Area Forecast Discussion
Issued by NWS Sioux Falls, SD

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000
FXUS63 KFSD 240512
AFDFSD

Area Forecast Discussion
National Weather Service Sioux Falls SD
1112 PM CST Fri Feb 23 2018

.SHORT TERM...(This evening through Saturday)
Issued at 413 PM CST Fri Feb 23 2018

An impressive upper level low pressure rotating across Utah and
moving into Wyoming this afternoon. This is the system that will
bring snow back into the area tomorrow. For tonight clouds will be
on the increase but other than south central SD snow is not
expected. Just a small chance in south central SD as well. With some
clear skies and lighter winds ahead of the increasing clouds lows
will be a bit chilly but should rebound through the night. There
will be a developing mid level warm front near the Missouri River
from 9-12z but still in the early stages so not expecting any
snowfall before 12z.

Everything comes together pretty quickly on Saturday morning. Will
initially be fighting a fairly stout layer of dry air from about
900mb to 700mb. There may be strong enough forcing along the 750mb
to 700mb layer just west of Interstate 29 to get a band going
before 15z, but most locations will see this dry layer collapse and
saturate from about 14z through 17z from southwest to northeast.

.LONG TERM...(Saturday night through Friday)
Issued at 413 PM CST Fri Feb 23 2018

With the focus on the short term, did not make any changes to the
extended forecast.

&&

.AVIATION...(For the 06Z TAFS through 06Z Saturday night)
Issued at 1058 PM CST Fri Feb 23 2018

Complicated weather pattern expected through the TAF period. Areas
of fog will remain a concern through the overnight hours, with
locally dense fog possible at times along and east of the James
River. After 10z, snow will spread into the Missouri Valley and
points northward through the daytime on Saturday. Low ceilings and
reduced visibility is expected in snowfall, with LIFR conditions
possible. Conditions will improve from west to east after 00z.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...Winter Weather Advisory from 6 AM to 9 PM CST Saturday for
     SDZ070-071.

     Dense Fog Advisory until 6 AM CST Saturday for SDZ038>040-
     053>056-059>062-065>071.

     Winter Weather Advisory from 6 AM to 7 PM CST Saturday for
     SDZ038-050-052-053-057>060-063>065-068-069.

     Winter Weather Advisory from 9 AM to 9 PM CST Saturday for
     SDZ039-040-054>056-061-062-066-067.

MN...Dense Fog Advisory until 6 AM CST Saturday for MNZ071-072-080-
     081-089-090-097-098.

     Winter Weather Advisory from 9 AM to 9 PM CST Saturday for
     MNZ071-097-098.

     Winter Storm Warning from noon Saturday to midnight CST Saturday
     night for MNZ072-080-081-089-090.

IA...Winter Weather Advisory from 6 AM to 9 PM CST Saturday for
     IAZ020-021-031-032.

     Dense Fog Advisory until 6 AM CST Saturday for IAZ001>003-
     012>014-020>022-031-032.

     Winter Weather Advisory from 9 AM to 9 PM CST Saturday for
     IAZ001>003-012>014-022.

NE...Winter Weather Advisory from 6 AM to 9 PM CST Saturday for
     NEZ013-014.

     Dense Fog Advisory until 6 AM CST Saturday for NEZ013-014.

&&

$$

SHORT TERM...08
LONG TERM...08
AVIATION...



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