Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 208, NWS Bismarck, ND

August 31, 2002Sioux County, North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at Aug 31, 2002, 9:22 PM CDT for Sioux County, North Dakota. It was in force for 53 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 31, 2002, 9:22 PM CDT (02:22 UTC)
Expired: Aug 31, 2002, 10:15 PM CDT
In force: 53 min
Issued by: NWS Bismarck, ND
Area: Counties, with a storm outline in the text

County Sioux County, ND

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 watch it was issued in

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

Issued	Product	Office	Lasted
Aug 31, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 2.4 hours before the alert went out and 81 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: 1564 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 2744 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

412 
WUUS53 KBIS 010222
SVRBIS
NDC085-010315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BISMARCK ND
821 PM MDT SAT AUG 31 2002

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SIOUX COUNTY IN SOUTH CENTRAL NORTH DAKOTA

* UNTIL 915 PM MDT(1015 PM CDT)

* AT 821 PM MDT(921 PM CDT)...NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED A SEVERE THUNDERSTORM 12 MILES NORTH OF SELFRIDGE...OR
  ABOUT 42 MILES SOUTH OF BISMARCK...MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CANNONBALL AT 840 PM MDT
  
LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN 
THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A 
SUBSTANTIAL SHELTER.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT
SATURDAY EVENING(MIDNIGHT CDT SUNDAY MORNING) FOR SOUTHERN NORTH
DAKOTA.

LAT...LON 4622 10102 4604 10138 4602 10199 4596 10200
          4596 10057 4610 10066 4640 10064

TWH

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 Aug 31, 2:15 PM CDT, 7 hours 7 minutes earlier.

Area forecast discussion, Aug 31, 2:15 PM CDT, 7 hours 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BISMARCK ND
215 PM CDT SAT AUG 31 2002

THE LEADING EDGE OF THE MID LEVEL ASCENT REGION WILL OVERTAKE THE
SURFACE TROUGH ROUGHLY FROM SIOUX COUNTY NORTHEAST TO DEVILS LAKE
AROUND 22Z...AT MAX HEATING. THIS SHOULD BE WHERE THE THUNDERSTORMS
WILL FIRE UP. SOME OF THIS ACTIVITY WILL LIKELY BE SEVERE AS IT
MARCHES EAST. ALREADY...THE APPROACHING DISTURBANCE HAS SET OFF
MODERATE THUNDERSTORM ACTIVITY IN THE NORTHWEST QUARTER OF THE
STATE.

THE PASSAGE OF THIS SURFACE TROUGH WILL NOT HOWEVER BE THE END OF
THE CONVECTION THREAT THIS HOLIDAY WEEKEND...AS A WEAK AND THEN A
MODERATELY STRONG SHORT WAVE FOLLOW IN SUCCESSION SUNDAY AFTERNOON
AND SUNDAY NIGHT. THESE FEATURES WILL BRING A CHANCE OF SHOWERS AND
THUNDERSHOWERS.

LABOR DAY MONDAY WILL FINALLY PRESENT A PLEASANTLY DRY NORTHWEST
SURFACE WIND...WITH SUNNY SKIES AS A MID LEVEL RIDGE BUILDS UP OVER
THE ROCKIES.

.BIS...NONE.
RS LEBLANG

In the hours before

Local storm report, Aug 31, 6:33 PM CDT, 2 hours 49 minutes before

PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE BISMARCK ND

633 PM CDT SAT AUG 31 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...

           ....COUNTY LOCATION....

0545 PM    3 SW ST JOHN              ND   1.75 INCH HAIL

08/31/02   ROLETTE                        REPORTED BY STORM

                                          SPOTTER.

0627 PM    1 W MANDAN                ND   1 INCH HAIL

08/31/02   MORTON                         REPORTED BY LAW

                                          ENFORCEMENT OFFICIAL.

Local storm report, Aug 31, 7:12 PM CDT, 2 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE BISMARCK ND

712 PM CDT SAT AUG 31 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...

           ....COUNTY LOCATION....

0642 PM    BISMARCK                  ND   2 INCH HAIL

08/31/02   BURLEIGH                       REPORTED BY PUBLIC.

0649 PM    3 N BISMARCK              ND   1.5 INCH HAIL

08/31/02   BURLEIGH                       REPORTED BY OFF-DUTY

                                          NWS EMPLOYEE.

Local storm report, Aug 31, 8:22 PM CDT, 1 hour before

PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE BISMARCK ND

822 PM CDT SAT AUG 31 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...

           ....COUNTY LOCATION....

0655 PM    ALMONT                    ND   .75 INCH HAIL

08/31/02   MORTON                         EVENT DURATION 10

                                          MINUTES. REPORTED BY

                                          COOPERATIVE OBSERVER.

0748 PM    7 W MANDAN                ND   .88 INCH HAIL

08/31/02   MORTON                         REPORTED BY LAW

                                          ENFORCEMENT OFFICIAL.

0752 PM    BISMARCK                  ND   1 INCH HAIL

08/31/02   BURLEIGH                       REPORTED BY STORM

                                          SPOTTER.

0753 PM    BISMARCK                  ND   2.5 INCH HAIL

08/31/02   BURLEIGH                       REPORTED BY STORM

                                          SPOTTER.

0805 PM    BISMARCK                  ND   URBAN FLOODING

08/31/02   BURLEIGH                       EVENT DURATION 20

                                          MINUTES. REPORTED BY

                                          HAM RADIO OPERATOR.

                                          STREETS AND OVERPASSES

                                          FILLING WITH WATER.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 7:30 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh	60 min
Aug 31, 7:41 PM CDT	Severe Thunderstorm Warning	BIS	Morton	49 min
Aug 31, 7:56 PM CDT	Severe Thunderstorm Warning	BIS	Kidder	64 min
Aug 31, 8:27 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh	48 min
Aug 31, 9:06 PM CDT	Severe Thunderstorm Warning	BIS	Slope	54 min
Aug 31, 9:13 PM CDT	Severe Thunderstorm Warning	BIS	Morton	32 min
Aug 31, 9:15 PM CDT	Severe Thunderstorm Warning	BIS	Emmons, Logan	60 min
Aug 31, 9:41 PM CDT	Severe Thunderstorm Warning	BIS	Kidder, Stutsman	64 min
Aug 31, 10:50 PM CDT	Severe Thunderstorm Warning	BIS	Dickey, LaMoure, Logan, McIntosh	55 min
Aug 31, 11:58 PM CDT	Severe Thunderstorm Warning	BIS	Dickey	62 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2002 Every severe thunderstorm warning in 2002

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.