Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 48, NWS Twin Cities, MN

July 11, 2020McLeod County, Sibley County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 11, 2020, 1:48 PM CDT for McLeod County, Sibley County, Minnesota. It was in force for 57 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
Jul 11, 2020, 1:48 PM CDT (18:48 UTC)
Expired
Jul 11, 2020, 2:45 PM CDT
In force
57 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Tornado
Possible
Hail
2.0 in
Wind
70.0 mph

Counties McLeod County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 75 km from the middle of the area, began a volume at 18:49 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
Jul 11, 2:06 PM CDTHAIL 2.53 Ssw Stewart, MN
Jul 11, 2:12 PM CDTHAIL 1.252 N Winthrop, MN
Jul 11, 2:23 PM CDTHAIL 1.251 Sw Winthrop, MN
Jul 11, 2:28 PM CDTHAIL 11 S Winthrop, MN
Jul 11, 2:32 PM CDTHAIL 12 Se Winthrop, MN2 MILES EAST OF THE INTERSECTION OF HWY 15 AND CO RD. 8.
Jul 11, 2:38 PM CDTHAIL 1.752 Ne Lafayette, 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.

IssuedProductOfficeLasted
Jul 11, 1:10 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 6.8 hours before the alert went out and 73 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 12:00Z on 2020-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 52 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 12:00Z on 2020-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 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
52 J/kg
Mixed-layer CIN
-178 J/kg
Mixed-layer LCL
1331 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
69 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

480 
WUUS53 KMPX 111848
SVRMPX
MNC085-143-111945-
/O.NEW.KMPX.SV.W.0048.200711T1848Z-200711T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
148 PM CDT Sat Jul 11 2020

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Western Sibley County in central Minnesota...
  Southwestern McLeod County in central Minnesota...

* Until 245 PM CDT.

* At 148 PM CDT, a severe thunderstorm was located over Buffalo Lake,
  or 14 miles southwest of Hutchinson, moving southeast at 30 mph.

  HAZARD...Two inch hail and 70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Gaylord, Winthrop, Gibbon, Brownton, Stewart, Lafayette, Sumter,
  New Auburn, Fernando and Lake Marion Regional Park.

This includes U.S. Highway 212 between mile markers 102 and 117.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4459 9463 4465 9463 4472 9456 4472 9450
      4477 9450 4485 9440 4467 9406 4445 9436
      4446 9450
TIME...MOT...LOC 1848Z 309DEG 27KT 4472 9456 

TORNADO...POSSIBLE
HAIL...2.00IN
WIND...70MPH
 
$$

CTG
3 follow-up statements
436 
WWUS53 KMPX 111857
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
157 PM CDT Sat Jul 11 2020

MNC085-143-111945-
/O.CON.KMPX.SV.W.0048.000000T0000Z-200711T1945Z/
Sibley MN-McLeod MN-
157 PM CDT Sat Jul 11 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM CDT
FOR WESTERN SIBLEY AND SOUTHWESTERN MCLEOD COUNTIES...

At 156 PM CDT, a severe thunderstorm was located near Stewart, or 15
miles south of Hutchinson, moving southeast at 30 mph.

This is a very dangerous storm.

HAZARD...Baseball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Gaylord, Winthrop, Gibbon, Brownton, Stewart, Lafayette, Sumter, New
Auburn, Fernando and Lake Marion Regional Park.

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 4459 9463 4465 9463 4472 9456 4472 9450
      4477 9450 4485 9440 4467 9406 4445 9436
      4446 9450
TIME...MOT...LOC 1856Z 309DEG 27KT 4468 9449 

TORNADO...POSSIBLE
HAIL...2.75IN
WIND...70MPH
 
$$

CTG
571 
WWUS53 KMPX 111917
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
217 PM CDT Sat Jul 11 2020

MNC085-143-111945-
/O.CON.KMPX.SV.W.0048.000000T0000Z-200711T1945Z/
Sibley MN-McLeod MN-
217 PM CDT Sat Jul 11 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM CDT
FOR WESTERN SIBLEY AND SOUTHWESTERN MCLEOD COUNTIES...

