Area Forecast Discussion
Issued by NWS Twin Cities, MN

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

307
FXUS63 KMPX 110050
AFDMPX

Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
650 PM CST Sat Dec 10 2016

.SHORT TERM...(This evening through Sunday)
Issued at 325 PM CST Sat Dec 10 2016

Short term concerns are snow amounts and headlines through
Sunday.

Updated earlier to expand the advisory farther to the north...from
Morris...St Cloud east into west central Wisconsin and south across
southern Minnesota.  Looking at overall QPF trends...it still looks
like around one half inch across south central Minnesota...with
about one quarter inch over the far north.  Taking into account
overall SLR`s of around 20:1 to the north and around 15:1 far
south....we should see 6 to 8 inch snow accumulations into south
central MN with 3 to 6 inches over the north...over a 24 to 36 hour
period. Surface winds will be negligible for the period of snow
fall...and pick up some in the wake of the surface low into western
MN Sunday afternoon.  With the snow ending...overall blowing
snow is expected to remain minimal.

We have one band of moderate snow now working into the southern
metro as initial surge of isentropic lift moves in.  The other
moderate snow band is located farther south across south central MN.
Various models lift this southern band north into the central cwa
through 06z and into the northeast cwa 06z-12z. We should  see 2-3
inch snows with this band of snow as it moves through.

Improving conditions should ensue to the west Sunday morning...but
the snow should continue falling...at least lightly through much of
the day...possible ending Sunday evening over west central Wisconsin.
With the clouds and snow...temperatures should be nearly steady this
evening...slowly warming through the lower to middle 20s through
midday.

.LONG TERM...(Sunday night through Saturday)
Issued at 325 PM CST Sat Dec 10 2016

The Arctic blast is the main headline in the long term portion of
the forecast, although there could end up being an equally as big
headline toward the end of the upcoming week; this time in the
form of another winter storm.

Medium range models are in fairly good agreement that weak high
pressure will settle in on Sunday night in the wake of the storm,
with the real surge of cold arriving in the wake of the Arctic
front that pushes through Monday afternoon and evening. Scattered
snow showers are expected to accompany the frontal passage, along
with a shift to brisk northwest winds. Temperatures will plummet
into the single digits below zero on Monday night, with wind chill
values potentially nearing advisory criteria across west central
MN early Tuesday morning. High pressure will gradually spill
southeast through most of the work week, with highs in the single
digits and sub-zero lows. While winds will settle down a bit, wind
chill advisories will remain a possibility through Thursday
morning (for west central MN locations).

The forecast for Friday into the start of next weekend is looking
increasingly interesting. Both GFS and ECMWF Models forecast an
inverted trough to nose into the mid/upper Mississippi Valley.
While timing/spatial agreement is not perfect, model agreement is
sufficient to warrant the inclusion of high chance to low likely
precip probabilities. The early progs of this system look
comparable to the Plains low archetype composite for storms which
have historically brought 6 inch or greater snowfalls to the
area. Stay tuned...

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday evening)
Issued at 638 PM CST Sat Dec 10 2016

Now that the snow has arrived, IFR conditions and continuous light
to moderate snow will continue through the morning. Most of the
TAF sites will receive 3-6" inches of snow over the next 18
hours. The most common visibility while the snow is falling will
be 3/4SM to 2SM.

KMSP...
What you see is what you get from now until about 12am-2am. Late
tonight the snow rates will likely increase and the visibility
could drop below 1SM for a few hours. The heaviest snow is most
likely between 1am-5am. Around 5" is still the most likely snow
total for the airport. If the flakes remain fine/tiny then totals
will be closer to 4", if we end up with a period of classic
dendrite flakes (big flakes), totals could be closer to 6".

/OUTLOOK FOR KMSP/
Sun...IFR/MVFR with -SN. Winds E bcmg NW overnight 5-10 kts.
Mon...MVFR/VFR. Chc -sn late. SW wind 5-10 kts. Bcmg NW 10G20
      overnight.
Tue...VFR. W wind 5-10 kts.

&&

.MPX WATCHES/WARNINGS/ADVISORIES...
WI...Winter Weather Advisory until 9 PM CST Sunday for WIZ014>016-027-
     028.

     Winter Weather Advisory until 9 PM CST Sunday for WIZ023>026.

MN...Winter Weather Advisory until 6 PM CST Sunday for MNZ050>053-
     059>063-068>070-076>078-084-085-093.

     Winter Weather Advisory until noon CST Sunday for MNZ047>049-
     054>058-064>067-073>075-082-083-091-092.

&&

$$

SHORT TERM...DWE
LONG TERM...LS
AVIATION...CLF



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.