Alert archive / North Carolina / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 337, NWS Blacksburg, VA

August 11, 2012Watauga County, Wilkes County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 11, 2012, 5:17 AM EDT for Watauga County, Wilkes County, North Carolina. It was in force for 36 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 11, 2012, 5:17 AM EDT (09:17 UTC)
Expired: Aug 11, 2012, 5:53 AM EDT
In force: 36 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Watauga County, NC, Wilkes County, NC

The radar

The Roanoke radar (KFCX), 152 km from the middle of the area, began a volume at 09:18 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 11, 5:30 AM EDT	TSTM WND DMG	2 Nw Blowing Rock, NC	TREE DOWN ON SHULLS MILL ROAD OFF RT 221

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 9.3 hours before the alert went out and 151 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.

606 
WUUS51 KRNK 110917
SVRRNK
NCC189-193-111015-
/O.NEW.KRNK.SV.W.0337.120811T0917Z-120811T1015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
517 AM EDT SAT AUG 11 2012

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN WATAUGA COUNTY IN NORTHWEST NORTH CAROLINA
  WESTERN WILKES COUNTY IN NORTHWEST NORTH CAROLINA

* UNTIL 615 AM EDT.

* AT 514 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED
  NEAR GRANDFATHER MOUNTAIN...OR 6 MILES WEST OF BLOWING ROCK...AND
  MOVING EAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BLOWING ROCK...
  AHO...
  MAPLE SPRINGS...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER.

REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...
DAMAGING WINDS IN EXCESS OF 55 MPH...DEADLY LIGHTNING...AND VERY
HEAVY RAIN.

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.

WHEN IT IS SAFE TO DO SO...PLEASE SEND YOUR REPORTS OF QUARTER 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 3625 8150 3613 8130 3609 8148 3609 8152
      3611 8155 3612 8171 3611 8181 3618 8185
TIME...MOT...LOC 0917Z 250DEG 29KT 3612 8174

$$

JH

2 follow-up statements

274 
WWUS51 KRNK 110934
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
534 AM EDT SAT AUG 11 2012

NCC189-193-111015-
/O.CON.KRNK.SV.W.0337.000000T0000Z-120811T1015Z/
WATAUGA NC-WILKES NC-
534 AM EDT SAT AUG 11 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 AM EDT
FOR SOUTHERN WATAUGA AND WESTERN WILKES COUNTIES...

AT 531 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED NEAR AHO...OR NEAR BLOWING ROCK...MOVING EAST AT 35 MPH. 
ANOTHER DEVELOPING THUNDERSTORM TO THE SOUTHWEST OF THE WARNED AREA 
MAY AFFECT LOCATIONS ACROSS SOUTHERN WATAUGA COUNTY AROUND 600 AM.

LOCATIONS IMPACTED INCLUDE...
  AHO...
  DARBY...
  DEEP GAP...
  MAPLE SPRINGS...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER.
REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...
DAMAGING WINDS IN EXCESS OF 55 MPH...DEADLY LIGHTNING...AND VERY
HEAVY RAIN.

TO REPORT SEVERE WEATHER...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN BLACKSBURG AT...1...8 6 6...2 1 5...4 3 2 4...WHEN YOU CAN
DO SO SAFELY. ONCE AGAIN THAT NUMBER IS 1...8 6 6...2 1 5...4 3 2 4.

&&

LAT...LON 3625 8150 3613 8130 3609 8148 3609 8152
      3611 8155 3612 8171 3611 8181 3618 8185
TIME...MOT...LOC 0933Z 250DEG 29KT 3615 8162

$$

JH

327 
WWUS51 KRNK 110953
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
553 AM EDT SAT AUG 11 2012

NCC189-193-111004-
/O.CAN.KRNK.SV.W.0337.000000T0000Z-120811T1015Z/
WATAUGA NC-WILKES NC-
553 AM EDT SAT AUG 11 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WATAUGA AND WESTERN
WILKES COUNTIES IS CANCELLED...

THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND
EXITED THE WARNED AREA. THEREFORE...THE WARNING HAS BEEN CANCELLED.

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 3625 8150 3613 8130 3609 8148 3609 8152
      3611 8155 3612 8171 3611 8181 3618 8185
TIME...MOT...LOC 0954Z 250DEG 29KT 3621 8142

$$

JH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 9:17 PM EDT	Special Weather Statement	RNK	Wilkes	43 min
Aug 10, 9:48 PM EDT	Areal Flood Advisory	RNK	Wilkes	3 hr
Aug 10, 10:23 PM EDT	Special Weather Statement	RNK	Surry, Wilkes	37 min
Aug 10, 10:48 PM EDT	Special Weather Statement	RNK	Yadkin	27 min
Aug 11, 12:30 AM EDT	Special Weather Statement	RNK	Stokes, Yadkin	60 min
Aug 11, 1:14 AM EDT	Areal Flood Advisory	RNK	Stokes, Surry, Yadkin	4 hr
Aug 11, 5:01 AM EDT	Special Weather Statement	RNK	Wilkes	59 min
Aug 11, 5:14 AM EDT	Special Weather Statement	RNK	Caswell	61 min
Aug 11, 1:30 PM EDT	Special Weather Statement	RNK	Caswell	30 min
Aug 11, 2:08 PM EDT	Special Weather Statement	RNK	Caswell	52 min
Aug 11, 6:05 PM EDT	Special Weather Statement	RNK	Rockingham	25 min
Aug 11, 6:34 PM EDT	Severe Thunderstorm Warning	RNK	Rockingham, Stokes	41 min
Aug 11, 7:24 PM EDT	Severe Thunderstorm Warning	RNK	Rockingham	37 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2012 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.