Frost Advisory 9, NWS La Crosse, WI

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WWUS73 KARX 140601
NPWARX

URGENT - WEATHER MESSAGE
National Weather Service La Crosse WI
101 AM CDT Thu May 14 2026

WIZ017-029-034-042>044-141200-
/O.CON.KARX.FR.Y.0009.000000T0000Z-260514T1200Z/
Taylor-Clark-Jackson-Monroe-Juneau-Adams-
Including the cities of Tomah, Mauston, Black River Falls,
Sparta, Neillsville, Friendship, and Medford
101 AM CDT Thu May 14 2026

...FROST ADVISORY REMAINS IN EFFECT UNTIL 7 AM CDT THIS MORNING...

* WHAT...Temperatures as low as 33 will result in frost formation.

* WHERE...Adams, Clark, Juneau, Taylor, Jackson, and Monroe Counties.

* WHEN...Until 7 AM CDT this morning.

* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive 
  outdoor plants may be killed if left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

JAR

Area Forecast Discussion
National Weather Service La Crosse WI
1224 PM CDT Wed May 13 2026

.KEY MESSAGES...

- Mild and dry conditions through much of the Thursday with
  highs in the upper 60s to low 70s for today and the low to mid
  70s for Thursday.

- Widespread shower and storm chances (40 to 75%) return
  Thursday evening into the overnight. Periodic shower and storm
  chances continue through much of next week with some severe
  storm potential on Sunday and Monday to monitor.

- Temperatures warm up into the 80s for most for the weekend and
  into early next week.

&&

.DISCUSSION...
Issued at 1151 PM CDT Tue May 12 2026

Today-Thursday: Mild and Dry

A longwave trough will exit the region today followed by a brief
period of shortwave ridging on Thursday. The upper level pattern
continues to support northwest flow through this time, although the
near-surface environment begins to switch to southwesterly flow by
Thursday. Both today and Thursday are looking dry with the exception
of early Thursday evening when a shortwave trough moves into the
region and brings some rain with it. With the northwest flow aloft,
temperatures will stay relatively mild with near to slightly above
normal temperatures with highs in the low 60s to low 70s for today
and the low to mid 70s for Thursday. Northwest winds for today will
not be nearly as strong as they were for Tuesday, generally staying
in the 15 to 20 mph range with some gusts up to 25 mph possible.
Some deeper mixing could occur which could result in some wind gusts
approaching 30 mph.

Thursday Evening-Wednesday: Periodic Rain and Storm Chances, Warmer

After some shortwave ridging on Thursday morning and afternoon, a
trough dips down and brings a band of rain and storms with it
Thursday evening. There is not a whole lot of instability with this
wave, generally less than 1000 J/kg of MUCAPE. Another thing to note
is that during the overnight period there is a low level jet that
will still be quite windy, 35 to 50 kts at 850mb, and with slightly
higher instability during the overnight, this could bear some
watching, as hinted by the most recent GFS run where a second band
of precipitation develops during the overnight. Not much is expected
QPF wise, as the LREF suggests a 30 to 65% chance of more than 0.1"
falling Thursday night into Friday morning. Given how dry it has
been recently, this would be more than welcome!

Beginning on Friday and continuing through at least midweek, zonal
to southwest flow returns to the upper levels. This flow pattern
will help to bring periodic rain and storm chances as system after
system moves from the Plains into the Midwest. The only question is
how far north these systems can get. The first storm comes around on
Sunday as a warm front moves into northern Iowa. Both the
deterministic GFS and ECMWF have this warm front moving up into the
I-90 corridor. Then on Monday the associated surface low moves
through our area bringing another round of rain and storms. Both
days look to have some severe potential and the recent AI NWP
guidance highlights a low severe risk up to I-90 for Sunday and for
much of the area on Monday. The severe risk may be higher if minimal
precipitation occurs during the morning on Monday allowing for more
recovery to occur. Both of these days bear watching over the coming
days. A mostly dry Tuesday and Wednesday look to be in store for the
forecast area followed by another shot of storms on Thursday.

Temperatures from Friday through midweek will be a bit warmer than
usual. High temperatures from Friday through Monday are in the 80s
for most with some upper 80s possible. There is a 30 to 50% chance
of hitting at least 85F on Friday across much of the CWA, based on
the recent NBM, with the highest chances across northeast Iowa and
far southwest Wisconsin. Highs then dip slightly into the upper 60s
to mid 70s for midweek.

&&

.AVIATION /18Z TAFS THROUGH 18Z THURSDAY/...
Issued at 1220 PM CDT Wed May 13 2026

VFR conditions are expected for the TAF period with a 4-7 kft CU
deck east of the Mississippi River gradually mixing out through
the afternoon. Northwest winds of 10-15G20-25kts gradually
relax through the afternoon and become light and variable this
evening. Winds increase from the SSE to the west of the
Mississippi River after 06Z to 10-15G20-25kts by midday
Thursday, with these winds not starting to increase until after
sunrise east of the river.

&&

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

&&

DISCUSSION...Cecava
AVIATION...Skow

Hazardous Weather Outlook
National Weather Service La Crosse WI
431 AM CDT Wed May 13 2026

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ032-033-041-
053>055-061-141100-
Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette-
Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston-
Buffalo-Trempealeau-La Crosse-Vernon-Crawford-Richland-Grant-
431 AM CDT Wed May 13 2026

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

.DAY ONE...Today and Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Strong to severe storms may occur along and south of Interstate 94
on Sunday and across the entire area on Monday.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed on Sunday and Monday.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

WIZ017-029-034-042>044-141100-
Taylor-Clark-Jackson-Monroe-Juneau-Adams-
431 AM CDT Wed May 13 2026

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

.DAY ONE...Today and Tonight

Scattered to areas of frost is expected tonight.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Strong to severe thunderstorms may occur on Monday.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed Monday.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

Boyne