Alert archive / Minnesota / Tornado Warnings in 2018

Tornado Warning 24, NWS Grand Forks, ND

July 8, 2018Otter Tail County, Minnesota

NWS Grand Forks, ND issued this tornado warning at Jul 8, 2018, 7:20 PM CDT for Otter Tail County, Minnesota. It was in force for 40 min. 3 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 8, 2018, 7:20 PM CDT (00:20 UTC)
Expired: Jul 8, 2018, 8:00 PM CDT
In force: 40 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.5 in

County Otter Tail County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 150 km from the middle of the area, began a volume at 00:24 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 8, 7:20 PM CDT	FUNNEL CLOUD	9 W Vergas, MN	PERSITENT WALL CLOUD WITH MULTIPLE BRIEF FUNNELS VIEWED OVER THE DUNVILLA AREA.
Jul 8, 7:21 PM CDT	TSTM WND DMG	1 Wsw Dunvilla, MN	DAMAGE TO BUSINESS DISPLAYED BOAT LIFT CANOPY AND FLAG. MENTIONED BUSINESS CUSTOMERS AROUND THE AREA ALSO HAD DAMAGE TO NEARBY BOAT LIFTS. TIME ESTIMATED ON RADAR.
Jul 8, 7:34 PM CDT	HAIL 1.5	6 Ene Pelican Rapids, MN	LARGE HAIL ACCOMPANIED BY VERY HEAVY RAINS AND STRONG WINDS TRACKED ACROSS THE NORTH END OF LAKE LIDA.

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 8, 3:52 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.3 hours before the alert went out and 263 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: 95 J/kg
Mixed-layer CIN: -247 J/kg
Mixed-layer LCL: 1776 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

786 
WFUS53 KFGF 090020
TORFGF
MNC111-090100-
/O.NEW.KFGF.TO.W.0024.180709T0020Z-180709T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Eastern ND/Grand Forks ND
720 PM CDT SUN JUL 8 2018

The National Weather Service in Grand Forks has issued a

* Tornado Warning for...
  Northwestern Otter Tail County in west central Minnesota...

* Until 800 PM CDT.
    
* At 719 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Dunvilla, or 15 miles southwest of Detroit Lakes,
  moving east at 30 mph.

  HAZARD...Tornado and ping pong ball size hail.

  SOURCE...Radar indicated rotation.

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

* This dangerous storm will be near...
  Lake Lida around 725 PM CDT.
  Vergas and Maplewood State Park around 740 PM CDT.
  Star Lake around 745 PM CDT.
  Big McDonald Lake around 750 PM CDT.
  Dent around 755 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 4652 9620 4671 9609 4662 9557 4640 9569
TIME...MOT...LOC 0019Z 285DEG 24KT 4663 9603 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

DJR

2 follow-up statements

905 
WWUS53 KFGF 090041
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
741 PM CDT SUN JUL 8 2018

MNC111-090100-
/O.CON.KFGF.TO.W.0024.000000T0000Z-180709T0100Z/
Otter Tail MN-
741 PM CDT SUN JUL 8 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR
NORTHWESTERN OTTER TAIL COUNTY...
    
At 740 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Big McDonald Lake, or 15 miles south of Detroit
Lakes, moving east at 30 mph.

HAZARD...Tornado and two inch 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...
  Big McDonald Lake around 745 PM CDT.
  Dent around 750 PM CDT.
  Richville and Perham around 800 PM CDT.

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 4648 9603 4668 9593 4662 9557 4640 9569
TIME...MOT...LOC 0040Z 285DEG 24KT 4659 9583 

TORNADO...RADAR INDICATED
HAIL...2.00IN

$$

DJR

635 
WWUS53 KFGF 090057
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
757 PM CDT SUN JUL 8 2018

MNC111-090107-
/O.EXP.KFGF.TO.W.0024.000000T0000Z-180709T0100Z/
Otter Tail MN-
757 PM CDT SUN JUL 8 2018

...THE TORNADO WARNING FOR NORTHWESTERN OTTER TAIL COUNTY WILL EXPIRE
AT 800 PM CDT...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
west central Minnesota.

Remember, a Severe Thunderstorm Warning still remains in effect for
Otter Tail county.

LAT...LON 4648 9603 4668 9593 4662 9557 4640 9569
TIME...MOT...LOC 0057Z 285DEG 24KT 4656 9569 

$$

DJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 7:02 PM CDT	Tornado Warning	FGF	Becker, Otter Tail	43 min
Jul 8, 7:11 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Otter Tail	22 min
Jul 8, 7:21 PM CDT	Special Weather Statement	FGF	Wilkin	39 min
Jul 8, 7:27 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Hubbard, Otter Tail, Wadena	63 min
Jul 8, 7:37 PM CDT	Severe Thunderstorm Warning	FGF	Clay, Wilkin	23 min
Jul 8, 8:04 PM CDT	Severe Thunderstorm Warning	FGF	Otter Tail	26 min
Jul 8, 8:26 PM CDT	Severe Thunderstorm Warning	FGF	Otter Tail, Wadena	34 min
Jul 8, 8:36 PM CDT	Severe Thunderstorm Warning	FGF	Otter Tail	24 min
Jul 8, 8:59 PM CDT	Special Weather Statement	FGF	Otter Tail, Wadena	61 min

Nearby

Tornado Warnings in Minnesota, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.