Alert archive / North Dakota / Tornado Warnings in 2021

Tornado Warning 13, NWS Grand Forks, ND

August 22, 2021Grand Forks County, Nelson County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Aug 22, 2021, 7:46 PM CDT for Grand Forks County, Nelson County, North Dakota. It was in force for 18 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 22, 2021, 7:46 PM CDT (00:46 UTC)
Expired: Aug 22, 2021, 8:04 PM CDT
In force: 18 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

Counties Grand Forks County, ND, Nelson County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 51 km from the middle of the area, began a volume at 00:48 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.

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, 0.8 hours before the alert went out and 253 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.

861 
WFUS53 KFGF 230046
TORFGF
NDC035-063-230130-
/O.NEW.KFGF.TO.W.0013.210823T0046Z-210823T0130Z/

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

The National Weather Service in Grand Forks has issued a

* Tornado Warning for...
  West central Grand Forks County in northeastern North Dakota...
  East central Nelson County in northeastern North Dakota...

* Until 830 PM CDT.
    
* At 746 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Logan Center, or 35 miles west of Grand Forks,
  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 dangerous storm will be near...
  Larimore around 805 PM CDT.

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 4781 9789 4788 9798 4801 9759 4788 9751
TIME...MOT...LOC 0046Z 239DEG 27KT 4787 9783 

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

$$

DJR

2 follow-up statements

862 
WWUS53 KFGF 230058
SVSFGF

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

NDC063-230108-
/O.CAN.KFGF.TO.W.0013.000000T0000Z-210823T0130Z/
Nelson ND-
758 PM CDT Sun Aug 22 2021

...THE TORNADO WARNING FOR EAST CENTRAL NELSON COUNTY 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 900 PM CDT for
northeastern North Dakota.

LAT...LON 4795 9777 4801 9759 4797 9756 4790 9774
TIME...MOT...LOC 0058Z 225DEG 25KT 4796 9771 

$$

NDC035-230130-
/O.CON.KFGF.TO.W.0013.000000T0000Z-210823T0130Z/
Grand Forks ND-
758 PM CDT Sun Aug 22 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR WEST
CENTRAL GRAND FORKS COUNTY...
    
At 758 PM CDT, a severe thunderstorm capable of producing a tornado
was located near McCanna, or 30 miles west of Grand Forks, moving
northeast at 30 mph.

HAZARD...Tornado.

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
west central Grand Forks County.

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 4795 9777 4801 9759 4797 9756 4790 9774
TIME...MOT...LOC 0058Z 225DEG 25KT 4796 9771 

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

$$

DJR

085 
WWUS53 KFGF 230104
SVSFGF

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

NDC035-230114-
/O.CAN.KFGF.TO.W.0013.000000T0000Z-210823T0130Z/
Grand Forks ND-
804 PM CDT Sun Aug 22 2021

...THE TORNADO WARNING FOR WEST CENTRAL GRAND FORKS COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
northeastern North Dakota.

LAT...LON 4795 9777 4801 9759 4797 9756 4790 9774
TIME...MOT...LOC 0102Z 239DEG 27KT 4798 9765 

$$

DJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 7:31 PM CDT	Tornado Warning	FGF	Griggs, Steele	23 min
Aug 22, 7:40 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Nelson	23 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.