Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 9, NWS Twin Cities, MN

May 1, 2012Sherburne County, Stearns County, Wright County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 1, 2012, 4:40 PM CDT for Sherburne County, Stearns County, Wright County, Minnesota. It was in force for 35 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 1, 2012, 4:40 PM CDT (21:40 UTC)
Expired
May 1, 2012, 5:15 PM CDT
In force
35 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Sherburne County, MN, Stearns County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 76 km from the middle of the area, began a volume at 21:43 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 1, 2:59 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.7 hours before the alert went out and 74 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 2012-05-01Temperature 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 2012-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 163 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
1291 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
163 m²/s²
0-3 km storm-relative helicity
196 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.

682 
WUUS53 KMPX 012140
SVRMPX
MNC141-145-171-012215-
/O.NEW.KMPX.SV.W.0009.120501T2140Z-120501T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
440 PM CDT TUE MAY 1 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN SHERBURNE COUNTY IN CENTRAL MINNESOTA...
  SOUTHEASTERN STEARNS COUNTY IN CENTRAL MINNESOTA...
  NORTHWESTERN WRIGHT COUNTY IN CENTRAL MINNESOTA...

* UNTIL 515 PM CDT

* AT 438 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.
  THIS STORM WAS LOCATED NEAR KIMBALL...OR ABOUT 16 MILES NORTHEAST
  OF LITCHFIELD...AND MOVING NORTHEAST AT 40 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  KIMBALL...
  SOUTH HAVEN...
  FAIRHAVEN...
  LUXEMBURG...
  ST AUGUSTA...
  CLEARWATER...
  CLEAR LAKE...
  SANTIAGO...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS IN EXCESS OF 60 MPH AND LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT TUESDAY EVENING
FOR SOUTHERN MINNESOTA.

&&

LAT...LON 4522 9425 4523 9426 4529 9427 4528 9436
      4529 9438 4533 9439 4533 9445 4556 9415
      4555 9370
TIME...MOT...LOC 2140Z 225DEG 35KT 4531 9430
WIND...HAIL 60MPH 1.00IN

$$
1 follow-up statement
186 
WWUS53 KMPX 012200
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
500 PM CDT TUE MAY 1 2012

MNC141-145-171-012215-
/O.CON.KMPX.SV.W.0009.000000T0000Z-120501T2215Z/
SHERBURNE MN-STEARNS MN-WRIGHT MN-
500 PM CDT TUE MAY 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
WRIGHT...SOUTHEASTERN STEARNS AND NORTHWESTERN SHERBURNE COUNTIES
UNTIL 515 PM CDT...

AT 456 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR FAIRHAVEN...
OR 14 MILES SOUTH OF ST CLOUD...MOVING NORTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  ST AUGUSTA...CLEARWATER AND CLEAR LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4555 9370 4522 9425 4523 9426 4528 9426
      4535 9429 4549 9413
TIME...MOT...LOC 2200Z 232DEG 24KT 4537 9416
WIND...HAIL 60MPH 1.00IN

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 1, 4:41 AM CDTSpecial Weather StatementMPXDouglas, Morrison, Pope, Stevens, Todd79 min
May 1, 4:12 PM CDTSevere Thunderstorm WarningMPXPope, Stearns33 min
May 1, 4:43 PM CDTSevere Thunderstorm WarningMPXPope, Stearns47 min
May 1, 4:46 PM CDTTornado WarningMPXPope, Stearns44 min
May 1, 5:07 PM CDTTornado WarningMPXSherburne, Stearns, Wright38 min
May 1, 5:08 PM CDTSevere Thunderstorm WarningMPXChippewa, Lac qui Parle, Yellow Medicine67 min
May 1, 5:09 PM CDTTornado WarningMPXStearns36 min
May 1, 5:17 PM CDTSevere Thunderstorm WarningMPXRedwood, Yellow Medicine32 min
May 1, 5:23 PM CDTSevere Thunderstorm WarningMPXBenton, Morrison, Stearns37 min
May 1, 5:38 PM CDTTornado WarningMPXSherburne37 min
May 1, 5:44 PM CDTTornado WarningMPXBenton, Sherburne, Stearns46 min
May 1, 6:08 PM CDTSevere Thunderstorm WarningMPXRedwood52 min
May 1, 6:14 PM CDTSevere Thunderstorm WarningMPXIsanti, Sherburne46 min
May 1, 6:25 PM CDTTornado WarningMPXBenton, Sherburne35 min
May 1, 6:43 PM CDTSevere Thunderstorm WarningMPXBrown, Redwood62 min
May 1, 6:56 PM CDTSevere Thunderstorm WarningMPXBenton, Mille Lacs, Sherburne34 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.