Alert archive / North Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 235, NWS Bismarck, ND

July 31, 20117 counties in North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at Jul 31, 2011, 11:36 PM CDT for 7 counties in North Dakota. It was in force for 54 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: Jul 31, 2011, 11:36 PM CDT (04:36 UTC)
Expired: Aug 1, 2011, 12:30 AM CDT
In force: 54 min
Issued by: NWS Bismarck, ND
Area: Storm-based polygon
Hail: 0.75 in
Wind: 80.0 mph

Counties Burleigh County, ND, Emmons County, ND, Kidder County, ND, Logan County, ND, McLean County, ND, Sheridan County, ND, Wells County, ND

The radar

The Bismarck radar (KBIS), 71 km from the middle of the area, began a volume at 04:39 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
Jul 31, 11:48 PM CDT	TSTM WND GST 80	11 Sw Tuttle, ND	ARB OBSERVER 11 MILES SOUTHWEST OF TUTTLE ESTIMATED 80 MPH WINDS.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 12 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 31, 5:44 PM CDT	Tornado Watch	SPC	7 hr
Jul 31, 10:26 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 4.6 hours before the alert went out and 67 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: 5391 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1026 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 243 m²/s²
Significant tornado parameter: 5.9
Supercell composite: 30.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

251 
WUUS53 KBIS 010436
SVRBIS
NDC015-029-043-047-055-083-103-010530-
/O.NEW.KBIS.SV.W.0235.110801T0436Z-110801T0530Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BISMARCK ND
1136 PM CDT SUN JUL 31 2011

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BURLEIGH COUNTY IN SOUTH CENTRAL NORTH DAKOTA...
  NORTHERN EMMONS COUNTY IN SOUTH CENTRAL NORTH DAKOTA...
  KIDDER COUNTY IN SOUTH CENTRAL NORTH DAKOTA...
  NORTHWESTERN LOGAN COUNTY IN SOUTHEAST NORTH DAKOTA...
  SOUTHEASTERN MCLEAN COUNTY IN SOUTH CENTRAL NORTH DAKOTA...
  SOUTHERN SHERIDAN COUNTY IN SOUTH CENTRAL NORTH DAKOTA...
  SOUTHERN WELLS COUNTY IN SOUTH CENTRAL NORTH DAKOTA...

* UNTIL 1230 AM CDT

* AT 1130 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 80 MPH.  THE LEADING EDGE OF THESE STORMS WAS         
  LOCATED ALONG A LINE EXTENDING FROM 6 MILES NORTH OF WILTON TO     
  WING TO MOFFIT...AND MOVING NORTHEAST AT 50 MPH. PENNY SIZE HAIL   
  MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...
  ARENA...DRISCOLL...NEW JOHNS LAKE...TUTTLE...STEELE...MCCLUSKY...
  LAKE ISABEL...DAWSON...HORSEHEAD LAKE...ROBINSON...DENHOFF...
  GOODRICH...TAPPEN...HURDSFIELD...CHASELEY...LAKE WILLIAMS...CRYSTAL
  SPRINGS...BOWDON...HEATON AND PETTIBONE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...TAKE SHELTER IN A STURDY
BUILDING...AND STAY AWAY FROM WINDOWS.

THESE STORMS HAVE A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE 
ACROSS BISMARCK AND MANDAN. THIS IS AN EXTREMELY DANGEROUS 
SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY 
FROM WINDOWS.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT MONDAY MORNING FOR
SOUTHERN NORTH DAKOTA.

LAT...LON 4719 10100 4725 10097 4773 10006 4756 9939
      4733 9941 4732 9948 4698 9948 4697 9944
      4664 9946 4648 10046
TIME...MOT...LOC 0435Z 231DEG 43KT 4728 10073 4714 10017
          4671 10016
WIND...HAIL 80MPH 0.75IN

$$

VINING

2 follow-up statements

489 
WWUS53 KBIS 010503
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
1203 AM CDT MON AUG 1 2011

NDC029-047-055-010512-
/O.CAN.KBIS.SV.W.0235.000000T0000Z-110801T0530Z/
EMMONS ND-LOGAN ND-MCLEAN ND-
1203 AM CDT MON AUG 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MCLEAN...
NORTHWESTERN LOGAN AND NORTHERN EMMONS COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA.

