Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 2, NWS Sioux Falls, SD

March 30, 2012Woodbury County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Mar 30, 2012, 5:01 PM CDT for Woodbury County, Iowa. It was in force for 29 min. 4 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: Mar 30, 2012, 5:01 PM CDT (22:01 UTC)
Expired: Mar 30, 2012, 5:30 PM CDT
In force: 29 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Woodbury County, IA

The radar

The Omaha radar (KOAX), 113 km from the middle of the area, began a volume at 22:03 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
Mar 30, 5:03 PM CDT	HAIL 1.25	4 Ne Salix, IA	QUARTER TO HALF DOLLAR HAIL FROM 2W TO 2E OF LUTON
Mar 30, 5:15 PM CDT	HAIL 0.75	3 N Hornick, IA	HAIL AT 515 PM FOLLOWED BY BRIEF HEAVY RAIN, AND THEN A BIG RAINBOW BY 522 PM.
Mar 30, 5:15 PM CDT	HAIL 1	4 Nne Hornick, IA	40 MPH EAST WIND ABOUT 5 MINUTES PRIOR TO HAIL. QUARTER SIZE HAIL WAS SOFT AND BROKE WHEN IT HIT THE GROUND.
Mar 30, 5:15 PM CDT	HAIL 1	5 Nne Hornick, IA	NICKEL TO QUARTER SIZE HAIL

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.0 hours before the alert went out and 113 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: 1139 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -100 m²/s²
0-3 km storm-relative helicity: -119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

164 
WUUS53 KFSD 302201
SVRFSD
IAC193-302230-
/O.NEW.KFSD.SV.W.0002.120330T2201Z-120330T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
501 PM CDT FRI MAR 30 2012

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN WOODBURY COUNTY IN WEST CENTRAL IOWA...

* UNTIL 530 PM CDT

* AT 501 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 6 MILES NORTHEAST OF SALIX...OR 15 MILES SOUTHEAST OF SIOUX
  CITY...AND MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ANTHON AND SMITHLAND AROUND 525 PM CDT...
  DANBURY AROUND 530 PM CDT...

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE OTO.

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 4227 9628 4244 9624 4240 9568 4221 9572
      4220 9586
TIME...MOT...LOC 2201Z 279DEG 26KT 4234 9614
WIND...HAIL 60MPH 1.00IN

$$

WILLIAMS

2 follow-up statements

037 
WWUS53 KFSD 302216
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
516 PM CDT FRI MAR 30 2012

IAC193-302230-
/O.CON.KFSD.SV.W.0002.000000T0000Z-120330T2230Z/
WOODBURY IA-
516 PM CDT FRI MAR 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WOODBURY COUNTY UNTIL 530 PM CDT...

AT 516 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 6 MILES
NORTHEAST OF HORNICK...OR 23 MILES SOUTHEAST OF SIOUX CITY...MOVING
EAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  SMITHLAND AROUND 525 PM CDT...
  DANBURY AROUND 530 PM CDT...

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE OTO.

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 4225 9617 4239 9614 4235 9569 4221 9572
      4220 9586
TIME...MOT...LOC 2216Z 290DEG 25KT 4230 9601
WIND...HAIL 60MPH 1.00IN

$$

WILLIAMS

269 
WWUS53 KFSD 302230
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
530 PM CDT FRI MAR 30 2012

IAC193-302240-
/O.EXP.KFSD.SV.W.0002.000000T0000Z-120330T2230Z/
WOODBURY IA-
530 PM CDT FRI MAR 30 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WOODBURY COUNTY
HAS EXPIRED...

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 HEAVY RAIN ARE STILL POSSIBLE WITH 
THIS THUNDERSTORM IN FAR SOUTHEAST WOODBURY COUNTY.

LAT...LON 4225 9617 4239 9614 4235 9569 4221 9572
      4220 9586
TIME...MOT...LOC 2230Z 290DEG 25KT 4227 9589

$$

WILLIAMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 30, 4:42 AM CDT	Dense Fog Advisory	FSD	Cherokee, Lyon, O'Brien, Osceola, Plymouth, Sioux	7 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 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.