Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS Twin Cities, MN

June 18, 20204 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 18, 2020, 4:07 PM CDT for 4 counties in Minnesota. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 18, 2020, 4:07 PM CDT (21:07 UTC)
Expired: Jun 18, 2020, 4:45 PM CDT
In force: 38 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Brown County, MN, Nicollet County, MN, Renville County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 101 km from the middle of the area, began a volume at 21:07 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.1 hours before the alert went out and 99 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: 39 J/kg
Mixed-layer CIN: -270 J/kg
Mixed-layer LCL: 1316 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 319 m²/s²
0-3 km storm-relative helicity: 276 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

526 
WUUS53 KMPX 182107
SVRMPX
MNC015-103-129-143-182145-
/O.NEW.KMPX.SV.W.0021.200618T2107Z-200618T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
407 PM CDT Thu Jun 18 2020

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Southwestern Sibley County in central Minnesota...
  North central Brown County in south central Minnesota...
  Southeastern Renville County in central Minnesota...
  Northwestern Nicollet County in south central Minnesota...

* Until 445 PM CDT.

* At 406 PM CDT, a severe thunderstorm was located 7 miles north of
  Sleepy Eye, or 16 miles northwest of New Ulm, moving northeast at
  25 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Gibbon, Lafayette, Evan and St George. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4432 9486 4444 9486 4461 9455 4442 9435
TIME...MOT...LOC 2106Z 243DEG 23KT 4441 9477 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

Dye

1 follow-up statement

771 
WWUS53 KMPX 182136
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
436 PM CDT Thu Jun 18 2020

MNC015-103-129-143-182146-
/O.EXP.KMPX.SV.W.0021.000000T0000Z-200618T2145Z/
Sibley MN-Brown MN-Renville MN-Nicollet MN-
436 PM CDT Thu Jun 18 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SIBLEY...NORTH
CENTRAL BROWN...SOUTHEASTERN RENVILLE AND NORTHWESTERN NICOLLET
COUNTIES WILL EXPIRE AT 445 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 4432 9486 4444 9486 4461 9455 4442 9435
TIME...MOT...LOC 2136Z 243DEG 23KT 4449 9455 

$$

Dye

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 4:31 AM CDT	Special Weather Statement	MPX	Chippewa, Pope, Swift	59 min
Jun 18, 5:31 AM CDT	Special Weather Statement	MPX	Kandiyohi, Pope, Renville	59 min
Jun 18, 6:32 AM CDT	Special Weather Statement	MPX	Kandiyohi, Stearns	58 min
Jun 18, 3:29 PM CDT	Special Weather Statement	MPX	Renville	31 min
Jun 18, 3:56 PM CDT	Special Weather Statement	MPX	Brown	34 min
Jun 18, 4:02 PM CDT	Special Weather Statement	MPX	McLeod	28 min
Jun 18, 4:30 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Nicollet, Sibley	45 min
Jun 18, 4:35 PM CDT	Special Weather Statement	MPX	Wright	25 min
Jun 18, 4:36 PM CDT	Special Weather Statement	MPX	Watonwan	39 min
Jun 18, 4:36 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Nicollet, Sibley	39 min
Jun 18, 4:58 PM CDT	Special Weather Statement	MPX	Wright	32 min
Jun 18, 5:12 PM CDT	Special Weather Statement	MPX	Watonwan	33 min
Jun 18, 5:15 PM CDT	Special Weather Statement	MPX	Carver, Nicollet, Sibley	45 min
Jun 18, 5:16 PM CDT	Special Weather Statement	MPX	Martin	59 min
Jun 18, 5:32 PM CDT	Special Weather Statement	MPX	Anoka	43 min
Jun 18, 5:45 PM CDT	Special Weather Statement	MPX	Blue Earth	60 min
Jun 18, 5:58 PM CDT	Special Weather Statement	MPX	Faribault	62 min
Jun 18, 6:04 PM CDT	Special Weather Statement	MPX	Dakota	41 min
Jun 18, 6:28 PM CDT	Special Weather Statement	MPX	Dakota, Hennepin, Ramsey, Washington	47 min
Jun 18, 6:52 PM CDT	Special Weather Statement	MPX	Freeborn, Steele, Waseca	23 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.