Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 141124
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
524 AM MDT Sat Apr 14 2018

.DISCUSSION...(Today Through Friday)
Issued at 320 AM MDT Sat Apr 14 2018

Current surface analysis shows low pressure associated with the
exiting storm system is centered over northwest MO. Weak high
pressure is located over western ND. Upper level analysis shows
low pressure over eastern NE. Pcpn continues to wrap around the
low across eastern SD into central SD. The back edge of the
snowfall right now is east of a line from Philip to Martin. The
strongest winds are across south central SD and points to the
south and east. Gusts to 50 mph have been noted at Winner the last
couple of hours, with blizzard conditions continuing across the
area. Further west, skies are mainly cloudy across western SD,
with some clearing starting to move into northeast WY. Temps are
in the upper teens to mid 20s.

The storm system will continue to move slowly east across the east-
central plains today. Blizzard conditions will persist across south
central SD through at least the early morning hours, with snow
tapering off by late morning and winds slowly diminishing by the
afternoon. Skies will gradually clear from west to east across
northeast WY and far western SD through the morning hours, and
across areas further east during the afternoon and early evening.
Colder air will remain in place across much of the area, and
combined with the new snow cover, temperatures will struggle to rise
much above freezing across western SD. Milder air advecting into
northeast WY along with less snow cover will allow temps to rise
into the 40s.

Milder air will continue to build into the region Sunday and Monday
as a ridge builds across the Rockies and into the Plains. Should see
a wide range of temperatures across the area each day, with
northeast WY being the warmest. Highs on Monday will likely range
from the 40s across far northwest and central SD to near 70 across
western portions of northeast WY.

The next system will cross the region Tuesday into early Wednesday
as a compact upper low moves relatively quickly across the Northern
Plains. Cold front will cross the area early Tuesday, with gusty
winds developing in some areas behind it on Tuesday. Showers will
likely be scattered in nature with the system and mostly in the form
of rain. However, some snow showers look possible across northeast
WY, the Black Hills, and northwest SD, late Tuesday and Tuesday
night. Another strong system digging across the western US mid to
late week could bring more significant rain and snow for next Friday
into the first part of the weekend.

&&

.AVIATION...(For the 12Z TAFS Through 12Z Sunday Morning)
Issued At 519 AM MDT Sat Apr 14 2018

N-S oriented band of IFR CIGS over northeastern Wyoming will
improve to VFR by 16Z this morning. Area of IFR conditions in snow
and blowing snow over south central South Dakota will improve to
VFR by 20Z this afternoon. Otherwise, VFR conditions will prevail.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...Blizzard Warning until noon MDT /1 PM CDT/ today for SDZ044-046-
     047-049.

     Blizzard Warning until 6 AM MDT early this morning for SDZ043.

WY...None.
&&

$$

DISCUSSION...26
AVIATION...10



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