Alert archive / Iowa / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 69, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at May 12, 2011, 7:12 PM CDT for Ida County, Woodbury County, Iowa. It was in force for 28 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 12, 2011, 7:12 PM CDT (00:12 UTC)
- Expired
- May 12, 2011, 7:40 PM CDT
- In force
- 28 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 58.0 mph
Counties Ida County, IA, Woodbury County, IA
The radar
The Omaha radar (KOAX), 138 km from the middle of the area, began a volume at 00:15 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 12, 7:15 PM CDT | HAIL 0.5 | 5 N Ida Grove, IA | PEA TO MARBLE HAIL WHICH COVERED THE GROUND. |
| May 12, 7:15 PM CDT | HAIL 1 | 5 S Galva, IA |
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 12, 6:05 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.2 hours before the alert went out and 138 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.
- Mixed-layer CAPE
- 1648 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 900 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 50 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
170
WUUS53 KFSD 130012
SVRFSD
IAC093-193-130100-
/O.NEW.KFSD.SV.W.0069.110513T0012Z-110513T0100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
712 PM CDT THU MAY 12 2011
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
IDA COUNTY IN NORTHWEST IOWA...
SOUTHEASTERN WOODBURY COUNTY IN NORTHWEST IOWA...
* UNTIL 800 PM CDT
* AT 709 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING WALNUT SIZE
HAIL. THIS STORM WAS LOCATED 5 MILES NORTH OF DANBURY...OR 15
MILES WEST OF IDA GROVE...AND MOVING NORTHEAST AT 15 MPH. A SECOND
STORM WAS LOCATED 3 MILES NORTHEAST OF IDA GROVE...ALSO CAPABLE OF
PRODUCING WALNUT SIZED HAIL AND MOVING NORTHEAST AT 15 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
BATTLE CREEK AND CUSHING AROUND 730 PM CDT...
IDA GROVE AND HOLSTEIN AROUND 755 PM CDT...
ARTHUR AND GALVA AROUND 800 PM CDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS 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.
THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!
&&
LAT...LON 4239 9589 4249 9581 4257 9562 4256 9539
4249 9538 4248 9534 4247 9532 4229 9533
4221 9556 4220 9575
TIME...MOT...LOC 0009Z 247DEG 15KT 4232 9574
WIND...HAIL <58MPH 1.50IN
$$
LIEBL2 follow-up statements
861
WWUS53 KFSD 130033
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
733 PM CDT THU MAY 12 2011
IAC093-193-130100-
/O.CON.KFSD.SV.W.0069.000000T0000Z-110513T0100Z/
WOODBURY IA-IDA IA-
733 PM CDT THU MAY 12 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR IDA AND EAST
CENTRAL WOODBURY COUNTIES UNTIL 800 PM CDT...
AT 733 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
STORM WAS LOCATED NEAR CUSHING...OR 9 MILES NORTHWEST OF IDA GROVE...
MOVING NORTHEAST AT 20 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
HOLSTEIN AROUND 745 PM CDT...
GALVA AROUND 755 PM CDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!
&&
LAT...LON 4228 9566 4251 9576 4257 9562 4256 9539
4249 9538 4249 9536 4247 9532 4234 9533
4230 9557
TIME...MOT...LOC 0033Z 227DEG 16KT 4244 9560
WIND...HAIL <58MPH 1.00IN
$$
LIEBL424
WWUS53 KFSD 130040
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
740 PM CDT THU MAY 12 2011
IAC093-193-130050-
/O.CAN.KFSD.SV.W.0069.000000T0000Z-110513T0100Z/
WOODBURY IA-IDA IA-
740 PM CDT THU MAY 12 2011
...THE SEVERE THUNDERSTORM WARNING FOR IDA AND EAST CENTRAL WOODBURY
COUNTIES IS CANCELLED...
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 IS STILL POSSIBLE WITH THIS
THUNDERSTORM.
LAT...LON 4228 9566 4251 9576 4257 9562 4256 9539
4249 9538 4249 9536 4247 9532 4234 9533
4230 9557
TIME...MOT...LOC 0040Z 227DEG 16KT 4246 9557
$$
LIEBLThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 7:18 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 42 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2011Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.