LAT...LON 4728 10066 4773 10006 4756 9939 4733 9941
      4733 9947 4699 9949 4695 9944 4664 9946
      4663 10012
TIME...MOT...LOC 0502Z 236DEG 42KT 4755 10028 4725 9976
          4677 9970

$$

NDC015-043-083-103-010530-
/O.CON.KBIS.SV.W.0235.000000T0000Z-110801T0530Z/
BURLEIGH ND-KIDDER ND-SHERIDAN ND-WELLS ND-
1203 AM CDT MON AUG 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
WELLS...SOUTHEASTERN SHERIDAN...KIDDER AND EASTERN BURLEIGH COUNTIES
UNTIL 1230 AM CDT...

AT 1158 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
IN EXCESS OF 80 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM DENHOFF TO 6 MILES NORTH OF ROBINSON TO 5 MILES SOUTH
OF LAKE ISABEL...MOVING NORTHEAST AT 50 MPH. PENNY SIZE HAIL MAY ALSO
ACCOMPANY THESE DAMAGING WINDS.

SEVERE THUNDERSTORMS WILL BE NEAR...
  TAPPEN...LAKE WILLIAMS AND HURDSFIELD AROUND 1210 AM CDT.
  PETTIBONE AND CHASELEY AROUND 1215 AM CDT.
  CRYSTAL SPRINGS AND BOWDON AROUND 1220 AM CDT.
  HEATON AROUND 1225 AM CDT.
  SYKESTON AND CATHAY AROUND 1230 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

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

&&

LAT...LON 4728 10066 4773 10006 4756 9939 4733 9941
      4733 9947 4699 9949 4695 9944 4664 9946
      4663 10012
TIME...MOT...LOC 0502Z 236DEG 42KT 4755 10028 4725 9976
          4677 9970
WIND...HAIL 80MPH 0.75IN

$$

KINNEY

479 
WWUS53 KBIS 010530
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
1230 AM CDT MON AUG 1 2011

NDC015-043-083-103-010540-
/O.EXP.KBIS.SV.W.0235.000000T0000Z-110801T0530Z/
BURLEIGH ND-KIDDER ND-SHERIDAN ND-WELLS ND-
1230 AM CDT MON AUG 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WELLS...SOUTHEASTERN 
SHERIDAN...KIDDER AND EASTERN BURLEIGH COUNTIES HAS BEEN REISSUED TO 
THE EAST...

PLEASE REFER TO THAT BULLETIN FOR THE LATEST SEVERE WEATHER
INFORMATION.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 1 AM CDT.

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 115 
AM CDT FOR PARTS OF KIDDER...WELLS...STUTSMAN...AND FOSTER COUNTIES..

LAT...LON 4728 10066 4773 10006 4756 9939 4733 9941
      4733 9947 4699 9949 4695 9944 4664 9946
      4663 10012
TIME...MOT...LOC 0530Z 236DEG 42KT 4773 9987 4743 9936
          4695 9930

$$

KINNEY

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Bismarck, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 31, 11:35 PM CDT, 1 minute earlier.

Area forecast discussion, Jul 31, 11:35 PM CDT, 1 minute before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BISMARCK ND
1135 PM CDT SUN JUL 31 2011

.UPDATE...

HAZARDS.

&&

.DISCUSSION...

WILL TRIM OFF THE SOUTHWEST FROM THE TORNADO WATCH. ALL OTHER
HEADLINES UNCHANGED.

&&

.AVIATION...

