Area Forecast Discussion
Issued by NWS La Crosse, WI

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FXUS63 KARX 130539

Area Forecast Discussion
National Weather Service La Crosse WI
1139 PM CST Sun Feb 12 2017

.SHORT TERM...(Tonight through Wednesday)
Issued at 130 PM CST Sun Feb 12 2017

Models in lock-step with dropping a bit of upper level energy
southeast from Canada, spinning it across northern parts of the
region Monday night. Northeast-southwest running x-section across
the forecast area shows little/if any saturation to play with, and
don`t expect much impact locally from the shortwave - perhaps some
snow chances across northern WI.

Another, stronger shortwave will drop southeast across the northern
Great Lakes Tuesday, sliding east toward the New England states for
Wed. Some qg convergence in the 700:300 mb layer, along with
frontogenetic forcing on the leading edge of the wave. The bulk of
the better/deeper forcing is currently progged to move across
northern/eastern WI. Again, saturation an issue. Same x-section
shows some increase in mostly sub 850 mb moisture across the local
area, with the deeper, more pcpn-supportive rh well north-east.
Maybe some small pcpn chances along/east of I-94, but rest of the
area looks dry at this time.

.LONG TERM...(Thursday through Sunday)
Issued at 130 PM CST Sun Feb 12 2017

Its all about the heat.

Strong upper level ridging slated to build in from the Plains for
next weekend, with the ridge axis overhead by 18z Fri, slipping east
Sat. A lot of unseasonably warm air slated to accompany the ridge
with 850 mb temps progged to max out around +10 C or so. NAEFS 850
mb temp anomalies hover from +1 to +2 for the weekend. Snow cover
roughly 1 to 6 inches across the forecast area, and expect a lot (if
not most) of that to melt off over the next several days. With skies
looking mostly sunny for the weekend, and eliminating the snow cover,
the setup is ripe for highs more reminiscent of early April rather
then mid February. The EC is a lot more aggressive with its warming,
suggesting some 60 degree temps are possible. The GFS is 10 degrees
colder while also showing quiet a spread in its ensemble members
(for instance,  from 51 to 30 for highs on Sat at La Crosse).
Either way, much above normal. Will start with the model blend
for temps, but increase a bit toward the warm EC.


.AVIATION...(For the 06Z TAFS through 06Z Monday night)
Issued at 1139 PM CST Sun Feb 12 2017

High pressure centered over Kansas this evening will move
southeast into the Ohio River Valley through Monday evening.
Behind this high, a short wave trough will drop out of Canada
Monday afternoon and move across the Great Lakes during the
evening with an area of low pressure moving across Ontario. This
incoming system is not expected to have much of a sensible impact
on the weather as the deeper moisture for lower ceilings and
precipitation will stay well to the northeast of both airports.
This will allow the VFR conditions to continue with the winds
coming around to the south/southwest on the back side of high
Monday morning with speeds increasing to around 10 knots.




LONG TERM....Rieck
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