Alert archive / North Dakota / Tornado Warnings in 2007

Tornado Warning 10, NWS Bismarck, ND

May 25, 2007Sioux County, North Dakota

NWS Bismarck, ND issued this tornado warning at May 25, 2007, 4:30 PM CDT for Sioux County, North Dakota. It was in force for 30 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: May 25, 2007, 4:30 PM CDT (21:30 UTC)
Expired: May 25, 2007, 5:00 PM CDT
In force: 30 min
Issued by: NWS Bismarck, ND
Area: Counties, with a storm outline in the text

County Sioux County, ND

The radar

The Bismarck radar (KBIS), 71 km from the middle of the area, began a volume at 21:32 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 25, 2:05 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 9.5 hours before the alert went out and 72 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: 1317 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 248 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.

000 
WFUS53 KBIS 252130
TORBIS
NDC085-252200-
/O.NEW.KBIS.TO.W.0010.070525T2130Z-070525T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BISMARCK ND
430 PM CDT FRI MAY 25 2007

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

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

* UNTIL 500 PM CDT

* AT 430 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
  PORCUPINE...OR ABOUT 49 MILES SOUTH OF BISMARCK...MOVING NORTHEAST
  AT 20 MPH.

* THE TORNADO WILL BE NEAR...
  PORCUPINE AROUND 440 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 4610 10129 4602 10109 4631 10073 4633 10097

$$

CS/HW

2 follow-up statements

000 
WWUS53 KBIS 252147
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
446 PM CDT FRI MAY 25 2007

NDC085-252200-
/O.CON.KBIS.TO.W.0010.000000T0000Z-070525T2200Z/
SIOUX ND-
446 PM CDT FRI MAY 25 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR CENTRAL
SIOUX COUNTY...

AT 445 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED JUST SOUTH OF PORCUPINE
...OR ABOUT 47 MILES SOUTH OF BISMARCK...MOVING NORTHEAST AT 15 MPH.

THE TORNADO WILL BE NEAR...
  PORCUPINE AROUND 455 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 4610 10129 4602 10109 4631 10073 4633 10097

$$

CS/HW

000 
WWUS53 KBIS 252206
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
505 PM CDT FRI MAY 25 2007

NDC085-252215-
/O.EXP.KBIS.TO.W.0010.000000T0000Z-070525T2200Z/
SIOUX ND-
505 PM CDT FRI MAY 25 2007

...THE TORNADO WARNING FOR CENTRAL SIOUX COUNTY EXPIRED AT 500 PM
CDT...

...A SEVERE THUNDERSTORM WARNING IS IN EFFECT FOR CENTRAL SIOUX
AND SOUTHEASTERN GRANT COUNTIES UNTIL 600 PM CDT OR 500 PM MDT...

THE THUNDERSTORM NO LONGER APPEARS TO BE PRODUCING A TORNADO. 
HOWEVER...LARGE HAIL REMAINS A THREAT.

LAT...LON 4610 10129 4602 10109 4631 10073 4633 10097

$$

CS/HW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 3:01 PM CDT	Severe Thunderstorm Warning	BIS	Sioux	59 min
May 25, 3:33 PM CDT	Tornado Warning	BIS	Sioux	27 min
May 25, 3:58 PM CDT	Tornado Warning	BIS	Sioux	32 min
May 25, 4:03 PM CDT	Severe Thunderstorm Warning	BIS	Grant	57 min
May 25, 4:08 PM CDT	Severe Thunderstorm Warning	BIS	Adams	52 min
May 25, 5:01 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Sioux	48 min
May 25, 5:20 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Morton	38 min
May 25, 5:22 PM CDT	Tornado Warning	BIS	Sioux	23 min

Nearby

Tornado Warnings in North Dakota, 2007 Every tornado warning in 2007 Tornadoes in 2007

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.