STRONG THUNDERSTORM COMPLEX CONTINUES TO PUSH NORTH AND EAST OVER
SOUTH CENTRAL ND. KBIS WAS IMPACTED WITH VERY STRONG WIND GUSTS.
KJMS MAY BE IMPACTED WITH STRONG WINDS BETWEEN 0530Z-07Z.

&&

.BIS WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

UPDATE...NH

Hazardous weather outlook, Jul 31, 8:14 PM CDT, 3 hours 22 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BISMARCK ND
814 PM CDT SUN JUL 31 2011

NDZ001>005-009>013-017>023-025-031>037-040>048-050-051-020115-
DIVIDE-BURKE-RENVILLE-BOTTINEAU-ROLETTE-WILLIAMS-MOUNTRAIL-WARD-
MCHENRY-PIERCE-MCKENZIE-DUNN-MERCER-OLIVER-MCLEAN-SHERIDAN-WELLS-
FOSTER-GOLDEN VALLEY-BILLINGS-STARK-MORTON-BURLEIGH-KIDDER-
STUTSMAN-SLOPE-HETTINGER-GRANT-BOWMAN-ADAMS-SIOUX-EMMONS-LOGAN-
LA MOURE-MCINTOSH-DICKEY-
814 PM CDT SUN JUL 31 2011 /714 PM MDT SUN JUL 31 2011/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
NORTH DAKOTA...NORTHWEST NORTH DAKOTA...SOUTH CENTRAL NORTH
DAKOTA...SOUTHEAST NORTH DAKOTA AND SOUTHWEST NORTH DAKOTA.

.DAY ONE...TONIGHT

THERE REMAINS A CHANCE OF THUNDERSTORMS WEST AND CENTRAL. SOME
THUNDERSTORMS COULD BECOME SEVERE WITH A THREAT OF LARGE HAIL AND
DAMAGING WIND. ACROSS THE SOUTHWEST...SOUTH CENTRAL AND
SOUTHEAST...THERE IS AN INCREASED CHANCE FOR AN ISOLATED TORNADO
OR TWO NEAR A NORTHWARD ADVANCING WARM FRONT THROUGH THIS
EVENING.

FOR LATER TONIGHT...THE WARM FRONT WILL MOVE THROUGH AND A LOW
LEVEL JET WILL DEVELOP WHICH WILL PROMOTE A BETTER CHANCE FOR
WIDESPREAD THUNDERSTORMS OVER A LARGER AREA...SOME OF WHICH COULD
BE SEVERE WITH LARGE HAIL AND DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

FOR MONDAY...A COLD FRONT WILL MOVE FROM WEST TO EAST.
THUNDERSTORMS ARE FORECAST TO DEVELOP ALONG AND AHEAD OF THE COLD
FRONT. SOME THUNDERSTORMS AGAIN COULD BECOME SEVERE MONDAY
AFTERNOON AND EVENING. PRIOR TO THE COLD FRONT MOVING
THROUGH...HEAT INDICES MAY REACH 100 TO 105 DEGREES OVER PORTIONS
OF CENTRAL AND SOUTH EASTERN NORTH DAKOTA. STAY TUNED FOR UPDATES.

THERE IS A CHANCE FOR THUNDERSTORMS WEDNESDAY THROUGH SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS AND COOPERATIVE OBSERVERS ARE ENCOURAGED TO REPORT SEVERE
WEATHER TO THE BISMARCK NATIONAL WEATHER SERVICE AT 1-800-247-0212.

NH

In the hours before

Local storm report, Jul 31, 11:19 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
1119 PM CDT SUN JUL 31 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1118 PM     TSTM WND GST     10 N BISMARCK           46.95N 100.78W
07/31/2011  M78 MPH          BURLEIGH           ND   MESONET

&&

JMETZ

Local storm report, Jul 31, 11:23 PM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
1123 PM CDT SUN JUL 31 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1117 PM     TSTM WND DMG     MANDAN                  46.83N 100.89W
07/31/2011                   MORTON             ND   NWS EMPLOYEE

            SEVERAL TREE LIMBS SNAPPED WITH A DIAMETER OF 6 INCHES
            FROM 70 MPH WIND GUSTS.

