Alert archive / Iowa / Flash Flood Warnings in 2020

Flash Flood Warning 3, NWS La Crosse, WI

June 9, 2020Fayette County, Iowa

NWS La Crosse, WI issued this flash flood warning at Jun 9, 2020, 7:03 PM CDT for Fayette County, Iowa. It was in force for 117 min. 6 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, 2020, 7:03 PM CDT (00:03 UTC)
Expired: Jun 9, 2020, 9:00 PM CDT
In force: 117 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Flood severity: None

County Fayette County, IA

The radar

The La Crosse radar (KARX), 121 km from the middle of the area, began a volume at 00:01 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, 7:10 PM CDT	FLASH FLOOD	3 S Fayette, IA	ROAD CLOSED DUE TO HIGH WATER.
Jun 9, 7:10 PM CDT	FLASH FLOOD	5 Ese Maynard, IA	90TH STREET CLOSED DUE TO HIGH WATER.
Jun 9, 7:45 PM CDT	HEAVY RAIN 2.9	Wadena, IA
Jun 9, 8:15 PM CDT	HEAVY RAIN 2.2	Arlington, IA
Jun 9, 8:16 PM CDT	HEAVY RAIN 4.5	3 Ene Randalia, IA	STORM TOTAL.
Jun 9, 8:51 PM CDT	HEAVY RAIN 4.5	West Union, 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, 0.1 hours before the alert went out and 168 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 104 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 582 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 203 m²/s²
0-3 km storm-relative helicity: 260 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

671 
WGUS53 KARX 100003
FFWARX
IAC065-100200-
/O.NEW.KARX.FF.W.0003.200610T0003Z-200610T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
703 PM CDT Tue Jun 9 2020

The National Weather Service in La Crosse has issued a

* Flash Flood Warning for...
  Eastern Fayette County in northeastern Iowa...

* Until 900 PM CDT.

* At 701 PM CDT, emergency management reported road closures in and 
  around the city of Fayette. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Emergency management.

  IMPACT...Flooding of small creeks and streams, urban areas, 
           highways, streets and underpasses as well as other 
           drainage and low lying areas.

* Some locations that will experience flooding include...
  West Union, Fayette, Elgin, Clermont, Arlington, Stanley, Wadena,
  Eldorado.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4264 9181 4308 9191 4308 9161 4264 9161

FLASH FLOOD...OBSERVED

$$

Baumgardt

1 follow-up statement

363 
WGUS73 KARX 100054
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
754 PM CDT Tue Jun 9 2020

IAC065-100200-
/O.CON.KARX.FF.W.0003.000000T0000Z-200610T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fayette IA-
754 PM CDT Tue Jun 9 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR
EASTERN FAYETTE COUNTY...

At 750 PM CDT, emergency management reported flash flooding. Many 
roads near the city of Fayette had water covering them. Flash 
flooding is ongoing.  

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Emergency management.

IMPACT...Flooding of small creeks and streams, urban areas, 
         highways, streets and underpasses as well as other drainage 
         and low lying areas.

The rain is coming to an end and an improvement in the flooding is 
expected as the evening continues. However, it will take some time, 
be very careful driving tonight. Rivers and creeks are on the rise! 

Some locations that will experience flooding include...
West Union, Fayette, Elgin, Clermont, Arlington, Stanley, Wadena,
Eldorado, and Highways 3 And 187.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4264 9181 4308 9191 4308 9161 4264 9161

FLASH FLOOD...OBSERVED

$$

Baumgardt

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 9, 7:51 PM CDT	River Flood Warning	ARX	Winneshiek	37 hr
Jun 9, 7:51 PM CDT	River Flood Warning	ARX	Clayton	56 hr
Jun 9, 7:51 PM CDT	River Flood Warning	ARX	Clayton	61 hr
Jun 9, 9:02 PM CDT	Areal Flood Warning	ARX	Chickasaw, Fayette, Winneshiek	27 hr

Nearby

Flash Flood Warnings in Iowa, 2020 Every flash flood warning in 2020

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.