Alert archive / Iowa / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 129, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at May 27, 2012, 7:11 PM CDT for Plymouth County, Sioux County, Iowa; Lincoln County, Union County, South Dakota. It was in force for 34 min. 5 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 27, 2012, 7:11 PM CDT (00:11 UTC)
- Expired
- May 27, 2012, 7:45 PM CDT
- In force
- 34 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Plymouth County, IA, Sioux County, IA, Lincoln County, SD, Union County, SD
The radar
The Sioux Falls radar (KFSD), 73 km from the middle of the area, began a volume at 00:12 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 27, 7:15 PM CDT | TSTM WND DMG | 6 Nw Akron, SD | HALF OF MAPLE TREE GONE |
| May 27, 7:15 PM CDT | TSTM WND DMG | Akron, IA | TREE DOWN ACROSS HIGHWAY 12 CAUSING ROAD CLOSURE |
| May 27, 7:15 PM CDT | HAIL 1.5 | 6 Nw Akron, SD | |
| May 27, 7:25 PM CDT | TSTM WND DMG | 7 S Alcester, SD | MULTIPLE TREES AND TREE BRANCHES DOWN |
| May 27, 7:28 PM CDT | TSTM WND GST 60 | Ne Hawarden, IA | TREES DOWN IN HAWARDEN |
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 27, 3:42 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.2 hours before the alert went out and 181 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
- 849 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 2094 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
446
WUUS53 KFSD 280011
SVRFSD
IAC149-167-SDC083-127-280045-
/O.NEW.KFSD.SV.W.0129.120528T0011Z-120528T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
711 PM CDT SUN MAY 27 2012
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
WESTERN PLYMOUTH COUNTY IN NORTHWEST IOWA...
WESTERN SIOUX COUNTY IN NORTHWEST IOWA...
EASTERN LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA...
UNION COUNTY IN SOUTHEAST SOUTH DAKOTA...
* UNTIL 745 PM CDT
* AT 711 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 7 MILES SOUTHWEST OF ALCESTER TO AKRON
TO JEFFERSON...AND MOVING NORTHEAST AT 45 MPH.
* SEVERE THUNDERSTORMS WILL BE NEAR...
HAWARDEN AROUND 725 PM CDT...
NEWTON HILLS STATE PARK AND HUDSON AROUND 730 PM CDT...
CRAIG...IRETON AND FAIRVIEW AROUND 735 PM CDT...
CANTON AROUND 740 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 4249 9650 4272 9662 4288 9681 4309 9681
4341 9665 4331 9653 4329 9655 4330 9658
4327 9659 4326 9648 4301 9620 4256 9646
4256 9650 4254 9647
TIME...MOT...LOC 0011Z 207DEG 41KT 4300 9670 4284 9652
4269 9650
WIND...HAIL 60MPH <1.00IN
$$
BT2 follow-up statements
747
WWUS53 KFSD 280018
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
718 PM CDT SUN MAY 27 2012
IAC149-167-SDC083-127-280045-
/O.CON.KFSD.SV.W.0129.000000T0000Z-120528T0045Z/
SIOUX IA-PLYMOUTH IA-LINCOLN SD-UNION SD-
718 PM CDT SUN MAY 27 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR UNION...
EASTERN LINCOLN...WESTERN PLYMOUTH AND WESTERN SIOUX COUNTIES UNTIL
745 PM CDT...
AT 718 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING WALNUT SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM ALCESTER TO 6 MILES NORTHEAST OF
AKRON TO 8 MILES SOUTHEAST OF AKRON...MOVING NORTHEAST AT 45 MPH.
SEVERE THUNDERSTORMS WILL BE NEAR...
HAWARDEN AROUND 725 PM CDT...
NEWTON HILLS STATE PARK AND HUDSON AROUND 730 PM CDT...
CRAIG...IRETON AND FAIRVIEW AROUND 735 PM CDT...
CANTON AROUND 740 PM CDT...
AT 715 PM...A TRAINED SPOTTER REPORTED WALNUT SIZED HAIL AND TREES
DAMAGED BY STRONG WINDS SIX MILES NORTHWEST OF AKRON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS IF YOU ARE IN
THE PATH OF THIS STORM. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.
&&
LAT...LON 4249 9650 4272 9662 4288 9681 4309 9681
4341 9665 4331 9653 4329 9655 4330 9658
4327 9659 4326 9648 4301 9620 4256 9646
4256 9650 4254 9647
TIME...MOT...LOC 0018Z 207DEG 41KT 4307 9665 4291 9647
4276 9645
WIND...HAIL 60MPH 1.50IN
$$
BT278
WWUS53 KFSD 280024
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
724 PM CDT SUN MAY 27 2012
IAC149-167-SDC083-127-280045-
/O.CON.KFSD.SV.W.0129.000000T0000Z-120528T0045Z/
SIOUX IA-PLYMOUTH IA-LINCOLN SD-UNION SD-
724 PM CDT SUN MAY 27 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR UNION...
EASTERN LINCOLN...WESTERN PLYMOUTH AND WESTERN SIOUX COUNTIES UNTIL
745 PM CDT...
AT 725 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED...
PRODUCING WALNUT SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 5 MILES NORTH
OF ALCESTER TO HAWARDEN TO 7 MILES EAST OF AKRON...MOVING NORTHEAST
AT 45 MPH.
SEVERE THUNDERSTORMS WILL BE NEAR...
NEWTON HILLS STATE PARK AND HUDSON AROUND 730 PM CDT...
CRAIG...IRETON AND FAIRVIEW AROUND 735 PM CDT...
CANTON AROUND 740 PM CDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS IF YOU ARE IN
THE PATH OF THIS STORM. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.
&&
LAT...LON 4249 9650 4272 9662 4288 9681 4309 9681
4341 9665 4331 9653 4329 9655 4330 9658
4327 9659 4326 9648 4301 9620 4256 9646
4256 9650 4254 9647
TIME...MOT...LOC 0025Z 207DEG 41KT 4314 9660 4298 9642
4283 9640
WIND...HAIL 60MPH 1.50IN
$$
BTThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 7:22 PM CDT | Flash Flood Warning | FSD | Lyon, Plymouth, Sioux | 7 hr |
| May 27, 7:31 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Plymouth, Sioux | 29 min |
| May 27, 7:54 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, O'Brien, Osceola, Sioux | 36 min |
| May 27, 8:19 PM CDT | Flash Flood Warning | FSD | Lyon, Osceola | 7 hr |
| May 27, 8:54 PM CDT | Severe Thunderstorm Warning | FSD | Dickinson | 36 min |
| May 27, 9:18 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 27 min |
| May 27, 9:42 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 10 min |
| May 28, 5:35 AM CDT | River Flood Warning | FSD | Lyon | 52 hr |
| May 28, 5:35 AM CDT | River Flood Warning | FSD | Clay | 71 hr |
| May 28, 5:35 AM CDT | River Flood Warning | FSD | Clay | 8 days |
| May 28, 5:35 AM CDT | River Flood Warning | FSD | Buena Vista, Clay | 9 days |
| May 27, 9:32 PM CDT | Flash Flood Warning | FSD | Clay, Union | 4 hr |
Nearby
Severe Thunderstorm Warnings in Iowa, 2012Severe Thunderstorm Warnings in South Dakota, 2012Every 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.