Alert archive / North Carolina / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Raleigh, NC

April 5, 20114 counties in North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Apr 5, 2011, 3:15 AM EDT for 4 counties in North Carolina. It was in force for 45 min. 5 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, 3:15 AM EDT (07:15 UTC)
Expired: Apr 5, 2011, 4:00 AM EDT
In force: 45 min
Issued by: NWS Raleigh, NC
Area: Storm-based polygon

Counties Alamance County, NC, Durham County, NC, Orange County, NC, Person County, NC

The radar

The Raleigh/Durham radar (KRAX), 65 km from the middle of the area, began a volume at 07:16 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, 3:30 AM EDT	TSTM WND DMG	1 Sw Roxboro, NC	TREE DOWN NEAR LEESBURG RRD AND CHUB LAKE ST IN ROXBORO
Apr 5, 3:36 AM EDT	TSTM WND DMG	3 Nnw Durham, NC	ONE TREE ON HOUSE ON CAROLINA AVE IN DURHAM.
Apr 5, 3:40 AM EDT	TSTM WND DMG	2 N Durham, NC	LARGE WILLOW OAK TREES ON TWO HOUSES AT N. BUCHANAN AND WEST KNOX ST
Apr 5, 3:40 AM EDT	TSTM WND DMG	4 Wnw Durham, NC	TREE DOWN ON NC 751 NEAR WILDBERRY ROAD.
Apr 5, 3:40 AM EDT	TSTM WND DMG	5 W Bethel Hill, NC	TREE DOWN ON 5000 BLOCK OF WOODSDALE RD... NORTH OF ROXBORO.

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, 12:48 AM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 7.3 hours before the alert went out and 81 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.

476 
WUUS52 KRAH 050715
SVRRAH
NCC001-063-135-145-050800-
/O.NEW.KRAH.SV.W.0021.110405T0715Z-110405T0800Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RALEIGH NC
315 AM EDT TUE APR 5 2011

THE NATIONAL WEATHER SERVICE IN RALEIGH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DURHAM COUNTY IN CENTRAL NORTH CAROLINA
  ORANGE COUNTY IN CENTRAL NORTH CAROLINA
  EASTERN ALAMANCE COUNTY IN CENTRAL NORTH CAROLINA
  PERSON COUNTY IN CENTRAL NORTH CAROLINA

* UNTIL 400 AM EDT

* AT 311 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 21 MILES NORTH OF
  UNION RIDGE TO HAW RIVER TO 15 MILES SOUTH OF SNOW CAMP...OR ALONG
  A LINE EXTENDING FROM PROVIDENCE TO GRAHAM TO SILER CITY...MOVING
  EAST AT 60 MPH. WINDS IN EXCESS OF 58 MPH ARE LIKELY WITH THIS
  STORM.

* LOCATIONS IMPACTED INCLUDE...
  TEER...EFLAND...
  SCHLEY...HILLSBOROUGH...
  CHAPEL HILL...CARRBORO...
  ROXBORO...ROUGEMONT...
  SURL...PARKWOOD...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STRAIGHT LINE WINDS CAN BLOW DOWN TREES...POWER LINES...AND DAMAGE
MOBILE HOMES AND OTHER BUILDINGS. SEEK SHELTER IN A STURDY STRUCTURE
UNTIL THE STORM HAS PASSED. STAY AWAY FROM WINDOWS AS FLYING DEBRIS
GENERATED BY DAMAGING WINDS CAN BE DEADLY.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. BE PREPARED TO MOVE QUICKLY TO AN INTERIOR ROOM OF A SAFE
SHELTER IF YOU HEAR OR SEE A TORNADO.

PLEASE REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE BY
CALLING...1...8 7 7...6 3 3...6 7 7 2 OR NOTIFY YOUR LOCAL LAW
ENFORCEMENT AGENCY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 AM EDT TUESDAY MORNING
FOR CENTRAL NORTH CAROLINA.

&&

LAT...LON 3655 7880 3610 7881 3605 7875 3601 7875
      3602 7871 3597 7871 3591 7876 3592 7881
      3586 7883 3585 7911 3587 7925 3586 7924
      3584 7948 3608 7939 3625 7944 3624 7916
      3655 7914
TIME...MOT...LOC 0715Z 262DEG 53KT 3652 7938 3609 7927
          3567 7943

$$

ELLIS

3 follow-up statements

422 
WWUS52 KRAH 050730 RRA
SVSRAH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
330 AM EDT TUE APR 5 2011

NCC001-050740-
/O.CAN.KRAH.SV.W.0021.000000T0000Z-110405T0800Z/
ALAMANCE NC-
330 AM EDT TUE APR 5 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN ALAMANCE COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA AND 
THE WARNING IS NO LONGER IN EFFECT. 

