Alert archive / North Dakota / Tornado Warnings in 2021

Tornado Warning 12, NWS Grand Forks, ND

August 22, 2021Griggs County, Steele County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Aug 22, 2021, 7:31 PM CDT for Griggs County, Steele County, North Dakota. It was in force for 23 min. 1 report 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 22, 2021, 7:31 PM CDT (00:31 UTC)
Expired: Aug 22, 2021, 7:54 PM CDT
In force: 23 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

Counties Griggs County, ND, Steele County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 63 km from the middle of the area, began a volume at 00:35 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 22, 7:35 PM CDT	HAIL 1	2 Ne Hannaford, ND

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 22, 3:36 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.5 hours before the alert went out and 206 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1969 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

873 
WFUS53 KFGF 230031
TORFGF
NDC039-091-230115-
/O.NEW.KFGF.TO.W.0012.210823T0031Z-210823T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Grand Forks ND
731 PM CDT Sun Aug 22 2021

The National Weather Service in Grand Forks has issued a

* Tornado Warning for...
  Southeastern Griggs County in southeastern North Dakota...
  West central Steele County in southeastern North Dakota...

* Until 815 PM CDT.
    
* At 731 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Hannaford, or 29 miles north of Valley City,
  moving east at 30 mph.

  HAZARD...Tornado and half dollar size 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 tornadic thunderstorm will remain over mainly rural areas of
  southeastern Griggs and west central Steele Counties.

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 4737 9829 4749 9796 4734 9788 4729 9824
TIME...MOT...LOC 0031Z 249DEG 28KT 4733 9817 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.25 IN

$$

DJR

2 follow-up statements

217 
WWUS53 KFGF 230044
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
744 PM CDT Sun Aug 22 2021

NDC039-091-230115-
/O.CON.KFGF.TO.W.0012.000000T0000Z-210823T0115Z/
Griggs ND-Steele ND-
744 PM CDT Sun Aug 22 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR
SOUTHEASTERN GRIGGS AND WEST CENTRAL STEELE COUNTIES...
    
At 744 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Cooperstown, or 32 miles north of Valley City,
moving northeast at 30 mph.

HAZARD...Tornado and half dollar size 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 tornadic thunderstorm will remain over mainly rural areas of
southeastern Griggs and west central Steele Counties.

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 4736 9789 4733 9812 4742 9816 4749 9796
TIME...MOT...LOC 0044Z 239DEG 27KT 4739 9806 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.25 IN

$$

DJR

018 
WWUS53 KFGF 230054
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
754 PM CDT Sun Aug 22 2021

NDC039-091-230104-
/O.CAN.KFGF.TO.W.0012.000000T0000Z-210823T0115Z/
Griggs ND-Steele ND-
754 PM CDT Sun Aug 22 2021

...THE TORNADO WARNING FOR SOUTHEASTERN GRIGGS AND WEST CENTRAL
STEELE 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 900 PM CDT for
southeastern North Dakota.

LAT...LON 4736 9789 4733 9812 4742 9816 4749 9796
TIME...MOT...LOC 0052Z 249DEG 28KT 4742 9795 

$$

DJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 7:40 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Nelson	23 min
Aug 22, 7:46 PM CDT	Tornado Warning	FGF	Grand Forks, Nelson	18 min
Aug 22, 7:54 PM CDT	Severe Thunderstorm Warning	FGF	Steele	11 min

Nearby

Tornado Warnings in North Dakota, 2021 Every tornado warning in 2021 Tornadoes in 2021

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.