Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 64, NWS Sioux Falls, SD

May 11, 2011Nobles County, Rock County, Minnesota; Osceola County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 11, 2011, 7:27 PM CDT for Nobles County, Rock County, Minnesota; Osceola County, Iowa. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 11, 2011, 7:27 PM CDT (00:27 UTC)
Expired: May 11, 2011, 8:00 PM CDT
In force: 33 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Osceola County, IA, Nobles County, MN, Rock County, MN

The radar

The Sioux Falls radar (KFSD), 78 km from the middle of the area, began a volume at 00:27 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.5 hours before the alert went out and 218 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: 2051 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: -45 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.

176 
WUUS53 KFSD 120027
SVRFSD
IAC143-MNC105-133-120100-
/O.NEW.KFSD.SV.W.0064.110512T0027Z-110512T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
727 PM CDT WED MAY 11 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL OSCEOLA COUNTY IN NORTHWEST IOWA...
  NOBLES COUNTY IN SOUTHWEST MINNESOTA...
  NORTHEASTERN ROCK COUNTY IN SOUTHWEST MINNESOTA...

* UNTIL 800 PM CDT

* AT 726 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM 5 MILES EAST OF LUVERNE TO OCHEYEDAN...
  AND MOVING NORTHEAST AT 25 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  RUSHMORE AROUND 735 PM CDT...
  WORTHINGTON AROUND 745 PM CDT...
  LISMORE AROUND 750 PM CDT...
  WILMONT AROUND 755 PM CDT...
  BREWSTER AROUND 800 PM CDT...

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
KENNETH.

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.

LINES OF STORMS CAN OCCASSIONALY PRODUCE BRIEF TORNADOES IN ADDITION 
TO WIND DAMAGE. ALTHOUGH NOT IMMEDIATELY LIKELY...FOR YOUR 
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME 
OR BUSINESS. THIS STORM HAS THE POTENTIAL TO CAUSE SERIOUS INJURY 
AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

LAT...LON 4341 9559 4360 9612 4385 9607 4385 9604
      4375 9546 4363 9546
TIME...MOT...LOC 0026Z 222DEG 22KT 4365 9609 4348 9558
WIND...HAIL 60MPH <1.00IN

$$

LAFLIN

2 follow-up statements

122 
WWUS53 KFSD 120041
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
741 PM CDT WED MAY 11 2011

MNC133-120050-
/O.CAN.KFSD.SV.W.0064.000000T0000Z-110512T0100Z/
ROCK MN-
741 PM CDT WED MAY 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ROCK COUNTY IS
CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED AND 
MOVED OUT OF THE WARNED AREA.

LAT...LON 4343 9564 4347 9577 4352 9589 4381 9580
      4375 9546
TIME...MOT...LOC 0040Z 222DEG 22KT 4371 9601 4354 9550

$$

IAC143-MNC105-120100-
/O.CON.KFSD.SV.W.0064.000000T0000Z-110512T0100Z/
OSCEOLA IA-NOBLES MN-
741 PM CDT WED MAY 11 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN NOBLES
AND NORTH CENTRAL OSCEOLA COUNTIES UNTIL 800 PM CDT...

AT 740 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 6 MILES SOUTHWEST OF LISMORE TO ROUND LAKE...MOVING NORTHEAST AT
25 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  WORTHINGTON AROUND 750 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.

LINES OF STORMS CAN OCCASSIONALY PRODUCE BRIEF TORNADOES IN ADDITION 
TO WIND DAMAGE. ALTHOUGH NOT IMMEDIATELY LIKELY... FOR YOUR 
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME 
OR BUSINESS. THIS STORM HAS THE POTENTIAL TO CAUSE SERIOUS INJURY 
AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

LAT...LON 4343 9564 4347 9577 4352 9589 4381 9580
      4375 9546
TIME...MOT...LOC 0040Z 222DEG 22KT 4371 9601 4354 9550
WIND...HAIL 60MPH <1.00IN

$$

LAFLIN

075 
WWUS53 KFSD 120050
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
750 PM CDT WED MAY 11 2011

IAC143-MNC105-120101-
/O.EXP.KFSD.SV.W.0064.000000T0000Z-110512T0100Z/
OSCEOLA IA-NOBLES MN-
750 PM CDT WED MAY 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN NOBLES AND NORTH
CENTRAL OSCEOLA COUNTIES WILL EXPIRE AT 800 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY.

LAT...LON 4343 9564 4347 9577 4352 9589 4381 9580
      4375 9546
TIME...MOT...LOC 0051Z 222DEG 22KT 4376 9595 4359 9544

$$

LAFLIN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 7:07 PM CDT	Severe Thunderstorm Warning	FSD	Nobles, Rock	23 min
May 11, 7:14 PM CDT	Severe Thunderstorm Warning	FSD	Murray, Pipestone, Rock	31 min
May 12, 5:21 PM CDT	Severe Thunderstorm Warning	FSD	Ida, Woodbury	24 min
May 12, 5:45 PM CDT	Severe Thunderstorm Warning	FSD	Ida, Woodbury	45 min
May 12, 5:53 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	52 min
May 12, 6:28 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Ida, Woodbury	47 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011 Severe Thunderstorm Warnings in Iowa, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.