Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 103, NWS Grand Forks, ND

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

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 22, 2021, 7:40 PM CDT for Grand Forks County, Nelson County, North Dakota. It was in force for 23 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, 7:40 PM CDT (00:40 UTC)
Expired: Aug 22, 2021, 8:03 PM CDT
In force: 23 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Grand Forks County, ND, Nelson County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 55 km from the middle of the area, began a volume at 00:42 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, 0.7 hours before the alert went out and 245 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.

969 
WUUS53 KFGF 230040
SVRFGF
NDC035-063-230145-
/O.NEW.KFGF.SV.W.0103.210823T0040Z-210823T0145Z/

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

The National Weather Service in Grand Forks has issued a

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

* Until 845 PM CDT.

* At 740 PM CDT, a severe thunderstorm was located near Logan Center,
  or 37 miles west of Grand Forks, moving east 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 remain over mainly rural areas of
  west central Grand Forks and east central Nelson Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4780 9795 4789 9803 4797 9777 4783 9767
TIME...MOT...LOC 0040Z 249DEG 28KT 4787 9787 

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

062 
WWUS53 KFGF 230103
SVSFGF

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

NDC035-063-230113-
/O.CAN.KFGF.SV.W.0103.000000T0000Z-210823T0145Z/
Grand Forks ND-Nelson ND-
803 PM CDT Sun Aug 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL GRAND FORKS AND
EAST CENTRAL NELSON COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited 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 4780 9795 4789 9803 4797 9777 4783 9767
TIME...MOT...LOC 0102Z 249DEG 28KT 4794 9762 

$$

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, 7:46 PM CDT	Tornado Warning	FGF	Grand Forks, Nelson	18 min
Aug 22, 7:54 PM CDT	Severe Thunderstorm Warning	FGF	Steele	11 min

Nearby

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.