Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 148, NWS Twin Cities, MN

August 16, 2020Martin County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 16, 2020, 8:51 PM CDT for Martin County, Minnesota. It was in force for 39 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
Aug 16, 2020, 8:51 PM CDT (01:51 UTC)
Expired
Aug 16, 2020, 9:30 PM CDT
In force
39 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Martin County, MN

The radar

The Minneapolis radar (KMPX), 156 km from the middle of the area, began a volume at 01:53 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 00:00Z, 1.9 hours before the alert went out and 155 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 2020-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 47 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 2020-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.19395878Sfc1 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
47 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1838 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
192 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

828 
WUUS53 KMPX 170151
SVRMPX
MNC091-170230-
/O.NEW.KMPX.SV.W.0148.200817T0151Z-200817T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
851 PM CDT Sun Aug 16 2020

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Southeastern Martin County in south central Minnesota...

* Until 930 PM CDT.

* At 850 PM CDT, a severe thunderstorm was located over Fairmont,
  moving southeast at 20 mph.

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

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Iowa Lake around 915 PM CDT.

Other locations impacted by this severe thunderstorm include Fairmont
Airport, Wilbert and East Chain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4368 9467 4376 9451 4350 9425 4350 9455
TIME...MOT...LOC 0150Z 323DEG 19KT 4362 9452 

HAIL...1.00IN
WIND...60MPH
 
$$

LS
2 follow-up statements
272 
WWUS53 KMPX 170202
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
902 PM CDT Sun Aug 16 2020

MNC091-170230-
/O.CON.KMPX.SV.W.0148.000000T0000Z-200817T0230Z/
Martin MN-
902 PM CDT Sun Aug 16 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR SOUTHEASTERN MARTIN COUNTY...

At 902 PM CDT, a severe thunderstorm was located near Fairmont,
moving southeast at 20 mph.

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

SOURCE...Radar indicated.

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

This severe storm will be near...
  Iowa Lake around 915 PM CDT.

Other locations impacted by this severe thunderstorm include Fairmont
Airport, Wilbert and East Chain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4364 9464 4370 9445 4350 9425 4350 9455
TIME...MOT...LOC 0202Z 323DEG 19KT 4357 9447 

HAIL...1.00IN
WIND...60MPH
 
$$

LS
714 
WWUS53 KMPX 170212
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
912 PM CDT Sun Aug 16 2020

MNC091-170230-
/O.CON.KMPX.SV.W.0148.000000T0000Z-200817T0230Z/
Martin MN-
912 PM CDT Sun Aug 16 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR SOUTHEASTERN MARTIN COUNTY...

At 912 PM CDT, a severe thunderstorm was located over Iowa Lake, or 7
miles south of Fairmont, moving southeast at 20 mph.

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

SOURCE...Radar indicated.

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

This severe storm will be near...
  Iowa Lake around 915 PM CDT.

Other locations impacted by this severe thunderstorm include Wilbert
and East Chain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4360 9461 4365 9440 4350 9425 4350 9455
TIME...MOT...LOC 0212Z 325DEG 19KT 4352 9447 

HAIL...1.00IN
WIND...60MPH
 
$$

LS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 8:31 PM CDTSpecial Weather StatementMPXMartin59 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.