Alert archive / North Dakota / Tornado Warnings in 2020

Tornado Warning 27, NWS Grand Forks, ND

August 9, 2020Cavalier County, Pembina County, Walsh County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Aug 9, 2020, 11:42 AM CDT for Cavalier County, Pembina County, Walsh County, North Dakota. It was in force for 36 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 9, 2020, 11:42 AM CDT (16:42 UTC)
Expired: Aug 9, 2020, 12:18 PM CDT
In force: 36 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Cavalier County, ND, Pembina County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 128 km from the middle of the area, began a volume at 16:43 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 9, 11:50 AM CDT	TSTM WND DMG	Milton, ND	A FEW LARGE TREE BRANCHES BROKEN DOWN AROUND TOWN.
Aug 9, 12:05 PM CDT	HAIL 1.25	1 S Mountain, ND	A FEW HAIL LARGER THAN QUARTERS. MOST WERE DIME TO NICKEL SIZED.
Aug 9, 12:05 PM CDT	HAIL 1.25	1 S Mountain, ND	A FEW HAIL LARGER THAN QUARTERS. MOST WERE DIME TO NICKEL SIZED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 4.7 hours before the alert went out and 285 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: 2140 J/kg
Mixed-layer CIN: -174 J/kg
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

As transmitted.

230 
WFUS53 KFGF 091642
TORFGF
NDC019-067-099-091730-
/O.NEW.KFGF.TO.W.0027.200809T1642Z-200809T1730Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Grand Forks ND
1142 AM CDT Sun Aug 9 2020

The National Weather Service in Grand Forks has issued a

* Tornado Warning for...
  Southeastern Cavalier County in northeastern North Dakota...
  Northwestern Walsh County in northeastern North Dakota...
  Southwestern Pembina County in northeastern North Dakota...

* Until 1230 PM CDT.
    
* At 1141 AM CDT, a severe thunderstorm capable of producing a
  tornado was located over Osnabrock, or 13 miles southeast of
  Langdon, moving east at 40 mph.

  HAZARD...Tornado and quarter size hail.

  SOURCE...Radar indicated rotation.

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

* Locations impacted include...
  Hoople, Edinburg, Crystal, Osnabrock, Mountain, Hensel and Milton. 

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 4854 9831 4872 9823 4871 9751 4842 9770
TIME...MOT...LOC 1641Z 278DEG 33KT 4863 9814 

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

$$

CJ

2 follow-up statements

563 
WWUS53 KFGF 091703
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
1203 PM CDT Sun Aug 9 2020

NDC019-067-099-091730-
/O.CON.KFGF.TO.W.0027.000000T0000Z-200809T1730Z/
Cavalier ND-Walsh ND-Pembina ND-
1203 PM CDT Sun Aug 9 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1230 PM CDT FOR
SOUTHEASTERN CAVALIER...NORTH CENTRAL WALSH AND SOUTHWESTERN PEMBINA
COUNTIES...
    
At 1203 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Gardar, or 23 miles northwest of Grafton, moving
east at 40 mph.

HAZARD...TORNADO and half dollar size hail.

SOURCE...Radar indicated rotation.

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

Locations impacted include...
Hoople, Edinburg, Crystal, Mountain, Hensel, Milton and Gardar. 

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 4851 9815 4872 9798 4871 9751 4842 9770
TIME...MOT...LOC 1703Z 278DEG 33KT 4860 9783 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

CJ

377 
WWUS53 KFGF 091718
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
1218 PM CDT Sun Aug 9 2020

NDC019-067-099-091728-
/O.CAN.KFGF.TO.W.0027.000000T0000Z-200809T1730Z/
Cavalier ND-Walsh ND-Pembina ND-
1218 PM CDT Sun Aug 9 2020

...THE TORNADO WARNING FOR SOUTHEASTERN CAVALIER...NORTH CENTRAL
WALSH AND SOUTHWESTERN PEMBINA COUNTIES IS CANCELLED...
    
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 700 PM CDT for
northeastern North Dakota.

LAT...LON 4851 9815 4872 9798 4871 9751 4842 9770
TIME...MOT...LOC 1716Z 278DEG 33KT 4858 9762 

$$

CJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 4:29 AM CDT	Special Weather Statement	FGF	Richland	61 min
Aug 9, 5:31 AM CDT	Special Weather Statement	FGF	Ransom	59 min
Aug 9, 6:01 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey	59 min
Aug 9, 6:57 AM CDT	Special Weather Statement	FGF	Benson, Ramsey	48 min
Aug 9, 9:09 AM CDT	Special Weather Statement	FGF	Grand Forks	66 min
Aug 9, 9:51 AM CDT	Special Weather Statement	FGF	Walsh	54 min
Aug 9, 10:12 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Nelson, Ramsey, Walsh	63 min
Aug 9, 10:24 AM CDT	Special Weather Statement	FGF	Cavalier, Towner	66 min
Aug 9, 11:05 AM CDT	Special Weather Statement	FGF	Walsh	55 min
Aug 9, 11:24 AM CDT	Special Weather Statement	FGF	Cavalier, Pembina	66 min
Aug 9, 11:28 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina, Walsh	62 min
Aug 9, 12:21 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina, Walsh	54 min
Aug 9, 12:27 PM CDT	Special Weather Statement	FGF	Grand Forks, Nelson, Walsh	63 min
Aug 9, 1:29 PM CDT	Special Weather Statement	FGF	Grand Forks	61 min
Aug 9, 1:39 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Walsh	66 min
Aug 9, 2:10 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Traill	65 min
Aug 9, 2:14 PM CDT	Tornado Warning	FGF	Barnes, Cass	18 min
Aug 9, 2:25 PM CDT	Tornado Warning	FGF	Cass	30 min
Aug 9, 2:36 PM CDT	Tornado Warning Tornado observed	FGF	Traill	28 min
Aug 9, 2:52 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Traill	53 min
Aug 9, 3:12 PM CDT	Severe Thunderstorm Warning	FGF	Traill	63 min
Aug 9, 3:20 PM CDT	Severe Thunderstorm Warning	FGF	Cass	22 min
Aug 9, 3:35 PM CDT	Tornado Warning	FGF	Cass	18 min
Aug 9, 3:38 PM CDT	Severe Thunderstorm Warning	FGF	Ransom, Sargent	25 min
Aug 9, 3:53 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Traill	48 min
Aug 9, 3:55 PM CDT	Severe Thunderstorm Warning	FGF	Sargent	28 min
Aug 9, 4:24 PM CDT	Special Weather Statement	FGF	Sargent	36 min

Nearby

Tornado Warnings in North Dakota, 2020 Every tornado warning in 2020 Tornadoes in 2020

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.