Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 211, NWS Twin Cities, MN

July 4, 2012Kanabec County, Mille Lacs County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 4, 2012, 8:28 PM CDT for Kanabec County, Mille Lacs County, Minnesota. It was in force for 77 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, 8:28 PM CDT (01:28 UTC)
Expired
Jul 4, 2012, 9:45 PM CDT
In force
77 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Kanabec County, MN, Mille Lacs County, MN

The radar

The Duluth radar (KDLH), 113 km from the middle of the area, began a volume at 01:29 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.5 hours before the alert went out and 150 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 00:00Z on 2012-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2542 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2012-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 square meters per square second.193958Sfc1 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
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.

200 
WUUS53 KMPX 050128
SVRMPX
MNC065-095-050245-
/O.NEW.KMPX.SV.W.0211.120705T0128Z-120705T0245Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN KANABEC COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHEASTERN MILLE LACS COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 945 PM CDT

* AT 825 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 11 MILES
  SOUTHWEST OF MOOSE LAKE TO 6 MILES NORTHEAST OF MCGRATH TO 7 MILES
  SOUTHWEST OF MALMO...AND MOVING SOUTHEAST AT 20 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  ISLE...
  WARMAN...

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.

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 4625 9342 4616 9342 4616 9306 4615 9304
      4608 9304 4605 9338 4624 9364 4626 9359
      4626 9344
TIME...MOT...LOC 0128Z 303DEG 18KT 4638 9295 4630 9317
          4628 9362
WIND...HAIL 60MPH 1.00IN

$$

CLF
1 follow-up statement
617 
WWUS53 KMPX 050212
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
912 PM CDT WED JUL 4 2012

MNC095-050227-
/O.CAN.KMPX.SV.W.0211.000000T0000Z-120705T0245Z/
MILLE LACS MN-
912 PM CDT WED JUL 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MILLE LACS COUNTY
IS CANCELLED...

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

LAT...LON 4616 9328 4616 9306 4615 9304 4608 9304
      4607 9320
TIME...MOT...LOC 0212Z 303DEG 18KT 4626 9268 4618 9290
          4616 9335

$$

MNC065-050245-
/O.CON.KMPX.SV.W.0211.000000T0000Z-120705T0245Z/
KANABEC MN-
912 PM CDT WED JUL 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
KANABEC COUNTY UNTIL 945 PM CDT...

AT 909 PM CDT...NATIONAL WEATHER SERVICE 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 BRUNO TO FINLAYSON TO ISLE...MOVING SOUTHEAST AT 20
MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHEASTERN KANABEC COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4616 9328 4616 9306 4615 9304 4608 9304
      4607 9320
TIME...MOT...LOC 0212Z 303DEG 18KT 4626 9268 4618 9290
          4616 9335
WIND...HAIL 60MPH 1.00IN

$$

CLF

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 8:13 PM CDTSpecial Weather StatementMPXKanabec62 min
Jul 4, 9:44 PM CDTTornado WarningMPXMorrison, Todd31 min
Jul 4, 10:15 PM CDTSevere Thunderstorm WarningMPXMorrison15 min
Jul 4, 10:17 PM CDTSpecial Weather StatementMPXMorrison28 min
Jul 4, 10:57 PM CDTSpecial Weather StatementMPXMille Lacs48 min
Jul 4, 11:46 PM CDTSpecial Weather StatementMPXMille Lacs29 min
Jul 5, 12:04 AM CDTSevere Thunderstorm WarningMPXKanabec, Mille Lacs41 min
Jul 5, 12:34 AM CDTSevere Thunderstorm WarningMPXChisago, Isanti, Kanabec, Mille Lacs41 min
Jul 5, 1:11 AM CDTSevere Thunderstorm WarningMPXChisago16 min
Jul 5, 3:25 AM CDTSpecial Weather StatementMPXWatonwan50 min
Jul 5, 4:03 AM CDTSpecial Weather StatementMPXWatonwan42 min
Jul 5, 5:07 AM CDTSpecial Weather StatementMPXWright38 min
Jul 5, 6:01 AM CDTSpecial Weather StatementMPXCarver44 min
Jul 5, 6:30 AM CDTSpecial Weather StatementMPXMcLeod30 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.