Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 104, NWS Grand Forks, ND

August 22, 2021Steele County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 22, 2021, 7:54 PM CDT for Steele County, North Dakota. It was in force for 11 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, 7:54 PM CDT (00:54 UTC)
Expired: Aug 22, 2021, 8:05 PM CDT
In force: 11 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

County Steele County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 44 km from the middle of the area, began a volume at 00:54 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, 0.9 hours before the alert went out and 225 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.

963 
WUUS53 KFGF 230054
SVRFGF
NDC091-230200-
/O.NEW.KFGF.SV.W.0104.210823T0054Z-210823T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
754 PM CDT Sun Aug 22 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Northwestern Steele County in southeastern North Dakota...

* Until 900 PM CDT.

* At 754 PM CDT, a severe thunderstorm was located near Finley, or 36
  miles north of Valley City, moving northeast at 30 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Finley around 805 PM CDT.
  Sherbrooke around 810 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4741 9798 4748 9798 4759 9771 4744 9766
      4738 9798 4740 9799
TIME...MOT...LOC 0054Z 239DEG 27KT 4744 9791 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DJR

1 follow-up statement

872 
WWUS53 KFGF 230105
SVSFGF

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

NDC091-230114-
/O.CAN.KFGF.SV.W.0104.000000T0000Z-210823T0200Z/
Steele ND-
805 PM CDT Sun Aug 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN STEELE COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

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

LAT...LON 4741 9798 4748 9798 4759 9771 4744 9766
      4738 9798 4740 9799
TIME...MOT...LOC 0104Z 239DEG 27KT 4748 9781 

$$

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, 7:46 PM CDT	Tornado Warning	FGF	Grand Forks, Nelson	18 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2021 Every severe thunderstorm warning 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.