Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 182, NWS Twin Cities, MN

September 6, 2020Martin County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 6, 2020, 1:17 AM CDT for Martin County, Minnesota. It was in force for 38 min. 1 report 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 6, 2020, 1:17 AM CDT (06:17 UTC)
Expired: Sep 6, 2020, 1:55 AM CDT
In force: 38 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 2.0 in
Wind: 60.0 mph

County Martin County, MN

The radar

The Minneapolis radar (KMPX), 163 km from the middle of the area, began a volume at 06:20 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 6, 1:35 AM CDT	TSTM WND DMG	Ceylon, MN	TREE AND LARGE BRANCHES DOWN.

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
Sep 5, 9:34 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 6.3 hours before the alert went out and 162 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: 2083 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

560 
WUUS53 KMPX 060617
SVRMPX
MNC091-060715-
/O.NEW.KMPX.SV.W.0182.200906T0617Z-200906T0715Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
117 AM CDT Sun Sep 6 2020

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Martin County in south central Minnesota...

* Until 215 AM CDT.

* At 117 AM CDT, severe thunderstorms were located along a line
  extending from near Jackson In Jackson County to Okamanpedan Lake,
  moving southeast at 40 mph.

  HAZARD...Two inch 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.

* Locations impacted include...
  Fairmont, Sherburn, Welcome, Ceylon, Iowa Lake, Okamanpedan Lake,
  Granada, East Chain, Dunnell, Fairmont Airport, Imogene and
  Wilbert.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These are dangerous storms. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to shelter inside a strong building,  and stay away from
windows.

&&

LAT...LON 4350 9485 4376 9485 4368 9425 4350 9425
TIME...MOT...LOC 0617Z 293DEG 34KT 4366 9495 4350 9461 

HAIL...2.00IN
WIND...60MPH
 
$$

Borghoff

3 follow-up statements

053 
WWUS53 KMPX 060634
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
134 AM CDT Sun Sep 6 2020

MNC091-060715-
/O.CON.KMPX.SV.W.0182.000000T0000Z-200906T0715Z/
Martin MN-
134 AM CDT Sun Sep 6 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 AM CDT
FOR SOUTHERN MARTIN COUNTY...

At 134 AM CDT, a severe thunderstorm was located near Sherburn, or 12
miles west of Fairmont, moving east at 45 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe storm will be near...
  Ceylon around 140 AM CDT.
  Okamanpedan Lake around 145 AM CDT.
  Fairmont around 150 AM CDT.
  Iowa Lake around 155 AM CDT.

Other locations impacted by this severe thunderstorm include Fairmont
Airport, East Chain, Imogene, Dunnell, Wilbert and Granada.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4350 9485 4371 9485 4368 9425 4350 9425
TIME...MOT...LOC 0634Z 289DEG 38KT 4360 9471 

HAIL...1.25IN
WIND...60MPH
 
$$

Borghoff

062 
WWUS53 KMPX 060645
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
145 AM CDT Sun Sep 6 2020

MNC091-060715-
/O.CON.KMPX.SV.W.0182.000000T0000Z-200906T0715Z/
Martin MN-
145 AM CDT Sun Sep 6 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 AM CDT
FOR SOUTHEASTERN MARTIN COUNTY...

At 145 AM CDT, a severe thunderstorm was located over Iowa Lake, or 7
miles south of Fairmont, moving east at 60 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
southeastern Martin County, including the following locations... East
Chain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4350 9458 4363 9454 4358 9425 4350 9425
TIME...MOT...LOC 0645Z 289DEG 53KT 4352 9445 

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

Borghoff

754 
WWUS53 KMPX 060655
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
155 AM CDT Sun Sep 6 2020

MNC091-060705-
/O.CAN.KMPX.SV.W.0182.000000T0000Z-200906T0715Z/
Martin MN-
155 AM CDT Sun Sep 6 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MARTIN COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
south central Minnesota.

LAT...LON 4350 9458 4363 9454 4358 9425 4350 9425
TIME...MOT...LOC 0652Z 293DEG 34KT 4348 9433 

$$

Borghoff

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 10:57 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Sibley	48 min
Sep 5, 11:09 PM CDT	Severe Thunderstorm Warning	MPX	Renville	51 min
Sep 5, 11:17 PM CDT	Severe Thunderstorm Warning	MPX	Redwood, Renville, Yellow Medicine	43 min
Sep 5, 11:31 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice, Steele, Waseca	44 min
Sep 5, 11:34 PM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Meeker	56 min
Sep 5, 11:36 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle	54 min
Sep 5, 11:58 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Sibley	47 min
Sep 6, 12:09 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Renville, Yellow Medicine	66 min
Sep 6, 12:11 AM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin, Scott	34 min
Sep 6, 12:12 AM CDT	Severe Thunderstorm Warning	MPX	Steele	33 min
Sep 6, 12:15 AM CDT	Severe Thunderstorm Warning	MPX	Wright	15 min
Sep 6, 12:38 AM CDT	Severe Thunderstorm Warning	MPX	Hennepin	22 min
Sep 6, 12:43 AM CDT	Severe Thunderstorm Warning	MPX	Brown, Nicollet, Redwood, Renville, Sibley	62 min
Sep 6, 12:50 AM CDT	Severe Thunderstorm Warning	MPX	Redwood, Renville	42 min
Sep 6, 1:09 AM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Le Sueur, Nicollet	53 min
Sep 6, 1:30 AM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Martin, Watonwan	45 min
Sep 6, 2:01 AM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault, Martin, Watonwan	44 min
Sep 6, 4:05 AM CDT	Special Weather Statement	MPX	Dakota	25 min
Sep 6, 4:26 AM CDT	Special Weather Statement	MPX	Goodhue	19 min
Sep 6, 4:30 AM CDT	Severe Thunderstorm Warning	MPX	Dakota	30 min
Sep 6, 4:48 AM CDT	Severe Thunderstorm Warning	MPX	Goodhue	42 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2020 Every severe thunderstorm warning in 2020

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.