Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 102, NWS Grand Forks, ND

August 22, 2021Griggs County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 22, 2021, 6:48 PM CDT for Griggs County, North Dakota. It was in force for 57 min. 5 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 22, 2021, 6:48 PM CDT (23:48 UTC)
Expired: Aug 22, 2021, 7:45 PM CDT
In force: 57 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Griggs County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 74 km from the middle of the area, began a volume at 23:48 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.

What was reported inside it

Time	Report	Where	Remark
Aug 22, 7:00 PM CDT	HAIL 1.25	7 Ssw Revere, ND	4 WAVES, EACH WITH LARGER HAIL. STARTED AS PEAS AND TURNED TO ABOUT HALF DOLLARS. DAMAGED GARDEN.
Aug 22, 7:00 PM CDT	HAIL 1.25	7 Ssw Revere, ND	FOUR WAVES OF HAIL, EACH WITH LARGER HAIL STONES. STARTED AS PPEAS AND TURNED TO ABOUT HALF DOLLAR SIZED. DAMAGED GARDEN.
Aug 22, 7:15 PM CDT	HAIL 1.75	2 N Sutton, ND	GOLF BALL HAIL REPORTED NORTH OF TOWN, WITH PEA TO QUARTER SIZED HAIL SOUTH OF TOWN.
Aug 22, 7:15 PM CDT	HAIL 1.75	2 N Sutton, ND	GOLF BALL SIZE HAIL REPORTED NORTH OF TOWN, WITH PEA SIZE MIXED WITH NICKEL AND QUARTER SOUTH OF TOWN.
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 12:00Z, 11.8 hours before the alert went out and 195 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: 1536 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 311 m²/s²
0-3 km storm-relative helicity: 445 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

195 
WUUS53 KFGF 222348
SVRFGF
NDC039-230045-
/O.NEW.KFGF.SV.W.0102.210822T2348Z-210823T0045Z/

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

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Central Griggs County in southeastern North Dakota...

* Until 745 PM CDT.

* At 648 PM CDT, a severe thunderstorm was located near Sutton, or 36
  miles northwest 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...
  Sutton around 655 PM CDT.
  Revere around 700 PM CDT.

Other locations in the path of this severe thunderstorm include
Hannaford and Cooperstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4764 9799 4737 9799 4724 9843 4724 9847
      4732 9847 4733 9850 4741 9850
TIME...MOT...LOC 2348Z 240DEG 28KT 4734 9848 

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

$$

DJR

2 follow-up statements

903 
WWUS53 KFGF 230000
SVSFGF

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

NDC039-230045-
/O.CON.KFGF.SV.W.0102.000000T0000Z-210823T0045Z/
Griggs ND-
700 PM CDT Sun Aug 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR CENTRAL GRIGGS COUNTY...

At 700 PM CDT, a severe thunderstorm was located over Revere, or 35
miles northwest of Valley City, moving northeast at 25 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

This severe storm will be near...
  Revere around 705 PM CDT.

Other locations in the path of this severe thunderstorm include
Hannaford and Cooperstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4764 9799 4737 9799 4724 9843 4724 9847
      4732 9847 4733 9850 4741 9850
TIME...MOT...LOC 0000Z 245DEG 23KT 4736 9839 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DJR

742 
WWUS53 KFGF 230021
SVSFGF

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

NDC039-230045-
/O.CON.KFGF.SV.W.0102.000000T0000Z-210823T0045Z/
Griggs ND-
721 PM CDT Sun Aug 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR EASTERN GRIGGS COUNTY...

At 721 PM CDT, severe thunderstorms were located along a line
extending from near Jessie to Hannaford, 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.

Locations impacted include...
  Cooperstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4764 9799 4737 9799 4728 9831 4749 9832
TIME...MOT...LOC 0021Z 246DEG 27KT 4750 9818 4733 9820 

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

$$

DJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 10:01 AM CDT	Wind Advisory	FGF	Barnes, Benson, Cass, Cavalier, Eddy, Grand Forks and 11 more	10 hr
Aug 22, 4:19 PM CDT	Severe Thunderstorm Warning	FGF	Benson	41 min
Aug 22, 4:25 PM CDT	Tornado Warning	FGF	Benson	35 min
Aug 22, 5:58 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	Eddy	47 min
Aug 22, 6:37 PM CDT	Severe Thunderstorm Warning	FGF	Eddy, Nelson	40 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.