Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 82, NWS Twin Cities, MN

May 23, 2012Brown County, Nicollet County, Watonwan County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 23, 2012, 5:17 PM CDT for Brown County, Nicollet County, Watonwan County, Minnesota. It was in force for 28 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 23, 2012, 5:17 PM CDT (22:17 UTC)
Expired
May 23, 2012, 5:45 PM CDT
In force
28 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
70.0 mph

Counties Brown County, MN, Nicollet County, MN, Watonwan County, MN

The radar

The Minneapolis radar (KMPX), 106 km from the middle of the area, began a volume at 22:19 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, 10.3 hours before the alert went out and 104 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 2012-05-23Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2012-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 354 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1960 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
354 m²/s²
0-3 km storm-relative helicity
362 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

572 
WUUS53 KMPX 232217
SVRMPX
MNC015-103-165-232245-
/O.NEW.KMPX.SV.W.0082.120523T2217Z-120523T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
517 PM CDT WED MAY 23 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN BROWN COUNTY IN SOUTH CENTRAL MINNESOTA...
  WEST CENTRAL NICOLLET COUNTY IN SOUTH CENTRAL MINNESOTA...
  NORTHWESTERN WATONWAN COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 545 PM CDT

* AT 515 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DESTRUCTIVE WINDS IN EXCESS OF 70
  MPH. THIS STORM WAS LOCATED NEAR DARFUR...OR ABOUT 7 MILES
  NORTHWEST OF ST JAMES...AND MOVING NORTHEAST AT 60 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  ST JAMES...
  NEW ULM...
  LA SALLE...
  HANSKA...
  KLOSSNER...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS...WHICH CAN UPROOT
TREES...DOWN POWER LINES...AND CAUSE DAMAGE TO ROOFS AND WINDOWS.
EVACUATE MOBILE HOMES AS THEY MAY BE OVERTURNED. LARGE HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE DAMAGE TO VEHICLES AND WINDOWS. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4443 9458 4433 9432 4396 9464 4408 9485
TIME...MOT...LOC 2217Z 214DEG 51KT 4407 9472
WIND...HAIL 70MPH 1.00IN

$$
1 follow-up statement
290 
WWUS53 KMPX 232231
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
531 PM CDT WED MAY 23 2012

MNC015-103-165-232245-
/O.CON.KMPX.SV.W.0082.000000T0000Z-120523T2245Z/
BROWN MN-NICOLLET MN-WATONWAN MN-
531 PM CDT WED MAY 23 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
WATONWAN...WEST CENTRAL NICOLLET AND EASTERN BROWN COUNTIES UNTIL 545
PM CDT...

AT 529 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DESTRUCTIVE
WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 7 MILES SOUTHEAST
OF SLEEPY EYE...OR 11 MILES SOUTHWEST OF NEW ULM...MOVING NORTH AT 50
MPH.

LOCATIONS IMPACTED INCLUDE...
  NEW ULM AND KLOSSNER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS...WHICH CAN UPROOT
TREES...DOWN POWER LINES...AND CAUSE DAMAGE TO ROOFS AND WINDOWS.
EVACUATE MOBILE HOMES AS THEY MAY BE OVERTURNED. LARGE HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE DAMAGE TO VEHICLES AND WINDOWS. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4443 9458 4433 9432 4396 9464 4408 9485
TIME...MOT...LOC 2231Z 202DEG 44KT 4424 9464
WIND...HAIL 70MPH 1.00IN

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 23, 3:23 AM CDTFlash Flood WatchMPXAnoka, Benton, Blue Earth, Brown, Carver, Chisago and 22 more34 hr
May 23, 10:56 AM CDTWind AdvisoryMPXBlue Earth, Faribault, Freeborn, Martin, Steele, Waseca8 hr
May 23, 12:39 PM CDTSevere Thunderstorm WarningMPXDouglas, Pope, Todd51 min
May 23, 1:03 PM CDTSpecial Weather StatementMPXKanabec27 min
May 23, 2:06 PM CDTSpecial Weather StatementMPXChippewa, Douglas, Kandiyohi, Lac qui Parle, Morrison, Pope and 4 more84 min
May 23, 5:08 PM CDTSevere Thunderstorm WarningMPXMcLeod, Nicollet, Sibley37 min
May 23, 5:45 PM CDTSevere Thunderstorm WarningMPXBrown, Nicollet, Sibley34 min
May 23, 5:59 PM CDTSpecial Weather StatementMPXRedwood46 min
May 23, 6:51 PM CDTSpecial Weather StatementMPXRenville39 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012Every severe thunderstorm warning in 2012

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.