Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 60, NWS Grand Forks, ND

July 24, 2021Grant County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 24, 2021, 12:58 AM CDT for Grant County, Minnesota. It was in force for 47 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: Jul 24, 2021, 12:58 AM CDT (05:58 UTC)
Expired: Jul 24, 2021, 1:45 AM CDT
In force: 47 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Grant County, MN

The radar

The Aberdeen radar (KABR), 197 km from the middle of the area, began a volume at 06:00 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
Jul 24, 1:15 AM CDT	TSTM WND GST 58	8 Sw Elbow Lake, MN	MEASURED BY PERSONAL WEATHER STATION.
Jul 24, 1:15 AM CDT	TSTM WND GST 60	10 W Elbow Lake, MN	MEASURED ON PERSONAL WEATHER STATION IN NORTH OTTAWA TOWNSHIP.
Jul 24, 1:15 AM CDT	TSTM WND GST 60	10 W Elbow Lake, MN	PEAK WIND MEASURED AT A PERSONAL WEATHER STATION IN NORTH OTTAWA TOWNSHIP.

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
Jul 23, 11:22 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 6.0 hours before the alert went out and 221 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: 2540 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 1098 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.4

Open this sounding in Storm Lab

The text

As transmitted.

757 
WUUS53 KFGF 240558
SVRFGF
MNC051-240645-
/O.NEW.KFGF.SV.W.0060.210724T0558Z-210724T0645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
1258 AM CDT Sat Jul 24 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Grant County in west central Minnesota...

* Until 145 AM CDT.

* At 1258 AM CDT, a severe thunderstorm was located over
  Charlesville, or 24 miles south of Fergus Falls, moving east at 45
  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...
  Norcross around 100 AM CDT.
  Wendell around 105 AM CDT.
  Elbow Lake around 115 AM CDT.

Other locations in the path of this severe thunderstorm include
Barrett, Erdahl and Hoffman.

This includes Interstate 94 in Minnesota between mile markers 74 and
80.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4602 9626 4610 9577 4593 9577 4593 9576
      4576 9576 4576 9625
TIME...MOT...LOC 0558Z 270DEG 40KT 4595 9623 

HAIL...1.00IN
WIND...60MPH
 
$$

Riddle

2 follow-up statements

145 
WWUS53 KFGF 240625
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
125 AM CDT Sat Jul 24 2021

MNC051-240645-
/O.CON.KFGF.SV.W.0060.000000T0000Z-210724T0645Z/
Grant MN-
125 AM CDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR GRANT COUNTY...

At 124 AM CDT, a severe thunderstorm was located over Erdahl, or 26
miles southeast of Fergus Falls, moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated. At 115 AM CDT..60 mph wind was reported 10 
         miles west of Elbow Lake. 

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
  Hoffman, Elbow Lake, Ashby

This includes Interstate 94 in Minnesota between mile markers 74 and
80.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4602 9626 4610 9577 4593 9577 4593 9576
      4576 9576 4576 9625
TIME...MOT...LOC 0624Z 270DEG 40KT 4595 9581 

HAIL...<.75IN
WIND...60MPH
 
$$

Riddle

619 
WWUS53 KFGF 240649
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
149 AM CDT Sat Jul 24 2021

MNC051-240659-
/O.EXP.KFGF.SV.W.0060.000000T0000Z-210724T0645Z/
Grant MN-
149 AM CDT Sat Jul 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR GRANT COUNTY HAS EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
west central Minnesota.

LAT...LON 4602 9626 4610 9577 4593 9577 4593 9576
      4576 9576 4576 9625
TIME...MOT...LOC 0649Z 270DEG 40KT 4595 9541 

$$

Riddle

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 11:50 PM CDT	Special Weather Statement	FGF	Wilkin	55 min
Jul 24, 12:41 AM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail, Wilkin	49 min
Jul 24, 1:05 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Otter Tail	40 min
Jul 24, 1:34 AM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail	41 min
Jul 24, 1:51 AM CDT	Severe Thunderstorm Warning	FGF	Otter Tail, Wadena	39 min
Jul 24, 2:32 AM CDT	Special Weather Statement	FGF	Hubbard	58 min

Nearby

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.