Area Forecast Discussion
Issued by NWS La Crosse, WI

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FXUS63 KARX 261856

Area Forecast Discussion
National Weather Service La Crosse WI
155 PM CDT Sat May 26 2018

.SHORT TERM...(Tonight through Memorial Day)
Issued at 155 PM CDT Sat May 26 2018

Water Vapor imagery showing a mid-level trough rotating through the
arrowhead of MN into western Upper Michigan. Regional radar showed
convection associated with this wave was confined close to the wave
and well north of the forecast area. Otherwise, amplified ridge of
high pressure extending through the mid-section of the CONUS was
producing very warm/mostly sunny conditions across our area with
temperature readings at 1 pm well into the 80s.

For tonight, weak wind flow with high pressure overhead will provide
conditions for some fog development late. Thinking most of this fog
will be confined to river valleys. Overnight lows will be in the
upper 50s to the middle 60s.

Sunday will be a hot one as 925mb temperatures hover in the 27-30
degree range. This should translate to surface temperatures well
into the 90s. Mixing expected to keep dewpoints in the upper 50s to
lower 60s during peak heating. This will keep heat indices in the
middle and upper 90s -just shy of Heat Advisory. Also keep an eye on
the potential for some record breaking high temperatures which is
highlighted below in the climate section.

For Sunday night through Memorial Day, high pressure stays put
across the Upper Mississippi River which will keep the heat on
across our area. There will be a small chance for a few showers and
thunderstorms across northern WI as convection tries to round the
top of the ridge. Otherwise, look for highs Memorial Day well
into the 90s again with heat indices in the middle 90s to near 100.

.LONG TERM...(Monday Night through Saturday)
Issued at 155 PM CDT Sat May 26 2018

Shower/thunder chances enter the pix Tuesday into Thursday as the
ridge breaks down some, allowing some trough energy to get in from
the Plains. Temperatures will remain well above normal with highs
Tuesday in the upper 80s to lower 90s and upper 70s to middle 80s
Wednesday and Thursday.

Looks dry for Friday and saturday as high pressure re-amplifies aver
the region. Northeast to east flow will keep high temperatures in
the middle 70s to lower 80s...perfect!


.AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon)
Issued at 1226 PM CDT Sat May 26 2018

VFR conditions all around the next 24 hours as high pressure and
very warm air build into the region. Winds will generally remain
under 8 knots, though may briefly reach 10-12 knots at RST this
afternoon as skies remain mostly clear.


Issued at 708 AM CDT Sat May 26 2018

Near record high temperatures are expected through Monday. Here
are the current records for May 26/27/28:

Rochester, MN 91 in 1939, 93 in 1914, 95 in 2006
La Crosse, WI 94 in 1967, 96 in 1874, 95 in 1874




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