHING OUR AREA SUNDAY. NOT SURE HOW MUCH PROGRESS THIS
FRONT WILL MAKE GIVEN THE FCST BUILDING RIDGE OF HIGH PRESSURE
ALOFT. FOR NOW WILL MAINTAIN THE MAINLY DIURNAL THREAT OF
SHRA/TSRA WITH LIMITED WETTING POTENTIAL.

TEMPS ARE FCST TO REMAIN VERY WARM...IN ADDITION TO A CONTINUATION
OF 65+ DEGREE DEWPOINTS...I.E. MUGGY.

THE SOUTHEASTERN U.S. RIDGE REMAINS DOMINANT THROUGH THE MIDDLE
OF NEXT WEEK. BEYOND THAT (240 HRS OUT) THE GFS HINTS AT UPPER
RIDGE AMPLIFYING OVER THE WRN CONUS WITH TROF SETTLING OVER THE
EAST. IF THIS VERIFIES...COLD FRONT WILL BRING CHANGE IN TEMPS
TOWARD THE END OF NEXT WEEK.

&&

.AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
TSTM COVERAGE THIS AFTN SHOULD BE MUCH LESS THAN ON TUESDAY. EARLY
MORNING CONVECTION HAS MOSTLY STABILIZED CONDITIONS OVER THE
NORTHERN CWA. THINK THE BULK OF AFTERNOON CONVECTION WILL BE FROM
ABOUT I-77 WEST WHERE CURRENT STORMS ARE LAYING DOWN AN OUTFLOW
BNDRY...AND ALONG THE VA/NC BORDER.

TONIGHT...BELIEVE IFR LOW CLOUDS/FOG WILL FILL BACK IN OVER THE
EAST...ON THE COOL SIDE OF THE NORTH/SOUTH RUNNING STATIONARY
FRONT...AS IT SPLITS THE CWA IN HALF.

THURSDAY...AFTN CONVECTION WILL CONCETRATE MAINLY IN THE MTNS AS
EAST SLOWLY BURNS OFF IT CLOUD DECK.

MORE TYPICAL SUMMERTIME PATTERN REDEVELOPS FRIDAY AND INTO THE
WEENEND AS UPPER RIDGE BUILDS NORTHEAST INTO THE MID-ATLANTIC.

&&

.RNK WATCHES/WARNINGS/ADVISORIES...
VA...NONE.
NC...NONE.
WV...NONE.

&&

SYNOPSIS...PM
NEAR TERM...JS
SHORT TERM...PM
LONG TERM...PM
AVIATION...JS

Hazardous weather outlook, Aug 22, 4:44 AM EDT, 14 hours 28 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
444 AM EDT WED AUG 22 2007

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>045-231000-
ASHE-ALLEGHANY NC-SURRY-STOKES-ROCKINGHAM-CASWELL-WATAUGA-WILKES-
YADKIN-TAZEWELL-SMYTH-BLAND-GILES-WYTHE-PULASKI-MONTGOMERY-GRAYSON-
CARROLL-FLOYD-CRAIG-ALLEGHANY VA-BATH-ROANOKE-BOTETOURT-ROCKBRIDGE-
PATRICK-FRANKLIN-BEDFORD-AMHERST-HENRY-PITTSYLVANIA-CAMPBELL-
APPOMATTOX-BUCKINGHAM-HALIFAX-CHARLOTTE-MERCER-SUMMERS-MONROE-
GREENBRIER-
444 AM EDT WED AUG 22 2007

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND EVENING ALONG
AND SOUTH OF A NEARLY STATIONARY FRONT THAT EXTENDS FROM THE ALLEGHANY
HIGHLANDS OF VIRGINIA...SOUTHEAST INTO THE VIRGINIA PIEDMONT. THE
AIRMASS WILL BE UNSTABLE ENOUGH FOR A FEW OF THE STORMS TO PRODUCE
DAMAGING WIND GUSTS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON OR EVENING.

In the hours before

Special weather statement, Aug 22, 1:39 PM EDT, 5 hours 33 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
139 PM EDT WED AUG 22 2007

NCZ006-VAZ044-221845-
CASWELL NC-PITTSYLVANIA VA-
139 PM EDT WED AUG 22 2007

...STRONG THUNDERSTORM MOVING THROUGH SOUTHERN PITTSYLVANIA COUNTY...

AT 137 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 8 MILES EAST OF AXTON...OR ABOUT 7 MILES SOUTH OF
SWANSONVILLE...MOVING SOUTHEAST AT 25 MPH.

