Area Forecast Discussion
Issued by NWS La Crosse, WI

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441
FXUS63 KARX 292320
AFDARX

Area Forecast Discussion
National Weather Service La Crosse WI
620 PM CDT SUN MAY 29 2016

.SHORT TERM...(This evening through Monday)
Issued at 248 PM CDT Sun May 29 2016

Most immediate concern is convective chances this afternoon as an
area of MLCAPE from 1000 to 1500 J/kg interacts with an approaching
short-wave aloft. Already seeing a few isolated thunderstorms pop
up near the MN/IA border region and expect additional scattered
thunderstorms through sunset mainly along and south of the I-90
corridor. The strongest storms may be capable of producing gusty
winds up to 40 mph and small hail. For tonight, expect dry
conditions and clearing skies with temperatures dropping into the
50s. Could see some patchy fog mainly along and east of the
MS River.

Memorial Day is shaping up to be quite nice. With short-wave
ridging aloft and high pressure at the surface, expect partly
sunny skies and temperatures in the upper 70s to lower 80s. Light
westerly winds early in the day will slowly shift to the south.
Dew point temperatures will also be in the 50s, making for a less
muggy day. While there is a slight chance for showers and storms
across portions of northeast IA late in the afternoon, the vast
majority of convective activity will stay well west of the
forecast area, coincident with the best moisture transport and
instability axis across the Dakotas into the central Plains.

.LONG TERM...(Monday night through Sunday)
Issued at 248 PM CDT Sun May 29 2016

A Pacific trough ejects eastward from the northern Rockies into
the western Dakotas Monday night, lifting a warm front across the
forecast area. While deep-layer shear is weak, increasing moisture
transport along a 25 to 35 kt 850 hPa nocturnal jet combined with
some lingering mid-level instability could result in some scattered
showers and storms. Much better chance for more widespread showers
and storms will occur on Tuesday as weakening surface cold front
sweeps across the forecast area. Stronger mid-upper level flow
lags well behind the front, but with 20 to 30 kts of 0-3 km shear
and 1000 to 1500 J/kg of MLCAPE, could see a few stronger storms
during the day. This agrees well with current marginal risk from
the SPC Day 3 outlook.

Lingering showers and storms move east and out of the region on
Wednesday with drier, breezy conditions in the front`s wake. After
dry and cooler conditions Thursday/Friday, precip chances return
Friday night into the weekend as ill-resolved short-waves drop
south in northwest flow aloft with ridging building across the
intermountain west. Temperatures will be noticeably cooler
compared to recent days, but still near normal for early June with
highs generally in the mid to upper 70s.

&&

.AVIATION...(For the 00Z TAFS through 00Z Monday evening)
Issued at 620 PM CDT Sun May 29 2016

VFR conditions are expected through the TAF period. Isolated
showers will quickly end this evening with the loss of daytime
heating. Will have to watch for some patchy fog near KLSE for the
overnight hours. Otherwise, high pressure will build in tonight
into Monday morning with skies clearing. A warm front edges into
the region on Monday and we will see increasing mid level clouds
ahead of the front. A few showers and storms are possible Monday
evening as the front makes its way northeast.

&&

.ARX Watches/Warnings/Advisories...
WI...None.
MN...None.
IA...None.
&&

$$

SHORT TERM...ROGERS
LONG TERM...ROGERS
AVIATION...WETENKAMP



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