IF YOU OBSERVED SEVERE WEATHER INCLUDING DAMAGING WINDS OR LARGE
HAIL...PLEASE CONTACT THE NATIONAL WEATHER SERVICE BY CALLING TOLL
FREE 1...8 7 7...6 3 3...6 7 7 2...OR NOTIFY YOUR NEAREST LAW
ENFORCEMENT AGENCY AND ASK THEM TO RELAY YOUR REPORT TO THE NATIONAL
WEATHER SERVICE FORECAST OFFICE IN RALEIGH.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 AM EDT TUESDAY MORNING
FOR CENTRAL NORTH CAROLINA.

LAT...LON 3655 7880 3610 7881 3606 7879 3605 7875
      3601 7875 3601 7871 3597 7871 3591 7876
      3592 7881 3586 7883 3585 7908 3587 7925
      3591 7927 3609 7917 3624 7923 3624 7916
      3655 7914
TIME...MOT...LOC 0730Z 262DEG 53KT 3654 7905 3612 7900
          3577 7911

$$

NCC063-135-145-050800-
/O.CON.KRAH.SV.W.0021.000000T0000Z-110405T0800Z/
DURHAM NC-ORANGE NC-PERSON NC-
330 AM EDT TUE APR 5 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 AM EDT
FOR PERSON...ORANGE AND DURHAM COUNTIES...

AT 325 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS.  THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM 6 MILES NORTHWEST OF CONCORD TO
HILLSBOROUGH TO 13 MILES SOUTHWEST OF CARRBORO...OR ALONG A LINE
EXTENDING FROM MILTON TO HILLSBOROUGH TO PITTSBORO...MOVING EAST AT
60 MPH.

HAZARDS IN THE WARNING INCLUDE...
DAMAGING WINDS IN EXCESS OF 65 MPH.

LOCATIONS IN THE PATH OF THE STORM INCLUDE... CHAPEL HILL...
ROXBORO...ROUGEMONT...BAHAMA...DURHAM...SURL...BETHEL HILL...
PARKWOOD...MORIAH...BETHESDA...GORMAN AND RESEARCH TRIANGLE PARK.

STRAIGHT LINE WINDS CAN BLOW DOWN TREES...POWER LINES...AND DAMAGE
MOBILE HOMES AND OTHER BUILDINGS. SEEK SHELTER IN A STURDY STRUCTURE
UNTIL THE STORM HAS PASSED. STAY AWAY FROM WINDOWS AS FLYING DEBRIS
GENERATED BY DAMAGING WINDS CAN BE DEADLY.

WHEN IT IS SAFE TO DO SO...PLEASE CALL IN YOUR REPORTS OF WIND 
DAMAGE...INCLUDING TREES OR LARGE LIMBS DOWNED BY CALLING THE 
NATIONAL WEATHER SERVICE TOLL FREE AT...1...8 7 7...6 3 3...6 7 7 2.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 AM EDT TUESDAY MORNING
FOR CENTRAL NORTH CAROLINA.

LAT...LON 3655 7880 3610 7881 3606 7879 3605 7875
      3601 7875 3601 7871 3597 7871 3591 7876
      3592 7881 3586 7883 3585 7908 3587 7925
      3591 7927 3609 7917 3624 7923 3624 7916
      3655 7914
TIME...MOT...LOC 0730Z 262DEG 53KT 3654 7905 3612 7900
          3577 7911

$$

MWS

695 
WWUS52 KRAH 050743
SVSRAH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
343 AM EDT TUE APR 5 2011

NCC063-135-145-050800-
/O.CON.KRAH.SV.W.0021.000000T0000Z-110405T0800Z/
DURHAM NC-ORANGE NC-PERSON NC-
343 AM EDT TUE APR 5 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 AM EDT
FOR EASTERN PERSON...EASTERN ORANGE AND DURHAM COUNTIES...

AT 339 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS.  THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM BETHEL HILL TO BAHAMA TO 7 MILES SOUTH OF
PARKWOOD...OR ALONG A LINE EXTENDING FROM 6 MILES WEST OF VIRGILINA
TO 8 MILES WEST OF CREEDMOOR TO 8 MILES WEST OF CARY...MOVING EAST AT
60 MPH.

HAZARDS IN THE WARNING INCLUDE...
DAMAGING WINDS IN EXCESS OF 58 MPH.

LOCATIONS IN THE PATH OF THE STORM INCLUDE... RESEARCH TRIANGLE PARK.

STRAIGHT LINE WINDS CAN BLOW DOWN TREES...POWER LINES...AND DAMAGE
MOBILE HOMES AND OTHER BUILDINGS. SEEK SHELTER IN A STURDY STRUCTURE
UNTIL THE STORM HAS PASSED. STAY AWAY FROM WINDOWS AS FLYING DEBRIS
GENERATED BY DAMAGING WINDS CAN BE DEADLY.

THIS STORM HAS A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS 
ALAMANCE COUNTY. THIS IS AN EXTREMELY DANGEROUS SITUATION. SEEK 
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

WHEN IT IS SAFE TO DO SO...PLEASE CALL IN YOUR REPORTS OF PENNY 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 7 7...6 3 3...6 7 7 2.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 AM EDT TUESDAY MORNING
FOR CENTRAL NORTH CAROLINA.

