Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 215, NWS Twin Cities, MN

July 5, 2012Chisago County, Minnesota; Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 5, 2012, 1:11 AM CDT for Chisago County, Minnesota; Polk County, Wisconsin. It was in force for 16 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: Jul 5, 2012, 1:11 AM CDT (06:11 UTC)
Expired: Jul 5, 2012, 1:27 AM CDT
In force: 16 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Chisago County, MN, Polk County, WI

The radar

The Minneapolis radar (KMPX), 102 km from the middle of the area, began a volume at 06:11 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
Jul 4, 8:59 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 6.2 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-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: 2542 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1972 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.8

Open this sounding in Storm Lab

The text

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

950 
WUUS53 KMPX 050611
SVRMPX
MNC025-WIC095-050645-
/O.NEW.KMPX.SV.W.0215.120705T0611Z-120705T0645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
111 AM CDT THU JUL 5 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN CHISAGO COUNTY IN EAST CENTRAL MINNESOTA...
  EXTREME NORTHWESTERN POLK COUNTY IN NORTHWEST WISCONSIN...

* UNTIL 145 AM CDT

* AT 107 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING
  WINDS OF 60 MPH. THIS STORM WAS LOCATED NEAR STANCHFIELD...OR ABOUT
  10 MILES NORTHEAST OF CAMBRIDGE...AND MOVING SOUTHEAST AT 30 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  RUSH CITY...
  HARRIS...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER LINES.
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM CDT THURSDAY MORNING
FOR EAST CENTRAL MINNESOTA AND NORTHWEST WISCONSIN.

&&

LAT...LON 4570 9286 4565 9287 4565 9280 4564 9279
      4550 9287 4559 9314 4573 9306
TIME...MOT...LOC 0611Z 294DEG 25KT 4567 9307
WIND...HAIL 60MPH 1.75IN

$$

CLF

1 follow-up statement

514 
WWUS53 KMPX 050627
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
127 AM CDT THU JUL 5 2012

MNC025-WIC095-050642-
/O.CAN.KMPX.SV.W.0215.000000T0000Z-120705T0645Z/
CHISAGO MN-POLK WI-
127 AM CDT THU JUL 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME NORTHWESTERN POLK AND
NORTHWESTERN CHISAGO COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

LAT...LON 4570 9286 4565 9287 4565 9280 4564 9279
      4550 9287 4559 9314 4573 9306
TIME...MOT...LOC 0627Z 294DEG 25KT 4562 9292

$$

CLF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 8:13 PM CDT	Special Weather Statement	MPX	Kanabec	62 min
Jul 4, 8:28 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec, Mille Lacs	77 min
Jul 4, 9:44 PM CDT	Tornado Warning	MPX	Morrison, Todd	31 min
Jul 4, 10:15 PM CDT	Severe Thunderstorm Warning	MPX	Morrison	15 min
Jul 4, 10:17 PM CDT	Special Weather Statement	MPX	Morrison	28 min
Jul 4, 10:57 PM CDT	Special Weather Statement	MPX	Mille Lacs	48 min
Jul 4, 11:46 PM CDT	Special Weather Statement	MPX	Mille Lacs	29 min
Jul 5, 12:04 AM CDT	Severe Thunderstorm Warning	MPX	Kanabec, Mille Lacs	41 min
Jul 5, 12:34 AM CDT	Severe Thunderstorm Warning	MPX	Chisago, Isanti, Kanabec, Mille Lacs	41 min
Jul 5, 3:25 AM CDT	Special Weather Statement	MPX	Watonwan	50 min
Jul 5, 4:03 AM CDT	Special Weather Statement	MPX	Watonwan	42 min
Jul 5, 5:07 AM CDT	Special Weather Statement	MPX	Wright	38 min
Jul 5, 6:01 AM CDT	Special Weather Statement	MPX	Carver	44 min
Jul 5, 6:30 AM CDT	Special Weather Statement	MPX	McLeod	30 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012 Severe Thunderstorm Warnings in Wisconsin, 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.