Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 52, NWS Twin Cities, MN

May 4, 2012Freeborn County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 4, 2012, 6:15 PM CDT for Freeborn County, Minnesota. It was in force for 45 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 4, 2012, 6:15 PM CDT (23:15 UTC)
Expired: May 4, 2012, 7:00 PM CDT
In force: 45 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.88 in
Wind: 70.0 mph

County Freeborn County, MN

The radar

The Minneapolis radar (KMPX), 134 km from the middle of the area, began a volume at 23:17 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.

Issued	Product	Office	Lasted
May 4, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.3 hours before the alert went out and 135 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1101 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -52 m²/s²
0-3 km storm-relative helicity: 15 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.

306 
WUUS53 KMPX 042315
SVRMPX
MNC047-050000-
/O.NEW.KMPX.SV.W.0052.120504T2315Z-120505T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
615 PM CDT FRI MAY 4 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  FREEBORN COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 700 PM CDT

* AT 612 PM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE
  STORMS WERE LOCATED ALONG A LINE EXTENDING FROM FREEBORN TO TWIN
  LAKES TO 13 MILES SOUTHWEST OF NORTHWOOD...AND MOVING EAST AT 30
  MPH.  NICKEL SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IN THE WARNING INCLUDE...
  ALBERT LEA...
  HAYWARD...
  FREEBORN...
  TWIN LAKES...
  CONGER...
  ALDEN...
  EMMONS...
  MANCHESTER...
  GLENVILLE...
  CLARKS GROVE...
  MYRTLE...
  GENEVA...
  LONDON...
  HOLLANDALE...

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. HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE MINOR DAMAGE TO VEHICLES AND WINDOWS. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

&&

LAT...LON 4356 9351 4372 9365 4385 9364 4385 9305
      4350 9304 4349 9348
TIME...MOT...LOC 2315Z 267DEG 28KT 4378 9356 4353 9337
          4327 9330
WIND...HAIL 70MPH 0.88IN

$$

BAP

1 follow-up statement

916 
WWUS53 KMPX 042350
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
650 PM CDT FRI MAY 4 2012

MNC047-050000-
/O.CON.KMPX.SV.W.0052.000000T0000Z-120505T0000Z/
FREEBORN MN-
650 PM CDT FRI MAY 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FREEBORN
COUNTY UNTIL 700 PM CDT...

AT 649 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 HOLLANDALE TO
LONDON TO 13 MILES SOUTHWEST OF STACYVILLE...MOVING EAST AT 30 MPH.
NICKEL SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
  MYRTLY...LONDON...GORDONSVILLE...AND RURAL AREAS OF EASTERN 
  FREEBORN COUNTY.

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 4359 9339 4369 9352 4378 9339 4377 9305
      4350 9304 4349 9329
TIME...MOT...LOC 2350Z 267DEG 28KT 4379 9318 4355 9300
          4328 9293
WIND...HAIL 60MPH 0.88IN

$$

BAP

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 7:00 PM CDT	Special Weather Statement	MPX	Goodhue	30 min
May 4, 2:07 PM CDT	Special Weather Statement	MPX	Redwood	38 min
May 4, 2:33 PM CDT	Special Weather Statement	MPX	Blue Earth, Martin, Watonwan	57 min
May 4, 3:10 PM CDT	Tornado Warning	MPX	Martin	35 min
May 4, 3:40 PM CDT	Tornado Warning	MPX	Martin	50 min
May 4, 4:07 PM CDT	Special Weather Statement	MPX	Blue Earth, Waseca, Watonwan	38 min
May 4, 4:22 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Martin	38 min
May 4, 4:32 PM CDT	Severe Thunderstorm Warning	MPX	Martin	13 min
May 4, 5:00 PM CDT	Special Weather Statement	MPX	Faribault	45 min
May 4, 5:41 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn	49 min
May 4, 5:52 PM CDT	Tornado Warning	MPX	Faribault, Freeborn	23 min
May 4, 6:21 PM CDT	Tornado Warning	MPX	Freeborn	24 min
May 4, 6:24 PM CDT	Areal Flood Advisory	MPX	Blue Earth, Faribault, Martin, Watonwan	3 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.