At 216 PM CDT, a severe thunderstorm was located near Winthrop, or 20
miles north of New Ulm, moving southeast at 30 mph.

HAZARD...Tennis ball size hail and 70 mph wind gusts.

SOURCE...Trained weather spotters reported tennis ball size hail 3 
         miles south-southwest of Stewart at 206 PM CDT.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Gaylord, Winthrop, Gibbon, Brownton, Lafayette, Sumter, New Auburn
and Fernando.

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 4454 9454 4469 9447 4480 9430 4467 9406
      4445 9436 4446 9450
TIME...MOT...LOC 1916Z 309DEG 27KT 4458 9432 

TORNADO...POSSIBLE
HAIL...2.50IN
WIND...70MPH
 
$$

CTG
459 
WWUS53 KMPX 111930
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
230 PM CDT Sat Jul 11 2020

MNC085-143-111945-
/O.CON.KMPX.SV.W.0048.000000T0000Z-200711T1945Z/
Sibley MN-McLeod MN-
230 PM CDT Sat Jul 11 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM CDT
FOR WESTERN SIBLEY AND SOUTH CENTRAL MCLEOD COUNTIES...

At 229 PM CDT, a severe thunderstorm was located over Gaylord, or 19
miles northeast of New Ulm, moving southeast at 30 mph.

HAZARD...Tennis ball size hail and 70 mph wind gusts.

SOURCE...Trained weather spotters.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Gaylord, Winthrop and New Auburn. 

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 4472 9432 4473 9417 4467 9406 4445 9436
      4451 9445
TIME...MOT...LOC 1929Z 309DEG 27KT 4452 9421 

TORNADO...POSSIBLE
HAIL...2.50IN
WIND...70MPH
 
$$

CTG

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 5:32 AM CDTSevere Thunderstorm WarningMPXSteele28 min
Jul 11, 10:43 AM CDTSpecial Weather StatementMPXDouglas, Pope, Stevens47 min
Jul 11, 11:17 AM CDTSevere Thunderstorm WarningMPXSwift43 min
Jul 11, 11:34 AM CDTSpecial Weather StatementMPXTodd56 min
Jul 11, 12:00 PM CDTSpecial Weather StatementMPXKandiyohi45 min
Jul 11, 12:32 PM CDTSevere Thunderstorm WarningMPXKandiyohi, Renville58 min
Jul 11, 12:39 PM CDTSpecial Weather StatementMPXMeeker51 min
Jul 11, 12:57 PM CDTSpecial Weather StatementMPXTodd33 min
Jul 11, 1:05 PM CDTSevere Thunderstorm WarningMPXMcLeod, Meeker, Renville, Sibley55 min
Jul 11, 1:20 PM CDTSevere Thunderstorm WarningMPXChippewa, Redwood, Renville, Yellow Medicine40 min
Jul 11, 1:28 PM CDTSevere Thunderstorm WarningMPXRedwood47 min
Jul 11, 2:01 PM CDTSpecial Weather StatementMPXPope44 min
Jul 11, 2:15 PM CDTSevere Thunderstorm WarningMPXPope45 min
Jul 11, 2:20 PM CDTSevere Thunderstorm WarningMPXMartin40 min
Jul 11, 2:23 PM CDTSevere Thunderstorm WarningMPXNicollet, Sibley52 min
Jul 11, 2:42 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Brown, Nicollet33 min
Jul 11, 2:57 PM CDTSevere Thunderstorm WarningMPXMartin, Watonwan48 min
Jul 11, 3:03 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Brown, Le Sueur, Nicollet42 min
Jul 11, 3:10 PM CDTTornado WarningMPXBlue Earth, Nicollet20 min
Jul 11, 3:26 PM CDTSevere Thunderstorm WarningMPXFaribault, Martin49 min
Jul 11, 3:32 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Faribault, Freeborn, Steele, Waseca43 min
Jul 11, 4:05 PM CDTSevere Thunderstorm WarningMPXFreeborn, Steele, Waseca55 min
Jul 11, 4:17 PM CDTSpecial Weather StatementMPXFaribault58 min
Jul 11, 4:35 PM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn25 min
Jul 11, 6:16 PM CDTSpecial Weather StatementMPXHennepin59 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.