Alert archive / North Dakota / Tornado Warnings in 2018

Tornado Warning 15, NWS Grand Forks, ND

June 29, 2018Grand Forks County, Nelson County, Steele County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jun 29, 2018, 3:40 AM CDT for Grand Forks County, Nelson County, Steele County, North Dakota. It was in force for 35 min. 5 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, 3:40 AM CDT (08:40 UTC)
Expired: Jun 29, 2018, 4:15 AM CDT
In force: 35 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Grand Forks County, ND, Nelson County, ND, Steele County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 42 km from the middle of the area, began a volume at 08:44 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, 3:52 AM CDT	TSTM WND GST 105	3 Nne Northwood, ND	A BOWING SECTION OF A SQUALL LINE APPEARS TO HAVE CUT ACROSS ACROSS EAST CENTRAL AVON TOWNSHIP. EXTREME WIND DAMAGE EXTENDED TO THE NORTH-NORTHEAST TO AROUND 7 MILES SOUTH OF ARVILLA BY 357 AM CDT. LARGE TREES WERE SNAPPED OR SHEARED IN MULTIPLE SHELTER BELTS
Jun 29, 3:52 AM CDT	TORNADO 1	2 N Northwood, ND	A BOWING SECTION OF A SQUALL LINE APPEARS TO HAVE SPAWNED TWO BRIEF TORNADOES ACROSS PORTIONS OF AVON TOWNSHIP. THIS FIRST TORNADO TRACKED TO THE NORTHEAST FOR ROUGHLY FOUR MILES, AND LIKELY ENDED ABOUT 7 MILES SOUTH OF ARVILLA BY 357 AM CDT. LARGE TREES WERE
Jun 29, 3:55 AM CDT	TSTM WND GST 95	5 N Northwood, ND	AN EMBEDDED MICROBURST INITIATED IN THE BOWING SECTION OF A SQUALL LINE AS IT MOVED INTO AVON TOWNSHIP. EXTREME WIND DAMAGE WAS APPARENT EXTENDING NORTHWARD ACROSS NORTHWEST AVON TOWNSHIP. TREES WERE BROKEN DOWN IN SHELTER BELTS AND 3 CATTLE TRAILERS WERE OVER
Jun 29, 3:55 AM CDT	TORNADO 1	5 N Northwood, ND	A BRIEF TORNADO INITIATED TO THE NORTH OF A BOWING SECTION OF A SQUALL LINE AS IT MOVED INTO AVON TOWNSHIP. EXTREME WIND DAMAGE WAS APPARENT EXTENDING NORTHWARD FOR ROUGHLY 2 MILES, TO AROUND 5SSE OF LARIMORE BY 358 AM CDT. TREES WERE BROKEN DOWN IN SHELTER BE
Jun 29, 3:55 AM CDT	TORNADO 1	5 N Northwood, ND	THIS TORNADO DEVELOP TO THE NORTH OF THE BOWING SECTION OF A SQUALL LINE IN AVON TOWNSHIP. IT APPEARS TO HAVE TRACKED NEARLY DUE NORTH FOR ROUGHLY 3 MILES, ENDING AROUND 6 MILES SOUTHWEST OF ARVILLA BY 359 AM CDT. TREES WERE BROKEN DOWN IN SHELTER BELTS AND 3

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

Bismarck Municip, ND (KBIS), launched 00:00Z, 8.7 hours before the alert went out and 248 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: 2612 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1800 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 11.7

Open this sounding in Storm Lab

The text

As transmitted.

937 
WFUS53 KFGF 290840
TORFGF
NDC035-063-091-290915-
/O.NEW.KFGF.TO.W.0015.180629T0840Z-180629T0915Z/

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

The National Weather Service in Grand Forks has issued a

* Tornado Warning for...
  Southwestern Grand Forks County in northeastern North Dakota...
  Southeastern Nelson County in northeastern North Dakota...
  Northwestern Steele County in southeastern North Dakota...

* Until 415 AM CDT.
    
* At 340 AM CDT, a severe thunderstorm capable of producing a tornado
  was located near Sharon, or 41 miles southwest of Grand Forks,
  moving northeast at 50 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

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

* This dangerous storm will be near...
  Northwood around 355 AM CDT.
  Kempton around 400 AM CDT.
  Larimore around 405 AM CDT.
  Arvilla and Turtle River State Park around 410 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 4798 9756 4784 9735 4758 9786 4766 9799
      4767 9799 4767 9800
TIME...MOT...LOC 0840Z 227DEG 47KT 4767 9788 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Knutsvig

3 follow-up statements

383 
WWUS53 KFGF 290848
SVSFGF

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

NDC063-091-290858-
/O.CAN.KFGF.TO.W.0015.000000T0000Z-180629T0915Z/
Nelson ND-Steele ND-
348 AM CDT FRI JUN 29 2018

...THE TORNADO WARNING FOR SOUTHEASTERN NELSON AND NORTHWESTERN
STEELE COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 AM CDT for
northeastern North Dakota.

