Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 212, NWS Twin Cities, MN

July 4, 2012Morrison County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 4, 2012, 10:15 PM CDT for Morrison County, Minnesota. It was in force for 15 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 4, 2012, 10:15 PM CDT (03:15 UTC)
Expired: Jul 4, 2012, 10:30 PM CDT
In force: 15 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Morrison County, MN

The radar

The Minneapolis radar (KMPX), 174 km from the middle of the area, began a volume at 03:16 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, 3.3 hours before the alert went out and 173 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.

602 
WUUS53 KMPX 050315
SVRMPX
MNC097-050330-
/O.NEW.KMPX.SV.W.0212.120705T0315Z-120705T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1015 PM CDT WED JUL 4 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MORRISON COUNTY IN CENTRAL MINNESOTA...

* UNTIL 1030 PM CDT

* AT 1013 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS OF 60 MPH. THIS
  STORM WAS LOCATED NEAR PILLAGER...OR ABOUT 12 MILES WEST OF
  BRAINERD...AND MOVING EAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  MAINLY RURAL AREAS OF EXTREME NORTHERN MORRISON COUNTY.

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 300 AM CDT THURSDAY MORNING
FOR EAST CENTRAL MINNESOTA AND NORTHWEST WISCONSIN.

&&

LAT...LON 4633 9440 4629 9434 4626 9434 4621 9439
      4626 9457 4631 9454 4634 9446
TIME...MOT...LOC 0315Z 292DEG 29KT 4630 9441
WIND...HAIL 60MPH 1.00IN

$$

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, 10:17 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, 1:11 AM CDT	Severe Thunderstorm Warning	MPX	Chisago	16 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 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.