Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 175, NWS Twin Cities, MN

September 6, 2020Carver County, Hennepin County, Scott County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 6, 2020, 12:11 AM CDT for Carver County, Hennepin County, Scott County, Minnesota. It was in force for 34 min. 6 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 6, 2020, 12:11 AM CDT (05:11 UTC)
Expired: Sep 6, 2020, 12:45 AM CDT
In force: 34 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

Counties Carver County, MN, Hennepin County, MN, Scott County, MN

The radar

The Minneapolis radar (KMPX), 14 km from the middle of the area, began a volume at 05:13 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
Sep 6, 12:29 AM CDT	HAIL 1.75	2 W Excelsior, MN
Sep 6, 12:30 AM CDT	HAIL 1	Excelsior, MN
Sep 6, 12:31 AM CDT	HAIL 1	1 N Chanhassen, MN
Sep 6, 12:34 AM CDT	HAIL 1	3 Ssw Minnetonka, MN
Sep 6, 12:35 AM CDT	HAIL 1.25	Eden Prairie, MN
Sep 6, 12:42 AM CDT	HAIL 1	1 Nnw Eden Prairie, MN

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, 5.2 hours before the alert went out and 12 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.

620 
WUUS53 KMPX 060511
SVRMPX
MNC019-053-139-060545-
/O.NEW.KMPX.SV.W.0175.200906T0511Z-200906T0545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
1211 AM CDT Sun Sep 6 2020

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Southwestern Hennepin County in east central Minnesota...
  North central Scott County in east central Minnesota...
  Northern Carver County in east central Minnesota...

* Until 1245 AM CDT.

* At 1210 AM CDT, a severe thunderstorm was located over Mayer, or 19
  miles south of Buffalo, moving east at 45 mph.

  HAZARD...Ping pong ball size hail.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Waconia around 1215 AM CDT.
  Mound and St. Bonifacius around 1220 AM CDT.
  Chaska, Chanhassen and Victoria around 1225 AM CDT.
  Carver and Excelsior around 1230 AM CDT.
  Eden Prairie around 1235 AM CDT.
  Shakopee and Prior Lake around 1240 AM CDT.

Other locations impacted by this severe thunderstorm include Lake
Waconia, Flying Cloud Airport, Greenwood, Deephaven and Shorewood.

This includes Mystic Lake Casino.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4484 9397 4498 9392 4498 9376 4492 9337
      4471 9347
TIME...MOT...LOC 0510Z 287DEG 39KT 4490 9385 

HAIL...1.50IN
WIND...<50MPH
 
$$

Borghoff

3 follow-up statements

832 
WWUS53 KMPX 060519
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1219 AM CDT Sun Sep 6 2020

MNC019-053-139-060545-
/O.CON.KMPX.SV.W.0175.000000T0000Z-200906T0545Z/
Hennepin MN-Scott MN-Carver MN-
1219 AM CDT Sun Sep 6 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR SOUTHWESTERN HENNEPIN...NORTH CENTRAL SCOTT AND NORTHEASTERN
CARVER COUNTIES...

At 1219 AM CDT, a severe thunderstorm was located over Victoria, or
22 miles west of Minneapolis, moving east at 45 mph.

HAZARD...Golf ball size hail.

SOURCE...Radar indicated.

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

This severe storm will be near...
  Chaska and Chanhassen around 1225 AM CDT.
  Carver and Excelsior around 1230 AM CDT.
  Eden Prairie around 1235 AM CDT.
  Shakopee and Prior Lake around 1240 AM CDT.

Other locations impacted by this severe thunderstorm include Lake
Waconia, Flying Cloud Airport, Greenwood, Shorewood and Deephaven.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4484 9380 4494 9376 4492 9337 4471 9347
TIME...MOT...LOC 0519Z 287DEG 39KT 4487 9371 

HAIL...1.75IN
WIND...<50MPH
 
$$

Borghoff

511 
WWUS53 KMPX 060523
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1223 AM CDT Sun Sep 6 2020

MNC019-053-139-060545-
/O.CON.KMPX.SV.W.0175.000000T0000Z-200906T0545Z/
Hennepin MN-Scott MN-Carver MN-
1223 AM CDT Sun Sep 6 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR SOUTHWESTERN HENNEPIN...NORTH CENTRAL SCOTT AND EAST CENTRAL
CARVER COUNTIES...

At 1223 AM CDT, a severe thunderstorm was located over Victoria, or
19 miles west of Minneapolis, moving east at 50 mph.

HAZARD...Two inch hail.

SOURCE...Radar indicated.

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

This severe storm will be near...
  Eden Prairie and Shakopee around 1235 AM CDT.
  Edina and Prior Lake around 1240 AM CDT.

Other locations impacted by this severe thunderstorm include Flying
Cloud Airport, Greenwood, Deephaven and Shorewood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4484 9373 4494 9369 4492 9337 4473 9346
TIME...MOT...LOC 0523Z 282DEG 42KT 4487 9365 

HAIL...2.00IN
WIND...<50MPH
 
$$

Borghoff

803 
WWUS53 KMPX 060539
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1239 AM CDT Sun Sep 6 2020

MNC019-053-139-060548-
/O.EXP.KMPX.SV.W.0175.000000T0000Z-200906T0545Z/
Hennepin MN-Scott MN-Carver MN-
1239 AM CDT Sun Sep 6 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HENNEPIN...NORTH
CENTRAL SCOTT AND EAST CENTRAL CARVER COUNTIES WILL EXPIRE AT 1245 AM
CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

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

Remember, a Severe Thunderstorm Warning still remains in effect for
southern Hennepin County until 100 AM CDT.

LAT...LON 4484 9373 4494 9369 4492 9337 4473 9346
TIME...MOT...LOC 0538Z 287DEG 39KT 4483 9346 

$$

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, 12:12 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, 1:17 AM CDT	Severe Thunderstorm Warning	MPX	Martin	38 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.