Alert archive / Iowa / Flash Flood Warnings in 2018
Flash Flood Warning 4, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Jun 14, 2018, 7:37 AM CDT for Buena Vista County, Clay County, Iowa. It was in force for 3 hr. 3 reports 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
- Jun 14, 2018, 7:37 AM CDT (12:37 UTC)
- Expired
- Jun 14, 2018, 10:30 AM CDT
- In force
- 3 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Buena Vista County, IA, Clay County, IA
The radar
The Sioux Falls radar (KFSD), 152 km from the middle of the area, began a volume at 12:40 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 |
|---|---|---|---|
| Jun 14, 8:40 AM CDT | HEAVY RAIN 2.56 | 1 N Gillett Grove, IA | |
| Jun 14, 8:54 AM CDT | HEAVY RAIN 3.84 | 2 N Sioux Rapids, IA | |
| Jun 14, 9:12 AM CDT | FLASH FLOOD | Webb, IA | WATER OVER ROADWAYS. REPORTED 5.0 INCHES OF RAIN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 0.6 hours before the alert went out and 207 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
- 1543 J/kg
- Mixed-layer CIN
- -305 J/kg
- Mixed-layer LCL
- 1231 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 219 m²/s²
- 0-3 km storm-relative helicity
- 312 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.2
The text
As transmitted.
116
WGUS53 KFSD 141237
FFWFSD
IAC021-041-141530-
/O.NEW.KFSD.FF.W.0004.180614T1237Z-180614T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Sioux Falls SD
737 AM CDT THU JUN 14 2018
The National Weather Service in Sioux Falls has issued a
* Flash Flood Warning for...
Northeastern Buena Vista County in northwestern Iowa...
Southeastern Clay County in northwestern Iowa...
* Until 1030 AM CDT.
* At 736 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to two inches of rain have
already fallen. Flash flooding is expected to begin shortly as
rain continues to fall over the next hour.
* Some locations that will experience flooding include...
Sioux Rapids, Marathon, Linn Grove, Webb, Greenville, Rossie and
Gillett Grove.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report flooding to your local law enforcement agency when you
can do so safely.
&&
LAT...LON 4283 9509 4287 9528 4297 9528 4305 9510
4307 9491 4283 9491
$$
VandenBoogart2 follow-up statements
979
WGUS73 KFSD 141330
FFSFSD
Flash Flood Statement
National Weather Service Sioux Falls SD
830 AM CDT THU JUN 14 2018
IAC021-041-141530-
/O.CON.KFSD.FF.W.0004.000000T0000Z-180614T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Buena Vista IA-Clay IA-
830 AM CDT THU JUN 14 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 AM CDT FOR
NORTHEASTERN BUENA VISTA AND SOUTHEASTERN CLAY COUNTIES...
At 829 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Three to five inches of rain have
fallen. Flash flooding is expected.
Some locations that will experience flooding include...
Sioux Rapids, Marathon, Linn Grove, Webb, Greenville, Rossie and
Gillett Grove.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report flooding to your local law enforcement agency when you
can do so safely.
&&
LAT...LON 4283 9509 4287 9528 4297 9528 4305 9510
4307 9491 4283 9491
$$
BT189
WGUS73 KFSD 141524
FFSFSD
Flash Flood Statement
National Weather Service Sioux Falls SD
1024 AM CDT THU JUN 14 2018
IAC021-041-141534-
/O.EXP.KFSD.FF.W.0004.000000T0000Z-180614T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Buena Vista IA-Clay IA-
1024 AM CDT THU JUN 14 2018
...THE FLASH FLOOD WARNING FOR NORTHEASTERN BUENA VISTA AND
SOUTHEASTERN CLAY COUNTIES WILL EXPIRE AT 1030 AM CDT...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 4283 9509 4287 9528 4297 9528 4305 9510
4307 9491 4283 9491
$$
BTThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 14, 3:15 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Plymouth, Woodbury | 30 min |
| Jun 14, 3:41 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Plymouth | 34 min |
| Jun 14, 4:18 AM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien | 27 min |
| Jun 14, 5:32 AM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien | 28 min |
| Jun 14, 6:20 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, Osceola | 12 min |
| Jun 14, 7:01 AM CDT | Flash Flood Warning | FSD | Lyon, O'Brien, Osceola | 3 hr |
| Jun 14, 10:08 AM CDT | River Flood Warning | FSD | Buena Vista, Clay | 38 days |
| Jun 14, 10:41 AM CDT | Areal Flood Warning | FSD | O'Brien, Sioux | 24 hr |
| Jun 14, 2:50 PM CDT | Heat Advisory | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, O'Brien and 4 more | 3 days |
Nearby
Flash Flood Warnings in Iowa, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.