Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 75, NWS Twin Cities, MN

May 19, 2012Chisago County, Isanti County, Minnesota; Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at May 19, 2012, 7:05 PM CDT for Chisago County, Isanti County, Minnesota; Polk County, Wisconsin. It was in force for 55 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 19, 2012, 7:05 PM CDT (00:05 UTC)
Expired
May 19, 2012, 8:00 PM CDT
In force
55 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Chisago County, MN, Isanti County, MN, Polk County, WI

The radar

The Minneapolis radar (KMPX), 96 km from the middle of the area, began a volume at 00:07 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, 0.1 hours before the alert went out and 97 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 2012-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1062 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 2012-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 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
1062 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
2089 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.6

Open this sounding in Storm Lab

The text

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

933 
WUUS53 KMPX 200005
SVRMPX
MNC025-059-WIC095-200100-
/O.NEW.KMPX.SV.W.0075.120520T0005Z-120520T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
705 PM CDT SAT MAY 19 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHISAGO COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHERN ISANTI COUNTY IN EAST CENTRAL MINNESOTA...
  WEST CENTRAL POLK COUNTY IN NORTHWEST WISCONSIN...

* UNTIL 800 PM CDT

* AT 703 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS OF 60 MPH. THIS
  STORM WAS LOCATED NEAR BODUM...OR ABOUT 7 MILES SOUTHEAST OF
  CAMBRIDGE...AND MOVING NORTHEAST AT 40 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  NORTH BRANCH...
  CENTER CITY...
  GRANDY...
  SHAFER...
  BRANCH...
  STANCHFIELD...
  HARRIS...
  BRAHAM...
  RUSH CITY...
  WOLF CREEK...

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 4573 9287 4565 9287 4564 9266 4537 9267
      4541 9301 4557 9302 4557 9350 4573 9325
TIME...MOT...LOC 0005Z 219DEG 35KT 4550 9313
WIND...HAIL 60MPH 1.00IN

$$
1 follow-up statement
838 
WWUS53 KMPX 200044
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
744 PM CDT SAT MAY 19 2012

MNC059-200059-
/O.CAN.KMPX.SV.W.0075.000000T0000Z-120520T0100Z/
ISANTI MN-
744 PM CDT SAT MAY 19 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ISANTI COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4558 9306 4573 9310 4573 9287 4565 9287
      4564 9266 4537 9267 4541 9301 4557 9302
TIME...MOT...LOC 0044Z 222DEG 34KT 4562 9270

$$

MNC025-WIC095-200100-
/O.CON.KMPX.SV.W.0075.000000T0000Z-120520T0100Z/
CHISAGO MN-POLK WI-
744 PM CDT SAT MAY 19 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WEST CENTRAL
POLK AND CHISAGO COUNTIES UNTIL 800 PM CDT...

AT 739 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS OF 60 MPH.  THIS
STORM WAS LOCATED NEAR WOLF CREEK...OR 12 MILES NORTHEAST OF NORTH
BRANCH...MOVING NORTHEAST AT 40 MPH. NICKEL SIZE HAIL MAY ALSO
ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHWESTERN POLK 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 4558 9306 4573 9310 4573 9287 4565 9287
      4564 9266 4537 9267 4541 9301 4557 9302
TIME...MOT...LOC 0044Z 222DEG 34KT 4562 9270
WIND...HAIL 60MPH 0.88IN

$$

RAH

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 7:05 PM CDTSevere Thunderstorm WarningMPXDakota, Hennepin, Rice, Scott40 min
May 19, 7:31 PM CDTSevere Thunderstorm WarningMPXAnoka, Chisago, Dakota, Hennepin, Ramsey, Washington59 min
May 19, 7:51 PM CDTSevere Thunderstorm WarningMPXDakota, Hennepin, Scott38 min
May 19, 8:06 PM CDTAreal Flood AdvisoryMPXDakota, Hennepin, Ramsey, Scott3 hr
May 19, 8:52 PM CDTSpecial Weather StatementMPXBrown, Nicollet, Sibley, Watonwan38 min
May 20, 1:10 AM CDTSpecial Weather StatementMPXBenton, Mille Lacs50 min
May 20, 1:43 AM CDTSpecial Weather StatementMPXAnoka, Chisago, Isanti, Ramsey, Washington47 min
May 19, 7:42 PM CDTSevere Thunderstorm WarningMPXPolk, Saint Croix63 min
May 20, 12:38 PM CDTSpecial Weather StatementMPXEau Claire52 min

Nearby

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