Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 90, NWS Twin Cities, MN

August 9, 2020Carver County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 9, 2020, 9:30 PM CDT for Carver County, Minnesota. It was in force for 45 min. 8 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
Aug 9, 2020, 9:30 PM CDT (02:30 UTC)
Expired
Aug 9, 2020, 10:15 PM CDT
In force
45 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

County Carver County, MN

The radar

The Minneapolis radar (KMPX), 7 km from the middle of the area, began a volume at 02:31 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

TimeReportWhereRemark
Aug 9, 9:30 PM CDTHAIL 1.753 Wsw Chanhassen, MN.
Aug 9, 9:30 PM CDTHAIL 1.753 Wsw Chanhassen, MN
Aug 9, 9:37 PM CDTHAIL 1.252 Wsw Chanhassen, MNCONTINUOUS HAIL, THE LARGEST 1.25 INCHES.
Aug 9, 9:45 PM CDTHAIL 1.253 Sw Chanhassen, MN.
Aug 9, 9:45 PM CDTHAIL 1.253 Sw Chanhassen, MN
Aug 9, 9:45 PM CDTHAIL 1.751 Sse Victoria, MNTHERE HAS BEEN NUMEROUS REPORTS OF LARGE HAIL, UP TO GOLF BALL SIZE FROM VICTORIA, EASTWARD TO CHANHASSEN.
Aug 9, 9:45 PM CDTHAIL 2.51 S Victoria, MNSOCIAL MEDIA PICTURE OF 2.5 INCH DIAMETER HAIL IN VICTORIA.
Aug 9, 9:57 PM CDTHAIL 22 Wsw Chanhassen, MN2 INCH HAIL AT THE NWS OFFICE.

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.5 hours before the alert went out and 5 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2020-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2342 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2020-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2342 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1184 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
107 m²/s²
0-3 km storm-relative helicity
168 m²/s²
Significant tornado parameter
1.0
Supercell composite
10.5

Open this sounding in Storm Lab

The text

As transmitted.

727 
WUUS53 KMPX 100230
SVRMPX
MNC019-100315-
/O.NEW.KMPX.SV.W.0090.200810T0230Z-200810T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
930 PM CDT Sun Aug 9 2020

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  East central Carver County in east central Minnesota...

* Until 1015 PM CDT.

* At 929 PM CDT, a severe thunderstorm was located near Carver, or 24
  miles southwest of Minneapolis, moving east at 20 mph.

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

  SOURCE...Public.

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

* Locations impacted include...
  Chaska, Chanhassen, Waconia, Victoria, Minnetrista, Carver, St.
  Bonifacius and Shorewood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4481 9379 4490 9375 4489 9352 4481 9352
      4480 9354 4480 9357 4476 9362 4475 9361
      4475 9362
TIME...MOT...LOC 0229Z 288DEG 16KT 4480 9370 

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

JRB
4 follow-up statements
019 
WWUS53 KMPX 100234
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
934 PM CDT Sun Aug 9 2020

MNC019-100315-
/O.CON.KMPX.SV.W.0090.000000T0000Z-200810T0315Z/
Carver MN-
934 PM CDT Sun Aug 9 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR EAST CENTRAL CARVER COUNTY...

At 934 PM CDT, a severe thunderstorm was located over Chaska, or 18
miles southwest of Minneapolis, moving east at 25 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Public.

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...
Chaska, Chanhassen, Victoria, Minnetrista, Carver and Shorewood. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4480 9375 4490 9373 4489 9352 4481 9352
      4480 9354 4480 9357 4476 9362 4475 9361
      4475 9362
TIME...MOT...LOC 0234Z 275DEG 22KT 4485 9361 

HAIL...1.75IN
WIND...60MPH
 
$$

JRB
288 
WWUS53 KMPX 100245
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
945 PM CDT Sun Aug 9 2020

MNC019-100315-
/O.CON.KMPX.SV.W.0090.000000T0000Z-200810T0315Z/
Carver MN-
945 PM CDT Sun Aug 9 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR EAST CENTRAL CARVER COUNTY...

At 944 PM CDT, a severe thunderstorm was located over Chaska, or 18
miles southwest of Minneapolis, moving southeast at 15 mph.

HAZARD...Two inch hail and 60 mph wind gusts.

SOURCE...Public.

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...
Chaska, Chanhassen, Victoria, Minnetrista, Carver and Shorewood. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4478 9371 4490 9367 4489 9352 4481 9352
      4480 9354 4480 9357 4476 9362 4475 9361
      4475 9362
TIME...MOT...LOC 0244Z 298DEG 14KT 4481 9358 

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

JRB
516 
WWUS53 KMPX 100259
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
959 PM CDT Sun Aug 9 2020

MNC019-100315-
/O.CON.KMPX.SV.W.0090.000000T0000Z-200810T0315Z/
Carver MN-
959 PM CDT Sun Aug 9 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR EAST CENTRAL CARVER COUNTY...

At 958 PM CDT, a severe thunderstorm was located near Chaska, or 17
miles southwest of Minneapolis, moving east at 15 mph.

HAZARD...Two inch hail and 60 mph wind gusts.

SOURCE...Public.

