Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 237, NWS Twin Cities, MN

August 1, 2012Yellow Medicine County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 1, 2012, 4:59 PM CDT for Yellow Medicine County, Minnesota. It was in force for 46 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: Aug 1, 2012, 4:59 PM CDT (21:59 UTC)
Expired: Aug 1, 2012, 5:45 PM CDT
In force: 46 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 65.0 mph

County Yellow Medicine County, MN

The radar

The Sioux Falls radar (KFSD), 139 km from the middle of the area, began a volume at 22:01 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
Aug 1, 5:17 PM CDT	HAIL 1.75	4 Ne Porter, MN
Aug 1, 5:29 PM CDT	HAIL 1.75	3 Ne Taunton, 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, 10.0 hours before the alert went out and 180 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: 670 J/kg
Mixed-layer CIN: -340 J/kg
Mixed-layer LCL: 1367 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 246 m²/s²
0-3 km storm-relative helicity: 292 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

891 
WUUS53 KMPX 012159
SVRMPX
MNC173-012245-
/O.NEW.KMPX.SV.W.0237.120801T2159Z-120801T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
459 PM CDT WED AUG 1 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL YELLOW MEDICINE COUNTY IN WEST CENTRAL MINNESOTA...

* UNTIL 545 PM CDT

* AT 458 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS OF 65 MPH. THIS
  STORM WAS LOCATED NEAR ST LEO...OR ABOUT 22 MILES NORTHWEST OF
  MARSHALL...AND MOVING EAST AT 25 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  ST LEO...
  SPRING CREEK...
  CLARKFIELD...
  HAZEL RUN...
  HANLEY FALLS...
  WOOD LAKE...

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 4479 9619 4481 9552 4454 9548 4456 9561
      4462 9562 4462 9611 4463 9621
TIME...MOT...LOC 2159Z 276DEG 23KT 4469 9607
WIND...HAIL 65MPH 1.00IN

$$

JLT

5 follow-up statements

082 
WWUS53 KMPX 012207
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
507 PM CDT WED AUG 1 2012

MNC173-012245-
/O.CON.KMPX.SV.W.0237.000000T0000Z-120801T2245Z/
YELLOW MEDICINE MN-
507 PM CDT WED AUG 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL YELLOW
MEDICINE COUNTY UNTIL 545 PM CDT...

AT 502 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS OF 65 MPH.  THIS STORM WAS LOCATED NEAR ST LEO...OR 22 MILES
SOUTH OF MADISON...MOVING EAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  SPRING CREEK...CLARKFIELD...HAZEL RUN...HANLEY FALLS AND WOOD LAKE.

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 4479 9619 4481 9552 4454 9548 4456 9561
      4462 9562 4462 9611 4463 9621
TIME...MOT...LOC 2207Z 285DEG 24KT 4470 9605
WIND...HAIL 60MPH 1.00IN

$$

JLT

244 
WWUS53 KMPX 012213
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
513 PM CDT WED AUG 1 2012

MNC173-012245-
/O.CON.KMPX.SV.W.0237.000000T0000Z-120801T2245Z/
YELLOW MEDICINE MN-
513 PM CDT WED AUG 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL YELLOW
MEDICINE COUNTY UNTIL 545 PM CDT...

AT 512 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING
WINDS OF 65 MPH.  THIS STORM WAS LOCATED NEAR ST LEO...OR 20 MILES
NORTHWEST OF MARSHALL...MOVING EAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  SPRING CREEK...CLARKFIELD...HAZEL RUN...HANLEY FALLS AND WOOD LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH CAN UPROOT TREES AND DOWN POWER LINES. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4479 9619 4481 9552 4454 9548 4456 9561
      4462 9562 4462 9611 4463 9621
TIME...MOT...LOC 2213Z 287DEG 22KT 4468 9603
WIND...HAIL 60MPH 1.75IN

$$

JLT

495 
WWUS53 KMPX 012219
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
519 PM CDT WED AUG 1 2012

MNC173-012245-
/O.CON.KMPX.SV.W.0237.000000T0000Z-120801T2245Z/
YELLOW MEDICINE MN-
519 PM CDT WED AUG 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL YELLOW
MEDICINE COUNTY UNTIL 545 PM CDT...

AT 516 PM CDT...A TRAINED WEATHER SPOTTER REPORTED GOLF BALL SIZE 
HAIL BETWEEN ST LEO AND PORTER. THIS STORM WAS MOVING SOUTHEAST AT 
20 MPH. 

LOCATIONS IMPACTED INCLUDE...
  CLARKFIELD...SPRING CREEK...HAZEL RUN...HANLEY FALLS AND WOOD LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH CAN UPROOT TREES AND DOWN POWER LINES. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

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

&&

LAT...LON 4479 9619 4481 9552 4454 9548 4456 9561
      4462 9562 4462 9611 4463 9621
TIME...MOT...LOC 2218Z 298DEG 18KT 4467 9604
WIND...HAIL 60MPH 1.75IN

$$

JLT

756 
WWUS53 KMPX 012232
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
532 PM CDT WED AUG 1 2012

MNC173-012245-
/O.CON.KMPX.SV.W.0237.000000T0000Z-120801T2245Z/
YELLOW MEDICINE MN-
532 PM CDT WED AUG 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL YELLOW
MEDICINE COUNTY UNTIL 545 PM CDT...

AT 530 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 5 MILES NORTH OF MINNEOTA...
OR 16 MILES NORTHWEST OF MARSHALL...MOVING SOUTHEAST AT 20 MPH.

IN ADDITION...GOLF BALL SIZE HAIL OCCURRED BETWEEN ST LEO AND PORTER 
AROUND 515 PM WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  CLARKFIELD...SPRING CREEK...HAZEL RUN...HANLEY FALLS AND WOOD LAKE.

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 4479 9619 4481 9552 4454 9548 4456 9561
      4462 9562 4462 9611 4463 9621
TIME...MOT...LOC 2232Z 298DEG 18KT 4464 9596
WIND...HAIL 60MPH 1.00IN

$$

JLT

455 
WWUS53 KMPX 012241
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
541 PM CDT WED AUG 1 2012

MNC173-012256-
/O.EXP.KMPX.SV.W.0237.000000T0000Z-120801T2245Z/
YELLOW MEDICINE MN-
541 PM CDT WED AUG 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL YELLOW MEDICINE COUNTY
WILL EXPIRE AT 545 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA...HOWEVER SMALL HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1 AM. 

LAT...LON 4479 9619 4481 9552 4454 9548 4456 9561
      4462 9562 4462 9611 4463 9621
TIME...MOT...LOC 2241Z 298DEG 18KT 4462 9590

$$

JLT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 10:10 AM CDT	Special Weather Statement	MPX	Sherburne	50 min
Aug 1, 4:44 PM CDT	Special Weather Statement	MPX	Yellow Medicine	61 min
Aug 1, 6:02 PM CDT	Severe Thunderstorm Warning	MPX	Redwood, Renville, Yellow Medicine	58 min
Aug 1, 6:47 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Nicollet, Redwood, Renville, Sibley	58 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.