Alert archive / Iowa / Flash Flood Warnings in 2016

Flash Flood Warning 20, NWS La Crosse, WI

August 23, 2016Winneshiek County, Iowa

NWS La Crosse, WI issued this flash flood warning at Aug 23, 2016, 10:11 PM CDT for Winneshiek County, Iowa. It was in force for 4 hr. 9 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
Aug 23, 2016, 10:11 PM CDT (03:11 UTC)
Expired
Aug 24, 2016, 2:15 AM CDT
In force
4 hr
Issued by
NWS La Crosse, WI
Area
Storm-based polygon
Flood severity
None

County Winneshiek County, IA

The radar

The La Crosse radar (KARX), 89 km from the middle of the area, began a volume at 03:13 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

TimeReportWhereRemark
Aug 23, 11:06 PM CDTFLOODCalmar, IACREEKS STARTING TO OVERFLOW. LOTS OF STREET FLOODING IN TOWNS AROUND THE COUNTY.
Aug 23, 11:25 PM CDTFLASH FLOODCalmar, IAREPORTS OF A BASEMENT COLLAPSE FROM RISING WATER AROUND COMMUNITY
Aug 23, 11:25 PM CDTFLASH FLOODCalmar, IAREPORTS OF A BASEMENT COLLAPSE FROM RISING WATER AROUND COMMUNITY.
Aug 23, 11:38 PM CDTFLASH FLOOD1 S Decorah, IAWATER FLOODED CAR IN OLD WALMART PARKING LOT ON SOUTH SIDE OF TOWN
Aug 23, 11:38 PM CDTFLASH FLOOD1 S Decorah, IAWATER FLOODED CAR IN OLD WALMART PARKING LOT ON SOUTH SIDE OF TOWN.
Aug 23, 11:38 PM CDTFLASH FLOOD3 Ese Decorah, IAHOMES ALONG CEDAR VALLEY ROAD OUTSIDE OF FREEPORT MAY NEED TO BE EVACUATED WITH RISING WATER.
Aug 23, 11:40 PM CDTFLASH FLOODFort Atkinson, IAROGERS CREEK FLOODING AND OTHER AREA SECONDARY ROADS BECOMING FLOODED.
Aug 23, 11:49 PM CDTFLASH FLOOD3 E Decorah, IARIVER ROAD CLOSED NEAR FREEPORT DUE TO RISING WATER
Aug 23, 11:49 PM CDTFLASH FLOOD3 E Decorah, IARIVER ROAD CLOSED NEAR FREEPORT DUE TO RISING WATER.

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, 3.2 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.

Skew-T log-pSkew-T log-p diagram, Davenport, at 00:00Z on 2016-08-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 83 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2016-08-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
83 J/kg
Mixed-layer CIN
-226 J/kg
Mixed-layer LCL
974 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
201 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

714 
WGUS53 KARX 240311
FFWARX
IAC191-240715-
/O.NEW.KARX.FF.W.0020.160824T0311Z-160824T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
1011 PM CDT TUE AUG 23 2016

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WINNESHIEK COUNTY IN NORTHEASTERN IOWA...

* UNTIL 215 AM CDT

* AT 1008 PM CDT...DOPPLER RADAR AND RAIN GAGES INDICATE THAT TWO TO
  THREE INCHES OF RAIN HAVE FALLEN ACROSS MUCH OF CENTRAL AND
  SOUTHERN WINNESHIEK COUNTY. ANOTHER ONE TO TWO INCHES ARE POSSIBLE
  WITH ADDITIONAL STORMS THROUGH MIDNIGHT. FLASH FLOODING IS
  EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... 
  DECORAH...CALMAR...OSSIAN...SPILLVILLE...FORT ATKINSON...
  RIDGEWAY...CASTALIA...JACKSON JUNCTION...GLENWOOD CHURCH...
  STATE ROAD 9 AND 245TH STREET...CONOVER...LAKE MEYER COUNTY PARK...
  HIGHWAY 52 AND COUNTY W 34...COUNTY ROADS W 20 AND A 34...
  COUNTY ROADS W 14 AND A 34...FESTINA...
  STATE ROAD 9 AND FRANKVILLE ROAD...STATE ROAD 9 AND 290TH STREET...
  COUNTY ROAD W 46 AND CENTENNIAL ROAD AND FRANKVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 4308 9208 4339 9208 4340 9161 4309 9161
      4308 9170

$$

LAWRENCE
1 follow-up statement
843 
WGUS73 KARX 240410
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1110 PM CDT TUE AUG 23 2016

