Alert archive / North Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 80, NWS Bismarck, ND

July 6, 2011Slope County, North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at Jul 6, 2011, 1:29 PM MDT for Slope County, North Dakota. It was in force for 31 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: Jul 6, 2011, 1:29 PM MDT (19:29 UTC)
Expired: Jul 6, 2011, 2:00 PM MDT
In force: 31 min
Issued by: NWS Bismarck, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Slope County, ND

The radar

The Bismarck radar (KBIS), 208 km from the middle of the area, began a volume at 19:30 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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 nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 7.5 hours before the alert went out and 213 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: 1794 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 146 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.

827 
WUUS53 KBIS 061929
SVRBIS
NDC087-062000-
/O.NEW.KBIS.SV.W.0080.110706T1929Z-110706T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BISMARCK ND
129 PM MDT WED JUL 6 2011

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL SLOPE COUNTY IN SOUTHWEST NORTH DAKOTA...

* UNTIL 200 PM MDT

* AT 125 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 10
  MILES NORTHWEST OF AMIDON...OR 26 MILES NORTH OF BOWMAN...AND
  MOVING SOUTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  AMIDON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

VERY HEAVY RAIN IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4664 10355 4663 10339 4661 10332 4646 10313
      4633 10352 4648 10363 4660 10368
TIME...MOT...LOC 1929Z 319DEG 14KT 4654 10350
WIND...HAIL 60MPH 1.00IN

$$

HEINERT

1 follow-up statement

702 
WWUS53 KBIS 061958
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
258 PM CDT WED JUL 6 2011

NDC087-062008-
/O.EXP.KBIS.SV.W.0080.000000T0000Z-110706T2000Z/
SLOPE ND-
158 PM MDT WED JUL 6 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SLOPE COUNTY WILL 
EXPIRE AT 200 PM MDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED.  HOWEVER GUSTY 
WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4664 10355 4663 10339 4661 10332 4646 10313
      4633 10352 4648 10363 4660 10368
TIME...MOT...LOC 1958Z 319DEG 14KT 4645 10339

$$

HEINERT

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 6, 12:13 PM MDT, 1 hour 16 minutes earlier.

Area forecast discussion, Jul 6, 12:13 PM MDT, 1 hour 16 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BISMARCK ND
113 PM CDT WED JUL 6 2011

.UPDATE...
UPDATE MAINLY FOR FIRST PERIOD TEMP/POP CHANGES.

&&

.DISCUSSION...
SCATTERED STORMS HAVE DEVELOPED OVER THE WESTERN FORECAST AREA IN
FRONTAL CONVERGENCE ZONE. SO FAR...ONLY BROAD ROTATION AS
EFFECTIVE SHEAR IS LIMITED TO 30-40 KTS. EXPECTING FURTHER
INTENSIFICATION AS AFTERNOON HEATING INCREASES...AND WE MAY HAVE A
FEW MARGINALLY SEVERE STORMS TO CONTEND WITH.

&&

.AVIATION...
SHOWERS AND THUNDERSTORMS FROM EARLIER THIS MORNING ARE LOCATED
ALONG A LINE FROM KMOT THROUGH KBIS AT 1745 UTC...WITH IFR
CONDITIONS IN THUNDERSTORMS. THESE STORMS ARE FORECAST TO CONTINUE TO
MOVE EAST AND WEAKEN...POTENTIALLY ARRIVING INTO KJMS BY 20 UTC. AS
SKIES HAVE CLEARED BEHIND THIS INITIAL LINE OF STORMS...ADDITIONAL
SCATTERED THUNDERSTORMS HAVE DEVELOPED ACROSS WESTERN NORTH AND
EASTERN MONTANA AND WILL SLOWLY PUSH INTO CENTRAL NORTH DAKOTA
THROUGH THE AFTERNOON. A FEW OF THESE STORMS MAY BE STRONG TO
SEVERE...WITH LARGE HAIL...HEAVY RAIN...DAMAGING WINDS AND IFR
CONDITIONS. THUNDERSTORM COVERAGE IS EXPECTED TO DECREASE WITH
SUNSET...WITH FOG POSSIBLE AT KMOT AND KBIS LATE TONIGHT WITH CLEAR
SKIES...LIGHT WINDS AND MOISTURE FROM PRECIPITATION TODAY.

&&

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

UPDATE...KINNEY
AVIATION...AYD

Hazardous weather outlook, Jul 6, 3:46 AM MDT, 9 hours 43 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BISMARCK ND
446 AM CDT WED JUL 6 2011

NDZ001>005-009>013-017>023-025-031>037-040>048-050-051-071000-
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-
446 AM CDT WED JUL 6 2011 /346 AM MDT WED JUL 6 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...TODAY AND TONIGHT

THERE IS A CHANCE OF THUNDERSTORMS TODAY AND TONIGHT AS ANOTHER
LOW PRESSURE SYSTEM MOVES INTO THE NORTHERN HIGH PLAINS. LARGE
HAIL...DAMAGING WIND AND LOCALLY HEAVY RAINFALL WILL BE THE MAIN
THREATS WITH THESE STORMS. THE BEST CHANCE FOR SEVERE WEATHER IS
SOUTH AND WEST OF MINOT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

AN ORGANIZED SEVERE THUNDERSTORM OUTBREAK ACROSS WESTERN AND
CENTRAL NORTH DAKOTA IS POSSIBLE ON FRIDAY...WITH ALL SEVERE
THUNDERSTORM HAZARDS POSSIBLE. THIS SITUATION WILL HAVE TO BE
CLOSELY MONITORED. THERE IS A SLIGHT CHANCE OF THUNDERSTORMS AGAIN
ON SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT SEVERE WEATHER TO THE BISMARCK
NATIONAL WEATHER SERVICE AT 701-223-4582.

SCHECK

In the hours before

Special weather statement, Jul 6, 8:54 AM MDT, 4 hours 35 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
954 AM CDT WED JUL 6 2011

NDZ020-034-042-061600-
GRANT-MORTON-OLIVER-
954 AM CDT WED JUL 6 2011

...SPECIAL WEATHER STATEMENT...

AT 951 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER WEST CENTRAL MORTON COUNTY...MOVING
NORTHEAST AT 25 MPH.

PENNY SIZE HAIL...WINDS GREATER THAN 40 MPH...FREQUENT CLOUD TO
GROUND LIGHTNING...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
  GLEN ULLIN...         NEW SALEM...

GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW
AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK
SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.

HEINERT

Special weather statement, Jul 6, 12:05 PM MDT, 1 hour 24 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
105 PM CDT WED JUL 6 2011

NDZ031>033-040-061900-
BILLINGS-GOLDEN VALLEY-SLOPE-STARK-
1205 PM MDT WED JUL 6 2011

...SPECIAL WEATHER STATEMENT...

AT 1201 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
DEVELOPING THUNDERSTORM OVER SOUTHEASTERN GOLDEN VALLEY
COUNTY...MOVING SOUTHEAST AT 20 MPH.

PENNY SIZE HAIL...WINDS GREATER THAN 40 MPH...FREQUENT CLOUD TO
GROUND LIGHTNING...AND BRIEF HEAVY DOWNPOURS CAN BE EXPECTED WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  AMIDON...

GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW
AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK
SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.

HEINERT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 12:29 PM MDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley, Slope	61 min
Jul 6, 12:46 PM MDT	Severe Thunderstorm Warning	BIS	Dunn, Stark	59 min
Jul 6, 4:37 PM MDT	Flash Flood Warning	BIS	McKenzie	3 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.