Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 27, NWS Twin Cities, MN

May 2, 2012Brown County, Redwood County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 2, 2012, 6:45 PM CDT for Brown County, Redwood County, Minnesota. It was in force for 60 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, 6:45 PM CDT (23:45 UTC)
Expired: May 2, 2012, 7:45 PM CDT
In force: 60 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Brown County, MN, Redwood County, MN

The radar

The Minneapolis radar (KMPX), 115 km from the middle of the area, began a volume at 23:47 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, 6:45 PM CDT	HAIL 1	2 S Springfield, MN
May 2, 7:00 PM CDT	HAIL 0.88	3 S Cobden, MN

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 2, 5:25 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.8 hours before the alert went out and 113 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.

622 
WUUS53 KMPX 022345 RRA
SVRMPX
MNC015-127-030045-
/O.NEW.KMPX.SV.W.0027.120502T2345Z-120503T0045Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BROWN COUNTY IN SOUTH CENTRAL MINNESOTA...
  SOUTHEASTERN REDWOOD COUNTY IN SOUTHWEST MINNESOTA...

* UNTIL 745 PM CDT

* AT 642 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR
  SPRINGFIELD...OR ABOUT 22 MILES NORTH OF WINDOM...AND MOVING
  NORTHEAST AT 25 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  SANBORN...
  SPRINGFIELD...
  CLEMENTS...
  MORGAN...
  EVAN...
  SLEEPY EYE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 4420 9515 4454 9497 4441 9469 4442 9468
      4439 9467 4439 9465 4429 9443 4410 9500
TIME...MOT...LOC 2346Z 235DEG 20KT 4419 9497
WIND...HAIL <50MPH 1.00IN

$$

2 follow-up statements

620 
WWUS53 KMPX 022355
SVSMPX

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

MNC015-127-030045-
/O.CON.KMPX.SV.W.0027.000000T0000Z-120503T0045Z/
BROWN MN-REDWOOD MN-
655 PM CDT WED MAY 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
REDWOOD AND BROWN COUNTIES UNTIL 745 PM CDT...

AT 651 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL.  THIS STORM
WAS LOCATED NEAR SPRINGFIELD...OR 21 MILES NORTHWEST OF ST JAMES...
MOVING NORTHEAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  MORGAN...EVAN...SLEEPY EYE AND COBDEN.

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.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 4413 9490 4430 9509 4453 9497 4441 9470
      4442 9468 4439 9466 4439 9465 4429 9443
TIME...MOT...LOC 2355Z 235DEG 20KT 4422 9489
WIND...HAIL <50MPH 1.25IN

$$

695 
WWUS53 KMPX 030014
SVSMPX

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

MNC127-030029-
/O.CAN.KMPX.SV.W.0027.000000T0000Z-120503T0045Z/
REDWOOD MN-
714 PM CDT WED MAY 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL REDWOOD COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED ACROSS THE WARNED 
AREA.

LAT...LON 4428 9486 4443 9475 4441 9471 4439 9467
      4439 9465 4429 9443 4415 9485
TIME...MOT...LOC 0014Z 252DEG 17KT 4425 9473

$$

MNC015-030045-
/O.CON.KMPX.SV.W.0027.000000T0000Z-120503T0045Z/
BROWN MN-
714 PM CDT WED MAY 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN BROWN
COUNTY UNTIL 745 PM CDT...

AT 710 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS
LOCATED NEAR SLEEPY EYE...OR 15 MILES WEST OF NEW ULM...MOVING EAST
AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
  SLEEPY EYE.

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.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 4428 9486 4443 9475 4441 9471 4439 9467
      4439 9465 4429 9443 4415 9485
TIME...MOT...LOC 0014Z 252DEG 17KT 4425 9473
WIND...HAIL <50MPH 1.00IN

$$

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, 5:22 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Watonwan	53 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, 6:58 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.