Alert archive / Minnesota / Flash Flood Warnings in 2021
Flash Flood Warning 3, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Aug 28, 2021, 9:29 PM CDT for Lyon County, Iowa; 4 counties in Minnesota; Lincoln County, Minnehaha County, South Dakota. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 28, 2021, 9:29 PM CDT (02:29 UTC)
- Expired
- Aug 29, 2021, 12:30 AM CDT
- In force
- 3 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Lyon County, IA, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Lincoln County, SD, Minnehaha County, SD
The radar
The Sioux Falls radar (KFSD), 25 km from the middle of the area, began a volume at 02:29 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 nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 2.5 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
- 143 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 1242 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 268 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.2
The text
As transmitted.
642
WGUS53 KFSD 290229
FFWFSD
IAC119-MNC101-105-117-133-SDC083-099-290530-
/O.NEW.KFSD.FF.W.0003.210829T0229Z-210829T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Sioux Falls SD
929 PM CDT Sat Aug 28 2021
The National Weather Service in Sioux Falls has issued a
* Flash Flood Warning for...
Northwestern Lyon County in northwestern Iowa...
Southwestern Murray County in southwestern Minnesota...
Northwestern Nobles County in southwestern Minnesota...
Southern Pipestone County in southwestern Minnesota...
Rock County in southwestern Minnesota...
Northeastern Lincoln County in southeastern South Dakota...
Southeastern Minnehaha County in southeastern South Dakota...
* Until 1230 AM CDT.
* At 929 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. The expected rainfall rate is 1 to 3 inches in 1
hour. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Luverne, Canton, Harrisburg, Edgerton, Garretson, Worthing,
Larchwood, Inwood, Valley Springs, Hills, Jasper, Leota, Beaver
Creek, Lester, Chandler, Lake Wilson, Lismore, Hardwick, Trosky
and Sherman.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4362 9652 4385 9646 4385 9645 4387 9645
4403 9582 4351 9605 4350 9607 4331 9645
4330 9653 4330 9678 4343 9672 4343 9659
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 1 HOUR
$$
Schumacher3 follow-up statements
071
WGUS73 KFSD 290312
FFSFSD
Flash Flood Statement
National Weather Service Sioux Falls SD
1012 PM CDT Sat Aug 28 2021
IAC119-MNC101-105-117-133-SDC083-099-290530-
/O.CON.KFSD.FF.W.0003.000000T0000Z-210829T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lyon IA-Murray MN-Nobles MN-Pipestone MN-Rock MN-Lincoln SD-
Minnehaha SD-
1012 PM CDT Sat Aug 28 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT SUNDAY
FOR NORTHWESTERN LYON, SOUTHWESTERN MURRAY, NORTHWESTERN NOBLES,
SOUTHERN PIPESTONE, ROCK, NORTHEASTERN LINCOLN AND SOUTHEASTERN
MINNEHAHA COUNTIES...
At 1012 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 4 inches of rain
have fallen. The expected rainfall rate is 1 to 3 inches per hour.
The heaviest rainfall is expected to be south of I-90. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Luverne, Canton, Harrisburg, Edgerton, Garretson, Worthing,
Larchwood, Inwood, Valley Springs, Hills, Jasper, Leota, Beaver
Creek, Lester, Chandler, Lake Wilson, Lismore, Hardwick, Trosky
and Sherman.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4362 9652 4385 9646 4385 9645 4387 9645
4403 9582 4351 9605 4350 9607 4331 9645
4330 9653 4330 9678 4343 9672 4343 9659
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-3 INCHES IN 1 HOUR
$$
Schumacher527
WGUS73 KFSD 290435
FFSFSD
Flash Flood Statement
National Weather Service Sioux Falls SD
1135 PM CDT Sat Aug 28 2021
MNC101-117-290445-
/O.CAN.KFSD.FF.W.0003.000000T0000Z-210829T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Murray MN-Pipestone MN-
1135 PM CDT Sat Aug 28 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN MURRAY AND
SOUTHERN PIPESTONE COUNTIES...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 4362 9652 4368 9650 4367 9598 4351 9605
4331 9645 4330 9653 4330 9678 4343 9672
4343 9659
$$
IAC119-MNC105-133-SDC083-099-290530-
/O.CON.KFSD.FF.W.0003.000000T0000Z-210829T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lyon IA-Nobles MN-Rock MN-Lincoln SD-Minnehaha SD-
1135 PM CDT Sat Aug 28 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT SUNDAY
FOR NORTHWESTERN LYON, WEST CENTRAL NOBLES, SOUTHERN ROCK,
NORTHEASTERN LINCOLN AND SOUTHEASTERN MINNEHAHA COUNTIES...