IAC191-240715-
/O.CON.KARX.FF.W.0020.000000T0000Z-160824T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WINNESHIEK IA-
1110 PM CDT TUE AUG 23 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 AM CDT FOR
WINNESHIEK COUNTY...

AT 1106 PM CDT...LOCAL LAW ENFORCEMENT REPORTED HEAVY RAIN DUE TO
CONTINUING THUNDERSTORMS ACROSS MUCH OF WINNESHIEK COUNTY. RAINFALL
AMOUNTS OF TWO TO FOUR INCHES HAVE ALREADY OCCURRED...WITH AN
ADDITIONAL INCH OR TWO POSSIBLE THROUGH EARLY WEDNESDAY MORNING.
MANY STREAMS ARE ALREADY FULL AND FLASH FLOODING IS EXPECTED TO
BEGIN SHORTLY IF IT HAS NOT ALREADY BEGUN.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
DECORAH...CALMAR...OSSIAN...SPILLVILLE...FORT ATKINSON...RIDGEWAY...
CASTALIA...JACKSON JUNCTION...GLENWOOD CHURCH... STATE ROAD 9 AND 245TH
STREET...CONOVER...LAKE MEYER COUNTY PARK... HIGHWAY 52 AND COUNTY W
34...COUNTY ROADS W 20 AND A 34...COUNTY ROADS W 14 AND A 34...FESTINA...
STATE ROAD 9 AND FRANKVILLE ROAD...STATE ROAD 9 AND 290TH STREET...
COUNTY ROAD W 46 AND CENTENNIAL ROAD AND FRANKVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 4308 9208 4339 9208 4340 9161 4309 9161
      4308 9170

$$

LAWRENCE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 23, 8:30 PM CDTSpecial Weather StatementARXChickasaw, Winneshiek60 min
Aug 23, 9:10 PM CDTAreal Flood AdvisoryARXAllamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more3 hr
Aug 23, 9:57 PM CDTAreal Flood WarningARXChickasaw, Floyd, Howard9 hr
Aug 24, 12:21 AM CDTFlash Flood WarningARXHoward, Mitchell4 hr
Aug 24, 1:02 AM CDTFlash Flood WarningARXAllamakee, Winneshiek6 hr
Aug 24, 2:05 AM CDTRiver Flood WarningARXWinneshiek25 hr
Aug 24, 2:05 AM CDTRiver Flood WarningARXAllamakee3 days
Aug 24, 3:36 AM CDTAreal Flood WarningARXFayette32 hr
Aug 24, 3:48 AM CDTFlash Flood WarningARXChickasaw, Howard3 hr
Aug 24, 4:11 AM CDTRiver Flood WarningARXWinneshiek17 hr
Aug 24, 4:17 AM CDTAreal Flood WarningARXHoward, Mitchell3 hr
Aug 24, 6:46 AM CDTFlash Flood Warning EmergencyARXAllamakee, Chickasaw, Howard, Winneshiek6 hr
Aug 24, 8:00 AM CDTRiver Flood WarningARXFloyd48 hr
Aug 24, 8:59 AM CDTRiver Flood WarningARXClayton4 days
Aug 24, 8:59 AM CDTRiver Flood WarningARXClayton3 days
Aug 24, 10:38 AM CDTSpecial Weather StatementARXChickasaw, Winneshiek82 min
Aug 24, 11:03 AM CDTAreal Flood WarningARXAllamakee, Chickasaw, Howard, Winneshiek24 hr

Nearby

Flash Flood Warnings in Iowa, 2016Every flash flood warning in 2016

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.