Alert archive / North Dakota / Tornado Warnings in 2011

Tornado Warning 91, NWS Bismarck, ND

August 12, 2011LaMoure County, North Dakota

NWS Bismarck, ND issued this tornado warning at Aug 12, 2011, 3:59 PM CDT for LaMoure County, North Dakota. It was in force for 31 min. 1 report 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 12, 2011, 3:59 PM CDT (20:59 UTC)
Expired: Aug 12, 2011, 4:30 PM CDT
In force: 31 min
Issued by: NWS Bismarck, ND
Area: Storm-based polygon

County LaMoure County, ND

The radar

The Aberdeen radar (KABR), 124 km from the middle of the area, began a volume at 21:01 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 12, 4:00 PM CDT	HAIL 1	7 Ese Marion, ND

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
Aug 12, 1:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 9.0 hours before the alert went out and 186 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: 9 J/kg
Mixed-layer CIN: -231 J/kg
Mixed-layer LCL: 847 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 18 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.

897 
WFUS53 KBIS 122059
TORBIS
NDC045-122130-
/O.NEW.KBIS.TO.W.0091.110812T2059Z-110812T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BISMARCK ND
359 PM CDT FRI AUG 12 2011

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN LAMOURE COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 430 PM CDT.

* AT 356 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 7 MILES SOUTH OF LITCHVILLE...OR 27 MILES SOUTH
  OF VALLEY CITY...AND MOVING NORTHEAST AT 5 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHEASTERN LAMOURE COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4649 9831 4664 9826 4664 9803 4662 9802
      4648 9803
TIME...MOT...LOC 2059Z 238DEG 6KT 4655 9817

$$

AYD

2 follow-up statements

241 
WWUS53 KBIS 122110
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
410 PM CDT FRI AUG 12 2011

NDC045-122130-
/O.CON.KBIS.TO.W.0091.000000T0000Z-110812T2130Z/
LAMOURE ND-
410 PM CDT FRI AUG 12 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN LAMOURE
COUNTY UNTIL 430 PM CDT...

AT 405 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED 7 MILES SOUTH OF LITCHVILLE...OR 26 MILES SOUTH OF
VALLEY CITY...MOVING NORTHEAST AT 5 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHEASTERN LAMOURE COUNTY.

LARGE HAIL TO QUARTER SIZE AND STRAIGHTLINE WIND GUSTS TO 60 MPH ARE 
WITH THESE STORMS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 4649 9831 4664 9826 4664 9803 4662 9802
      4648 9803
TIME...MOT...LOC 2109Z 238DEG 6KT 4656 9815

$$

AYD

460 
WWUS53 KBIS 122121
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
421 PM CDT FRI AUG 12 2011

NDC045-122131-
/O.EXP.KBIS.TO.W.0091.000000T0000Z-110812T2130Z/
LAMOURE ND-
421 PM CDT FRI AUG 12 2011

...THE TORNADO WARNING FOR NORTHEASTERN LAMOURE COUNTY WILL EXPIRE AT
430 PM CDT/330 PM MDT/...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER...HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4649 9831 4664 9826 4664 9803 4662 9802
      4648 9803
TIME...MOT...LOC 2121Z 238DEG 6KT 4657 9813

$$

AYD

The office that day

Everything else NWS Bismarck, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 4:19 AM CDT	Areal Flood Advisory	BIS	Divide, Williams	3 hr
Aug 12, 12:41 PM CDT	Areal Flood Advisory	BIS	Bottineau, Pierce, Rolette	6 hr
Aug 12, 12:53 PM CDT	Flash Flood Warning	BIS	Kidder, Sheridan, Wells	6 hr
Aug 12, 1:53 PM CDT	Flash Flood Warning	BIS	Kidder, Stutsman	5 hr
Aug 12, 2:27 PM CDT	Flash Flood Warning	BIS	Foster, Stutsman	5 hr
Aug 12, 2:35 PM CDT	Severe Thunderstorm Warning	BIS	Stutsman	55 min
Aug 12, 3:01 PM CDT	Tornado Warning	BIS	Stutsman	16 min
Aug 12, 3:08 PM CDT	Severe Thunderstorm Warning	BIS	LaMoure	67 min
Aug 12, 3:28 PM CDT	Tornado Warning	BIS	Stutsman	32 min
Aug 12, 3:29 PM CDT	Severe Thunderstorm Warning	BIS	Stutsman	31 min
Aug 12, 3:53 PM CDT	Severe Thunderstorm Warning	BIS	Dickey	45 min
Aug 12, 4:15 PM CDT	Areal Flood Advisory	BIS	Dickey, LaMoure	6 hr
Aug 12, 6:56 PM CDT	Areal Flood Warning	BIS	Foster, Kidder, Stutsman, Wells	65 hr

Nearby

Tornado Warnings in North Dakota, 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.