LAT...LON 4798 9756 4784 9735 4768 9768 4768 9785
      4774 9786 4778 9783
TIME...MOT...LOC 0848Z 223DEG 50KT 4776 9774 

$$

NDC035-290915-
/O.CON.KFGF.TO.W.0015.000000T0000Z-180629T0915Z/
Grand Forks ND-
348 AM CDT FRI JUN 29 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 AM CDT FOR
SOUTHWESTERN GRAND FORKS COUNTY...
    
At 348 AM CDT, a severe thunderstorm capable of producing a tornado
was located near Logan Center, or 32 miles west of Grand Forks,
moving northeast at 50 mph.

HAZARD...TORNADO.

SOURCE...Radar indicated rotation.

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

This dangerous storm will be near...
  Kempton and Northwood around 355 AM CDT.
  Larimore around 400 AM CDT.
  Arvilla and Turtle River State Park around 405 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 4798 9756 4784 9735 4768 9768 4768 9785
      4774 9786 4778 9783
TIME...MOT...LOC 0848Z 223DEG 50KT 4776 9774 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Knutsvig

010 
WWUS53 KFGF 290902
SVSFGF

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

NDC035-290915-
/O.CON.KFGF.TO.W.0015.000000T0000Z-180629T0915Z/
Grand Forks ND-
402 AM CDT FRI JUN 29 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 AM CDT FOR
SOUTHWESTERN GRAND FORKS COUNTY...
    
At 402 AM CDT, a severe thunderstorm capable of producing a tornado
was located over Arvilla, or 21 miles west of Grand Forks, moving
northeast at 50 mph.

HAZARD...TORNADO.

SOURCE...Radar indicated rotation.

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

This dangerous storm will be near...
  Arvilla and Turtle River State Park around 405 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 4798 9756 4784 9735 4777 9753 4786 9770
TIME...MOT...LOC 0902Z 227DEG 47KT 4789 9753 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Knutsvig

843 
WWUS53 KFGF 290906
SVSFGF

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

NDC035-290916-
/O.EXP.KFGF.TO.W.0015.000000T0000Z-180629T0915Z/
Grand Forks ND-
406 AM CDT FRI JUN 29 2018

...THE TORNADO WARNING FOR SOUTHWESTERN GRAND FORKS COUNTY WILL
EXPIRE AT 415 AM 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 800 AM CDT for
northeastern North Dakota.

LAT...LON 4798 9756 4784 9735 4777 9753 4786 9770
TIME...MOT...LOC 0906Z 227DEG 47KT 4792 9748 

$$

Knutsvig

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 8:17 PM CDT	Severe Thunderstorm Warning	FGF	Benson	28 min
Jun 29, 1:48 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey, Towner	57 min
Jun 29, 2:08 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Ramsey	67 min
Jun 29, 2:27 AM CDT	Tornado Warning	FGF	Benson, Ramsey	14 min
Jun 29, 2:44 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Towner	46 min
Jun 29, 2:45 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey, Towner	45 min
Jun 29, 2:59 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Grand Forks, Griggs, Steele, Traill	61 min
Jun 29, 3:15 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Grand Forks, Griggs, Nelson, Ramsey and 2 more	60 min
Jun 29, 3:16 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Ransom, Sargent	59 min
Jun 29, 3:30 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Ramsey, Towner, Walsh	45 min
Jun 29, 3:31 AM CDT	Special Weather Statement	FGF	Towner	29 min
Jun 29, 3:51 AM CDT	Severe Thunderstorm Warning	FGF	Cass, Grand Forks, Steele, Traill	54 min
Jun 29, 3:58 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Nelson, Walsh	47 min
Jun 29, 4:06 AM CDT	Severe Thunderstorm Warning	FGF	Cass, Ransom, Richland, Sargent	54 min
Jun 29, 4:25 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Traill, Walsh	65 min
Jun 29, 4:57 AM CDT	Severe Thunderstorm Warning	FGF	Richland	63 min
Jun 29, 5:05 AM CDT	High Wind Warning	FGF	Benson, Cavalier, Eddy, Grand Forks, Griggs, Nelson and 5 more	4 hr

Nearby

Tornado Warnings in North Dakota, 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.