Alert archive / Minnesota / Tornado Warnings in 2017

Tornado Warning 28, NWS Grand Forks, ND

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

NWS Grand Forks, ND issued this tornado warning at Jul 11, 2017, 6:21 PM CDT for Marshall County, Polk County, Minnesota; Grand Forks County, Walsh County, North Dakota. It was in force for 39 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, 6:21 PM CDT (23:21 UTC)
Expired: Jul 11, 2017, 7:00 PM CDT
In force: 39 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Marshall County, MN, Polk County, MN, Grand Forks County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 73 km from the middle of the area, began a volume at 23:24 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, 6:41 PM CDT	HAIL 1.25	6 Nw Manvel, ND
Jul 11, 6:50 PM CDT	FUNNEL CLOUD	4 Nnw Manvel, ND
Jul 11, 6:50 PM CDT	TORNADO 0	4 Nnw Manvel, ND	THIS TORNADO WAS OBSERVED AND REPORTED BY SPOTTERS LOCATED NEAR MANVEL AND ALONG HWY 81 AND CR1 ABOUT 6 MILES NORTHWEST OF MANVEL. THE TORNADO TRACKED TO THE EAST FOR NEARLY 2 MILES AND CROSSED INTERSTATE 29 JUST SOUTH OF EXIT 157...BEFORE LIFTING AROUND 3.5 E
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

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, 11.4 hours before the alert went out and 295 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.

504 
WFUS53 KFGF 112321
TORFGF
MNC089-119-NDC035-099-120000-
/O.NEW.KFGF.TO.W.0028.170711T2321Z-170712T0000Z/

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

The National Weather Service in Grand Forks has issued a

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

* Until 700 PM CDT.

* At 621 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Forest River, or 15 miles south of Grafton, moving
  east 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...
  Minto and Ardoch around 630 PM CDT. 
  Warsaw around 640 PM CDT. 
  Poland around 645 PM CDT. 
  Oslo and Big Woods around 655 PM CDT. 

This includes Interstate 29 between mile markers 152 and 170.
 
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 4813 9758 4829 9762 4834 9707 4804 9703
TIME...MOT...LOC 2321Z 264DEG 22KT 4819 9743 

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

$$

Gust

2 follow-up statements

820 
WWUS53 KFGF 112338 RRA
SVSFGF

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

MNC089-119-NDC035-099-120000-
/O.CON.KFGF.TO.W.0028.000000T0000Z-170712T0000Z/
Marshall MN-Polk MN-Grand Forks ND-Walsh ND-
638 PM CDT TUE JUL 11 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
SOUTHWESTERN MARSHALL...NORTHWESTERN POLK...NORTHEASTERN GRAND FORKS
AND SOUTHEASTERN WALSH COUNTIES...
    
At 638 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Poland, or 16 miles southeast of Grafton, moving
east 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...
  Poland around 645 PM CDT. 
  Oslo around 655 PM CDT. 

This includes Interstate 29 between mile markers 152 and 165.
 
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 4812 9749 4824 9745 4828 9706 4804 9703
TIME...MOT...LOC 2338Z 264DEG 22KT 4820 9727 

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

$$

Gust

978 
WWUS53 KFGF 112354
SVSFGF

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

MNC089-119-NDC035-099-120000-
/O.CON.KFGF.TO.W.0028.000000T0000Z-170712T0000Z/
Marshall MN-Polk MN-Grand Forks ND-Walsh ND-
654 PM CDT TUE JUL 11 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
SOUTHWESTERN MARSHALL...NORTHWESTERN POLK...NORTHEASTERN GRAND FORKS
AND SOUTHEASTERN WALSH COUNTIES...
    
At 654 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Oslo, or 19 miles southeast of Grafton, moving east
at 25 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
southwestern Marshall...northwestern Polk...northeastern Grand Forks
and southeastern Walsh Counties.

This includes Interstate 29 between mile markers 152 and 165.
 
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 4808 9728 4825 9734 4828 9706 4804 9703
TIME...MOT...LOC 2354Z 264DEG 22KT 4821 9712 

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

$$

Gust

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 5:25 PM CDT	Tornado Warning	FGF	Marshall	50 min
Jul 11, 5:45 PM CDT	Severe Thunderstorm Warning	FGF	Kittson, Marshall	60 min
Jul 11, 6:16 PM CDT	Severe Thunderstorm Warning	FGF	Marshall, Polk	44 min
Jul 11, 6:36 PM CDT	Severe Thunderstorm Warning	FGF	Kittson	39 min
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, 5:35 PM CDT	Tornado Warning	FGF	Grand Forks, Walsh	40 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, 6:27 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 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.