Alert archive / North Carolina / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 285, NWS Blacksburg, VA

July 21, 2012Caswell County, Rockingham County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 21, 2012, 5:40 PM EDT for Caswell County, Rockingham County, North Carolina. It was in force for 65 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: Jul 21, 2012, 5:40 PM EDT (21:40 UTC)
Expired: Jul 21, 2012, 6:45 PM EDT
In force: 65 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

Counties Caswell County, NC, Rockingham County, NC

The radar

The Roanoke radar (KFCX), 109 km from the middle of the area, began a volume at 21:43 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
Jul 21, 6:10 PM EDT	TSTM WND DMG	1 N Jericho, NC	THE CASWELL COUNTY SHERIFFS OFFICE REPORTED A TREE BLOWN DOWN ALONG HIGHWAY 62 NEAR THE COMMUNITY OF JERICHO.
Jul 21, 6:20 PM EDT	TSTM WND DMG	7 Sse Reidsville, NC	TWO TREES BLOWN DOWN NEAR CANDY CREEK 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, 9.7 hours before the alert went out and 46 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: 679 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 870 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 69 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.

194 
WUUS51 KRNK 212140
SVRRNK
NCC033-157-212245-
/O.NEW.KRNK.SV.W.0285.120721T2140Z-120721T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
540 PM EDT SAT JUL 21 2012

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CASWELL COUNTY IN NORTH CENTRAL NORTH CAROLINA
  SOUTHEASTERN ROCKINGHAM COUNTY IN NORTH CENTRAL NORTH CAROLINA

* UNTIL 645 PM EDT.

* AT 538 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 7 MILES NORTH OF QUICK TO 16 MILES NORTHWEST OF MONROETON...OR
  ALONG A LINE EXTENDING FROM MAYFIELD TO MADISON...AND MOVING
  SOUTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  QUICK...
  MONROETON...
  CAMP SPRINGS...
  JERICHO...
  BAYNES...

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.

INTENSE RAIN AND STRONG DAMAGING WINDS ARE LIKELY FROM THIS STORM.
TAKE COVER IN A STURDY STRUCTURE UNTIL THE STORM PASSES.

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 7988 3652 7932 3638 7938 3627 7915
      3625 7915 3624 7916 3625 7953 3624 7954
      3624 7963
TIME...MOT...LOC 2139Z 330DEG 13KT 3649 7947 3637 7999

$$

JH

2 follow-up statements

076 
WWUS51 KRNK 212221
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
621 PM EDT SAT JUL 21 2012

NCC033-157-212245-
/O.CON.KRNK.SV.W.0285.000000T0000Z-120721T2245Z/
CASWELL NC-ROCKINGHAM NC-
621 PM EDT SAT JUL 21 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR SOUTHERN CASWELL AND SOUTHEASTERN ROCKINGHAM COUNTIES...

AT 620 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM JERICHO TO 10 MILES WEST OF MONROETON...OR ALONG A
LINE EXTENDING FROM YANCEYVILLE TO 9 MILES EAST OF BELEWS CREEK...
MOVING SOUTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  MONROETON...
  CAMP SPRINGS...
  JERICHO...
  BAYNES...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THEIR PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS AND DEADLY CLOUD TO GROUND LIGHTNING. 
PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG 
BUILDING BUT AWAY FROM WINDOWS.

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 7988 3629 7979 3638 7938 3627 7915
      3625 7915 3624 7916 3625 7953 3624 7954
      3624 7963
TIME...MOT...LOC 2221Z 330DEG 13KT 3636 7938 3624 7990

$$

16

920 
WWUS51 KRNK 212245
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
645 PM EDT SAT JUL 21 2012

NCC033-157-212255-
/O.EXP.KRNK.SV.W.0285.000000T0000Z-120721T2245Z/
CASWELL NC-ROCKINGHAM NC-
645 PM EDT SAT JUL 21 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CASWELL AND
SOUTHEASTERN ROCKINGHAM COUNTIES EXPIRES AT 645 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. ONCE AGAIN
THAT NUMBER IS 1...8 6 6...2 1 5...4 3 2 4.

LAT...LON 3625 7988 3629 7979 3638 7938 3627 7915
      3625 7915 3624 7916 3625 7953 3624 7954
      3624 7963
TIME...MOT...LOC 2245Z 330DEG 13KT 3628 7933 3616 7985

$$

16

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 1:47 PM EDT	Special Weather Statement	RNK	Person	43 min
Jul 21, 2:06 PM EDT	Areal Flood Advisory	RNK	Caswell	3 hr
Jul 21, 3:33 PM EDT	Special Weather Statement	RNK	Caswell	57 min
Jul 21, 4:40 PM EDT	Special Weather Statement	RNK	Rockingham	65 min
Jul 21, 5:04 PM EDT	Severe Thunderstorm Warning	RNK	Caswell, Rockingham	56 min
Jul 21, 5:15 PM EDT	Severe Thunderstorm Warning	RNK	Caswell	60 min
Jul 21, 5:37 PM EDT	Flash Flood Warning	RNK	Caswell	4 hr

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.