Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 24, NWS Twin Cities, MN

May 2, 2012Blue Earth County, Brown County, Watonwan County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 2, 2012, 5:22 PM CDT for Blue Earth County, Brown County, Watonwan County, Minnesota. It was in force for 53 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 2, 2012, 5:22 PM CDT (22:22 UTC)
Expired: May 2, 2012, 6:15 PM CDT
In force: 53 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Blue Earth County, MN, Brown County, MN, Watonwan County, MN

The radar

The Minneapolis radar (KMPX), 113 km from the middle of the area, began a volume at 22:24 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.

What was reported inside it

Time	Report	Where	Remark
May 2, 5:39 PM CDT	HAIL 0.88	S Hanska, MN
May 2, 5:40 PM CDT	HAIL 1	S Hanska, MN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.4 hours before the alert went out and 111 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: 4 J/kg
Mixed-layer CIN: -280 J/kg
Mixed-layer LCL: 847 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 144 m²/s²
0-3 km storm-relative helicity: 109 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.

841 
WUUS53 KMPX 022222
SVRMPX
MNC013-015-165-022315-
/O.NEW.KMPX.SV.W.0024.120502T2222Z-120502T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
522 PM CDT WED MAY 2 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHWESTERN BLUE EARTH COUNTY IN SOUTH CENTRAL
  MINNESOTA...
  EASTERN BROWN COUNTY IN SOUTH CENTRAL MINNESOTA...
  NORTH CENTRAL WATONWAN COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 615 PM CDT

* AT 518 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS OF 60 MPH. THIS
  STORM WAS LOCATED NEAR LA SALLE...OR ABOUT 8 MILES NORTH OF ST
  JAMES...AND MOVING NORTHEAST AT 20 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  LA SALLE...
  HANSKA...

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 4411 9480 4436 9456 4421 9429 4402 9463
TIME...MOT...LOC 2222Z 227DEG 16KT 4411 9461
WIND...HAIL 60MPH 1.00IN

$$

2 follow-up statements

855 
WWUS53 KMPX 022258
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
558 PM CDT WED MAY 2 2012

MNC165-022313-
/O.CAN.KMPX.SV.W.0024.000000T0000Z-120502T2315Z/
WATONWAN MN-
558 PM CDT WED MAY 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL WATONWAN COUNTY
IS CANCELLED...

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

LAT...LON 4411 9480 4436 9456 4421 9429 4411 9446
TIME...MOT...LOC 2258Z 227DEG 16KT 4422 9445

$$

MNC013-015-022315-
/O.CON.KMPX.SV.W.0024.000000T0000Z-120502T2315Z/
BROWN MN-BLUE EARTH MN-
558 PM CDT WED MAY 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EXTREME
NORTHWESTERN BLUE EARTH AND EASTERN BROWN COUNTIES UNTIL 615 PM
CDT...

AT 556 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS OF 60 MPH.  THIS STORM WAS LOCATED NEAR HANSKA...OR 7 MILES
SOUTH OF NEW ULM...MOVING NORTHEAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EASTERN BROWN AND EXTREME NORTHWESTERN BLUE
  EARTH COUNTIES.

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 4411 9480 4436 9456 4421 9429 4411 9446
TIME...MOT...LOC 2258Z 227DEG 16KT 4422 9445
WIND...HAIL 60MPH 1.00IN

$$

770 
WWUS53 KMPX 022307
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
607 PM CDT WED MAY 2 2012

MNC013-015-022323-
/O.EXP.KMPX.SV.W.0024.000000T0000Z-120502T2315Z/
BROWN MN-BLUE EARTH MN-
607 PM CDT WED MAY 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME NORTHWESTERN BLUE
EARTH AND EASTERN BROWN COUNTIES WILL EXPIRE AT 615 PM CDT...

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

LAT...LON 4411 9480 4436 9456 4421 9429 4411 9446
TIME...MOT...LOC 2308Z 227DEG 16KT 4425 9440

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 1, 7:08 PM CDT	Severe Thunderstorm Warning	MPX	Sherburne, Stearns, Wright	52 min
May 1, 7:23 PM CDT	Special Weather Statement	MPX	Isanti, Kanabec	52 min
May 1, 7:24 PM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod, Sibley	51 min
May 1, 7:30 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Isanti, Kanabec	45 min
May 1, 7:55 PM CDT	Special Weather Statement	MPX	Anoka	50 min
May 1, 8:08 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Chisago, Isanti	37 min
May 1, 8:09 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Nicollet, Sibley	66 min
May 1, 8:13 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood	25 min
May 1, 9:24 PM CDT	Special Weather Statement	MPX	Nicollet, Sibley	51 min
May 1, 10:11 PM CDT	Special Weather Statement	MPX	Blue Earth, Faribault, Le Sueur, Martin, Nicollet	49 min
May 1, 11:12 PM CDT	Special Weather Statement	MPX	Freeborn, Rice, Steele, Waseca	48 min
May 2, 5:50 PM CDT	Tornado Warning	MPX	Blue Earth, Brown, Nicollet, Watonwan	40 min
May 2, 6:20 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Le Sueur, Nicollet, Waseca	55 min
May 2, 6:45 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue, Rice, Steele	60 min
May 2, 6:45 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood	60 min
May 2, 6:58 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice, Steele, Waseca	47 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.