Alert archive / Minnesota / Flash Flood Warnings in 2018
Flash Flood Warning 1, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at May 23, 2018, 3:20 AM CDT for Cottonwood County, Minnesota. 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
- May 23, 2018, 3:20 AM CDT (08:20 UTC)
- Expired
- May 23, 2018, 6:15 AM CDT
- In force
- 3 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
County Cottonwood County, MN
The radar
The Sioux Falls radar (KFSD), 134 km from the middle of the area, began a volume at 08:22 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
Minneapolis, MN (KMPX), launched 00:00Z, 8.3 hours before the alert went out and 159 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1364 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
779 WGUS53 KFSD 230820 FFWFSD MNC033-231115- /O.NEW.KFSD.FF.W.0001.180523T0820Z-180523T1115Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Sioux Falls SD 320 AM CDT WED MAY 23 2018 The National Weather Service in Sioux Falls has issued a * Flash Flood Warning for... South central Cottonwood County in southwestern Minnesota... * Until 615 AM CDT. * At 317 AM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Areas near Windom and Bingham Lake. Areas north and west of Windom will likely see the greatest runoff and potential for flash flooding, especially with additional scattered storms forming to the west which will move across the area through around 5 am. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. && LAT...LON 4395 9502 4386 9504 4388 9530 4399 9527 $$ Chapman
2 follow-up statements
257 WGUS73 KFSD 230937 FFSFSD Flash Flood Statement National Weather Service Sioux Falls SD 437 AM CDT WED MAY 23 2018 MNC033-231115- /O.CON.KFSD.FF.W.0001.000000T0000Z-180523T1115Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Cottonwood MN- 437 AM CDT WED MAY 23 2018 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 AM CDT FOR SOUTH CENTRAL COTTONWOOD COUNTY... At 436 AM CDT, Doppler radar indicated heavy rain across the warned area. Flash flooding, if not already underway, is expected to begin shortly. Some locations that will experience flooding include... Areas north of Windom and Bingham Lake. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, country roads, farmland, and other low lying spots. && LAT...LON 4395 9502 4386 9504 4388 9530 4399 9527 $$ Chapman
748 WGUS73 KFSD 231118 FFSFSD Flash Flood Statement National Weather Service Sioux Falls SD 618 AM CDT WED MAY 23 2018 MNC033-231122- /O.EXP.KFSD.FF.W.0001.000000T0000Z-180523T1115Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Cottonwood MN- 618 AM CDT WED MAY 23 2018 ...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL COTTONWOOD COUNTY WILL EXPIRE AT 615 AM CDT... The heavy rain has ended, and runoff from the earlier rainfall from an estimated 3 to 4 inches rainfall has likely ended. Flooding is no longer expected to pose a significant threat, but please continue to heed any remaining road closures if water remains over any roadways. LAT...LON 4395 9502 4386 9504 4388 9530 4399 9527 $$ Chapman
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 1:19 AM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Jackson | 26 min |
| May 23, 2:34 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, Murray | 12 min |
Nearby
Flash Flood Warnings in Minnesota, 2018Every flash flood warning in 2018
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.