Alert archive / Minnesota / Flash Flood Warnings in 2021
Flash Flood Warning 4, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Aug 28, 2021, 10:04 PM CDT for 4 counties in Minnesota; Lyon County, Osceola County, Iowa. It was in force for 4 hr. 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
- Aug 28, 2021, 10:04 PM CDT (03:04 UTC)
- Expired
- Aug 29, 2021, 2:00 AM CDT
- In force
- 4 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Lyon County, IA, Osceola County, IA, Cottonwood County, MN, Jackson County, MN, Murray County, MN, Nobles County, MN
The radar
The Sioux Falls radar (KFSD), 73 km from the middle of the area, began a volume at 03:08 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 |
|---|---|---|---|
| Aug 28, 11:00 PM CDT | FLASH FLOOD | 3 N Avoca, MN | WATER OVER THE ROAD NEAR COUNTY ROAD 30 AND 38. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 3.1 hours before the alert went out and 220 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
- 1990 J/kg
- Mixed-layer CIN
- -120 J/kg
- Mixed-layer LCL
- 977 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 252 m²/s²
- 0-3 km storm-relative helicity
- 227 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 5.0
The text
As transmitted.
511
WGUS53 KFSD 290304
FFWFSD
IAC119-143-MNC033-063-101-105-290700-
/O.NEW.KFSD.FF.W.0004.210829T0304Z-210829T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Sioux Falls SD
1004 PM CDT Sat Aug 28 2021
The National Weather Service in Sioux Falls has issued a
* Flash Flood Warning for...
Eastern Lyon County in northwestern Iowa...
Northwestern Osceola County in northwestern Iowa...
Southwestern Cottonwood County in southwestern Minnesota...
Southwestern Jackson County in southwestern Minnesota...
Southeastern Murray County in southwestern Minnesota...
Nobles County in southwestern Minnesota...
* Until 200 AM CDT.
* At 1004 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain moving into the warned area. The expected rainfall rate
of up to 3 inches per hour through midnight. Additional rainfall
amounts of 1 to 3 inches are possible in the warned area. Flash
flooding is 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...
Worthington, Sibley, Rock Rapids, Slayton, Fulda, Adrian, George,
Inwood, Brewster, Ellsworth, Little Rock, Ashton, Round Lake,
Rushmore, Wilmont, Alvord, Dovray, Bigelow, Avoca and Iona.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4403 9581 4409 9545 4350 9544 4330 9579
4329 9646 4350 9605
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 1 HOUR
$$
Schumacher2 follow-up statements
420
WGUS73 KFSD 290407
FFSFSD
Flash Flood Statement
National Weather Service Sioux Falls SD
1107 PM CDT Sat Aug 28 2021
IAC119-143-MNC033-063-101-105-290700-
/O.CON.KFSD.FF.W.0004.000000T0000Z-210829T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lyon IA-Osceola IA-Cottonwood MN-Jackson MN-Murray MN-Nobles MN-
1107 PM CDT Sat Aug 28 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM CDT SUNDAY FOR
EASTERN LYON, NORTHWESTERN OSCEOLA, SOUTHWESTERN COTTONWOOD,
SOUTHWESTERN JACKSON, SOUTHEASTERN MURRAY AND NOBLES COUNTIES...
At 1107 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. Additional rainfall amounts up to 2 inches are possible
with the heaviest rain south of the Minnesota and Iowa state line.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Worthington, Sibley, Rock Rapids, Slayton, Fulda, Adrian, George,
Inwood, Brewster, Ellsworth, Little Rock, Ashton, Round Lake,
Rushmore, Wilmont, Alvord, Dovray, Bigelow, Avoca and Iona.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4403 9581 4409 9545 4350 9544 4330 9579
4329 9646 4350 9605
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
Schumacher883
WGUS73 KFSD 290701
FFSFSD
Flash Flood Statement
National Weather Service Sioux Falls SD
201 AM CDT Sun Aug 29 2021
IAC119-143-MNC033-063-101-105-290711-
/O.EXP.KFSD.FF.W.0004.000000T0000Z-210829T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lyon IA-Osceola IA-Cottonwood MN-Jackson MN-Murray MN-Nobles MN-
201 AM CDT Sun Aug 29 2021
...FLASH FLOOD WARNING HAS EXPIRED FOR EASTERN LYON, NORTHWESTERN
OSCEOLA, SOUTHWESTERN COTTONWOOD, SOUTHWESTERN JACKSON, SOUTHEASTERN
MURRAY AND NOBLES COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 4403 9581 4409 9545 4350 9544 4330 9579
4329 9646 4350 9605
$$
SSCThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 7:00 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Lyon, Murray, Pipestone | 45 min |
| Aug 28, 7:23 PM CDT | Severe Thunderstorm Warning | FSD | Rock | 52 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, 8:52 PM CDT | Severe Thunderstorm Warning | FSD | Murray, Nobles, Rock | 23 min |
| Aug 28, 9:13 PM CDT | Severe Thunderstorm Warning | FSD | Jackson, Nobles, Rock | 47 min |
| Aug 28, 9:29 PM CDT | Flash Flood Warning | FSD | Murray, Nobles, Pipestone, Rock | 3 hr |
| Aug 28, 10:24 PM CDT | Flash Flood Warning | FSD | Cottonwood, Jackson | 5 hr |
Nearby
Flash Flood Warnings in Minnesota, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.