Alert archive / North Dakota / Tornado Warnings in 2004

Tornado Warning 34, NWS Grand Forks, ND

July 12, 2004Cass County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 12, 2004, 9:33 PM CDT for Cass County, North Dakota. It was in force for 42 min. 9 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 12, 2004, 9:33 PM CDT (02:33 UTC)
Expired: Jul 12, 2004, 10:15 PM CDT
In force: 42 min
Issued by: NWS Grand Forks, ND
Area: Counties, with a storm outline in the text

County Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 43 km from the middle of the area, began a volume at 02:34 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.

What was reported inside it

Time	Report	Where
Jul 12, 10:00 PM CDT	HAIL 1	Argusville, ND
Jul 12, 10:00 PM CDT	HAIL 1	Argusville, ND
Jul 12, 10:00 PM CDT	HAIL 1	Argusville, ND
Jul 12, 10:00 PM CDT	HAIL 1	Argusville, ND
Jul 12, 10:00 PM CDT	HAIL 1.75	3 W Harwood, ND
Jul 12, 10:00 PM CDT	HAIL 1.75	3 W Harwood, ND
Jul 12, 10:00 PM CDT	HAIL 1.75	3 W Harwood, ND
Jul 12, 10:00 PM CDT	HAIL 1.75	3 W Harwood, ND
Jul 12, 10:00 PM CDT	HAIL 1.75	3 W Harwood, ND

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.6 hours before the alert went out and 265 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: 1108 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 1722 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KFGF 130233
TORFGF
NDC017-130315-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
932 PM CDT MON JUL 12 2004

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...

  NORTHEASTERN CASS COUNTY IN SOUTHEAST NORTH DAKOTA

* UNTIL 1015 PM CDT.

* AT 926 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH STRONG ROTATION 6 MILES SOUTHEAST OF
  HUNTER...OR ABOUT 23 MILES NORTHWEST OF FARGO...MOVING TO THE EAST
  AT 35 MPH.

* THE TORNADO WILL BE NEAR...

  GARDNER AT 935 PM AND
  ARGUSVILLE AT 940 PM.

THIS IS A DANGEROUS STORM. IF YOU ARE IN THE PATH OF THIS TORNADO
ABANDON CARS AND MOBILE HOMES FOR A STURDY BUILDING.

LAT...LON 4723 9747 4710 9749 4695 9689 4722 9687

$$
DK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 8:47 PM CDT	Severe Thunderstorm Warning	FGF	Barnes	58 min
Jul 12, 9:09 PM CDT	Severe Thunderstorm Warning	FGF	Cass	51 min

Nearby

Tornado Warnings in North Dakota, 2004 Every tornado warning in 2004 Tornadoes in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.