Alert archive / North Dakota / Tornado Warnings in 2011

Tornado Warning 90, NWS Bismarck, ND

August 12, 2011Stutsman County, North Dakota

NWS Bismarck, ND issued this tornado warning at Aug 12, 2011, 3:28 PM CDT for Stutsman County, North Dakota. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 12, 2011, 3:28 PM CDT (20:28 UTC)
Expired: Aug 12, 2011, 4:00 PM CDT
In force: 32 min
Issued by: NWS Bismarck, ND
Area: Storm-based polygon

County Stutsman County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 102 km from the middle of the area, began a volume at 20:32 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.

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

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.5 hours before the alert went out and 167 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: 1057 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 845 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: -21 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.

655 
WFUS53 KBIS 122028
TORBIS
NDC093-122100-
/O.NEW.KBIS.TO.W.0090.110812T2028Z-110812T2100Z/

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

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

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

* UNTIL 400 PM CDT

* AT 324 PM CDT...THE PUBLIC REPORTED A APPROXIMATELY 10 MILES SOUTH 
  OF COURTENAY TORNADO...OR 19 MILES NORTH OF JAMESTOWN. DOPPLER     
  RADAR SHOWED THIS TORNADO MOVING EAST AT 5 MPH.

* LOCATIONS IMPACTED INCLUDE...
  COURTENAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. 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 4710 9846 4710 9873 4719 9874 4731 9846
TIME...MOT...LOC 2027Z 259DEG 6KT 4718 9862

$$

AYD

2 follow-up statements

192 
WWUS53 KBIS 122036
SVSBIS

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

NDC093-122100-
/O.CON.KBIS.TO.W.0090.000000T0000Z-110812T2100Z/
STUTSMAN ND-
336 PM CDT FRI AUG 12 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN STUTSMAN
COUNTY UNTIL 400 PM CDT...

AT 332 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR COURTENAY...OR 19 MILES NORTH OF JAMESTOWN...
MOVING EAST AT 5 MPH.

AT 323 PM CDT...THE PUBLIC REPORTED A TORNADO ON THE GROUND 
APPROXIMATELY 10 MILES SOUTH OF COURTENAY.

LOCATIONS IMPACTED INCLUDE...
  COURTENAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4710 9846 4710 9873 4719 9874 4731 9846
TIME...MOT...LOC 2035Z 259DEG 6KT 4718 9860

$$

AYD

287 
WWUS53 KBIS 122053
SVSBIS

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

NDC093-122103-
/O.EXP.KBIS.TO.W.0090.000000T0000Z-110812T2100Z/
STUTSMAN ND-
353 PM CDT FRI AUG 12 2011

...THE TORNADO WARNING FOR NORTHEASTERN STUTSMAN COUNTY WILL EXPIRE
AT 400 PM CDT/300 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 4710 9846 4710 9873 4719 9874 4731 9846
TIME...MOT...LOC 2053Z 259DEG 6KT 4719 9856

$$

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, 3:29 PM CDT	Severe Thunderstorm Warning	BIS	Stutsman	31 min
Aug 12, 3:53 PM CDT	Severe Thunderstorm Warning	BIS	Dickey	45 min
Aug 12, 3:59 PM CDT	Tornado Warning	BIS	LaMoure	31 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.