Area Forecast Discussion
Issued by NWS Twin Cities, MN

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FXUS63 KMPX 280936
AFDMPX

Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
436 AM CDT THU JUL 28 2016

.SHORT TERM...(Today and tonight)
Issued at 430 AM CDT Thu Jul 28 2016

A rather gloomy day is in store for today, with low clouds expected
to stick around most of the day from south central into eastern MN
and western WI. In fact, no substantial clearing is expected until
overnight when skies should begin to clear out from north to south,
though that clearing looks to only come to roughly the northern half
of the MPX area. For the southern half of the area, it will likely be
well into Friday before clouds finally break up. The reason for the
gloominess is that we find ourselves in a broad positively tilted
trough with several weak disturbances within it and we do not look
to fully cleanse ourselves of this trough until Sunday.

With clouds, it will also be cool and expect highs to only top out
in the upper 60s and lower 70s where low clouds dominate the day,
with some filtered sun allowing highs in the upper 70s to around 80
out in western MN.

Besides the low clouds, southeast MN and adjoining portions of WI
will have to deal with on and off light rain showers and drizzle
through the day. This is the result of a weak h7 low that will be
drifting from NW WI toward SE MN today. This h7 low will interact
with an inverted trough at the surface that will be extending up
from La Crosse to the Twin Cities, which will aid in the
shower/drizzle development through the day. Forecast soundings show
moist adiabatic soundings and little instability and reflectivity
forecasts produced by the CAMs struggle to produce any reflectivity
above 50 dbz, so removed any thunder mention from the forecast and
stuck with just a chance of shower wording.

.LONG TERM...(Friday through Wednesday)
Issued at 430 AM CDT Thu Jul 28 2016

Friday and Saturday will feature more sunshine than today, so we
expect a slow warming trend through the weekend, but near climate
normals. The time/height cross sections of relative humidity from
the 29.00/06Z guidance show very little moisture through the
depth of the atmosphere after today and for at least the first
half of the weekend. Although - fair weather cumulus are likely
given the cooler temperatures at 850mb. More moisture and warmer
temps begin to advect into MN/WI on Sunday, but the deeper
moisture and high humidity doesn`t return until Mon-Tue when a
surface low takes shape in the Central Plains and locally we get a
stronger S-SE flow regime. The next notable chance for rain
/potentially heavy/ looks to occur Monday night and Tuesday
morning near a warm front that will be stretched out across MN/WI.
The GFS/ECMWF have another wave passing through Wednesday night.
Overall big picture...a warm and moist pattern looks to be in
play next week.

&&

.AVIATION...(For the 06Z TAFS through 06Z Thursday night)
Issued at 1201 AM CDT THU JUL 28 2016

An upper low will slowly head southeast across WI through the
period with an inverted trough stretching northwest into east
central MN and west central WI. This should facilitate frequent
periods of MVFR/IFR cigs in these areas through at least early
Thursday afternoon, with some improvement possible late as drier
air moves in from the north. Scattered showers will persist in
this area through Thursday. STC will be on the western edge of
these cigs. AXN/RWF will likely remain VFR through the period.

KMSP...MVFR cigs finally firmly in place with IFR cigs not too
far to the north. Cigs will lower to IFR shortly after 06z. Visibility
should be unrestricted with 15-25 kt winds just above the surface.

/OUTLOOK FOR KMSP/
Fri...Chc MVFR early. Winds E 5 kts.
Sat...VFR. Winds SE 5 kts.
Sun...VFR. Winds SE 5-10 kts.


&&

.MPX Watches/Warnings/Advisories...
WI...None.
MN...None.
&&

$$

SHORT TERM...MPG
LONG TERM...CLF
AVIATION...BORGHOFF



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