Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 18, 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, 7:08 PM CDT for Sherburne County, Stearns County, Wright County, Minnesota. It was in force for 52 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 1, 2012, 7:08 PM CDT (00:08 UTC)
Expired: May 1, 2012, 8:00 PM CDT
In force: 52 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), 75 km from the middle of the area, began a volume at 00:08 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.

What was reported inside it

Time	Report	Where	Remark
May 1, 7:27 PM CDT	TSTM WND GST 54	Clearwater, MN
May 1, 7:45 PM CDT	TSTM WND DMG	3 N Buffalo, MN	TREE BLOCKING ROAD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
May 1, 2:59 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.1 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 279 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 1279 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 227 m²/s²
0-3 km storm-relative helicity: 393 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

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

623 
WUUS53 KMPX 020008
SVRMPX
MNC141-145-171-020100-
/O.NEW.KMPX.SV.W.0018.120502T0008Z-120502T0100Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 800 PM CDT

* AT 704 PM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS OF 60
  MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM ST CLOUD
  TO ST AUGUSTA TO SOUTH HAVEN...AND MOVING EAST AT 25 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  ST CLOUD...
  SOUTH HAVEN...
  FAIRHAVEN...
  ST AUGUSTA...
  KIMBALL...
  WAITE PARK...
  LUXEMBURG...
  CLEARWATER...
  ANNANDALE...
  CLEAR LAKE...
  HASTY...
  ENFIELD...
  MAPLE LAKE...
  BECKER...

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.

&&

LAT...LON 4558 9416 4556 9415 4556 9362 4538 9366
      4517 9374 4521 9425 4528 9426 4529 9433
      4543 9427 4558 9425
TIME...MOT...LOC 0008Z 275DEG 24KT 4555 9412 4542 9414
          4525 9423
WIND...HAIL 60MPH 1.00IN

$$

1 follow-up statement

947 
WWUS53 KMPX 020025
SVSMPX

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

MNC145-020040-
/O.CAN.KMPX.SV.W.0018.000000T0000Z-120502T0100Z/
STEARNS MN-
725 PM CDT TUE MAY 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN STEARNS COUNTY IS
CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF
THE WARNED AREA.

LAT...LON 4538 9366 4517 9374 4524 9415 4535 9409
      4543 9405 4555 9404 4556 9362
TIME...MOT...LOC 0025Z 275DEG 24KT 4554 9396 4541 9398
          4524 9407

$$

MNC141-171-020100-
/O.CON.KMPX.SV.W.0018.000000T0000Z-120502T0100Z/
SHERBURNE MN-WRIGHT MN-
725 PM CDT TUE MAY 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
WRIGHT AND CENTRAL SHERBURNE COUNTIES UNTIL 800 PM CDT...

AT 722 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS OF 60 MPH. 
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES SOUTH
OF PARENT TO CLEARWATER TO ANNANDALE...MOVING EAST AT 30 MPH. PENNY
SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
  HASTY...MAPLE LAKE...ENFIELD...BECKER...SANTIAGO...MONTICELLO...BIG
  LAKE AND SILVER CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...HAIL...AND DEADLY LIGHTNING. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4538 9366 4517 9374 4524 9415 4535 9409
      4543 9405 4555 9404 4556 9362
TIME...MOT...LOC 0025Z 275DEG 24KT 4554 9396 4541 9398
          4524 9407
WIND...HAIL 60MPH 0.75IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 1, 7:23 PM CDT	Special Weather Statement	MPX	Isanti, Kanabec	52 min
May 1, 7:24 PM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod, Sibley	51 min
May 1, 7:30 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Isanti, Kanabec	45 min
May 1, 7:55 PM CDT	Special Weather Statement	MPX	Anoka	50 min
May 1, 8:08 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Chisago, Isanti	37 min
May 1, 8:09 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Nicollet, Sibley	66 min
May 1, 8:13 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood	25 min
May 1, 9:24 PM CDT	Special Weather Statement	MPX	Nicollet, Sibley	51 min
May 1, 10:11 PM CDT	Special Weather Statement	MPX	Blue Earth, Faribault, Le Sueur, Martin, Nicollet	49 min
May 1, 11:12 PM CDT	Special Weather Statement	MPX	Freeborn, Rice, Steele, Waseca	48 min
May 2, 5:22 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Watonwan	53 min
May 2, 5:50 PM CDT	Tornado Warning	MPX	Blue Earth, Brown, Nicollet, Watonwan	40 min
May 2, 6:20 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Le Sueur, Nicollet, Waseca	55 min
May 2, 6:45 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue, Rice, Steele	60 min
May 2, 6:45 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood	60 min
May 2, 6:58 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice, Steele, Waseca	47 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.