Flash Flood Warning 5, NWS La Crosse, WI

426 
WGUS73 KARX 021024
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
524 AM CDT Thu Jul 2 2026

MNC045-055-099-021230-
/O.CON.KARX.FF.W.0005.000000T0000Z-260702T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fillmore MN-Houston MN-Mower MN-
524 AM CDT Thu Jul 2 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 AM CDT THIS
MORNING FOR FILLMORE, HOUSTON AND MOWER COUNTIES...

At 524 AM CDT, emergency management reported flooding resulting in
closed roads and difficult travel in Mower County. Between 2 and 3
inches of rain have fallen. Additional rainfall amounts of 1 to 2
inches are possible in the warned area. Flash flooding is already
occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Emergency management reported.

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...
  Austin, La Crescent, Caledonia, Preston, Chatfield, Spring Valley,
  Rushford, Grand Meadow, Harmony, Houston, Adams, Lanesboro,
  Brownsdale, Hokah, Brownsville, Wykoff, Fountain, Rose Creek,
  Rushford Village and Washington.

This includes Interstate 90 in Minnesota between mile markers 175 and
204.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4356 9305 4371 9304 4383 9267 4383 9245
      4384 9245 4385 9165 4385 9129 4384 9128
      4360 9127 4353 9245 4355 9305

FLASH FLOOD...OBSERVED

$$

NRF

Area Forecast Discussion
National Weather Service La Crosse WI
141 AM CDT Thu Jul 2 2026

.KEY MESSAGES...

- Periodic severe weather and flash flooding will be possible
  into the weekend.

&&

.DISCUSSION...
Issued at 140 AM CDT Wed Jul 2 2026

Overnight

As a shortwave trough over southern Wisconsin moves away from
the area overnight, the shower and thunderstorm coverage will
gradually decrease through 3 am and then the coverage should
once again increase as a shortwave trough moves out of southern
South Dakota and northern Nebraska and along the Minnesota and
Iowa border. This convection will likely be initially along the
Interstate 90 corridor and then gradually sink south as it
develops a cold pool.

With precipitable water values ranging from 2 to 2.5 inches and
warm cloud depths over 4 km, these storms will be highly
efficient rain producers. The 6-hour QPF ensemble probability-
matched mean from 02.06z and 02.12z has some rain totals in the
2 to 5 inch range. This could result in some flash flooding
along and south of Interstate 90.

Today and Tonight

After the morning convection, there is much uncertainty on
whether storms will redevelop during the afternoon or not. Many
of the CAMs are dry, but the HRRR and RAP13 show another round
of showers and storms developing mainly along and south of
Interstate 94. These then linger into tonight. Any severe
weather threat would be pulsey this afternoon and highly
dependent upon the potential of a mesoscale convective complex
moving into the area tonight. The main severe weather threats
would be damaging winds, large hail, and maybe isolated
tornadoes.

Like overnight, the precipitable water vapor will range from 2
to 2.5 inches and the warm cloud depths will be over 4 km. As a
result, any storms will be highly efficient rain producers. The
24-hour QPF ensemble probability-matched shows a potential for 3
to 5 inches of rain mainly south of Interstate 90.

Friday into the Issued at 140 AM CDT Wed Jul 2 2026Weekend

A frontal boundary will meander across the forecast area as
shortwave trough and surface lows move through the weekend. The
timing of these waves is rather uncertain, but as they move
through the region the 0-3 km and 0-6 km shear will increase
ahead of them and this will provide a chance of supercells and
bow echos.

Precipitable water values will remain around 2 inches through
the 4th and then gradually decrease to around 1.5 inches as the
boundary finally shifts south. Warm cloud layer depths will
remain around 4 km. This will result in additional rounds of
heavy rain. Flood watches may eventually be needed.

&&

.AVIATION /06Z TAFS THROUGH 06Z FRIDAY/...
Issued at 140 AM CDT Wed Jul 2 2026

Scattered showers and storms will continue for the TAF sites
through at 02.14z. Ceilings and visibilities will occasionally
be IFR/MVFR with thunderstorms.

&&

.HYDROLOGY...
Issued at 140 AM CDT Wed Jul 2 2026

During the evening, rainfall totals were up to 3 inches. With
precipitable water values ranging from 2 to 2.5 inches and
warm cloud depths over 4 km, these storms will be highly
efficient rain producers. The 6-hour QPF ensemble probability-
matched mean from 02.06z and 02.12z has some rain totals in the
2 to 5 inch range. This could result in some flash flooding
along and south of Interstate 90.

Through at least July 4, precipitable water values will remain
around 2 to 2.5 inches and warm cloud layer depths will be
around 4 km. This will result in additional rounds of heavy
rain. Flood watches may eventually be needed.

&&

.ARX WATCHES/WARNINGS/ADVISORIES...
WI...None.
MN...None.
IA...None.

&&

DISCUSSION...Boyne
AVIATION...Boyne
HYDROLOGY...Boyne

Hazardous Weather Outlook
National Weather Service La Crosse WI
301 AM CDT Thu Jul 2 2026

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-031100-
Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette-
Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston-
Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-
Adams-Vernon-Crawford-Richland-Grant-
301 AM CDT Thu Jul 2 2026

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

.DAY ONE...Today and Tonight

Periodic storms will occur through mid-morning and then they could
potentially redevelop this afternoon and tonight. Some of the
storms may become severe this afternoon and tonight. The main
threats will be damaging winds, hail, isolated tornadoes, and
heavy rain.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

The threat for severe thunderstorms and flooding continues on
Friday and possibly into the weekend.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed periodically into the weekend.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

Boyne

Preliminary Local Storm Report
National Weather Service La Crosse WI
1040 PM CDT Wed Jul 1 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0740 PM     Tornado          1 S Stacyville          43.42N 92.78W
07/01/2026                   Mitchell           IA   Storm Chaser

            Storm chaser video evidence of a brief
            tornado that caused minor tree damage.

&&

Preliminary Local Storm Report
National Weather Service La Crosse WI
1131 PM CDT Wed Jul 1 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1028 PM     Tstm Wnd Dmg     Ontario                 43.73N 90.59W
07/01/2026                   Vernon             WI   Emergency Mngr

            Power line down in Ontario. Time estimated
            from radar.

&&