Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 21, NWS Sioux Falls, SD

May 8, 2018Cottonwood County, Jackson County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 8, 2018, 8:46 PM CDT for Cottonwood County, Jackson County, Minnesota. It was in force for 29 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
May 8, 2018, 8:46 PM CDT (01:46 UTC)
Expired
May 8, 2018, 9:15 PM CDT
In force
29 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Cottonwood County, MN, Jackson County, MN

The radar

The Sioux Falls radar (KFSD), 149 km from the middle of the area, began a volume at 01:48 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, 1.8 hours before the alert went out and 154 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 2018-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2018-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 127 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1184 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
127 m²/s²
0-3 km storm-relative helicity
195 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

394 
WUUS53 KFSD 090146
SVRFSD
MNC033-063-090215-
/O.NEW.KFSD.SV.W.0021.180509T0146Z-180509T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
846 PM CDT TUE MAY 8 2018

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Northeastern Jackson County in southwestern Minnesota...
  Southeastern Cottonwood County in southwestern Minnesota...

* Until 915 PM CDT.

* At 846 PM CDT, a severe thunderstorm was located near Mountain
  Lake, or 8 miles east of Windom, moving north at 30 mph.

  HAZARD...60 mph wind gusts and half dollar 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...
  Mountain Lake around 855 PM CDT.
  Comfrey around 915 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4366 9486 4369 9509 4411 9502 4411 9486
      4385 9486 4383 9485 4368 9485
TIME...MOT...LOC 0146Z 196DEG 26KT 4389 9494 

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

BT
2 follow-up statements
577 
WWUS53 KFSD 090202
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
902 PM CDT TUE MAY 8 2018

MNC033-063-090215-
/O.CON.KFSD.SV.W.0021.000000T0000Z-180509T0215Z/
Jackson MN-Cottonwood MN-
902 PM CDT TUE MAY 8 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR NORTHEASTERN JACKSON AND SOUTHEASTERN COTTONWOOD COUNTIES...

At 902 PM CDT, a severe thunderstorm was located near Mountain Lake,
or 14 miles northeast of Windom, moving north at 30 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...
  Comfrey around 915 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4375 9486 4379 9502 4411 9492 4411 9486
      4385 9486 4383 9485 4368 9485
TIME...MOT...LOC 0202Z 196DEG 26KT 4400 9489 

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

BT
778 
WWUS53 KFSD 090206
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
906 PM CDT TUE MAY 8 2018

MNC033-063-090216-
/O.EXP.KFSD.SV.W.0021.000000T0000Z-180509T0215Z/
Jackson MN-Cottonwood MN-
906 PM CDT TUE MAY 8 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JACKSON AND
SOUTHEASTERN COTTONWOOD COUNTIES WILL EXPIRE AT 915 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

LAT...LON 4375 9486 4379 9502 4411 9492 4411 9486
      4385 9486 4383 9485 4368 9485
TIME...MOT...LOC 0206Z 196DEG 26KT 4403 9488 

$$

BT

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 8, 8:14 PM CDTSevere Thunderstorm WarningFSDJackson46 min
May 8, 8:58 PM CDTSevere Thunderstorm WarningFSDJackson32 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2018Every severe thunderstorm warning in 2018

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.