Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 113, NWS Grand Forks, ND

September 15, 2021Grand Forks County, Walsh County, North Dakota; Marshall County, Polk County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 15, 2021, 10:47 PM CDT for Grand Forks County, Walsh County, North Dakota; Marshall County, Polk County, Minnesota. It was in force for 43 min. 3 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: Sep 15, 2021, 10:47 PM CDT (03:47 UTC)
Expired: Sep 15, 2021, 11:30 PM CDT
In force: 43 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Marshall County, MN, Polk County, MN, Grand Forks County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 65 km from the middle of the area, began a volume at 03:50 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
Sep 15, 11:00 PM CDT	HAIL 1	1 Wsw Manvel, ND	A FEW NICKEL TO QUATER SIZED HAIL IN VERY HEAVY RAIN.
Sep 15, 11:33 PM CDT	TSTM WND GST 59	6 Sw Warren, MN	PEAK WIND MEASURED AT AN NDAWN STATION AT 3 METERS.
Sep 15, 11:33 PM CDT	TSTM WND GST 59	6 Sw Warren, MN	VIA NDAWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 3.8 hours before the alert went out and 295 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: 96 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 2621 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

348 
WUUS53 KFGF 160347
SVRFGF
MNC089-119-NDC035-099-160430-
/O.NEW.KFGF.SV.W.0113.210916T0347Z-210916T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
1047 PM CDT Wed Sep 15 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Southwestern Marshall County in northwestern Minnesota...
  Northwestern Polk County in northwestern Minnesota...
  Northeastern Grand Forks County in northeastern North Dakota...
  Southeastern Walsh County in northeastern North Dakota...

* Until 1130 PM CDT.

* At 1047 PM CDT, a severe thunderstorm was located over Mekinock, or
  18 miles northwest of Grand Forks, moving east at 35 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...
  Manvel around 1105 PM CDT.

Other locations in the path of this severe thunderstorm include
Tabor.

This includes Interstate 29 between mile markers 145 and 166.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4800 9756 4815 9765 4828 9748 4828 9687
      4798 9683
TIME...MOT...LOC 0347Z 266DEG 29KT 4804 9739 

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

$$

Lynch

1 follow-up statement

072 
WWUS53 KFGF 160417
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
1117 PM CDT Wed Sep 15 2021

NDC035-099-160427-
/O.CAN.KFGF.SV.W.0113.000000T0000Z-210916T0430Z/
Grand Forks ND-Walsh ND-
1117 PM CDT Wed Sep 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GRAND FORKS AND
SOUTHEASTERN WALSH COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4798 9683 4799 9703 4815 9713 4828 9711
      4828 9687
TIME...MOT...LOC 0417Z 266DEG 29KT 4806 9702 

$$

MNC089-119-160430-
/O.CON.KFGF.SV.W.0113.000000T0000Z-210916T0430Z/
Marshall MN-Polk MN-
1117 PM CDT Wed Sep 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT
FOR SOUTHWESTERN MARSHALL AND NORTHWESTERN POLK COUNTIES...

At 1117 PM CDT, a severe thunderstorm was located 7 miles east of
Manvel, or 10 miles north of Grand Forks, moving east at 35 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...
  Tabor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4798 9683 4799 9703 4815 9713 4828 9711
      4828 9687
TIME...MOT...LOC 0417Z 266DEG 29KT 4806 9702 

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

$$

Lynch

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 8:52 PM CDT	Special Weather Statement	FGF	Cavalier	38 min
Sep 15, 9:31 PM CDT	Special Weather Statement	FGF	Walsh	59 min
Sep 15, 9:33 PM CDT	Special Weather Statement	FGF	Nelson	57 min
Sep 15, 9:42 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	63 min
Sep 15, 10:38 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	52 min
Sep 15, 11:45 PM CDT	Severe Thunderstorm Warning	FGF	Traill	60 min
Sep 15, 11:25 PM CDT	Severe Thunderstorm Warning	FGF	Marshall, Pennington, Polk	50 min
Sep 15, 11:27 PM CDT	Special Weather Statement	FGF	Marshall	48 min
Sep 16, 12:14 AM CDT	Special Weather Statement	FGF	Pennington	46 min
Sep 16, 12:22 AM CDT	Special Weather Statement	FGF	Polk, Red Lake	38 min
Sep 16, 12:42 AM CDT	Severe Thunderstorm Warning	FGF	Polk, Red Lake	33 min
Sep 16, 1:13 AM CDT	Special Weather Statement	FGF	Red Lake	32 min
Sep 16, 1:23 AM CDT	Special Weather Statement	FGF	Mahnomen	37 min
Sep 16, 1:51 AM CDT	Special Weather Statement	FGF	Beltrami, Clearwater	54 min
Sep 16, 1:59 AM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater, Hubbard, Mahnomen, Polk	49 min
Sep 16, 2:44 AM CDT	Special Weather Statement	FGF	Hubbard	46 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2021 Severe Thunderstorm Warnings in Minnesota, 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.