Alert archive / Iowa / Flash Flood Warnings in 2017
Flash Flood Warning 4, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Aug 24, 2017, 8:21 PM CDT for Plymouth County, Iowa. It was in force for 4 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 24, 2017, 8:21 PM CDT (01:21 UTC)
- Expired
- Aug 25, 2017, 12:15 AM CDT
- In force
- 4 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
County Plymouth County, IA
The radar
The Sioux Falls radar (KFSD), 110 km from the middle of the area, began a volume at 01:23 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
Omaha, NE (KOAX), launched 00:00Z, 1.4 hours before the alert went out and 151 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
- 6 J/kg
- Mixed-layer CIN
- -329 J/kg
- Mixed-layer LCL
- 1522 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 224 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted.
578 WGUS53 KFSD 250121 FFWFSD IAC149-250515- /O.NEW.KFSD.FF.W.0004.170825T0121Z-170825T0515Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Sioux Falls SD 821 PM CDT THU AUG 24 2017 The National Weather Service in Sioux Falls has issued a * Flash Flood Warning for... Southeastern Plymouth County in northwestern Iowa... * Until 1215 AM CDT * At 820 PM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Up to three inches of rain have already fallen. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Le Mars, Kingsley, Hinton and Merrill. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. Please report flooding to your local law enforcement agency when you can do so safely. A Flash Flood Warning means that flooding is imminent or occurring. If you are in the warned area move to higher ground immediately. Residents living along streams and creeks should take immediate precautions to protect life and property. && LAT...LON 4263 9642 4278 9639 4275 9592 4256 9599 $$ Dux
1 follow-up statement
144 WGUS73 KFSD 250333 FFSFSD Flash Flood Statement National Weather Service Sioux Falls SD 1033 PM CDT THU AUG 24 2017 IAC149-250515- /O.CON.KFSD.FF.W.0004.000000T0000Z-170825T0515Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Plymouth IA- 1033 PM CDT THU AUG 24 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT FOR SOUTHEASTERN PLYMOUTH COUNTY... At 1032 PM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Up to three to four inches of rain have already fallen. Flash flooding and rapid rises in area creeks and streams is taking place. Some locations that will experience flooding include... Le Mars, Kingsley, Hinton and Merrill. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. Please report flooding to your local law enforcement agency when you can do so safely. A Flash Flood Warning means that flooding is imminent or occurring. If you are in the warned area move to higher ground immediately. Residents living along streams and creeks should take immediate precautions to protect life and property. && LAT...LON 4263 9642 4278 9639 4275 9592 4256 9599 $$ Dux
Nearby
Flash Flood Warnings in Iowa, 2017Every flash flood warning in 2017
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.