Area Forecast Discussion
Issued by NWS La Crosse, WI

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285
FXUS63 KARX 212308
AFDARX

Area Forecast Discussion
National Weather Service La Crosse WI
608 PM CDT Sat Apr 21 2018

.SHORT TERM...(This evening through Sunday)
Issued at 208 PM CDT Sat Apr 21 2018

At 2 PM, a 1032 mb surface high continued to provide light winds
and dry weather across the Upper Mississippi River Valley. A band
of 700 to 500 mb frontogenesis was producing clouds south of
Interstate 94. Meanwhile, skies were mostly sunny to sunny across
the remainder of the region. Temperatures were in the mid and
upper 40s over the snow pack across southeast Minnesota and
northeast Iowa and in the 50s elsewhere.

As the 700-500 mb frontogenesis weakens tonight and Sunday
morning, the skies will gradually clear. Low temperatures will
range from the mid 20s to mid 30s. With more sunshine expected on
Sunday, high temperatures will be a bit warmer. They will range
from the mid 50s to mid 60s.

.LONG TERM...(Sunday night through Saturday)
Issued at 208 PM CDT Sat Apr 21 2018

With abundant sunshine and 925 mb temperatures around 12C, the
high temperatures on Monday will warm into the 60s. There may be
even be a few lower 70s in the river valleys if we happen to mix
a bit deeper in the afternoon.

For Tuesday, the GFS continues to produce some light rain during
the afternoon. Meanwhile, the ECMWF, Canadian, and NAM are showing
no phasing between a northern and southern stream system. As a
result, they keep the area dry. Started to trend the forecast dry
by holding onto slight chance precipitation probabilities over far
western portions of southeast Minnesota and northeast Iowa and
north of Interstate 94 in Wisconsin. In the wake of this front,
colder air will spill back into the area. High temperatures on
Wednesday and Thursday will be in the 50s.

On Thursday afternoon and evening, another Canadian cold front
will move through the region. This lift and saturation looks much
better along and ahead of this front, so this looks to be our best
chance of rain during the next week.

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday evening)
Issued at 608 PM CDT Sat Apr 21 2018

VFR ceilings in the 8-12 kft agl layer this evening will gradually
drift southward, resulting in mostly clear/sunny skies for the
remainder of the period. Winds will be light and variable if not
calm at both TAF airfields this evening and overnight, but will
increase slightly from the east-southeast Sunday morning and
continue through the rest of the period.

&&

.HYDROLOGY...
Issued at 208 PM CDT Sat Apr 21 2018

Flood warnings are in effect for the Trempealeau River at Dodge
and the Kickapoo River at Viola, Readstown, and Gays Mills with
minor flooding expected late this weekend into next week. See the
latest flood statements for more information.

As the recent snow melts and runs off into area streams,
additional flooding will be possible, especially along the
Mississippi River at Wabasha with additional details in the
latest hydrologic statement.

&&

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

$$

SHORT TERM...Boyne
LONG TERM...Boyne
AVIATION...Rogers
HYDROLOGY...Boyne



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