Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 2, NWS Twin Cities, MN

April 13, 2018Blue Earth County, Brown County, Watonwan County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 13, 2018, 6:44 PM CDT for Blue Earth County, Brown County, Watonwan County, Minnesota. It was in force for 31 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
Apr 13, 2018, 6:44 PM CDT (23:44 UTC)
Expired
Apr 13, 2018, 7:15 PM CDT
In force
31 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Blue Earth County, MN, Brown County, MN, Watonwan County, MN

The radar

The Minneapolis radar (KMPX), 98 km from the middle of the area, began a volume at 23:45 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, 11.7 hours before the alert went out and 97 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 2018-04-13Temperature 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 12:00Z on 2018-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -62 square meters per square second.1939587897Sfc1 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
723 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
-62 m²/s²
0-3 km storm-relative helicity
33 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

975 
WUUS53 KMPX 132344
SVRMPX
MNC013-015-165-140015-
/O.NEW.KMPX.SV.W.0002.180413T2344Z-180414T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
644 PM CDT FRI APR 13 2018

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Southeastern Brown County in south central Minnesota...
  Northwestern Blue Earth County in south central Minnesota...
  Northeastern Watonwan County in south central Minnesota...

* Until 715 PM CDT

* At 644 PM CDT, a severe thunderstorm was located near Madelia, or
  21 miles south of New Ulm, moving north at 35 mph.

  HAZARD...Quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Damage to vehicles is expected. 

* This severe thunderstorm will be near,
  Madelia around 650 PM CDT. 
  Hanska around 700 PM CDT. 
  Courtland around 715 PM CDT. 

Other locations impacted by this severe thunderstorm include New Ulm
Airport, St James Airport, Grogan, Searles and La Salle.

This includes U.S. Highway 14 between mile markers 100 and 103.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4391 9436 4397 9459 4436 9452 4434 9446
      4427 9441 4426 9433 4421 9424 4422 9422
      4420 9422 4419 9418
TIME...MOT...LOC 2344Z 198DEG 30KT 4400 9446 

HAIL...1.00IN
WIND...<50MPH
 
$$

BORGHOFF
2 follow-up statements
012 
WWUS53 KMPX 132357
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
657 PM CDT FRI APR 13 2018

MNC165-140007-
/O.CAN.KMPX.SV.W.0002.000000T0000Z-180414T0015Z/
Watonwan MN-
657 PM CDT FRI APR 13 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WATONWAN COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4411 9437 4413 9452 4433 9446 4427 9441
      4426 9433 4421 9424 4422 9422 4420 9422
      4419 9418 4409 9434
TIME...MOT...LOC 2357Z 203DEG 27KT 4419 9442 

$$

MNC013-015-140015-
/O.CON.KMPX.SV.W.0002.000000T0000Z-180414T0015Z/
Brown MN-Blue Earth MN-
657 PM CDT FRI APR 13 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR SOUTHEASTERN BROWN AND NORTHWESTERN BLUE EARTH COUNTIES...

At 657 PM CDT, a severe thunderstorm was located over Searles, or 8
miles south of New Ulm, moving northeast at 30 mph.

HAZARD...Quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Damage to vehicles is expected. 

This severe storm will be near...
  New Ulm and Courtland around 710 PM CDT. 

Other locations impacted by this severe thunderstorm include Searles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4411 9437 4413 9452 4433 9446 4427 9441
      4426 9433 4421 9424 4422 9422 4420 9422
      4419 9418 4409 9434
TIME...MOT...LOC 2357Z 203DEG 27KT 4419 9442 

HAIL...1.00IN
WIND...<50MPH
 
$$

BORGHOFF
983 
WWUS53 KMPX 140007
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
707 PM CDT FRI APR 13 2018

MNC013-015-140017-
/O.EXP.KMPX.SV.W.0002.000000T0000Z-180414T0015Z/
Brown MN-Blue Earth MN-
707 PM CDT FRI APR 13 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BROWN AND
NORTHWESTERN BLUE EARTH COUNTIES WILL EXPIRE AT 715 PM CDT...
    
The severe thunderstorm which prompted the warning has weakened and 
moved out of the warned area. Therefore, the warning will be allowed 
to expire.

LAT...LON 4411 9437 4413 9452 4433 9446 4427 9441
      4426 9433 4421 9424 4422 9422 4420 9422
      4419 9418 4409 9434
TIME...MOT...LOC 0007Z 198DEG 30KT 4427 9439 

$$

BORGHOFF

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 12, 9:34 PM CDTWinter Storm WarningMPXAnoka, Benton, Blue Earth, Brown, Carver, Chisago and 24 more3 days
Apr 13, 8:26 AM CDTSpecial Weather StatementMPXBrown, Redwood64 min
Apr 13, 9:01 AM CDTSevere Thunderstorm WarningMPXBlue Earth, Brown, Watonwan14 min
Apr 13, 10:14 AM CDTSpecial Weather StatementMPXDakota, Rice46 min
Apr 13, 11:15 AM CDTRiver Flood WarningMPXBrown48 hr
Apr 13, 12:36 PM CDTSpecial Weather StatementMPXYellow Medicine39 min
Apr 13, 1:21 PM CDTSpecial Weather StatementMPXRedwood24 min
Apr 13, 3:12 PM CDTWinter Weather AdvisoryMPXAnoka, Benton, Blue Earth, Brown, Carver, Chippewa and 31 more57 hr
Apr 13, 3:20 PM CDTSpecial Weather StatementMPXSteele25 min
Apr 13, 3:57 PM CDTSpecial Weather StatementMPXFreeborn33 min
Apr 13, 6:24 PM CDTSpecial Weather StatementMPXMartin, Watonwan51 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.