Alert archive / Iowa / Flash Flood Warnings in 2017
Flash Flood Warning 16, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Jul 21, 2017, 10:18 AM CDT for Fayette County, Iowa. It was in force for 3 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
- Jul 21, 2017, 10:18 AM CDT (15:18 UTC)
- Expired
- Jul 21, 2017, 1:15 PM CDT
- In force
- 3 hr
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Flood severity
- None
County Fayette County, IA
The radar
The La Crosse radar (KARX), 119 km from the middle of the area, began a volume at 15:20 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 |
|---|---|---|---|
| Jul 21, 11:38 AM CDT | FLASH FLOOD | 6 Nw Westgate, IA | WATER OVER THE ROAD. |
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 12:00Z, 3.3 hours before the alert went out and 181 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
- 81 J/kg
- Mixed-layer CIN
- -302 J/kg
- Mixed-layer LCL
- 1173 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 125 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
835 WGUS53 KARX 211518 FFWARX IAC065-211815- /O.NEW.KARX.FF.W.0016.170721T1518Z-170721T1815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service La Crosse WI 1018 AM CDT FRI JUL 21 2017 The National Weather Service in La Crosse has issued a * Flash Flood Warning for... Fayette County in northeastern Iowa... * Until 115 PM CDT * At 1016 AM CDT, trained weather spotters reported over three inches of rain in Sumner Iowa with flooded fields and some roads starting to become flooded. Radar shows heavy rain has already fallen across mainly central Fayette County, with more rain to come. * Some locations that will experience flooding include... West Union, Fayette, Elgin, Clermont, Maynard, Hawkeye, Arlington, Waucoma, Wadena, and Westgate. LAT...LON 4275 9208 4308 9208 4308 9161 4274 9161 $$ Shea
3 follow-up statements
114 WGUS73 KARX 211608 FFSARX Flash Flood Statement National Weather Service La Crosse WI 1108 AM CDT FRI JUL 21 2017 IAC065-211815- /O.CON.KARX.FF.W.0016.000000T0000Z-170721T1815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Fayette IA- 1108 AM CDT FRI JUL 21 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM CDT FOR FAYETTE COUNTY... At 1106 AM CDT, Doppler radar continues to show 2 to 4 inches of rain has fallen over parts of Fayette County, from Sumner through Fayette to Wadena. Law enforcement has not heard of any flooded roads to this point but drainage areas are likely experiencing flooding. If you are driving through Fayette County Iowa, use caution and never cross flooded sections of roads. LAT...LON 4275 9208 4308 9208 4308 9161 4274 9161 $$ Shea
410 WGUS73 KARX 211725 FFSARX Flash Flood Statement National Weather Service La Crosse WI 1225 PM CDT FRI JUL 21 2017 IAC065-211815- /O.CON.KARX.FF.W.0016.000000T0000Z-170721T1815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Fayette IA- 1225 PM CDT FRI JUL 21 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM CDT FOR FAYETTE COUNTY... At 1219 PM CDT, Doppler radar indicated as much as 2 to locally 5 inches of rain has fallen across parts of Fayette county. The heaviest rain was mainly in the Richfield to east of Sumner to Randalia, Fayette and Albany areas. Sharp rises are being reported on the Volga river and its tributaries, but so far only water in ditches has been reported. Some locations that could experience flooding include areas near Fayette, Wadena, Randalia, Waucoma Campground, Albany, Volga River State Park, Richfield and east of Sumner. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 4275 9208 4308 9208 4308 9161 4274 9161 $$ RRS
030 WGUS73 KARX 211808 FFSARX Flash Flood Statement National Weather Service La Crosse WI 108 PM CDT FRI JUL 21 2017 IAC065-211817- /O.EXP.KARX.FF.W.0016.000000T0000Z-170721T1815Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Fayette IA- 108 PM CDT FRI JUL 21 2017 ...THE FLASH FLOOD WARNING FOR FAYETTE COUNTY WILL EXPIRE AT 115 PM CDT... The heavy rain has ended. Flood waters are receding. Flash flooding is no longer expected to pose a threat. Please continue to heed any remaining road closures. LAT...LON 4275 9208 4308 9208 4308 9161 4274 9161 $$ RRS
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 9:22 AM CDT | Flash Flood Warning | ARX | Howard | 3 hr |
| Jul 21, 10:45 AM CDT | Flash Flood Warning | ARX | Chickasaw | 3 hr |
| Jul 21, 5:08 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 35 min |
| Jul 21, 5:57 PM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 48 min |
| Jul 21, 6:20 PM CDT | Severe Thunderstorm Warning | ARX | Fayette | 25 min |
| Jul 21, 6:45 PM CDT | Special Weather Statement | ARX | Clayton | 60 min |
| Jul 21, 6:54 PM CDT | Flash Flood Warning | ARX | Clayton | 15 hr |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.