Alert archive / North Carolina / Tornado Warnings in 2011

Tornado Warning 5, NWS Blacksburg, VA

April 5, 2011Caswell County, North Carolina

NWS Blacksburg, VA issued this tornado warning at Apr 5, 2011, 3:12 AM EDT for Caswell County, North Carolina. It was in force for 14 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: Apr 5, 2011, 3:12 AM EDT (07:12 UTC)
Expired: Apr 5, 2011, 3:26 AM EDT
In force: 14 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

County Caswell County, NC

The radar

The Raleigh/Durham radar (KRAX), 101 km from the middle of the area, began a volume at 07:11 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
Apr 5, 3:15 AM EDT	TSTM WND DMG	4 N Jericho, NC	ROOF BLOWN OFF A HOUSE ON MARSHALL GRAVES ROAD. TIME ESTIMATED FROM RADAR.
Apr 5, 3:18 AM EDT	TSTM WND DMG	4 S Yanceyville, NC	TREE DOWN ON OAK VIEW LOOP ROAD.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 5, 2:18 AM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 7.2 hours before the alert went out and 61 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2364 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 144 m²/s²
0-3 km storm-relative helicity: 291 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.

798 
WFUS51 KRNK 050712
TORRNK
NCC033-050800-
/O.NEW.KRNK.TO.W.0005.110405T0712Z-110405T0800Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
312 AM EDT TUE APR 5 2011

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN CASWELL COUNTY IN NORTH CENTRAL NORTH CAROLINA

* UNTIL 400 AM EDT.

* AT 307 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES SOUTH OF
  CAMP SPRINGS...MOVING NORTHEAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CAMP SPRINGS...
  JERICHO...
  BAYNES...
  PROSPECT HILL...
  LEASBURG...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
QUARTER SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

WHEN IT IS SAFE TO DO SO...PLEASE RELAY YOUR SEVERE WEATHER REPORTS
TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE AT...1...8 6
6...2 1 5...4 3 2 4.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 AM EDT TUESDAY MORNING
FOR NORTH CENTRAL NORTH CAROLINA AND SOUTHWESTERN VIRGINIA.

&&

LAT...LON 3625 7951 3630 7953 3647 7914 3646 7913
      3629 7914 3625 7915 3624 7916
TIME...MOT...LOC 0712Z 247DEG 47KT 3623 7938

$$

1 follow-up statement

420 
WWUS51 KRNK 050726
SVSRNK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
326 AM EDT TUE APR 5 2011

NCC033-050737-
/O.CAN.KRNK.TO.W.0005.000000T0000Z-110405T0800Z/
CASWELL NC-
326 AM EDT TUE APR 5 2011

...THE TORNADO WARNING FOR SOUTHERN CASWELL COUNTY IS CANCELLED...

THE TORNADO THREAT FOR THE WARNED AREA HAS ENDED. THE THUNDERSTORM
PRODUCING THE TORNADO HAS WEAKENED AND MOVED OUT OF THE WARNING AREA.

STAY TUNED TO NOAA WEATHER RADIO...TV OR YOUR LOCAL NEW SOURCE FOR
THE LATEST WEATHER INFORMATION. REPORT ANY SEVERE WEATHER OR STORM
RELATED DAMAGE TO LOCAL LAW ENFORCEMENT OFFICIALS AND ASK THEM TO
IMMEDIATELY RELAY THE REPORT TO THE NATIONAL WEATHER SERVICE IN
BLACKSBURG.

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 AM EDT TUESDAY MORNING
FOR NORTH CENTRAL NORTH CAROLINA AND SOUTHWESTERN VIRGINIA.

LAT...LON 3625 7951 3630 7953 3647 7914 3646 7913
      3629 7914 3625 7915 3624 7916
TIME...MOT...LOC 0727Z 247DEG 47KT 3630 7915

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 11:46 PM EDT	Special Weather Statement	RNK	Ashe, Watauga	44 min
Apr 5, 12:02 AM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Ashe, Watauga, Wilkes	58 min
Apr 5, 12:45 AM EDT	Severe Thunderstorm Warning	RNK	Stokes, Surry, Wilkes, Yadkin	75 min
Apr 5, 2:06 AM EDT	Severe Thunderstorm Warning	RNK	Caswell, Rockingham, Stokes	54 min
Apr 5, 2:58 AM EDT	Severe Thunderstorm Warning	RNK	Caswell, Rockingham	62 min
Apr 5, 4:38 AM EDT	Frost Advisory	RNK	Caswell, Rockingham, Stokes, Surry, Wilkes, Yadkin	28 hr

Nearby

Tornado Warnings in North Carolina, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.