&&

JTAEGER

Local storm report, Jul 31, 11:26 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
1126 PM CDT SUN JUL 31 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1110 PM     TSTM WND DMG     6 N BISMARCK            46.90N 100.78W
07/31/2011                   BURLEIGH           ND   LAW ENFORCEMENT

            TRAMPOLINE FLEW INTO THE SIDE OF HOME CAUSING DAMAGE.
            WINDS ESTIMATED AT 80 TO 85 MPH.

&&

NHEINERT

Local storm report, Jul 31, 11:30 PM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
1130 PM CDT SUN JUL 31 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1109 PM     TSTM WND GST     BISMARCK                46.81N 100.78W
07/31/2011  M68 MPH          BURLEIGH           ND   ASOS

&&

JTAEGER

Local storm report, Jul 31, 11:31 PM CDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
1131 PM CDT SUN JUL 31 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1118 PM     TSTM WND DMG     MANDAN                  46.83N 100.89W
07/31/2011                   MORTON             ND   PUBLIC

            AVERAGE 2 TO 4 INCH DIAMETER TREE LIMBS DOWN...LARGEST 10
            INCHES IN SIZE. GAZEBO CANOPY TORN OFF.

&&

JMETZ

Local storm report, Jul 31, 11:35 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
1135 PM CDT SUN JUL 31 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1133 PM     FLASH FLOOD      BISMARCK                46.81N 100.78W
07/31/2011                   BURLEIGH           ND   AMATEUR RADIO

            1 FOOT TO 1.5 FEET OF WATER ON AIRPORT ROAD.

&&

JMETZ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:33 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Sioux	57 min
Jul 31, 8:50 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman, Hettinger	55 min
Jul 31, 9:25 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Hettinger, Morton	65 min
Jul 31, 9:27 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Hettinger	63 min
Jul 31, 10:00 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Grant, Morton, Oliver	60 min
Jul 31, 10:13 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Hettinger, Morton	47 min
Jul 31, 10:26 PM CDT	Severe Thunderstorm Warning	BIS	Mercer, Morton, Stark	46 min
Jul 31, 10:35 PM CDT	Flash Flood Warning	BIS	Burleigh, Grant, Morton, Sioux	5 hr
Jul 31, 10:49 PM CDT	Severe Thunderstorm Warning	BIS	Mercer, Morton, Oliver	56 min
Jul 31, 11:00 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Emmons, Kidder, Morton, Oliver, Sheridan	60 min
Jul 31, 11:26 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, McHenry, McLean, Mercer, Oliver, Sheridan and 1 more	64 min
Aug 1, 12:11 AM CDT	Severe Thunderstorm Warning	BIS	Foster, Kidder, Stutsman, Wells	64 min
Aug 1, 12:53 AM CDT	Severe Thunderstorm Warning	BIS	Foster, Wells	52 min
Aug 1, 1:02 AM CDT	Severe Thunderstorm Warning	BIS	Pierce	28 min
Aug 1, 1:07 AM CDT	Severe Thunderstorm Warning	BIS	Foster, Stutsman, Wells	53 min
Aug 1, 1:28 AM CDT	Severe Thunderstorm Warning	BIS	Emmons, Logan, McIntosh	47 min
Aug 1, 2:11 AM CDT	Severe Thunderstorm Warning	BIS	Dickey, LaMoure, Logan, McIntosh	64 min
Aug 1, 3:00 AM CDT	Heat Advisory	BIS	Burleigh, Dickey, Emmons, Foster, Grant, Kidder and 5 more	16 hr
Aug 1, 4:14 AM CDT	Areal Flood Advisory	BIS	Foster, Kidder, Sheridan, Stutsman, Wells	13 hr
Aug 1, 1:54 PM CDT	Severe Thunderstorm Warning	BIS	Adams, Bowman	49 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 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.