Alert archive / Minnesota / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS Sioux Falls, SD

August 28, 2021Murray County, Pipestone County, Minnesota

NWS Sioux Falls, SD issued this flash flood warning at Aug 28, 2021, 8:03 PM CDT for Murray County, Pipestone County, Minnesota. It was in force for 6 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, 8:03 PM CDT (01:03 UTC)
Expired: Aug 29, 2021, 2:00 AM CDT
In force: 6 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

Counties Murray County, MN, Pipestone County, MN

The radar

The Sioux Falls radar (KFSD), 84 km from the middle of the area, began a volume at 01:01 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, 9:55 PM CDT	FLASH FLOOD	Pipestone, MN	DELAYED REPORT FROM SOCIAL MEDIA. REPORT STATES THEIR GARAGE IS FLOODED, AND THE STREET IN FRONT OF THE HOUSE HAD WATER OVER THE CURB.

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, 1.1 hours before the alert went out and 203 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted.

012 
WGUS53 KFSD 290103
FFWFSD
MNC101-117-290700-
/O.NEW.KFSD.FF.W.0001.210829T0103Z-210829T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Sioux Falls SD
803 PM CDT Sat Aug 28 2021

The National Weather Service in Sioux Falls has issued a

* Flash Flood Warning for...
  Northern Murray County in southwestern Minnesota...
  Central Pipestone County in southwestern Minnesota...

* Until 200 AM CDT.

* At 803 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Radar estimates between 1.5 and 
  3 inches of rain have fallen. Additional rainfall amounts of 1 to 
  3 inches are possible in the warned area through midnight. 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...
  Pipestone, Lake Wilson, Currie, Holland, Woodstock, Current Lake, 
  Lake Shetek State Park, Pipestone National Monument, Ihlen and 
  Hatfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4387 9640 4403 9639 4412 9620 4419 9591
      4419 9546 4418 9546 4417 9546 4409 9549
      4403 9582 4397 9606

FLASH FLOOD...RADAR INDICATED

$$

Schumacher

3 follow-up statements

063 
WGUS73 KFSD 290226
FFSFSD

Flash Flood Statement
National Weather Service Sioux Falls SD
926 PM CDT Sat Aug 28 2021

MNC101-117-290700-
/O.CON.KFSD.FF.W.0001.000000T0000Z-210829T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Murray MN-Pipestone MN-
926 PM CDT Sat Aug 28 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM CDT SUNDAY FOR 
NORTHERN MURRAY AND CENTRAL PIPESTONE COUNTIES...

At 926 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 4 inches of rain have 
fallen. Additional rainfall amounts up to 2 inches are possible with 
the heaviest rainfall expected over northern Murray County. 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...
  Pipestone, Lake Wilson, Currie, Holland, Woodstock, Current Lake, 
  Lake Shetek State Park, Pipestone National Monument, Ihlen and 
  Hatfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4387 9640 4403 9639 4412 9620 4419 9591
      4419 9546 4418 9546 4417 9546 4409 9549
      4403 9582 4397 9606

FLASH FLOOD...RADAR INDICATED

$$

Schumacher

275 
WGUS73 KFSD 290349
FFSFSD

Flash Flood Statement
National Weather Service Sioux Falls SD
1049 PM CDT Sat Aug 28 2021

MNC101-117-290700-
/O.CON.KFSD.FF.W.0001.000000T0000Z-210829T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Murray MN-Pipestone MN-
1049 PM CDT Sat Aug 28 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM CDT SUNDAY FOR 
NORTHERN MURRAY AND CENTRAL PIPESTONE COUNTIES...

At 1049 PM CDT, Doppler radar and trained spotters indicated that 
heavy rain had fallen across the warned area. Between 2 and 7 inches 
has been reported. While heavy rain has ended across the area, flash 
flooding is ongoing.

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...
  Pipestone, Lake Wilson, Currie, Holland, Woodstock, Current Lake, 
  Lake Shetek State Park, Pipestone National Monument, Ihlen and 
  Hatfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4387 9640 4403 9639 4412 9620 4419 9591
      4419 9546 4418 9546 4417 9546 4409 9549
      4403 9582 4397 9606

FLASH FLOOD...RADAR INDICATED

$$

Schumacher

470 
WGUS73 KFSD 290422
FFSFSD

Flash Flood Statement
National Weather Service Sioux Falls SD
1122 PM CDT Sat Aug 28 2021

MNC117-290432-
/O.CAN.KFSD.FF.W.0001.000000T0000Z-210829T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pipestone MN-
1122 PM CDT Sat Aug 28 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL PIPESTONE COUNTY...

Heavy rain has ended and flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 4415 9606 4419 9591 4419 9546 4418 9546
      4417 9546 4416 9546 4409 9549 4403 9582
      4397 9606 4412 9606 4414 9606

$$

MNC101-290700-
/O.CON.KFSD.FF.W.0001.000000T0000Z-210829T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Murray MN-
1122 PM CDT Sat Aug 28 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM CDT SUNDAY FOR 
NORTHERN MURRAY COUNTY...

At 1122 PM CDT, Doppler radar indicated thunderstorms had producing 
heavy rain across northern Murray County. Between 2 and 7 inches of 
rain have fallen.

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...
  Lake Wilson, Currie, Lake Shetek State Park and Current Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4415 9606 4419 9591 4419 9546 4418 9546
      4417 9546 4416 9546 4409 9549 4403 9582
      4397 9606 4412 9606 4414 9606

FLASH FLOOD...RADAR INDICATED

$$

Schumacher

The 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 Considerable damage threat	FSD	Lincoln, Lyon, Murray, Pipestone	45 min
Aug 28, 7:23 PM CDT	Severe Thunderstorm Warning Considerable damage threat	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, 8:06 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Nobles, Rock	54 min
Aug 28, 8:17 PM CDT	Severe Thunderstorm Warning Considerable damage threat	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, 10:04 PM CDT	Flash Flood Warning	FSD	Cottonwood, Jackson, Murray, Nobles	4 hr
Aug 28, 10:24 PM CDT	Flash Flood Warning	FSD	Cottonwood, Jackson	5 hr

Nearby

Flash Flood Warnings in Minnesota, 2021 Every 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.