Alert archive / North Dakota / Tornado Warnings in 2007

Tornado Warning 27, NWS Grand Forks, ND

July 15, 2007Cass County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 15, 2007, 9:29 PM CDT for Cass County, North Dakota. It was in force for 31 min. 2 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 15, 2007, 9:29 PM CDT (02:29 UTC)
Expired: Jul 15, 2007, 10:00 PM CDT
In force: 31 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), 68 km from the middle of the area, began a volume at 02:30 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	Remark
Jul 15, 9:31 PM CDT	TSTM WND GST 75	Alice, ND	TREES WERE UPROOTED AT THE ALICE CEMETARY AND TOMBSTONES WERE TIPPED OVER.
Jul 15, 9:33 PM CDT	TSTM WND GST 80	1 Sw Alice, ND	THE ROOF WAS TORN OFF A MACHINE SHED...COLLAPSING THE BUILDING ON THE EQUIPMENT INSIDE. DEBRIS WAS STREWN DOWNWIND FOR ONE-HALF MILE. A CAMPER WAS ALSO ROLLED OVER AND DESTROYED.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 15, 5:49 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.5 hours before the alert went out and 237 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: 2083 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 160 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 KFGF 160229
TORFGF
NDC017-160300-
/O.NEW.KFGF.TO.W.0027.070716T0229Z-070716T0300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
929 PM CDT SUN JUL 15 2007

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN CASS COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 1000 PM CDT

* AT 921 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 2 MILES EAST OF
  BUFFALO...OR 24 MILES EAST OF VALLEY CITY...MOVING TO THE SOUTH AT
  45 MPH.

* THE TORNADO WILL BE NEAR...
  EMBDEN AT 935 PM CDT...

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM CDT MONDAY
MORNING FOR NORTHWESTERN MINNESOTA.

LAT...LON 4717 9747 4702 9767 4665 9765 4664 9717

$$

JK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 7:20 PM CDT	Tornado Warning	FGF	Cass, Ransom	40 min
Jul 15, 7:29 PM CDT	Severe Thunderstorm Warning	FGF	Ramsey, Towner	61 min
Jul 15, 7:58 PM CDT	Tornado Warning	FGF	Ransom, Richland	23 min
Jul 15, 8:26 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy	49 min
Jul 15, 8:40 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Steele	65 min
Jul 15, 8:45 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Traill	60 min
Jul 15, 9:49 PM CDT	Tornado Warning	FGF	Ransom	26 min
Jul 15, 10:12 PM CDT	Tornado Warning	FGF	Ransom, Richland, Sargent	48 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.