Alert archive / Minnesota / Tornado Warnings in 2017

Tornado Warning 31, NWS Grand Forks, ND

July 11, 2017Polk County, Minnesota; Grand Forks County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 11, 2017, 7:02 PM CDT for Polk County, Minnesota; Grand Forks County, North Dakota. It was in force for 43 min. 4 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, 7:02 PM CDT (00:02 UTC)
Expired: Jul 11, 2017, 7:45 PM CDT
In force: 43 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Polk County, MN, Grand Forks County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 67 km from the middle of the area, began a volume at 00:01 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, 7:07 PM CDT	TORNADO 1	6 Ssw Alvarado, MN	THIS TORNADO TRACKED INTERMITTENTLY FOR NEARLY 10 MILES ACROSS NORTHERN NORTHLAND AND TABOR TOWNSHIPS... AND LIFTED AROUND 3 MILES EAST OF TABOR BY 730 PM CDT. THE TORNADO SNAPPED OR UPROOTED A FEW SPRUCE TREES AND BROKE DOWN NUMEROUS LARGE BRANCHES IN SHELTER
Jul 11, 7:23 PM CDT	HAIL 1.75	2 N Tabor, MN	HAIL UP TO GOLF BALL SIZED FELL ACROSS NORTHWEST TOBOR TOWNSHIP.
Jul 11, 7:54 PM CDT	FUNNEL CLOUD	3 Ne Euclid, MN	PERSISTENT ALL CLOUD WITH POSSIBLE FUNNEL.
Jul 11, 7:54 PM CDT	FUNNEL CLOUD	4 Ne Euclid, MN	PERSISTENT WALL CLOUD WITH POSSIBLE FUNNEL.

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

International Fa, MN (KINL), launched 00:00Z, 0.0 hours before the alert went out and 271 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: 841 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 374 m²/s²
0-3 km storm-relative helicity: 636 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

921 
WFUS53 KFGF 120002
TORFGF
MNC119-NDC035-120045-
/O.NEW.KFGF.TO.W.0031.170712T0002Z-170712T0045Z/

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

The National Weather Service in Grand Forks has issued a

* Tornado Warning for...
  Northwestern Polk County in northwestern Minnesota...
  Northeastern Grand Forks County in northeastern North Dakota...

* Until 745 PM CDT.

* At 701 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Manvel, or 12 miles north of Grand Forks, 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 dangerous storm will be near...
  Tabor around 720 PM CDT. 
  Sherack around 725 PM CDT. 
  Angus around 730 PM CDT. 
  Euclid around 740 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 4804 9712 4817 9718 4817 9651 4786 9651
TIME...MOT...LOC 0001Z 291DEG 32KT 4810 9710 

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

$$

Gust

2 follow-up statements

630 
WWUS53 KFGF 120017
SVSFGF

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

NDC035-120026-
/O.CAN.KFGF.TO.W.0031.000000T0000Z-170712T0045Z/
Grand Forks ND-
717 PM CDT TUE JUL 11 2017

...THE TORNADO WARNING FOR NORTHEASTERN GRAND FORKS COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 1100 PM CDT for northwestern
Minnesota.

LAT...LON 4804 9700 4815 9697 4817 9651 4786 9651
TIME...MOT...LOC 0016Z 282DEG 25KT 4808 9690 

$$

MNC119-120045-
/O.CON.KFGF.TO.W.0031.000000T0000Z-170712T0045Z/
Polk MN-
717 PM CDT TUE JUL 11 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
NORTHWESTERN POLK COUNTY...
    
At 716 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Tabor, or 13 miles northeast of Grand Forks, moving
east at 30 mph.

HAZARD...Tornado and golf ball size hail. 

SOURCE...Radar indicated rotation. 

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 dangerous storm will be near...
  Tabor around 720 PM CDT. 
  Sherack around 730 PM CDT. 
  Angus around 735 PM CDT. 
  Euclid around 745 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4804 9700 4815 9697 4817 9651 4786 9651
TIME...MOT...LOC 0016Z 282DEG 25KT 4808 9690 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

Gust

432 
WWUS53 KFGF 120033
SVSFGF

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

MNC119-120045-
/O.CON.KFGF.TO.W.0031.000000T0000Z-170712T0045Z/
Polk MN-
733 PM CDT TUE JUL 11 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
NORTHWESTERN POLK COUNTY...
    
At 732 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Sherack, or 16 miles northeast of Grand Forks,
moving east at 35 mph.

HAZARD...Tornado and golf ball size hail. 

SOURCE...Radar indicated rotation. 

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 dangerous storm will be near...
  Sherack around 735 pm CDT.
  Angus around 740 PM CDT.  
  Euclid around 745 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4801 9692 4815 9689 4817 9651 4786 9651
TIME...MOT...LOC 0032Z 286DEG 31KT 4805 9677 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

Gust

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 7:12 PM CDT	Severe Thunderstorm Warning	FGF	Marshall, Polk	36 min
Jul 11, 7:19 PM CDT	Tornado Warning Tornado observed	FGF	Norman, Polk	41 min
Jul 11, 7:47 PM CDT	Tornado Warning	FGF	Pennington, Polk, Red Lake	27 min
Jul 11, 7:59 PM CDT	Tornado Warning	FGF	Clay, Norman, Polk	46 min
Jul 11, 8:19 PM CDT	Severe Thunderstorm Warning	FGF	Pennington, Polk, Red Lake	56 min
Jul 11, 8:34 PM CDT	Tornado Warning	FGF	Becker, Clay, Mahnomen, Norman	41 min
Jul 11, 9:14 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Mahnomen, Norman, Otter Tail	61 min
Jul 11, 9:25 PM CDT	Severe Thunderstorm Warning	FGF	Grant	35 min
Jul 11, 9:43 PM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail	62 min
Jul 11, 10:08 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Hubbard, Otter Tail, Wadena	67 min
Jul 11, 10:38 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Otter Tail	67 min
Jul 11, 7:10 PM CDT	Areal Flood Advisory	FGF	Grand Forks	110 min
Jul 11, 7:30 PM CDT	Severe Thunderstorm Warning	FGF	Pembina	41 min

Nearby

Tornado Warnings in Minnesota, 2017 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.