Alert archive / South Dakota / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 211, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 4, 2012, 8:14 PM CDT for Lyon County, Sioux County, Iowa; 4 counties in South Dakota. It was in force for 46 min. 1 report 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
- Sep 4, 2012, 8:14 PM CDT (01:14 UTC)
- Expired
- Sep 4, 2012, 9:00 PM CDT
- In force
- 46 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Lyon County, IA, Sioux County, IA, Clay County, SD, Lincoln County, SD, Turner County, SD, Union County, SD
The radar
The Sioux Falls radar (KFSD), 40 km from the middle of the area, began a volume at 01:15 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 |
|---|---|---|---|
| Sep 4, 8:14 PM CDT | HAIL 1 | 4 Sse Davis, SD |
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 |
|---|---|---|---|
| Sep 4, 7:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 1.2 hours before the alert went out and 215 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
- 2236 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 2432 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 172 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.2
The text
As transmitted, in the capitals the NWS used until 2016.
239 WUUS53 KFSD 050114 SVRFSD IAC119-167-SDC027-083-125-127-050200- /O.NEW.KFSD.SV.W.0211.120905T0114Z-120905T0200Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 814 PM CDT TUE SEP 4 2012 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN LYON COUNTY IN NORTHWEST IOWA... WESTERN SIOUX COUNTY IN NORTHWEST IOWA... NORTHEASTERN CLAY COUNTY IN SOUTHEAST SOUTH DAKOTA... LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA... SOUTHEASTERN TURNER COUNTY IN SOUTHEAST SOUTH DAKOTA... NORTHERN UNION COUNTY IN SOUTHEAST SOUTH DAKOTA... * UNTIL 900 PM CDT * AT 815 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 WORTHING TO 7 MILES SOUTH OF CENTERVILLE...AND MOVING NORTHEAST AT 50 MPH. * SEVERE THUNDERSTORMS WILL BE NEAR... BERESFORD AROUND 820 PM CDT... HARRISBURG...ALCESTER AND CANTON AROUND 825 PM CDT... NEWTON HILLS STATE PARK AROUND 830 PM CDT... HAWARDEN AND FAIRVIEW AROUND 835 PM CDT... LARCHWOOD...INWOOD AND HUDSON AROUND 840 PM CDT... LESTER AND ALVORD AROUND 845 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 4350 9627 4293 9635 4291 9702 4341 9692 TIME...MOT...LOC 0115Z 246DEG 43KT 4329 9675 4304 9684 WIND...HAIL 60MPH 1.00IN $$ CHENARD
2 follow-up statements
299
WWUS53 KFSD 050142
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
842 PM CDT TUE SEP 4 2012
SDC027-125-050152-
/O.CAN.KFSD.SV.W.0211.000000T0000Z-120905T0200Z/
CLAY SD-TURNER SD-
842 PM CDT TUE SEP 4 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TURNER AND
NORTHEASTERN CLAY COUNTIES IS CANCELLED...
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE
WARNED AREA.
LAT...LON 4301 9681 4345 9661 4350 9627 4294 9635
4292 9680
TIME...MOT...LOC 0142Z 253DEG 39KT 4332 9638 4295 9653
$$
IAC119-167-SDC083-127-050200-
/O.CON.KFSD.SV.W.0211.000000T0000Z-120905T0200Z/
SIOUX IA-LYON IA-LINCOLN SD-UNION SD-
842 PM CDT TUE SEP 4 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
UNION...EASTERN LINCOLN...WESTERN LYON AND WESTERN SIOUX COUNTIES
UNTIL 900 PM CDT...
AT 842 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 INWOOD TO 6 MILES SOUTHWEST OF
HAWARDEN...MOVING EAST AT 45 MPH.
SEVERE THUNDERSTORMS WILL BE NEAR...
LESTER AROUND 850 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 4301 9681 4345 9661 4350 9627 4294 9635
4292 9680
TIME...MOT...LOC 0142Z 253DEG 39KT 4332 9638 4295 9653
WIND...HAIL 60MPH 1.00IN
$$
CHENARD144
WWUS53 KFSD 050201
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
901 PM CDT TUE SEP 4 2012
IAC119-167-SDC083-127-050210-
/O.EXP.KFSD.SV.W.0211.000000T0000Z-120905T0200Z/
SIOUX IA-LYON IA-LINCOLN SD-UNION SD-
901 PM CDT TUE SEP 4 2012
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN UNION...EASTERN
LINCOLN...WESTERN LYON AND WESTERN SIOUX COUNTIES HAS EXPIRED...
THE WORST OF THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE
MOVED OUT OF THE WARNED AREA...HOWEVER SMALL HAIL AND GUSTY WINDS
ARE STILL POSSIBLE WITH THESE THUNDERSTORMS. ANOTHER WARNING HAS
BEEN ISSUED TO THE EAST.
LAT...LON 4301 9681 4345 9661 4350 9627 4294 9635
4292 9680
TIME...MOT...LOC 0142Z 253DEG 39KT 4332 9638 4295 9653
$$
CHENARDThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 9:32 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, O'Brien, Osceola | 58 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, 10:28 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, O'Brien, Osceola | 47 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 |
| Sep 4, 7:13 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Davison, Hanson, Sanborn | 47 min |
| Sep 4, 7:37 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Jerauld | 38 min |
| Sep 4, 7:49 PM CDT | Severe Thunderstorm Warning | FSD | Hanson, Lake, McCook, Miner | 41 min |
| Sep 4, 7:59 PM CDT | Severe Thunderstorm Warning | FSD | Davison, Hanson | 31 min |
| Sep 4, 8:27 PM CDT | Severe Thunderstorm Warning | FSD | Hanson, McCook, Miner | 33 min |
| Sep 4, 8:52 PM CDT | Severe Thunderstorm Warning | FSD | Lake, Lincoln, McCook, Minnehaha, Moody, Turner | 38 min |
| Sep 4, 9:28 PM CDT | Severe Thunderstorm Warning | FSD | Minnehaha, Moody | 47 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2012Severe Thunderstorm Warnings in Iowa, 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.