Flash Flood Warning 1, NWS La Crosse, WI

248 
WGUS73 KARX 040333
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
1033 PM CDT Fri Apr 3 2026

IAC005-191-MNC055-WIC063-081-123-040600-
/O.CON.KARX.FF.W.0001.000000T0000Z-260404T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allamakee IA-Winneshiek IA-Houston MN-La Crosse WI-Monroe WI-
Vernon WI-
1033 PM CDT Fri Apr 3 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1 AM CDT SATURDAY FOR 
NORTHWESTERN ALLAMAKEE, WINNESHIEK, SOUTHEASTERN HOUSTON, WESTERN 
VERNON, SOUTHEASTERN LA CROSSE AND SOUTHWESTERN MONROE COUNTIES...

At 1033 PM CDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Between 1.5 and 3 inches of rain 
have fallen. Additional rainfall amounts up to 1 inch are possible 
in the warned area. Flash flooding is ongoing or expected to begin 
shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  La Crosse, Decorah, Viroqua, Westby, Cashton, Calmar, Ossian, 
  Stoddard, Coon Valley, New Albin, Brownsville, Spillville, Fort 
  Atkinson, Ridgeway, Springville, Portland, Rockland, Ontario, 
  Wilmington and Reno.

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 4372 9059 4340 9128 4341 9131 4308 9190
      4308 9208 4330 9208 4392 9091

FLASH FLOOD...RADAR INDICATED

$$

JSB

742 
WGUS73 KARX 040554
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
1254 AM CDT Sat Apr 4 2026

IAC005-191-MNC055-WIC063-081-123-040604-
/O.EXP.KARX.FF.W.0001.000000T0000Z-260404T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allamakee IA-Winneshiek IA-Houston MN-La Crosse WI-Monroe WI-
Vernon WI-
1254 AM CDT Sat Apr 4 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 1 AM CDT EARLY THIS MORNING 
FOR NORTHWESTERN ALLAMAKEE, WINNESHIEK, SOUTHEASTERN HOUSTON, 
WESTERN VERNON, SOUTHEASTERN LA CROSSE AND SOUTHWESTERN MONROE 
COUNTIES...

Flood waters are receding. Please continue to heed remaining road 
closures.

&&

LAT...LON 4372 9059 4340 9128 4341 9131 4308 9190
      4308 9208 4330 9208 4392 9091

$$

JSB

Area Forecast Discussion
National Weather Service La Crosse WI
645 PM CDT Fri Apr 3 2026

.KEY MESSAGES...

- Storms capable of producing heavy rain spreading east-
  northeast through the forecast this afternoon mostly raise
  river flooding concerns along flashier rivers in northeast
  Iowa and western Wisconsin. Low probability (<15%) for severe
  storms this evening and tonight.

- Freezing rain in central Wisconsin locally limited to eastern
  half of counties given tight near to below freezing surface
  temperature gradient.

- Mostly dry start to next week, precipitation chances return by
  mid next week.

&&

.DISCUSSION...
Issued at 1259 PM CDT Fri Apr 3 2026

Ongoing Afternooon-Evening Storms:

Storms seen spreading northeast on radar imagery become
widespread by early evening. While a weakening trend has been
observed as storms push north, small, pea-sized hail has been
observed locally in northeast Iowa. Similar is expected through
the evening hours until eventual cyclogenesis along the low
level baroclinic boundary advects a deepening low northeast
towards the forecast area. While the accompanying tightening of
the baroclinic boundary solidifies the east wind across the
northern half of the forecast area, perpetuating the local
weakening force field, a slight jaunt north in the boundary
tonight and subsequent enhanced forcing along the accompanying cold
front spreads storm chances slightly farther north primarily
across the southern half of the forecast area tonight. Overall
local concern will be heavy rainfall causing river flooding
along flashier rivers; see Hydrology section below for further
details.

Storm Chances Tonight:

Limited instability in high resolution soundings keep overall
local storm threat low, although a quick progression to linear
mode along the accompanying cold front creates concern for
damaging winds given the fast motion. Main concern in far
southern counties from northeast Iowa into southwest Wisconsin.
While large hail can't be ruled out (5%), small hail
accompanying strongest storms will be more likely hazard.

Freezing Rain Locally In Central Wisconsin Tonight:

Freezing rain concerns in central Wisconsin return tonight as
precipitation chances push north through the afternoon/evening.
Current afternoon observations a couple degrees above freezing
expected to cool near and below freezing as the baroclinic
boundary tightens, increasing east winds and CAA. Accumulations
expected to be constrained to the eastern half of local
counties given tight below freezing temperature gradient.
Furthermore, ice accumulations expected to be limited to grassy
and elevated surfaces with highest amounts of 0.1" to 0.2"
expected.

Flurry Chances Saturday:

As the low shifts over the Great Lakes Saturday, initial light
rain chances switch to light snow and flurry chances through the
afternoon while shifting east-southeast through the forecast
area. Current high resolution forecast soundings suggest
transient low level instability from stronger low level CAA
causing short bursts of visibility reductions within these
stronger flurries. Overall accumulations expected to be minimal.

Mostly Dry Start to New Week:

By the time we get to 12Z Sunday, our area will be in northwest flow
aloft on the backside of the departing troughing regime that rotates
over Eastern Canada. With the moisture largely worked over from the
departing system, conditions should remain dry through the day on
Sunday. Moving into Monday, a shortwave impulse will work its way
through the northwest flow aloft around the Great Lakes which could
create some light snow showers across North Central Wisconsin. The
main limiting factor will be a significant lack of moisture as we
will not have had any appreciable moisture return by then. Any
accumulations, if there are any in our area, should be very light
and not impactful.

