Alert archive / North Dakota / Tornado Warnings in 2017

Tornado Warning 30, NWS Grand Forks, ND

July 11, 2017Grand Forks County, Steele County, Traill County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 11, 2017, 6:42 PM CDT for Grand Forks County, Steele County, Traill County, North Dakota. It was in force for 48 min. 10 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, 6:42 PM CDT (23:42 UTC)
Expired: Jul 11, 2017, 7:30 PM CDT
In force: 48 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Grand Forks County, ND, Steele County, ND, Traill County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 30 km from the middle of the area, began a volume at 23:42 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, 6:42 PM CDT	HAIL 1.75	7 Ene Northwood, ND	LARGE HAIL AND STRONG WINDS DAMAGED CROPS ACROSS SOUTHERN PLEASANT VIEW TOWNSHIP.
Jul 11, 6:42 PM CDT	TORNADO	2 E Northwood, ND	TORNADO REPORTED BY LAW ENFORCEMENT.
Jul 11, 6:53 PM CDT	HAIL 0.5	2 W Thompson, ND	MARBLE SIZED HAIL REPORTED IN RURAL THOMPSON
Jul 11, 6:55 PM CDT	TORNADO 2	8 E Hatton, ND	THIS MULTI-VORTEX TORNADO WAS WRAPPED IN RAIN AND HAIL FOR MUCH OF ITS PATH AS IT TRACKED PRIMARILY TO THE SOUTHEAST FOR OVER 22 MILES. IT CROSSED INTERSTATE 29 JUST NORTH OF THE TAFT ELEVATORS THEN DOVE SOUTH SOUTHEASTWARD TO A POINT ROUGHLY 2.5 ENE OF HILLSB
Jul 11, 6:58 PM CDT	TORNADO 2	7 E Hatton, ND	THIS MULTI-VORTEX TORNADO WAS WRAPPED IN RAIN AND HAIL FOR MUCH OF ITS PATH AS IT TRACKED PRIMARILY TO THE SOUTHEAST FOR OVER 22 MILES. IT CROSSED INTERSTATE 29 JUST NORTH OF THE TAFT ELEVATORS THEN DOVE SOUTH SOUTHEASTWARD TO A POINT ROUGHLY 2.5 ENE OF HILLSB
Jul 11, 6:59 PM CDT	HAIL 1.75	1 Ne Hatton, ND	QUARTER TO GOLF BALL SIZED HAIL NORTHEAST OF HATTON
Jul 11, 7:01 PM CDT	HAIL 1	Holmes, ND
Jul 11, 7:09 PM CDT	FUNNEL CLOUD	5 W Buxton, ND	MULTIPLE REPORTS FROM SPOTTER
Jul 11, 7:17 PM CDT	TORNADO	4 Ene Mayville, ND	LARGE RAIN-WRAPPED TORNADO VIEWED NORTHEAST OF MAYVILLE AND MOVING EAST SOUTHEAST.
Jul 11, 7:24 PM CDT	TORNADO	7 E Mayville, ND	LARGE MULTI-VORTEX TORNADO MOVING TOWARDS THE INTERSTATE NEAR CUMMINGS.

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 11, 4:48 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 11.7 hours before the alert went out and 286 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.

369 
WFUS53 KFGF 112342
TORFGF
NDC035-091-097-120030-
/O.NEW.KFGF.TO.W.0030.170711T2342Z-170712T0030Z/

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

The National Weather Service in Grand Forks has issued a

* Tornado Warning for...
  Southeastern Grand Forks County in northeastern North Dakota...
  Northwestern Traill County in southeastern North Dakota...
  Northeastern Steele County in southeastern North Dakota...

* Until 730 PM CDT.

* At 642 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Hatton, or 22 miles southwest of Grand Forks,
  moving southeast at 25 mph.

  HAZARD...Tornado and quarter size hail. 

  SOURCE...Radar indicated rotation. 

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

* This dangerous storm will be near...
  Hatton around 645 PM CDT. 
  Holmes around 700 PM CDT. 
  Reynolds around 725 PM CDT. 
  Buxton around 730 PM CDT. 

This includes Interstate 29 between mile markers 120 and 137.
 
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 4787 9750 4788 9702 4787 9702 4787 9700
      4785 9699 4748 9714 4763 9763
TIME...MOT...LOC 2342Z 293DEG 21KT 4771 9745 

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

$$

JH

2 follow-up statements

971 
WWUS53 KFGF 112348
SVSFGF

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

NDC035-091-097-120030-
/O.CON.KFGF.TO.W.0030.000000T0000Z-170712T0030Z/
Grand Forks ND-Traill ND-Steele ND-
648 PM CDT TUE JUL 11 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
SOUTHEASTERN GRAND FORKS...NORTHWESTERN TRAILL AND NORTHEASTERN
STEELE COUNTIES...
    
At 646 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Northwood, or 22 miles southwest of Grand Forks,
moving east at 25 mph.

HAZARD...TORNADO and quarter size hail. 

SOURCE...Radar indicated rotation. At 642 PM CDT, a tornado was 
         reported 2 mile east of Northwood, ND 

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

This dangerous storm will be near...
  Hatton around 650 PM CDT. 
  Holmes around 705 PM CDT. 
  Reynolds around 725 PM CDT. 
  Buxton around 730 PM CDT. 

This includes Interstate 29 between mile markers 120 and 137.
 
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 4787 9750 4788 9702 4787 9702 4787 9700
      4785 9699 4748 9714 4763 9763
TIME...MOT...LOC 2346Z 291DEG 23KT 4772 9747 

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

$$

JH

771 
WWUS53 KFGF 120014
SVSFGF

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

NDC035-091-097-120030-
/O.CON.KFGF.TO.W.0030.000000T0000Z-170712T0030Z/
Grand Forks ND-Traill ND-Steele ND-
714 PM CDT TUE JUL 11 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
SOUTHEASTERN GRAND FORKS...NORTHWESTERN TRAILL AND NORTHEASTERN
STEELE COUNTIES...
    
At 713 PM CDT, a confirmed tornado was located near Buxton, or 23
miles south of Grand Forks, moving southeast at 35 mph.

HAZARD...Damaging tornado and two inch hail. 

SOURCE...Weather spotters confirmed tornado west of buxton or 
         northeast of Mayville. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This tornado will be near...
  Buxton and Reynolds around 720 PM CDT. 

This includes Interstate 29 between mile markers 120 and 137.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4787 9750 4788 9702 4787 9702 4787 9700
      4785 9699 4748 9714 4763 9763
TIME...MOT...LOC 0013Z 297DEG 29KT 4759 9721 

TORNADO...OBSERVED
HAIL...2.00IN

$$

Gust

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, 5:15 PM CDT	Tornado Warning Tornado observed	FGF	Cavalier, Towner	45 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, 6:49 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.