Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 16, NWS Sioux Falls, SD

May 1, 2012Lyon County, Murray County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 1, 2012, 5:19 PM CDT for Lyon County, Murray County, Minnesota. It was in force for 26 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 1, 2012, 5:19 PM CDT (22:19 UTC)
Expired: May 1, 2012, 5:45 PM CDT
In force: 26 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 58.0 mph

Counties Lyon County, MN, Murray County, MN

The radar

The Sioux Falls radar (KFSD), 86 km from the middle of the area, began a volume at 22:21 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 1, 5:28 PM CDT	HAIL 1.25	4 Wsw Current Lake, MN
May 1, 5:33 PM CDT	HAIL 1	2 Wnw Current Lake, 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 1, 2:59 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.3 hours before the alert went out and 203 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1291 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 196 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.

062 
WUUS53 KFSD 012219
SVRFSD
MNC083-101-012245-
/O.NEW.KFSD.SV.W.0016.120501T2219Z-120501T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
519 PM CDT TUE MAY 1 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL LYON COUNTY IN SOUTHWEST MINNESOTA...
  NORTHWESTERN MURRAY COUNTY IN SOUTHWEST MINNESOTA...

* UNTIL 545 PM CDT

* AT 519 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
  HAIL.  THIS STORM WAS LOCATED 5 MILES NORTH OF WOODSTOCK...OR 14
  MILES NORTHEAST OF PIPESTONE...AND MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CURRENT LAKE AROUND 535 PM CDT...
  BALATON AROUND 545 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT TUESDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND SOUTHEASTERN SOUTH
DAKOTA.

LAT...LON 4408 9581 4402 9606 4408 9607 4419 9606
      4426 9586
TIME...MOT...LOC 2219Z 238DEG 24KT 4409 9605
WIND...HAIL <58MPH 1.00IN

$$

CJ

2 follow-up statements

951 
WWUS53 KFSD 012233
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
533 PM CDT TUE MAY 1 2012

MNC083-101-012245-
/O.CON.KFSD.SV.W.0016.000000T0000Z-120501T2245Z/
LYON MN-MURRAY MN-
533 PM CDT TUE MAY 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
MURRAY AND SOUTH CENTRAL LYON COUNTIES UNTIL 545 PM CDT...

AT 532 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL. 
THIS STORM WAS LOCATED NEAR CURRENT LAKE...OR 15 MILES NORTHWEST OF
SLAYTON...MOVING NORTHEAST AT 20 MPH.

IN ADDITION...AT 528 PM CDT HALF DOALLR SIZE HAIL WAS REPORTED 4 
MILES SOUTHWEST OF CURRENT LAKE WITH THIS STORM.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  CURRENT LAKE AROUND 540 PM CDT...
  BALATON AROUND 545 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4408 9581 4402 9606 4408 9607 4419 9606
      4426 9586
TIME...MOT...LOC 2232Z 231DEG 18KT 4412 9600
WIND...HAIL <58MPH 1.25IN

$$

CJ

628 
WWUS53 KFSD 012244
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
544 PM CDT TUE MAY 1 2012

MNC083-101-012254-
/O.EXP.KFSD.SV.W.0016.000000T0000Z-120501T2245Z/
LYON MN-MURRAY MN-
544 PM CDT TUE MAY 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MURRAY AND SOUTH
CENTRAL LYON COUNTIES WILL EXPIRE AT 545 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY...HOWEVER SMALL HAIL AND GUSTY WINDS ARE STILL POSSIBLE WITH
THIS THUNDERSTORM.

LAT...LON 4408 9581 4402 9606 4408 9607 4419 9606
      4426 9586
TIME...MOT...LOC 2244Z 231DEG 18KT 4416 9593

$$

CJ

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 1, 4:31 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Lyon, Murray, Pipestone	29 min
May 1, 4:57 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	33 min
May 1, 5:16 PM CDT	Severe Thunderstorm Warning	FSD	Pipestone	29 min
May 1, 6:56 PM CDT	Severe Thunderstorm Warning	FSD	Cottonwood, Murray	34 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.