Alert archive / North Carolina / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 99, NWS Blacksburg, VA

May 15, 2012Stokes County, Surry County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at May 15, 2012, 6:29 PM EDT for Stokes County, Surry County, North Carolina. It was in force for 33 min. 2 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
May 15, 2012, 6:29 PM EDT (22:29 UTC)
Expired
May 15, 2012, 7:02 PM EDT
In force
33 min
Issued by
NWS Blacksburg, VA
Area
Storm-based polygon

Counties Stokes County, NC, Surry County, NC

The radar

The Roanoke radar (KFCX), 62 km from the middle of the area, began a volume at 22:29 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
May 15, 6:30 PM EDTHAIL 0.881 Nw Mount Airy, NCDIME TO NICKEL SIZE HAIL ON HICKORY STREET.
May 15, 6:33 PM EDTHAIL 0.56 Sw Ararat, NCPEA TO MARBLE SIZE HAIL ON CROSSINGHAM ROAD

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 12:00Z, 10.5 hours before the alert went out and 68 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 12:00Z on 2012-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 24 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2012-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.19395878Sfc1 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
24 J/kg
Mixed-layer CIN
-114 J/kg
Mixed-layer LCL
532 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

594 
WUUS51 KRNK 152229
SVRRNK
NCC169-171-152330-
/O.NEW.KRNK.SV.W.0099.120515T2229Z-120515T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
629 PM EDT TUE MAY 15 2012

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN STOKES COUNTY IN NORTH CENTRAL NORTH CAROLINA
  NORTHEASTERN SURRY COUNTY IN NORTH CENTRAL NORTH CAROLINA

* UNTIL 730 PM EDT.

* AT 624 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
  MOUNT AIRY...AND MOVING EAST AT 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MOUNT AIRY...
  FLAT ROCK...
  WOODVILLE...
  WESTFIELD...
  FRANCISCO...

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 CAUSING LOCALIZED FLOODING.

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 3654 8026 3639 8027 3641 8054 3646 8063
      3651 8067 3655 8064
TIME...MOT...LOC 2229Z 271DEG 9KT 3652 8061

$$

WERT
2 follow-up statements
694 
WWUS51 KRNK 152247
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
647 PM EDT TUE MAY 15 2012

NCC169-171-152330-
/O.CON.KRNK.SV.W.0099.000000T0000Z-120515T2330Z/
STOKES NC-SURRY NC-
647 PM EDT TUE MAY 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTHWESTERN STOKES AND NORTHEASTERN SURRY COUNTIES...

AT 643 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR FLAT ROCK...OR NEAR ARARAT...MOVING EAST AT 10 MPH.

LOCATIONS IMPACTED INCLUDE...
  FLAT ROCK...
  WOODVILLE...
  WESTFIELD...
  COLLINSTOWN...

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 3654 8026 3639 8027 3641 8054 3646 8063
      3651 8067 3655 8064
TIME...MOT...LOC 2247Z 271DEG 10KT 3654 8052

$$

WERT
268 
WWUS51 KRNK 152302
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
702 PM EDT TUE MAY 15 2012

NCC169-171-152312-
/O.CAN.KRNK.SV.W.0099.000000T0000Z-120515T2330Z/
STOKES NC-SURRY NC-
702 PM EDT TUE MAY 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN STOKES AND
NORTHEASTERN SURRY 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 3654 8026 3639 8027 3641 8054 3646 8063
      3651 8067 3655 8064
TIME...MOT...LOC 2302Z 271DEG 10KT 3654 8047

$$

WERT

The office that day

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

IssuedProductOfficeCountiesLasted
May 14, 8:16 PM EDTSpecial Weather StatementRNKAshe29 min
May 15, 5:39 AM EDTFlash Flood WatchRNKAlleghany, Ashe, Stokes, Surry, Watauga, Wilkes and 1 more17 hr
May 15, 6:19 AM EDTDense Fog AdvisoryRNKAlleghany, Ashe, Surry, Watauga, Wilkes, Yadkin4 hr
May 15, 3:38 PM EDTSpecial Weather StatementRNKAlleghany52 min
May 15, 3:46 PM EDTSpecial Weather StatementRNKWatauga59 min
May 15, 4:57 PM EDTFlash Flood WarningRNKAlleghany, Ashe5 hr
May 15, 5:27 PM EDTFlash Flood WarningRNKAshe, Watauga4 hr
May 15, 5:32 PM EDTSpecial Weather StatementRNKSurry58 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2012Every 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.