Area Forecast Discussion
Issued by NWS Aberdeen, SD

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FXUS63 KABR 122123

Area Forecast Discussion
National Weather Service Aberdeen SD
323 PM CST Tue Dec 12 2017

.SHORT TERM...(This Evening through Wednesday Afternoon)
Issued at 322 PM CST Tue Dec 12 2017

The main challenges in the very near term of the forecast are winds
and precipitation chances late tonight into the day Wednesday. A
clipper low will drop out of Canada and across the far eastern
Dakotas and Minnesota tonight. Still some disagreement in the models
with the potential for precipitation, both type and amounts. The GFS
and NAM are much less aggressive with amounts, with little in the way
of accumulations, while the ECMWF and Canadian indicate up to one
tenth of an inch possible late tonight or early Wednesday morning
across the east. A few of the models hang on to lingering light
precipitation through the day as well across the far eastern CWA.
Model soundings don`t show a great potential for freezing
precipitation, but temperatures may be just below freezing at times,
so left the mention in as was indicated by the in-house model blend.
Again, amounts will be light, so impacts should be minor. A fairly
strong gradient sets up on the back side of the clipper, which will
result in very windy conditions developing from west to east late
tonight through the day Wednesday. A Wind Advisory has been issued
to account for this.

Low temperatures tonight will range from the upper 20s east to the
mid 30s west, with highs on Wednesday ranging from the mid 30s to
the mid 40s.

.LONG TERM...(Wednesday Evening through Tuesday)
Issued at 322 PM CST Tue Dec 12 2017

Northerly flow aloft will dominate the long term portion of the

The period begins with a clipper system dropping southward across
the western Dakotas. This system will bring breezy conditions, along
with a chance for snow. Like most clipper systems, this one lacks
significant moisture with minor snowfall amounts expected. Another
low pressure system will cross the region Friday night through
Saturday with light snow possible. However the latest model guidance
brings this upper level trough through most of the CWA dry.

Models are suggesting a pattern change developing early next week
with an upper level trough of low pressure moving over the Pacific
Northwest. This area should see dry and mild conditions through
the first half of next week.


.AVIATION...(For the 18Z TAFS through 18Z Wednesday Afternoon)
Issued at 1127 AM CST Tue Dec 12 2017

VFR conditions will prevail across the area this afternoon and
through the evening hours. A low pressure system will drop
southward over Minnesota late tonight, and may bring some light
precipitation to the eastern half of the CWA. KABR and KATY may be
affected by some MVFR cigs and a mix of light snow/rain, but it
would be just for a brief period of time, mainly between 06z and


SD...Wind Advisory from midnight CST /11 PM MST/ tonight to 3 PM CST
     /2 PM MST/ Wednesday for SDZ003-004-009-015-016-033>035-045-

     Wind Advisory from 6 AM to 3 PM CST Wednesday for SDZ005>008-010-

MN...Wind Advisory from 6 AM to 3 PM CST Wednesday for MNZ039-046.



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