Alert archive / Minnesota / Tornado Warnings in 2018

Tornado Warning 16, NWS Grand Forks, ND

June 29, 2018Norman County, Minnesota

NWS Grand Forks, ND issued this tornado warning at Jun 29, 2018, 4:31 AM CDT for Norman County, Minnesota. It was in force for 29 min. 2 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: Jun 29, 2018, 4:31 AM CDT (09:31 UTC)
Expired: Jun 29, 2018, 5:00 AM CDT
In force: 29 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Norman County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 71 km from the middle of the area, began a volume at 09:32 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
Jun 29, 4:48 AM CDT	TORNADO 1	1 N Twin Valley, MN	THIS TORNADO WAS LIKELY WRAPPED IN DOWNBURST WINDS AND HEAVY RAIN. IT APPEARS TO HAVE TRACKED EASTWARD FOR A MILE OR SO TO ABOUT 1.5 NE OF TWIN VALLEY BY 450 AM CDT. LARGE TREES WERE BROKEN DOWN AND FLUNG IN VARIOUS DIRECTIONS, BUT MAINLY TO THE NORTHEAST AND
Jun 29, 4:50 AM CDT	TSTM WND DMG	Ne Twin Valley, MN	TWO LARGE TREES UPROOTED. VIA PHOTO ON SOCIAL MEDIA. TIME ESTIMATED ON RADAR.

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
Jun 28, 10:54 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 9.5 hours before the alert went out and 272 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: 968 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1276 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

As transmitted.

788 
WFUS53 KFGF 290931
TORFGF
MNC107-291000-
/O.NEW.KFGF.TO.W.0016.180629T0931Z-180629T1000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Eastern ND/Grand Forks ND
431 AM CDT FRI JUN 29 2018

The National Weather Service in Grand Forks has issued a

* Tornado Warning for...
  Northeastern Norman County in northwestern Minnesota...

* Until 500 AM CDT.
    
* At 430 AM CDT, a severe thunderstorm capable of producing a tornado
  was located near Ada, or 31 miles north of Fargo, moving east 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...
  Ada around 435 AM CDT.
  Gary and Twin Valley around 445 AM CDT.
  Waukon, Faith and Ranum around 455 AM 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 4725 9667 4736 9668 4749 9608 4722 9608
TIME...MOT...LOC 0930Z 264DEG 53KT 4731 9661 

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

$$

TG

2 follow-up statements

410 
WWUS53 KFGF 290944 RRA
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
444 AM CDT FRI JUN 29 2018

MNC107-291000-
/O.CON.KFGF.TO.W.0016.000000T0000Z-180629T1000Z/
Norman MN-
444 AM CDT FRI JUN 29 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 AM CDT FOR EAST
CENTRAL NORMAN COUNTY...
    
At 444 AM CDT, a severe thunderstorm capable of producing a tornado
was located near Gary, or 39 miles northeast of Fargo, moving east at
60 mph.

HAZARD...TORNADO.

SOURCE...Radar indicated rotation.

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

This dangerous storm will be near...
  Gary and Twin Valley around 445 AM CDT.
  Waukon around 450 AM CDT.
  Faith around 455 AM 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 4723 9637 4737 9637 4745 9608 4722 9608
TIME...MOT...LOC 0944Z 264DEG 53KT 4733 9630 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

TG

315 
WWUS53 KFGF 291000
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
500 AM CDT FRI JUN 29 2018

MNC107-291010-
/O.EXP.KFGF.TO.W.0016.000000T0000Z-180629T1000Z/
Norman MN-
500 AM CDT FRI JUN 29 2018

...THE TORNADO WARNING FOR SOUTHEASTERN NORMAN COUNTY HAS EXPIRED...
    
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 800 AM CDT for
northwestern Minnesota.

LAT...LON 4723 9637 4737 9637 4745 9608 4722 9608
TIME...MOT...LOC 1000Z 264DEG 53KT 4735 9600 

$$

TG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 3:51 AM CDT	Severe Thunderstorm Warning	FGF	Clay, Norman, Polk	54 min
Jun 29, 3:58 AM CDT	Severe Thunderstorm Warning	FGF	Marshall, Polk	47 min
Jun 29, 4:06 AM CDT	Severe Thunderstorm Warning	FGF	Clay, Otter Tail, Wilkin	54 min
Jun 29, 4:25 AM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater, Kittson, Marshall, Pennington, Polk and 2 more	65 min
Jun 29, 4:32 AM CDT	Tornado Warning	FGF	Mahnomen, Norman, Polk	28 min
Jun 29, 4:42 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Clearwater, Mahnomen, Norman, Polk	63 min
Jun 29, 4:57 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Hubbard, Otter Tail, Wadena, Wilkin	63 min
Jun 29, 4:59 AM CDT	Tornado Warning	FGF	Clearwater, Polk	31 min
Jun 29, 5:05 AM CDT	High Wind Warning	FGF	Kittson, Marshall	4 hr
Jun 29, 5:23 AM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater	67 min
Jun 29, 5:36 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Clearwater, Hubbard	54 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.