Alert archive / North Carolina / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 252, NWS Blacksburg, VA

August 20, 2009Stokes County, Surry County, North Carolina; Patrick County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 20, 2009, 7:11 PM EDT for Stokes County, Surry County, North Carolina; Patrick County, Virginia. It was in force for 64 min. 3 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 20, 2009, 7:11 PM EDT (23:11 UTC)
Expired: Aug 20, 2009, 8:15 PM EDT
In force: 64 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Stokes County, NC, Surry County, NC, Patrick County, VA

The radar

The Roanoke radar (KFCX), 54 km from the middle of the area, began a volume at 23:11 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 20, 7:32 PM EDT	TSTM WND DMG	White Plains, NC	MULTIPLE TREES DOWN IN TOWN
Aug 20, 7:33 PM EDT	TSTM WND DMG	Ararat, NC	MULTIPLE TREES DOWN IN TOWN
Aug 20, 7:33 PM EDT	NON-TSTM WND DMG	Ararat, NC	MULTIPLE TREES DOWN IN TOWN

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, 11.2 hours before the alert went out and 78 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: 1782 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 576 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KRNK 202311
SVRRNK
NCC169-171-VAC141-210015-
/O.NEW.KRNK.SV.W.0252.090820T2311Z-090821T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
711 PM EDT THU AUG 20 2009

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN STOKES COUNTY IN NORTH CENTRAL NORTH CAROLINA
  SURRY COUNTY IN NORTH CENTRAL NORTH CAROLINA
  WESTERN PATRICK COUNTY IN SOUTHWEST VIRGINIA

* UNTIL 815 PM EDT.

* AT 711 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR LEVEL CROSS...OR NEAR DOBSON...AND MOVING
  NORTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  LEVEL CROSS...
  WHITE PLAINS...
  WOODVILLE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

WHEN IT IS SAFE TO DO SO...PLEASE SEND YOUR REPORTS OF PENNY OR
LARGER SIZED HAIL...AS WELL AS WIND DAMAGE...INCLUDING TREES OR 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 8066 3638 8081 3656 8063 3656 8061
      3665 8053 3665 8051 3668 8046 3673 8045
      3674 8043 3674 8040 3678 8038 3659 8015
TIME...MOT...LOC 2311Z 225DEG 18KT 3638 8066

$$

2 follow-up statements

000 
WWUS51 KRNK 202335
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
735 PM EDT THU AUG 20 2009

NCC169-171-VAC141-210015-
/O.CON.KRNK.SV.W.0252.000000T0000Z-090821T0015Z/
STOKES NC-SURRY NC-PATRICK VA-
735 PM EDT THU AUG 20 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR WESTERN PATRICK...EASTERN SURRY AND NORTHWESTERN STOKES
COUNTIES...

AT 733 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.
 THIS STORM WAS LOCATED NEAR WESTFIELD...OR NEAR MOUNT AIRY...MOVING
NORTHEAST AT 20 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

HAIL UP TO NICKEL SIZED HAS BEEN REPORTED IN DOBSON AT 7:10 PM WITH 
THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE 
ACTION TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 3641 8077 3656 8063 3656 8061 3665 8053
      3665 8050 3668 8046 3673 8045 3674 8040
      3678 8038 3659 8015 3630 8059
TIME...MOT...LOC 2335Z 225DEG 18KT 3647 8055

$$

KK

000 
WWUS51 KRNK 210007
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
807 PM EDT THU AUG 20 2009

NCC169-171-VAC141-210017-
/O.EXP.KRNK.SV.W.0252.000000T0000Z-090821T0015Z/
STOKES NC-SURRY NC-PATRICK VA-
807 PM EDT THU AUG 20 2009

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN PATRICK...EASTERN
SURRY AND NORTHWESTERN STOKES COUNTIES EXPIRES AT 815 PM EDT...

THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED BELOW
SEVERE LIMITS. THUS THE WARNING WILL BE ALLOWED TO EXPIRE.

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 3641 8077 3656 8063 3656 8061 3665 8053
      3665 8050 3668 8046 3673 8045 3674 8040
      3678 8038 3659 8015 3630 8059
TIME...MOT...LOC 0007Z 225DEG 18KT 3658 8041

$$

KK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 8:06 PM EDT	Flash Flood Warning	RNK	Watauga, Wilkes	4 hr
Aug 19, 9:09 PM EDT	Special Weather Statement	RNK	Stokes, Surry, Yadkin	51 min
Aug 20, 1:35 PM EDT	Special Weather Statement	RNK	Caswell	40 min
Aug 20, 3:00 PM EDT	Special Weather Statement	RNK	Surry	60 min
Aug 20, 3:41 PM EDT	Severe Thunderstorm Warning	RNK	Stokes, Surry	41 min
Aug 20, 4:33 PM EDT	Special Weather Statement	RNK	Surry	57 min
Aug 20, 5:34 PM EDT	Flash Flood Warning	RNK	Ashe	6 hr
Aug 20, 5:38 PM EDT	Special Weather Statement	RNK	Surry	67 min
Aug 20, 6:44 PM EDT	Special Weather Statement	RNK	Stokes, Surry	61 min
Aug 20, 1:33 PM EDT	Special Weather Statement	RNK	Carroll, City of Galax	27 min
Aug 20, 1:53 PM EDT	Special Weather Statement	RNK	Rockbridge, City of Lexington	52 min
Aug 20, 2:22 PM EDT	Special Weather Statement	RNK	Bedford	68 min
Aug 20, 2:27 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Franklin, Roanoke	63 min
Aug 20, 2:33 PM EDT	Special Weather Statement	RNK	Montgomery, City of Radford	57 min
Aug 20, 3:49 PM EDT	Special Weather Statement	RNK	City of Lynchburg	56 min
Aug 20, 3:52 PM EDT	Special Weather Statement	RNK	City of Roanoke, City of Salem	53 min
Aug 20, 4:38 PM EDT	Special Weather Statement	RNK	Alleghany, Bath, Rockbridge, City of Covington, City of Lexington	52 min
Aug 20, 4:45 PM EDT	Special Weather Statement	RNK	Buckingham	60 min
Aug 20, 5:01 PM EDT	Special Weather Statement	RNK	Pulaski, Wythe	59 min
Aug 20, 5:20 PM EDT	Flash Flood Warning	RNK	Wythe	3 hr
Aug 20, 6:23 PM EDT	Special Weather Statement	RNK	Botetourt, City of Roanoke, City of Salem	67 min
Aug 20, 6:27 PM EDT	Special Weather Statement	RNK	Amherst	63 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2009 Severe Thunderstorm Warnings in Virginia, 2009 Every severe thunderstorm warning in 2009

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.