Alert archive / North Dakota / Tornado Warnings in 2008

Tornado Warning 35, NWS Bismarck, ND

July 23, 2008Sioux County, North Dakota

NWS Bismarck, ND issued this tornado warning at Jul 23, 2008, 6:24 PM CDT for Sioux County, North Dakota. It was in force for 36 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 23, 2008, 6:24 PM CDT (23:24 UTC)
Expired: Jul 23, 2008, 7:00 PM CDT
In force: 36 min
Issued by: NWS Bismarck, ND
Area: Storm-based polygon

County Sioux County, ND

The radar

The Bismarck radar (KBIS), 70 km from the middle of the area, began a volume at 23:24 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 nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 11.4 hours before the alert went out and 71 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: 173 J/kg
Mixed-layer CIN: -313 J/kg
Mixed-layer LCL: 857 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 303 m²/s²
0-3 km storm-relative helicity: 370 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 9.6

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KBIS 232324
TORBIS
NDC085-240000-
/O.NEW.KBIS.TO.W.0035.080723T2324Z-080724T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BISMARCK ND
624 PM CDT WED JUL 23 2008

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL SIOUX COUNTY IN SOUTH CENTRAL NORTH DAKOTA...

* UNTIL 700 PM CDT

* AT 618 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES NORTH OF
  SELFRIDGE...OR 47 MILES SOUTH OF BISMARCK...MOVING EAST AT 15 MPH.

* THE TORNADO WILL BE NEAR...
  6 MILES NORTH OF SELFRIDGE BY 630 PM CDT...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 4622 10081 4604 10085 4605 10109 4624 10103
TIME...MOT...LOC 2324Z 282DEG 13KT 4613 10093

$$

SIMOSKO

3 follow-up statements

000 
WWUS53 KBIS 232334
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
634 PM CDT WED JUL 23 2008

NDC085-240000-
/O.CON.KBIS.TO.W.0035.000000T0000Z-080724T0000Z/
SIOUX ND-
634 PM CDT WED JUL 23 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR CENTRAL
SIOUX COUNTY...

AT 630 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED 6 MILES NORTH OF
SELFRIDGE...OR 47 MILES SOUTH OF BISMARCK...MOVING EAST AT 15 MPH.

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

LAT...LON 4622 10081 4604 10085 4605 10109 4624 10103
TIME...MOT...LOC 2334Z 282DEG 13KT 4612 10088

$$

SIMOSKO

000 
WWUS53 KBIS 232346
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
646 PM CDT WED JUL 23 2008

NDC085-240000-
/O.CON.KBIS.TO.W.0035.000000T0000Z-080724T0000Z/
SIOUX ND-
646 PM CDT WED JUL 23 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR CENTRAL
SIOUX COUNTY...

AT 642 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED 6 MILES NORTHEAST OF
SELFRIDGE...OR 48 MILES SOUTH OF BISMARCK...MOVING EAST AT 15 MPH.

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM CDT
THURSDAY MORNING FOR SOUTHEASTERN NORTH DAKOTA.

LAT...LON 4605 10099 4622 10096 4622 10081 4615 10083
      4614 10083 4604 10085
TIME...MOT...LOC 2346Z 282DEG 13KT 4611 10082

$$

SIMOSKO

000 
WWUS53 KBIS 232355
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
655 PM CDT WED JUL 23 2008

NDC085-240005-
/O.EXP.KBIS.TO.W.0035.000000T0000Z-080724T0000Z/
SIOUX ND-
655 PM CDT WED JUL 23 2008

...THE TORNADO WARNING FOR CENTRAL SIOUX COUNTY WILL EXPIRE AT 700 PM
CDT/600 PM MDT/...

THE SEVERE THUNDERSTORM HAS WEAKENED AND NO LONGER POSES A
SIGNIFICANT THREAT.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM CDT
THURSDAY MORNING FOR SOUTHEASTERN NORTH DAKOTA.

LAT...LON 4605 10099 4622 10096 4622 10081 4615 10083
      4614 10083 4604 10085
TIME...MOT...LOC 2355Z 282DEG 13KT 4610 10077

$$

SIMOSKO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 3:56 AM CDT	Severe Thunderstorm Warning	BIS	Mountrail, Williams	64 min
Jul 23, 4:50 AM CDT	Severe Thunderstorm Warning	BIS	Ward	55 min
Jul 23, 6:53 AM CDT	Areal Flood Advisory	BIS	Ward	3 hr
Jul 23, 1:00 PM CDT	Areal Flood Advisory	BIS	Stutsman	3 hr
Jul 23, 5:23 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Sioux	67 min
Jul 23, 6:07 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Sheridan	53 min
Jul 23, 6:57 PM CDT	Severe Thunderstorm Warning	BIS	Sioux	29 min

Nearby

Tornado Warnings in North Dakota, 2008 Every tornado warning in 2008 Tornadoes in 2008

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.