Alert archive / Iowa / Flash Flood Warnings in 2018
Flash Flood Warning 5, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Jun 9, 2018, 9:30 PM CDT for Clayton County, Fayette County, Iowa. It was in force for 3 hr. 2 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 9, 2018, 9:30 PM CDT (02:30 UTC)
- Expired
- Jun 10, 2018, 12:30 AM CDT
- In force
- 3 hr
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Flood severity
- None
Counties Clayton County, IA, Fayette County, IA
The radar
The La Crosse radar (KARX), 129 km from the middle of the area, began a volume at 02:34 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 9, 10:03 PM CDT | FLASH FLOOD | 2 Sw Maynard, IA | WATER OVER HIGHWAY 150 BETWEEN OELWEIN AND MAYNARD. |
| Jun 9, 11:00 PM CDT | HEAVY RAIN 5.2 | Maynard, IA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 2.5 hours before the alert went out and 158 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
- 1247 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 1107 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 142 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.7
The text
As transmitted.
852 WGUS53 KARX 100230 FFWARX IAC043-065-100530- /O.NEW.KARX.FF.W.0005.180610T0230Z-180610T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service La Crosse WI 930 PM CDT SAT JUN 9 2018 The National Weather Service in La Crosse has issued a * Flash Flood Warning for... Southwestern Clayton County in northeastern Iowa... Southern Fayette County in northeastern Iowa... * Until 1230 AM CDT * At 928 PM CDT, local law enforcement reported heavy rain across the warned area. Several roads are underwater south of Maynard in Fayette county. * Some locations that will experience flooding include... Oelwein, Fayette, Strawberry Point, Edgewood, Maynard, Colesburg, Volga, Wadena, Westgate, Garber, Osterdock, and Elkport. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. && LAT...LON 4265 9208 4284 9208 4284 9117 4264 9116 $$ Rieck
2 follow-up statements
518 WGUS73 KARX 100433 FFSARX Flash Flood Statement National Weather Service La Crosse WI 1133 PM CDT SAT JUN 9 2018 IAC043-065-100530- /O.CON.KARX.FF.W.0005.000000T0000Z-180610T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clayton IA-Fayette IA- 1133 PM CDT SAT JUN 9 2018 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT FOR SOUTHWESTERN CLAYTON AND SOUTHERN FAYETTE COUNTIES... At 1128 PM CDT, emergency management in Fayette county has indicated that water was starting to recede south of Maynard, but problems were still ongoing with water across roads along with damage to some. Some locations that will experience flooding include... Oelwein, Fayette, Strawberry Point, Edgewood, Maynard, Arlington, Colesburg, Westgate, Garber, Osterdock, and Elkport. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. && LAT...LON 4265 9208 4284 9208 4284 9117 4264 9116 $$ Rieck
447 WGUS73 KARX 100530 FFSARX Flash Flood Statement National Weather Service La Crosse WI 1230 AM CDT SUN JUN 10 2018 IAC043-065-100537- /O.EXP.KARX.FF.W.0005.000000T0000Z-180610T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clayton IA-Fayette IA- 1230 AM CDT SUN JUN 10 2018 ...THE FLASH FLOOD WARNING FOR SOUTHWESTERN CLAYTON AND SOUTHERN FAYETTE COUNTIES WILL EXPIRE AT 1230 AM CDT... Law enforcement and emergencey management has indicated improvement in the flooding conditions, although some roads remained closed due to water or flood related damage. With the threat for further heavy rainfall ended, the flash flood warning will be allow to expire. LAT...LON 4265 9208 4284 9208 4284 9117 4264 9116 $$ Rieck
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 7:02 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 88 min |
| Jun 9, 7:28 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 47 min |
| Jun 9, 8:44 PM CDT | Areal Flood Warning | ARX | Howard, Winneshiek | 6 hr |
| Jun 9, 8:57 PM CDT | River Flood Warning | ARX | Winneshiek | 49 hr |
| Jun 9, 8:57 PM CDT | River Flood Warning | ARX | Clayton | 3 days |
| Jun 9, 8:57 PM CDT | River Flood Warning | ARX | Clayton | 3 days |
| Jun 9, 9:00 PM CDT | River Flood Warning | ARX | Floyd | 3 days |
| Jun 9, 9:01 PM CDT | River Flood Warning | ARX | Allamakee | 3 days |
| Jun 10, 12:45 AM CDT | River Flood Warning | ARX | Winneshiek | 18 hr |
| Jun 10, 1:46 PM CDT | River Flood Warning | ARX | Winneshiek | 29 hr |
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.