Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 221, NWS Sioux Falls, SD

September 4, 2012Jackson County, Nobles County, Minnesota; 4 counties in Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 4, 2012, 10:28 PM CDT for Jackson County, Nobles County, Minnesota; 4 counties in Iowa. It was in force for 47 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: Sep 4, 2012, 10:28 PM CDT (03:28 UTC)
Expired: Sep 4, 2012, 11:15 PM CDT
In force: 47 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clay County, IA, Dickinson County, IA, O'Brien County, IA, Osceola County, IA, Jackson County, MN, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 134 km from the middle of the area, began a volume at 03:30 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 watch it was issued in

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

Issued	Product	Office	Lasted
Sep 4, 7:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.5 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: 3109 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 63 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.

349 
WUUS53 KFSD 050328
SVRFSD
IAC041-059-141-143-MNC063-105-050415-
/O.NEW.KFSD.SV.W.0221.120905T0328Z-120905T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1028 PM CDT TUE SEP 4 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLAY COUNTY IN NORTHWEST IOWA...
  DICKINSON COUNTY IN NORTHWEST IOWA...
  EASTERN O'BRIEN COUNTY IN NORTHWEST IOWA...
  EASTERN OSCEOLA COUNTY IN NORTHWEST IOWA...
  SOUTHERN JACKSON COUNTY IN SOUTHWEST MINNESOTA...
  SOUTHEASTERN NOBLES COUNTY IN SOUTHWEST MINNESOTA...

* UNTIL 1115 PM CDT

* AT 1027 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
  QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE
  STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 7 MILES SOUTHEAST
  OF JACKSON TO 7 MILES NORTHEAST OF WEBB...AND MOVING EAST AT 45   
  MPH. STRONG WINDS ARE ALSO BEING REPORTED BEHIND THE HEAVIEST RAIN
  AS WELL AS AHEAD OF IT IN THE OUTFLOW. 

* SEVERE THUNDERSTORMS WILL AFFECT MAINLY RURAL AREAS OF CLAY...
  DICKINSON...EASTERN O'BRIEN...EASTERN OSCEOLA...SOUTHEASTERN NOBLES
  AND SOUTHERN JACKSON COUNTIES.

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 4349 9490 4293 9491 4292 9563 4361 9560
      4362 9485 4351 9485
TIME...MOT...LOC 0327Z 271DEG 41KT 4354 9492 4304 9493
WIND...HAIL 60MPH 1.00IN

$$

CHENARD

2 follow-up statements

462 
WWUS53 KFSD 050352
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1052 PM CDT TUE SEP 4 2012

MNC105-050402-
/O.CAN.KFSD.SV.W.0221.000000T0000Z-120905T0415Z/
NOBLES MN-
1052 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN NOBLES COUNTY IS
CANCELLED...

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

LAT...LON 4349 9490 4293 9491 4293 9545 4361 9545
      4362 9485 4351 9485
TIME...MOT...LOC 0352Z 271DEG 41KT 4357 9486 4295 9496

$$

IAC041-059-141-143-MNC063-050415-
/O.CON.KFSD.SV.W.0221.000000T0000Z-120905T0415Z/
OSCEOLA IA-O'BRIEN IA-DICKINSON IA-CLAY IA-JACKSON MN-
1052 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
JACKSON...CLAY...DICKINSON...EASTERN O'BRIEN AND EASTERN OSCEOLA
COUNTIES UNTIL 1115 PM CDT...

AT 1052 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
TRACKING A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES SOUTHEAST OF JACKSON
TO WEBB...MOVING EAST AT 45 MPH.

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 4349 9490 4293 9491 4293 9545 4361 9545
      4362 9485 4351 9485
TIME...MOT...LOC 0352Z 271DEG 41KT 4357 9486 4295 9496
WIND...HAIL 60MPH 1.00IN

$$

MJF

088 
WWUS53 KFSD 050412
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1112 PM CDT TUE SEP 4 2012

IAC041-059-141-143-MNC063-050423-
/O.EXP.KFSD.SV.W.0221.000000T0000Z-120905T0415Z/
OSCEOLA IA-O'BRIEN IA-DICKINSON IA-CLAY IA-JACKSON MN-
1112 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN JACKSON...CLAY...
DICKINSON...EASTERN O'BRIEN AND EASTERN OSCEOLA COUNTIES WILL EXPIRE
AT 1115 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 4349 9490 4293 9491 4293 9545 4361 9545
      4362 9485 4351 9485
TIME...MOT...LOC 0413Z 271DEG 41KT 4356 9453 4294 9464

$$

MJF

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 8:52 PM CDT	Severe Thunderstorm Warning	FSD	Pipestone, Rock	38 min
Sep 4, 9:28 PM CDT	Severe Thunderstorm Warning	FSD	Murray, Nobles, Pipestone, Rock	47 min
Sep 4, 9:32 PM CDT	Severe Thunderstorm Warning	FSD	Jackson, Nobles	58 min
Sep 4, 10:04 PM CDT	Severe Thunderstorm Warning	FSD	Cottonwood, Jackson, Murray, Nobles	56 min
Sep 4, 8:14 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Sioux	46 min
Sep 4, 8:55 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, O'Brien, Osceola, Sioux	50 min
Sep 4, 8:57 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Plymouth, Sioux, Woodbury	48 min
Sep 4, 9:44 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Cherokee, Clay, Ida, O'Brien, Plymouth and 1 more	61 min
Sep 4, 10:15 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Sioux	45 min
Sep 4, 10:45 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, O'Brien, Plymouth, Sioux	45 min
Sep 4, 11:27 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Cherokee, Ida, Plymouth, Woodbury	48 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2012 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.