At 1135 PM CDT, Doppler radar indicated thunderstorms had produced
heavy rain across the warned area. Between 1 and 4 inches of rain
had fallen. The heavy rain has ended across the area but continued
runoff from the earlier rainfall will cause flooding in low-lying
areas.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Luverne, Canton, Harrisburg, Worthing, Larchwood, Inwood, Valley
Springs, Hills, Beaver Creek, Lester, Rowena, Magnolia and Steen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4362 9652 4368 9650 4367 9598 4351 9605
4331 9645 4330 9653 4330 9678 4343 9672
4343 9659
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Schumacher419
WGUS73 KFSD 290529
FFSFSD
Flash Flood Statement
National Weather Service Sioux Falls SD
1229 AM CDT Sun Aug 29 2021
IAC119-MNC105-133-SDC083-099-290539-
/O.EXP.KFSD.FF.W.0003.000000T0000Z-210829T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lyon IA-Nobles MN-Rock MN-Lincoln SD-Minnehaha SD-
1229 AM CDT Sun Aug 29 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1230 AM CDT EARLY THIS MORNING
FOR NORTHWESTERN LYON, WEST CENTRAL NOBLES, SOUTHERN ROCK,
NORTHEASTERN LINCOLN AND SOUTHEASTERN MINNEHAHA COUNTIES...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
LAT...LON 4362 9652 4368 9650 4367 9598 4351 9605
4331 9645 4330 9653 4330 9678 4343 9672
4343 9659
$$
KalinThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 7:23 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 52 min |
| Aug 28, 8:52 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Osceola, Sioux | 23 min |
| Aug 28, 9:13 PM CDT | Severe Thunderstorm Warning | FSD | Dickinson, Lyon, O'Brien, Osceola, Sioux | 47 min |
| Aug 28, 10:04 PM CDT | Flash Flood Warning | FSD | Lyon, Osceola | 4 hr |
| Aug 28, 10:24 PM CDT | Flash Flood Warning | FSD | Dickinson, Osceola | 5 hr |
| Aug 28, 7:00 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Lyon, Murray, Pipestone | 45 min |
| Aug 28, 7:34 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Murray, Pipestone | 56 min |
| Aug 28, 7:48 PM CDT | Severe Thunderstorm Warning | FSD | Rock | 31 min |
| Aug 28, 8:03 PM CDT | Flash Flood Warning | FSD | Murray, Pipestone | 6 hr |
| Aug 28, 8:06 PM CDT | Severe Thunderstorm Warning | FSD | Nobles, Rock | 54 min |
| Aug 28, 8:17 PM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Lyon, Murray | 58 min |
| Aug 28, 7:25 PM CDT | Severe Thunderstorm Warning | FSD | Hanson, Lake, McCook, Miner, Minnehaha, Moody | 50 min |
| Aug 28, 7:27 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Hutchinson, Turner, Yankton | 48 min |
| Aug 28, 7:50 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Clay, Hutchinson, Lincoln, Turner, Yankton | 40 min |
| Aug 28, 9:20 PM CDT | Flash Flood Warning | FSD | Lincoln, Minnehaha | 85 min |
| Aug 28, 10:36 PM CDT | Flash Flood Warning | FSD | Lincoln, Minnehaha | 114 min |
| Aug 28, 11:46 PM CDT | River Flood Warning | FSD | Lincoln, Minnehaha | 8 hr |
| Aug 29, 7:44 AM CDT | River Flood Warning | FSD | Lincoln | 15 hr |
Nearby
Flash Flood Warnings in Minnesota, 2021Flash Flood Warnings in South Dakota, 2021Flash Flood Warnings in Iowa, 2021Every flash flood warning in 2021
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.