Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 91, NWS Twin Cities, MN

August 9, 2020Hennepin County, Scott County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 9, 2020, 9:39 PM CDT for Hennepin County, Scott County, Minnesota. It was in force for 51 min. 9 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, 9:39 PM CDT (02:39 UTC)
Expired
Aug 9, 2020, 10:30 PM CDT
In force
51 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.75 in
Wind
50.0 mph

Counties Hennepin County, MN, Scott County, MN

The radar

The Minneapolis radar (KMPX), 10 km from the middle of the area, began a volume at 02:43 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, 9:55 PM CDTHAIL 13 Se Chanhassen, MNSOCIAL MEDIA PICTURE.
Aug 9, 10:03 PM CDTHAIL 21 Ene Chanhassen, MNHAIL STONES BETWEEN 1.75 TO 2.25 INCHES IN DIAMETER. TIME ESTIMATED FROM RADAR.
Aug 9, 10:08 PM CDTHAIL 11 Wnw Eden Prairie, MN.
Aug 9, 10:08 PM CDTHAIL 11 Wnw Eden Prairie, MN
Aug 9, 10:26 PM CDTHAIL 0.752 Sw Bloomington, MN
Aug 9, 10:30 PM CDTHAIL 1.252 W Bloomington, MN
Aug 9, 10:32 PM CDTHAIL 13 W Bloomington, MN.
Aug 9, 10:32 PM CDTHAIL 13 W Bloomington, MN
Aug 9, 10:35 PM CDTHAIL 12 Sw Bloomington, MNSOCIAL MEDIA PICTURE.

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, 2.7 hours before the alert went out and 13 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.

199 
WUUS53 KMPX 100239
SVRMPX
MNC053-139-100330-
/O.NEW.KMPX.SV.W.0091.200810T0239Z-200810T0330Z/

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

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Southeastern Hennepin County in east central Minnesota...
  Northeastern Scott County in east central Minnesota...

* Until 1030 PM CDT.

* At 939 PM CDT, a severe thunderstorm was located near Chanhassen,
  or 16 miles southwest of Minneapolis, moving east at 30 mph.

  HAZARD...Golf ball size hail.

  SOURCE...Public.

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

* Locations impacted include...
  Bloomington, Eden Prairie, Burnsville, Edina, Shakopee, Richfield,
  Savage, Chaska, Chanhassen, Prior Lake, Carver and Credit River.

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 4474 9364 4476 9362 4480 9357 4481 9352
      4489 9351 4488 9326 4480 9327 4479 9333
      4465 9332
TIME...MOT...LOC 0239Z 284DEG 25KT 4481 9354 

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

JRB
3 follow-up statements
800 
WWUS53 KMPX 100257
SVSMPX

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

MNC053-139-100330-
/O.CON.KMPX.SV.W.0091.000000T0000Z-200810T0330Z/
Hennepin MN-Scott MN-
957 PM CDT Sun Aug 9 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR SOUTHEASTERN HENNEPIN AND NORTHEASTERN SCOTT COUNTIES...

At 957 PM CDT, a severe thunderstorm was located over Shakopee, or 16
miles southwest of Minneapolis, moving east at 20 mph.

HAZARD...Two inch hail.

SOURCE...Public.

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

Locations impacted include...
Bloomington, Eden Prairie, Burnsville, Edina, Shakopee, Richfield,
Savage, Chaska, Chanhassen, Prior Lake, Carver and Credit River.

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 4474 9364 4476 9362 4480 9357 4481 9352
      4489 9351 4488 9326 4480 9327 4479 9333
      4465 9332
TIME...MOT...LOC 0257Z 292DEG 17KT 4479 9351 

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

JRB
410 
WWUS53 KMPX 100308
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1008 PM CDT Sun Aug 9 2020

MNC053-139-100330-
/O.CON.KMPX.SV.W.0091.000000T0000Z-200810T0330Z/
Hennepin MN-Scott MN-
1008 PM CDT Sun Aug 9 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR SOUTHEASTERN HENNEPIN AND NORTHEASTERN SCOTT COUNTIES...

At 1008 PM CDT, a severe thunderstorm was located over Eden Prairie,
or 12 miles southwest of Minneapolis, moving east at 25 mph.

HAZARD...Ping pong ball size hail.

SOURCE...Public.

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

Locations impacted include...
Bloomington, Eden Prairie, Burnsville, Edina, Shakopee, Richfield,
Savage, Chaska, Chanhassen, Prior Lake and Flying Cloud Airport.

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 4480 9357 4481 9352 4489 9351 4488 9326
      4480 9327 4479 9333 4469 9332 4478 9360
TIME...MOT...LOC 0308Z 274DEG 21KT 4483 9344 

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

JRB
279 
WWUS53 KMPX 100319
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1019 PM CDT Sun Aug 9 2020

MNC053-139-100330-
/O.CON.KMPX.SV.W.0091.000000T0000Z-200810T0330Z/
Hennepin MN-Scott MN-
1019 PM CDT Sun Aug 9 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR SOUTHEASTERN HENNEPIN AND NORTHEASTERN SCOTT COUNTIES...

At 1019 PM CDT, a severe thunderstorm was located near Savage, or 12
miles southwest of Minneapolis, moving east at 30 mph.

HAZARD...Ping pong ball size hail.

SOURCE...Public.

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

Locations impacted include...
Bloomington, Eden Prairie, Burnsville, Edina, Shakopee, Richfield,
Savage, Prior Lake and Flying Cloud Airport.

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 9354 4481 9352 4489 9351 4488 9326
      4480 9327 4479 9333 4471 9332
TIME...MOT...LOC 0319Z 280DEG 24KT 4480 9338 

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

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, 9:30 PM CDTSevere Thunderstorm WarningMPXCarver45 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.