THE STRONG THUNDERSTORM WILL BE NEAR...WESTOVER HILLS AT 150 PM
EDT...DANVILLE CITY AT 155 PM EDT...PELHAM AT 200 PM
EDT...GATEWOOD...DANVILLE AIRPORT AT 205 PM EDT...PROVIDENCE AT 210
PM EDT...BLANCH AT 215 PM EDT...

WIND GUSTS TO 40 MPH...AND CLOUD TO GROUND LIGHTNING ARE POSSIBLE
WITH THIS STORM.

LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR
UPDATES ON THIS DEVELOPING SITUATION.

PH

Special weather statement, Aug 22, 1:57 PM EDT, 5 hours 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
157 PM EDT WED AUG 22 2007

NCZ004-005-VAZ032-221900-
ROCKINGHAM NC-STOKES NC-PATRICK VA-
157 PM EDT WED AUG 22 2007

...STRONG THUNDERSTORMS MOVING THROUGH STOKES AND ROCKINGHAM
COUNTIES...

AT 156 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM ALONG A LINE EXTENDING FROM 5 MILES SOUTHWEST OF
RIDGEWAY TO 4 MILES EAST OF SANDY RIDGE TO 4 MILES NORTH OF
FRANCISCO...MOVING SOUTHEAST AT 15 MPH.

STRONG THUNDERSTORMS WILL BE NEAR...PRESTONVILLE AT 210 PM
EDT...STONEVILLE...LAWSONVILLE AT 215 PM EDT...MAYODAN...MAYODAN AT
220 PM EDT...MADISON...DILLARD AT 230 PM
EDT...INTELLIGENCE...DANBURY AT 235 PM EDT...WENTWORTH AT 240 PM
EDT...

WIND GUSTS TO 40 MPH...AND CLOUD TO GROUND LIGHTNING ARE POSSIBLE
WITH THIS STORM.

LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR
UPDATES ON THIS DEVELOPING SITUATION.

PH

Local storm report, Aug 22, 3:06 PM EDT, 4 hours 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
306 PM EDT WED AUG 22 2007

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

0235 PM     HAIL             2 NW ELLISBORO          36.35N 80.01W
08/22/2007  E0.75 INCH       ROCKINGHAM         NC   PUBLIC

            HAIL LASTED 3 TO 5 MINUTES.

&&

HYSELL

Local storm report, Aug 22, 3:25 PM EDT, 3 hours 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
325 PM EDT WED AUG 22 2007

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

0305 PM     HAIL             2 S WALNUT COVE         36.27N 80.14W
08/22/2007  E0.75 INCH       STOKES             NC   PUBLIC

&&

HYSELL

Special weather statement, Aug 22, 4:56 PM EDT, 2 hours 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
456 PM EDT WED AUG 22 2007

NCZ003-VAZ016-222145-
SURRY NC-CARROLL VA-
456 PM EDT WED AUG 22 2007

AT 454 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 4 MILES SOUTH OF FANCY GAP...OR ABOUT 4 MILES
NORTHEAST OF LAMBSBURG...MOVING SOUTH AT 5 MPH. THE STRONG
THUNDERSTORM WILL CONTINUE TO DRIFT SOUTH ALONG INTERSTATE 77 OVER
THE NEXT 30 MINUTES TO AN HOUR AS IT PUSHES INTO NORTHERN SURRY
COUNTY NORTH CAROLINA.

EXPECT SMALL HAIL AND FREQUENT DANGEROUS LIGHTNING IN THE PATH OF
THIS STORM. RAINFALL RATES OF UP TO AN INCH AN HOUR WILL LIKELY
CAUSE PONDING OF WATER ALONG WITH FLOODING OF POOR DRAINAGE AREAS.

LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA OUTLET FOR
UPDATES ON THIS SITUATION.

Local storm report, Aug 22, 7:03 PM EDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BLACKSBURG VA
703 PM EDT WED AUG 22 2007

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

0645 PM     HAIL             YADKINVILLE             36.13N 80.66W
08/22/2007  E1.00 INCH       YADKIN             NC   TRAINED SPOTTER

            QUARTER SIZE HAIL COVERING THE GROUND IN YADKINVILLE.

&&

JH

The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 22, 2:02 PM EDT	Severe Thunderstorm Warning	RNK	Stokes	73 min
Aug 22, 2:14 PM EDT	Severe Thunderstorm Warning	RNK	Rockingham	61 min
Aug 22, 5:40 PM EDT	Areal Flood Advisory	RNK	Surry	2 hr
Aug 22, 6:23 PM EDT	Severe Thunderstorm Warning	RNK	Yadkin	52 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2007 Every 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.