Alert archive / North Dakota / Tornado Warnings in 2011

Tornado Warning 92, NWS Bismarck, ND

August 15, 20114 counties in North Dakota

NWS Bismarck, ND issued this tornado warning at Aug 15, 2011, 4:41 PM MDT for 4 counties in North Dakota. It was in force for 34 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 15, 2011, 4:41 PM MDT (22:41 UTC)
Expired
Aug 15, 2011, 5:15 PM MDT
In force
34 min
Issued by
NWS Bismarck, ND
Area
Storm-based polygon

Counties Dunn County, ND, Mercer County, ND, Morton County, ND, Stark County, ND

The radar

The Bismarck radar (KBIS), 112 km from the middle of the area, began a volume at 22:43 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

TimeReportWhereRemark
Aug 15, 4:57 PM MDTHAIL 1.755 N Richardton, NDHAIL STARTED APPROX AT 557 PM CDT AND WAS STILL OCCURRING WHEN REPORTED AT 610 PM CDT.

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.

IssuedProductOfficeLasted
Aug 15, 4:23 PM MDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 10.7 hours before the alert went out and 116 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-pSkew-T log-p diagram, Bismarck Municip, ND at 12:00Z on 2011-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.1000850700500300200100-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 12:00Z on 2011-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -27 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
7951 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-27 m²/s²
0-3 km storm-relative helicity
119 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.

355 
WFUS53 KBIS 152241
TORBIS
NDC025-057-059-089-152315-
/O.NEW.KBIS.TO.W.0092.110815T2241Z-110815T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BISMARCK ND
441 PM MDT MON AUG 15 2011

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN DUNN COUNTY IN SOUTHWEST NORTH DAKOTA...
  SOUTHWESTERN MERCER COUNTY IN SOUTH CENTRAL NORTH DAKOTA...
  NORTHWESTERN MORTON COUNTY IN SOUTH CENTRAL NORTH DAKOTA...
  NORTHEASTERN STARK COUNTY IN SOUTHWEST NORTH DAKOTA...

* UNTIL 515 PM MDT/615 PM CDT/

* AT 438 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR HIRSCHVILLE...OR 19 MILES NORTHEAST OF
  DICKINSON...AND MOVING SOUTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MARSHALL...RICHARDTON AND HEBRON.

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.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE IN BISMARCK AT
701-223-4582.

&&

LAT...LON 4720 10185 4677 10199 4697 10263 4719 10250
TIME...MOT...LOC 2242Z 295DEG 32KT 4703 10242

$$

MERRIMAN
1 follow-up statement
097 
WWUS53 KBIS 152306
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
606 PM CDT MON AUG 15 2011

NDC025-057-059-089-152315-
/O.CON.KBIS.TO.W.0092.000000T0000Z-110815T2315Z/
MERCER ND-STARK ND-MORTON ND-DUNN ND-
506 PM MDT MON AUG 15 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN DUNN...
NORTHWESTERN MORTON...NORTHEASTERN STARK AND SOUTHWESTERN MERCER
COUNTIES UNTIL 515 PM MDT/615 PM CDT/...

AT 506 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR RICHARDTON...OR 24 MILES EAST OF DICKINSON...
MOVING SOUTHEAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  HEBRON.

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.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE IN BISMARCK AT
701-223-4582.

&&

LAT...LON 4719 10241 4720 10185 4677 10199 4693 10251
TIME...MOT...LOC 2307Z 311DEG 20KT 4692 10227

$$

MERRIMAN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 7:22 PM MDTSevere Thunderstorm WarningBISEmmons, Logan, McIntosh53 min
Aug 14, 8:18 PM MDTAreal Flood AdvisoryBISEmmons, Logan, McIntosh, Morton6 hr
Aug 14, 8:30 PM MDTSevere Thunderstorm WarningBISDivide, Williams51 min
Aug 14, 9:14 PM MDTFlash Flood WarningBISEmmons, Morton6 hr
Aug 14, 10:27 PM MDTSevere Thunderstorm WarningBISDivide, Williams63 min
Aug 14, 11:23 PM MDTSevere Thunderstorm WarningBISMorton, Oliver67 min
Aug 15, 12:48 AM MDTSevere Thunderstorm WarningBISMcKenzie57 min
Aug 15, 1:44 AM MDTSevere Thunderstorm WarningBISDunn, McKenzie, McLean, Mountrail61 min
Aug 15, 2:46 AM MDTSevere Thunderstorm WarningBISDunn, Mercer59 min
Aug 15, 3:04 AM MDTAreal Flood WarningBISEmmons, Morton7 hr
Aug 15, 3:23 AM MDTSevere Thunderstorm WarningBISMcLean, Mercer50 min
Aug 15, 3:46 AM MDTSevere Thunderstorm WarningBISMercer, Oliver29 min
Aug 15, 4:10 AM MDTSevere Thunderstorm WarningBISBurleigh, McLean, Mercer, Morton, Oliver65 min
Aug 15, 7:19 AM MDTSevere Thunderstorm WarningBISDickey, LaMoure56 min
Aug 15, 4:12 PM MDTSevere Thunderstorm WarningBISDunn, Stark63 min
Aug 15, 4:23 PM MDTSevere Thunderstorm WarningBISBowman, Slope67 min
Aug 15, 5:14 PM MDTSevere Thunderstorm WarningBISDunn, Mercer, Morton, Stark20 min
Aug 15, 5:18 PM MDTSevere Thunderstorm WarningBISBottineau, Renville38 min
Aug 15, 5:20 PM MDTSevere Thunderstorm WarningBISAdams, Bowman, Hettinger, Slope55 min

Nearby

Tornado Warnings in North Dakota, 2011Every tornado warning in 2011Tornadoes 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.