Alert archive / North Dakota / Tornado Warnings in 2007

Tornado Warning 2, NWS Bismarck, ND

May 6, 2007Grant County, North Dakota

NWS Bismarck, ND issued this tornado warning at May 6, 2007, 12:15 PM MDT for Grant 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 6, 2007, 12:15 PM MDT (18:15 UTC)
Expired: May 6, 2007, 12:45 PM MDT
In force: 30 min
Issued by: NWS Bismarck, ND
Area: Counties, with a storm outline in the text

County Grant County, ND

The radar

The Bismarck radar (KBIS), 87 km from the middle of the area, began a volume at 18:16 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 6, 12:07 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 6.3 hours before the alert went out and 90 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: 659 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 562 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 288 m²/s²
0-3 km storm-relative helicity: 292 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 6.0

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KBIS 061815
TORBIS
NDC037-061845-
/O.NEW.KBIS.TO.W.0002.070506T1815Z-070506T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BISMARCK ND
1215 PM MDT SUN MAY 6 2007

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

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

* UNTIL 1245 PM MDT

* AT 1208 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 19 MILES
  SOUTHWEST OF ST. GERTRUDE...OR ABOUT 64 MILES SOUTHWEST OF
  BISMARCK...MOVING NORTHEAST AT 35 MPH.

* THE TORNADO WILL BE NEAR...
  ST. GERTRUDE AROUND 1240 PM MDT...
  RALEIGH AND 6 MILES SOUTH OF LARK AROUND 1245 PM MDT...

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 PM MDT SUNDAY EVENING FOR
EASTERN NORTH DAKOTA.

LAT...LON 4610 10175 4604 10153 4630 10124 4648 10141

$$

RSL

1 follow-up statement

000 
WWUS53 KBIS 061824
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
123 PM CDT SUN MAY 6 2007

NDC037-061845-
/O.CON.KBIS.TO.W.0002.000000T0000Z-070506T1845Z/
GRANT ND-
1223 PM MDT SUN MAY 6 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 PM MDT FOR CENTRAL
GRANT COUNTY...

AT 1216 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A POSSIBLE TORNADO.  THIS TORNADO WAS LOCATED 14 MILES 
SOUTHWEST OF ST. GERTRUDE...OR ABOUT 59 MILES SOUTHWEST OF 
BISMARCK...MOVING NORTHEAST AT 35 MPH.

THE TORNADO WILL BE NEAR...
  ST. GERTRUDE AROUND 1240 PM MDT...
  RALEIGH AROUND 1245 PM MDT...

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 PM MDT SUNDAY EVENING FOR
EASTERN NORTH DAKOTA.

LAT...LON 4610 10175 4604 10153 4630 10124 4648 10141

$$

RSL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 7:35 PM MDT	Flash Flood Warning	BIS	Dickey, LaMoure	6 hr
May 6, 1:21 AM MDT	Flash Flood Warning	BIS	Dickey, LaMoure	4 hr
May 6, 11:58 AM MDT	Severe Thunderstorm Warning	BIS	Grant, Sioux	62 min
May 6, 12:46 PM MDT	Tornado Warning	BIS	Grant, Morton	29 min
May 6, 3:38 PM MDT	Severe Thunderstorm Warning	BIS	Pierce	21 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.