Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 178, NWS Sioux Falls, SD

August 1, 2012Lyon County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 1, 2012, 5:08 PM CDT for Lyon County, Minnesota. It was in force for 37 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, 5:08 PM CDT (22:08 UTC)
Expired: Aug 1, 2012, 5:45 PM CDT
In force: 37 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Lyon County, MN

The radar

The Sioux Falls radar (KFSD), 133 km from the middle of the area, began a volume at 22:10 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, 5:29 PM CDT	HAIL 1.75	3 Ne Taunton, MN
Aug 1, 5:35 PM CDT	HAIL 1.75	Minneota, 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, 10.1 hours before the alert went out and 177 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.

328 
WUUS53 KFSD 012208
SVRFSD
MNC083-012245-
/O.NEW.KFSD.SV.W.0178.120801T2208Z-120801T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
508 PM CDT WED AUG 1 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN LYON COUNTY IN SOUTHWEST MINNESOTA...

* UNTIL 545 PM CDT

* AT 508 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR TAUNTON...OR 20 MILES NORTHWEST OF MARSHALL...AND
  MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  TAUNTON AROUND 515 PM CDT...
  MINNEOTA AROUND 525 PM CDT...
  COTTONWOOD 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.

&&

LAT...LON 4462 9560 4450 9561 4453 9608 4455 9610
      4464 9609 4463 9561
TIME...MOT...LOC 2208Z 287DEG 19KT 4465 9609
WIND...HAIL 60MPH 1.00IN

$$

CJ

2 follow-up statements

345 
WWUS53 KFSD 012223
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
523 PM CDT WED AUG 1 2012

MNC083-012245-
/O.CON.KFSD.SV.W.0178.000000T0000Z-120801T2245Z/
LYON MN-
523 PM CDT WED AUG 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN LYON
COUNTY UNTIL 545 PM CDT...

AT 523 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING WALNUT SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
TAUNTON...OR 15 MILES NORTHWEST OF MARSHALL...MOVING SOUTHEAST AT 30
MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  COTTONWOOD 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.

&&

LAT...LON 4462 9560 4450 9561 4453 9608 4455 9610
      4464 9609 4463 9561
TIME...MOT...LOC 2223Z 293DEG 25KT 4460 9597
WIND...HAIL 60MPH 1.50IN

$$

CJ

638 
WWUS53 KFSD 012233
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
533 PM CDT WED AUG 1 2012

MNC083-012245-
/O.CON.KFSD.SV.W.0178.000000T0000Z-120801T2245Z/
LYON MN-
533 PM CDT WED AUG 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN LYON
COUNTY UNTIL 545 PM CDT...

AT 532 PM CDT...A SEVERE THUNDERSTORM WAS REPORTED...PRODUCING  GOLF
BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM
WAS LOCATED NEAR MINNEOTA...OR 11 MILES NORTHWEST OF MARSHALL...
MOVING SOUTHEAST AT 30 MPH.

IN ADDITION...AT 529 PM CDT...GOLF BALL SIZE HAIL WAS REPORTED 2 
MILES NORTHEAST OF TAUNTON WITH THIS STORM.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  COTTONWOOD 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.

&&

LAT...LON 4462 9560 4450 9561 4453 9608 4455 9610
      4464 9609 4463 9561
TIME...MOT...LOC 2232Z 293DEG 25KT 4457 9589
WIND...HAIL 60MPH 1.75IN

$$

CJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 5:13 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	47 min
Aug 1, 5:40 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Lyon	50 min
Aug 1, 6:23 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	26 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.