Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 134, NWS Twin Cities, MN

October 9, 2021Stevens County, Swift County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Oct 9, 2021, 7:56 PM CDT for Stevens County, Swift County, Minnesota. It was in force for 49 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: Oct 9, 2021, 7:56 PM CDT (00:56 UTC)
Expired: Oct 9, 2021, 8:45 PM CDT
In force: 49 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Stevens County, MN, Swift County, MN

The radar

The Aberdeen radar (KABR), 184 km from the middle of the area, began a volume at 00:56 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
Oct 9, 6:34 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.9 hours before the alert went out and 192 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: 1552 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

352 
WUUS53 KMPX 100056
SVRMPX
MNC149-151-100145-
/O.NEW.KMPX.SV.W.0134.211010T0056Z-211010T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
756 PM CDT Sat Oct 9 2021

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Stevens County in west central Minnesota...
  Western Swift County in west central Minnesota...

* Until 845 PM CDT.

* At 756 PM CDT, a severe thunderstorm was located over Elbow Lake,
  or 18 miles south of Fergus Falls, moving northeast at 50 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
  Stevens and western Swift Counties, including the following
  locations... Fish Lake, Appleton Airport, Alberta, Holloway and
  Morris Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in the Twin Cities.

&&

LAT...LON 4575 9625 4576 9576 4541 9575 4541 9573
      4515 9600 4516 9607 4518 9610 4524 9610
      4524 9612 4541 9612 4542 9625 4545 9624
TIME...MOT...LOC 0056Z 210DEG 44KT 4602 9601 

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

$$

CTG

1 follow-up statement

630 
WWUS53 KMPX 100137
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
837 PM CDT Sat Oct 9 2021

MNC149-151-100147-
/O.EXP.KMPX.SV.W.0134.000000T0000Z-211010T0145Z/
Stevens MN-Swift MN-
837 PM CDT Sat Oct 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR STEVENS AND WESTERN SWIFT
COUNTIES WILL EXPIRE AT 845 PM CDT...
                
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 will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
west central Minnesota.

LAT...LON 4575 9625 4576 9576 4541 9575 4541 9573
      4515 9600 4516 9607 4518 9610 4524 9610
      4524 9612 4541 9612 4542 9625 4545 9624
TIME...MOT...LOC 0137Z 210DEG 44KT 4645 9565 

$$

CTG

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 9, 7:13 PM CDT	Special Weather Statement	MPX	Lac qui Parle, Yellow Medicine	62 min
Oct 9, 7:19 PM CDT	Severe Thunderstorm Warning	MPX	Stevens, Swift	41 min
Oct 9, 7:35 PM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle	25 min
Oct 9, 7:58 PM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle	47 min
Oct 9, 8:15 PM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope	45 min
Oct 9, 10:59 PM CDT	Special Weather Statement	MPX	Chippewa, Lac qui Parle, Pope, Swift, Todd, Yellow Medicine	3 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.