Alert archive / North Dakota / Tornado Warnings in 2017

Tornado Warning 23, NWS Grand Forks, ND

July 11, 2017Cavalier County, Towner County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 11, 2017, 5:15 PM CDT for Cavalier County, Towner County, North Dakota. It was in force for 45 min. 6 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 11, 2017, 5:15 PM CDT (22:15 UTC)
Expired: Jul 11, 2017, 6:00 PM CDT
In force: 45 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Observed
Hail: 1.0 in

Counties Cavalier County, ND, Towner County, ND

The radar

The Minot AFB radar (KMBX), 143 km from the middle of the area, began a volume at 22:16 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.

What was reported inside it

Time	Report	Where	Remark
Jul 11, 5:16 PM CDT	TORNADO 0	4 E Rocklake, ND	THE FUNNEL WHICH PRECEDED THIS TORNADO WAS VIEWED BY MULTIPLE STORM SPOTTERS. PHOTOGRAPHS AND REPORTS SHOW THAT THIS TORNADO TRACKED ESE FOR ABOUT 2 MILES OVER MAINLY OPENED RANGELAND AND LIFTED BY 520 PM CDT AROUN 6 ESE ROCKLAKE. PEAK WINDS ESTIMATED TO 70 MP
Jul 11, 5:16 PM CDT	TORNADO 0	4 E Rocklake, ND	THE FUNNEL WHICH PRECEDED THIS TORNADO WAS VIEWED BY MULTIPLE STORM SPOTTERS. THE TORNADO LIKELY TOUCHED DOWN AND TRACKED EASTWARD FOR A HALF MILE OR LESS THROUGH MAINLY OPENED COUNTRY AND LIFTED BY 518 PM CDT. PEAK WINDS ESTIMATED TO 70 MPH. MAXIMUM WIDTH EST
Jul 11, 5:36 PM CDT	HAIL 1.75	2 Nne Clyde, ND
Jul 11, 5:48 PM CDT	TORNADO 0	5 E Clyde, ND	BRIEF TOUCHDOWN NOTED BY OBSERVER NEAR THE CORNER OF CR5 AND CR20. TORNADO LIKELY TRACKED OVER OPENED COUNTRY FOR LESS THAN A HALF MILE AND LIFTED BY 518 PM CDT. MAXIMUM WINDS ESTIMATED TO 70 MPH. MAXIMUM WIDTH TO 100 YARDS. TIME ESTIMATED BASED ON RADAR.
Jul 11, 5:48 PM CDT	TORNADO 0	5 E Clyde, ND	BRIEF TOUCHDOWN NOTED BY OBSERVER NEAR THE CORNER OF CR5 AND CR20. TORNADO LIKELY TRACKED OVER OPENED COUNTRY FOR LESS THAN A HALF MILE AND LIFTED BY 550 PM CDT. MAXIMUM WINDS ESTIMATED TO 70 MPH. MAXIMUM WIDTH TO 100 YARDS. TIME ESTIMATED BASED ON RADAR.
Jul 11, 5:50 PM CDT	HAIL 1.75	10 E Clyde, ND	LARGE HAIL FELL FOR NEARLY 10 MINUTES. LARGE BRANCHES WERE BROKEN DOWN IN SHELTER BELTS AROUND WESTERN MOSCOW TOWNSHIP.

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

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 10.3 hours before the alert went out and 256 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: 34 J/kg
Mixed-layer CIN: -303 J/kg
Mixed-layer LCL: 2064 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

085 
WFUS53 KFGF 112215
TORFGF
NDC019-095-112300-
/O.NEW.KFGF.TO.W.0023.170711T2215Z-170711T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Eastern ND/Grand Forks ND
515 PM CDT TUE JUL 11 2017

The National Weather Service in Grand Forks has issued a

* Tornado Warning for...
  Northeastern Towner County in northeastern North Dakota...
  Southwestern Cavalier County in northeastern North Dakota...

* Until 600 PM CDT.

* At 515 PM CDT, a confirmed tornado was located near Rocklake, or 33
  miles west of Langdon, moving east at 35 mph.

  HAZARD...Tornado and quarter size hail. 

  SOURCE...Weather spotters confirmed tornado. 

  IMPACT...Expect damage to mobile homes, roofs, and vehicles. 

* The tornado will be near...
  Calvin around 525 PM CDT. 
  Clyde around 530 PM CDT. 
  Munich around 540 PM CDT. 
  Alsen around 550 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Grand Forks.

&&

LAT...LON 4874 9931 4891 9923 4888 9852 4856 9862
TIME...MOT...LOC 2215Z 285DEG 31KT 4879 9912 

TORNADO...OBSERVED
HAIL...1.00IN

$$

JH

1 follow-up statement

114 
WWUS53 KFGF 112242
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
542 PM CDT TUE JUL 11 2017

NDC019-095-112300-
/O.CON.KFGF.TO.W.0023.000000T0000Z-170711T2300Z/
Towner ND-Cavalier ND-
542 PM CDT TUE JUL 11 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR
NORTHEASTERN TOWNER AND SOUTHWESTERN CAVALIER COUNTIES...
    
At 541 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Clyde, or 19 miles west of Langdon, moving east at
35 mph.

HAZARD...TORNADO and quarter size hail. 

SOURCE...Radar indicated rotation. 

IMPACT...Expect damage to mobile homes, roofs, and vehicles. 

This tornadic thunderstorm will remain over mainly rural areas of
northeastern Towner and southwestern Cavalier Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

&&

LAT...LON 4874 9931 4891 9923 4888 9852 4856 9862
TIME...MOT...LOC 2241Z 280DEG 30KT 4876 9880 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

JH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 5:09 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Nelson	66 min
Jul 11, 5:25 PM CDT	Tornado Warning	FGF	Walsh	50 min
Jul 11, 5:35 PM CDT	Tornado Warning	FGF	Grand Forks, Walsh	40 min
Jul 11, 5:45 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	60 min
Jul 11, 5:46 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	59 min
Jul 11, 5:48 PM CDT	Tornado Warning	FGF	Cavalier, Ramsey, Walsh	42 min
Jul 11, 6:01 PM CDT	Tornado Warning	FGF	Grand Forks	44 min
Jul 11, 6:16 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Walsh	44 min
Jul 11, 6:21 PM CDT	Tornado Warning	FGF	Grand Forks, Walsh	39 min
Jul 11, 6:27 PM CDT	Tornado Warning	FGF	Cavalier, Pembina, Walsh	48 min
Jul 11, 6:42 PM CDT	Tornado Warning	FGF	Grand Forks, Steele, Traill	48 min
Jul 11, 6:49 PM CDT	Areal Flood Advisory	FGF	Walsh	2 hr

Nearby

Tornado Warnings in North Dakota, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.