As the troughing regime finally slides off to the east, a surface
high will swing into the region during the day on Tuesday. This
should keep the forecast dry and cool through then with high
temperatures near to slightly below normal in the upper 30s to mid
40s.

Precipitation Chances Increase by Middle of Next Week:

Activity starts to ramp up by mid-week as flow becomes more
zonal aloft. A shortwave trough and corresponding surface low are
expected to drop out of British Columbia and slide across the
Northern CONUS through Thursday/Friday. As the trough and low
pressure center swing northeast back into Canada by the weekend, a
trailing cold front is progged to stall somewhere across the region.
With abundant moisture expected to pool along and south of the
frontal boundary, widespread continued precipitation chances look
increasingly likely in the zone around the boundary. Because
precipitation totals will depend heavily on the available moisture
and hence the location of the boundary, will hold off on giving any
reasonable deterministic QPF totals at this time. Overall, current
forecasts don't show anomalously high pWats to suggest
significant heavy rainfall and flooding concerns, even as PoPs
hold in the chance to likely range from Wednesday evening
onwards. Current NBM probabilities of 72 hour precipitation
totals exceeding 1 inch from Thursday through Saturday sit in
the 50-70% range which supports the current notion that a
healthy rainfall is expected for the late week timeframe.
Temperatures during this period look to be in the 50s to 60s,
supporting a fully rain event.

&&

.AVIATION /00Z TAFS THROUGH 00Z SUNDAY/...
Issued at 642 PM CDT Fri Apr 3 2026

Showers and scattered storms will continue for the TAF sites
throughout the evening. As storms move through the area,
visibilities will become briefly IFR/MVFR. Throughout the TAF
period, ceilings will be LIFR/IFR.

&&

.HYDROLOGY...
Issued at 1240 PM CDT Fri Apr 3 2026

Heavy rainfall accompanying storms spreading northeast through
the local forecast area early this afternoon will cover the
forecast area by the evening hours. As high resolution guidance
envelops the entirety of the forecast, higher QPF values
compared to previous forecasts suggest 1.5"+ over flooding
susceptible rivers in Wisconsin (e.g., Kickapoo, Black, Yellow)
and Iowa (e.g., Turkey). Therefore, collaborated higher QPF
forecast with WPC and NCRFC for additional river forecasts at
18Z. Given these rainfall values aligned with 80th+ percentile
QPF in previous forecasts, expect additional impacts to action
stage or minor flooding at susceptible river sites.

Overall impacts will depend on exact location of band of higher
values and subsequent drainage into flooding susceptible rivers.
While low probability (<10%), moderate flooding cannot be ruled
out should training storms repeat heavy rainfall over the same
sites.

&&

.ARX WATCHES/WARNINGS/ADVISORIES...
WI...Winter Weather Advisory until 7 AM CDT Saturday for WIZ017-029.
MN...None.
IA...None.

&&

DISCUSSION...Barendse/JAR
AVIATION...Boyne
HYDROLOGY...JAR

Hazardous Weather Outlook
National Weather Service La Crosse WI
206 PM CDT Fri Apr 3 2026

WIZ017-029-041000-
Taylor-Clark-
206 PM CDT Fri Apr 3 2026

This Hazardous Weather Outlook is for portions of central
Wisconsin and north central Wisconsin.

.DAY ONE...This Afternoon and Tonight

A Winter Weather Advisory is in effect tonight for freezing rain
causing 0.1" to 0.2" of ice accumulations.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

A Winter Weather Advisory will be in effect Saturday morning for
freezing rain causing 0.1" to 0.2" of ice accumulations.

.SPOTTER INFORMATION STATEMENT...

Ice reports would be appreciated.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

IAZ008>011-018-019-029-030-MNZ095-096-WIZ041-053>055-061-041000-
Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette-
Clayton-Fillmore-Houston-La Crosse-Vernon-Crawford-Richland-Grant-
206 PM CDT Fri Apr 3 2026

This Hazardous Weather Outlook is for portions of north central
Iowa...northeast Iowa...southeast Minnesota...southwest Wisconsin
and west central Wisconsin.

.DAY ONE...This Afternoon and Tonight

Thunderstorms expected Today and Tonight.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Heavy rainfall tonight may cause river flooding Saturday into early
next week.

.SPOTTER INFORMATION STATEMENT...

No action needed.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

WIZ033-034-042>044-041000-
Trempealeau-Jackson-Monroe-Juneau-Adams-
206 PM CDT Fri Apr 3 2026

This Hazardous Weather Outlook is for portions of central
Wisconsin and west central Wisconsin.

.DAY ONE...This Afternoon and Tonight

Thunderstorms possible Today and Tonight.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Heavy rainfall tonight may cause river flooding Saturday into early
next week.

.SPOTTER INFORMATION STATEMENT...

No action needed.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

MNZ079-086>088-094-WIZ032-041000-
Wabasha-Dodge-Olmsted-Winona-Mower-Buffalo-
206 PM CDT Fri Apr 3 2026

This Hazardous Weather Outlook is for portions of southeast
Minnesota and west central Wisconsin.

.DAY ONE...This Afternoon and Tonight

Thunderstorms possible Today and Tonight.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

No action needed.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

nofwd