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...
Chaska, Chanhassen, Victoria and Carver. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4479 9369 4488 9365 4488 9352 4481 9352
      4480 9354 4480 9357 4476 9362 4475 9361
      4475 9362
TIME...MOT...LOC 0258Z 287DEG 14KT 4480 9354 

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

JRB
748 
WWUS53 KMPX 100306
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1006 PM CDT Sun Aug 9 2020

MNC019-100315-
/O.CON.KMPX.SV.W.0090.000000T0000Z-200810T0315Z/
Carver MN-
1006 PM CDT Sun Aug 9 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR EAST CENTRAL CARVER COUNTY...

At 1006 PM CDT, a severe thunderstorm was located over Shakopee, or
16 miles southwest of Minneapolis, moving east at 15 mph.

HAZARD...Two inch hail and 60 mph wind gusts.

SOURCE...Public.

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...
Chaska and Chanhassen. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4481 9363 4488 9360 4488 9352 4481 9352
      4480 9354 4480 9357 4478 9359
TIME...MOT...LOC 0306Z 287DEG 14KT 4480 9350 

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

JRB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 7:52 PM CDTSpecial Weather StatementMPXHennepin23 min
Aug 9, 8:13 PM CDTSpecial Weather StatementMPXHennepin47 min
Aug 9, 8:47 PM CDTSpecial Weather StatementMPXScott88 min
Aug 9, 9:00 PM CDTSpecial Weather StatementMPXScott30 min
Aug 9, 9:21 PM CDTSpecial Weather StatementMPXCarver54 min
Aug 9, 9:39 PM CDTSevere Thunderstorm WarningMPXHennepin, Scott51 min
Aug 9, 10:14 PM CDTSpecial Weather StatementMPXHennepin46 min
Aug 9, 10:27 PM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin, Sherburne, Wright48 min
Aug 9, 10:27 PM CDTSevere Thunderstorm WarningMPXDakota, Hennepin, Scott27 min
Aug 9, 10:48 PM CDTSevere Thunderstorm WarningMPXWright57 min
Aug 9, 11:16 PM CDTSevere Thunderstorm WarningMPXHennepin44 min
Aug 9, 11:40 PM CDTSevere Thunderstorm WarningMPXWright50 min
Aug 9, 11:56 PM CDTSevere Thunderstorm WarningMPXHennepin49 min
Aug 10, 12:28 AM CDTSevere Thunderstorm WarningMPXWright32 min
Aug 10, 12:41 AM CDTSevere Thunderstorm WarningMPXHennepin49 min
Aug 10, 12:42 AM CDTSpecial Weather StatementMPXHennepin63 min
Aug 10, 12:54 AM CDTSevere Thunderstorm WarningMPXCarver, Hennepin51 min
Aug 10, 1:21 AM CDTSevere Thunderstorm WarningMPXDakota, Hennepin, Scott39 min
Aug 10, 1:29 AM CDTSpecial Weather StatementMPXHennepin61 min
Aug 10, 1:48 AM CDTFlash Flood WarningMPXCarver, Hennepin, Scott4 hr
Aug 10, 1:57 AM CDTSevere Thunderstorm WarningMPXDakota, Hennepin, Washington48 min
Aug 10, 2:04 AM CDTSevere Thunderstorm WarningMPXMeeker, Wright26 min
Aug 10, 2:08 AM CDTSevere Thunderstorm WarningMPXRice, Scott37 min
Aug 10, 2:20 AM CDTSevere Thunderstorm WarningMPXDakota, Scott40 min
Aug 10, 2:31 AM CDTSevere Thunderstorm WarningMPXWright44 min
Aug 10, 2:41 AM CDTSevere Thunderstorm WarningMPXDakota, Rice, Scott49 min
Aug 10, 2:43 AM CDTSevere Thunderstorm WarningMPXCarver, Scott32 min
Aug 10, 3:06 AM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin54 min
Aug 10, 3:15 AM CDTSevere Thunderstorm WarningMPXKanabec, Mille Lacs45 min
Aug 10, 3:29 AM CDTSevere Thunderstorm WarningMPXDakota, Goodhue, Rice46 min
Aug 10, 3:34 AM CDTSpecial Weather StatementMPXSherburne56 min
Aug 10, 3:46 AM CDTSevere Thunderstorm WarningMPXRice44 min
Aug 10, 3:58 AM CDTSpecial Weather StatementMPXDakota32 min
Aug 10, 4:10 AM CDTSevere Thunderstorm WarningMPXGoodhue, Rice50 min
Aug 10, 4:16 AM CDTSevere Thunderstorm WarningMPXSteele, Waseca59 min
Aug 10, 5:08 AM CDTSevere Thunderstorm WarningMPXFreeborn, Steele, Waseca22 min
Aug 10, 5:27 AM CDTSevere Thunderstorm WarningMPXGoodhue, Rice17 min
Aug 10, 7:44 AM CDTSpecial Weather StatementMPXBlue Earth31 min
Aug 10, 8:03 AM CDTSpecial Weather StatementMPXWaseca27 min
Aug 10, 8:10 AM CDTSevere Thunderstorm WarningMPXWaseca35 min
Aug 10, 8:36 AM CDTSevere Thunderstorm WarningMPXFreeborn, Steele28 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2020Every 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.