Alert archive / Minnesota / Tornado Warnings in 2018

Tornado Warning 27, NWS Grand Forks, ND

August 26, 2018Clearwater County, Polk County, Minnesota

NWS Grand Forks, ND issued this tornado warning at Aug 26, 2018, 11:48 PM CDT for Clearwater County, Polk County, Minnesota. It was in force for 27 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: Aug 26, 2018, 11:48 PM CDT (04:48 UTC)
Expired: Aug 27, 2018, 12:15 AM CDT
In force: 27 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Clearwater County, MN, Polk County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 124 km from the middle of the area, began a volume at 04:46 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
Aug 26, 11:51 PM CDT	TSTM WND GST 66	2 Nw Fosston, MN	PEAK WINDS MEASURED AT THE FOSSTON AIRPORT /KFSE/. WIND SENSOR STOPPED REPORTING AT 1151 PM CDT SO ACTUAL WIND SPEEDS COULD HAVE BEEN HIGHER.
Aug 26, 11:51 PM CDT	TORNADO	3 Nne Fosston, MN	STORM DAMAGE SURVEY CONFIRMED AN EF-1 TORNADO INTERMITTENTLY TRACKED 26 MILES FROM 3 MILES NNE OF FOSSTON TO 9 MILES NNE OF LEONARD. SEVERAL CABINS AND FARM OUTBUILDINGS AND ONE HOUSE HAD DAMAGED ROOFS, SEVERAL CAMPERS AND BOATS WERE TOSSED AND DAMAGED, CROPS
Aug 27, 12:05 AM CDT	TSTM WND DMG	3 S Gonvick, MN	SEVERAL RECREATIONAL VEHICLES WERE ROLLED AND MULTIPLE TREES WERE SNAPPED OR UPROOTED AT PINE LAKE.

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
Aug 26, 9:48 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 4.8 hours before the alert went out and 203 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: 33 J/kg
Mixed-layer CIN: -321 J/kg
Mixed-layer LCL: 967 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 245 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

889 
WFUS53 KFGF 270448
TORFGF
MNC029-119-270515-
/O.NEW.KFGF.TO.W.0027.180827T0448Z-180827T0515Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Eastern ND/Grand Forks ND
1148 PM CDT SUN AUG 26 2018

The National Weather Service in Grand Forks has issued a

* Tornado Warning for...
  Southeastern Polk County in northwestern Minnesota...
  Northwestern Clearwater County in northwestern Minnesota...

* Until 1215 AM CDT.
    
* At 1148 PM CDT, a severe thunderstorm capable of producing a
  tornado was located over McIntosh, or 38 miles southeast of Thief
  River Falls, moving northeast at 60 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...
  Fosston around 1150 PM CDT.
  Olga and Trail around 1200 AM CDT.
  Gonvick and Gully around 1205 AM CDT.
  Berner around 1210 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4753 9587 4761 9595 4793 9546 4777 9530
TIME...MOT...LOC 0448Z 233DEG 51KT 4761 9584 

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

$$

CJ

2 follow-up statements

389 
WWUS53 KFGF 270500
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
1200 AM CDT MON AUG 27 2018

MNC029-119-270515-
/O.CON.KFGF.TO.W.0027.000000T0000Z-180827T0515Z/
Polk MN-Clearwater MN-
1200 AM CDT MON AUG 27 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT FOR EAST
CENTRAL POLK AND NORTHWESTERN CLEARWATER COUNTIES...
    
At 1200 AM CDT, a severe thunderstorm capable of producing a tornado
was located over Olga, or 37 miles southeast of Thief River Falls,
moving northeast at 60 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...
  Gonvick around 1205 AM CDT.
  Berner around 1210 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4762 9565 4774 9575 4793 9546 4777 9530
TIME...MOT...LOC 0500Z 233DEG 51KT 4772 9563 

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

$$

CJ

487 
WWUS53 KFGF 270512
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
1212 AM CDT MON AUG 27 2018

MNC029-119-270522-
/O.EXP.KFGF.TO.W.0027.000000T0000Z-180827T0515Z/
Polk MN-Clearwater MN-
1212 AM CDT MON AUG 27 2018

...THE TORNADO WARNING FOR EAST CENTRAL POLK AND NORTHWESTERN
CLEARWATER COUNTIES WILL EXPIRE AT 1215 AM CDT...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, damaging winds remain likely and a Severe 
Thunderstorm Warning remains in effect for the area.

A Severe Thunderstorm Watch remains in effect until 400 AM CDT for
northwestern Minnesota.

LAT...LON 4762 9565 4774 9575 4793 9546 4777 9530
TIME...MOT...LOC 0512Z 233DEG 51KT 4781 9545 

$$

CJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 9:58 PM CDT	Severe Thunderstorm Warning	FGF	Kittson, Marshall, Polk	62 min
Aug 26, 10:30 PM CDT	Special Weather Statement	FGF	Polk	45 min
Aug 26, 10:37 PM CDT	Severe Thunderstorm Warning	FGF	Marshall, Polk	23 min
Aug 26, 10:46 PM CDT	Severe Thunderstorm Warning	FGF	Norman, Polk, Red Lake	44 min
Aug 26, 10:52 PM CDT	Severe Thunderstorm Warning	FGF	Kittson, Marshall, Roseau	53 min
Aug 26, 11:12 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Mahnomen, Norman, Polk	48 min
Aug 26, 11:18 PM CDT	Special Weather Statement	FGF	Pennington, Polk, Red Lake	42 min
Aug 26, 11:45 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Lake of the Woods, Marshall, Roseau	37 min
Aug 26, 11:54 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater, Mahnomen, Polk	51 min
Aug 27, 12:30 AM CDT	Tornado Warning	FGF	Beltrami, Lake of the Woods	30 min
Aug 27, 12:38 AM CDT	Special Weather Statement	FGF	Becker, Clearwater, Mahnomen	67 min
Aug 27, 12:53 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Beltrami, Clearwater, Hubbard, Mahnomen, Polk	54 min
Aug 27, 1:25 AM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Hubbard	50 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.