LAT...LON 3610 7881 3606 7879 3605 7875 3601 7875
      3601 7871 3597 7871 3591 7876 3592 7881
      3586 7883 3585 7908 3626 7899 3654 7899
      3655 7880
TIME...MOT...LOC 0742Z 262DEG 53KT 3656 7883 3614 7878
          3579 7889

$$

ELLIS

838 
WWUS52 KRAH 050755
SVSRAH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RALEIGH NC
355 AM EDT TUE APR 5 2011

NCC063-135-145-050805-
/O.EXP.KRAH.SV.W.0021.000000T0000Z-110405T0800Z/
DURHAM NC-ORANGE NC-PERSON NC-
355 AM EDT TUE APR 5 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN PERSON...EASTERN 
ORANGE AND DURHAM COUNTIES EXPIRES AT 400 AM EDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA AND 
THE WARNING WILL BE ALLOWED TO EXPIRE.

IF YOU OBSERVED SEVERE WEATHER INCLUDING DAMAGING WINDS OR LARGE
HAIL...PLEASE CONTACT THE NATIONAL WEATHER SERVICE BY CALLING TOLL
FREE 1...8 7 7...6 3 3...6 7 7 2...OR NOTIFY YOUR NEAREST LAW
ENFORCEMENT AGENCY AND ASK THEM TO RELAY YOUR REPORT TO THE NATIONAL
WEATHER SERVICE FORECAST OFFICE IN RALEIGH.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 AM EDT TUESDAY MORNING
FOR CENTRAL NORTH CAROLINA.

LAT...LON 3610 7881 3606 7879 3605 7875 3601 7875
      3601 7871 3597 7871 3591 7876 3592 7881
      3586 7883 3585 7908 3626 7899 3654 7899
      3655 7880
TIME...MOT...LOC 0755Z 262DEG 53KT 3659 7859 3616 7854
          3582 7866

$$

ELLIS

The office that day

Everything else NWS Raleigh, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 5, 1:32 AM EDT	Severe Thunderstorm Warning	RAH	Davidson, Forsyth	43 min
Apr 5, 2:11 AM EDT	Severe Thunderstorm Warning	RAH	Davidson, Forsyth, Guilford, Randolph	49 min
Apr 5, 2:16 AM EDT	Severe Thunderstorm Warning	RAH	Anson, Montgomery, Randolph, Richmond, Stanly	44 min
Apr 5, 2:40 AM EDT	Tornado Warning	RAH	Davidson, Forsyth, Guilford, Randolph	18 min
Apr 5, 2:50 AM EDT	Severe Thunderstorm Warning	RAH	Alamance, Chatham, Guilford, Randolph	40 min
Apr 5, 2:56 AM EDT	Tornado Warning	RAH	Alamance, Guilford	34 min
Apr 5, 2:58 AM EDT	Severe Thunderstorm Warning	RAH	Anson, Montgomery, Moore, Richmond	47 min
Apr 5, 3:25 AM EDT	Severe Thunderstorm Warning	RAH	Chatham, Wake	50 min
Apr 5, 3:40 AM EDT	Severe Thunderstorm Warning	RAH	Franklin, Granville, Vance, Wake	37 min
Apr 5, 3:42 AM EDT	Special Weather Statement	RAH	Harnett, Hoke, Lee, Scotland	63 min
Apr 5, 4:08 AM EDT	Severe Thunderstorm Warning	RAH	Franklin, Johnston, Nash, Wake	37 min
Apr 5, 4:12 AM EDT	Special Weather Statement	RAH	Warren	63 min
Apr 5, 4:25 AM EDT	Severe Thunderstorm Warning	RAH	Cumberland, Harnett, Johnston, Sampson, Wayne	65 min
Apr 5, 4:36 AM EDT	Severe Thunderstorm Warning	RAH	Edgecombe, Halifax, Johnston, Nash, Wilson	54 min
Apr 5, 5:36 AM EDT	Special Weather Statement	RAH	Sampson, Wayne	54 min
Apr 5, 6:41 AM EDT	Special Weather Statement	RAH	Sampson, Wayne	64 min
Apr 5, 7:06 AM EDT	Frost Advisory	RAH	Alamance, Anson, Chatham, Cumberland, Davidson, Durham and 25 more	26 hr
Apr 5, 8:18 AM EDT	Special Weather Statement	RAH	Alamance, Chatham, Durham, Franklin, Granville, Lee and 6 more	87 min
Apr 5, 8:25 AM EDT	Special Weather Statement	RAH	Cumberland, Harnett, Hoke, Johnston, Lee, Montgomery and 5 more	95 min
Apr 5, 9:33 AM EDT	Severe Thunderstorm Warning	RAH	Cumberland, Harnett, Johnston, Sampson, Wake, Wayne and 1 more	87 min
Apr 5, 9:33 AM EDT	Severe Thunderstorm Warning	RAH	Edgecombe, Franklin, Halifax, Nash, Warren	87 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2011 Every severe thunderstorm warning 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.