Area Forecast Discussion
Issued by NWS Rapid City, SD

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998
FXUS63 KUNR 241051
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
451 AM MDT Sun Sep 24 2017

.DISCUSSION...(Today Through Saturday)
Issued at 250 AM MDT Sun Sep 24 2017

Water vapor shows upper trof across the Rockies with low spinning
over Utah. Widespread showers currently east of the Black Hills
with showers/drizzle across northeast Wyoming and western South
Dakota. Temperatures in the lower to middle 30s in the higher
elevations of the Black Hills may support some snow, but any
accumulations are light. Weak shortwave ejects from the upper
trof today. Heaviest precipitation shifts east of the forecast
area as frontal boundary remains along the MN/SD border into
western Kansas. However, light showers/drizzle will be fairly
widespread much of the day. Temperatures similar to yesterday.
Upper low over Utah weakens and moves into Wyoming on Monday, with
scattered showers across the area. May be some light snow in the
Black Hills tonight, with minor accumulation possible above 6500
ft MSL.

Upper trof moves east of the are on Tuesday, with drier northwest
flow across the northern plains. Temperatures will warm to near
average for the last half of the week.

&&

.AVIATION...(For the 12Z TAFS Through 12Z Monday Morning)
Issued At 449 AM MDT Sun Sep 24 2017

Widespread IFR conditions will continue through the forecast
period...with some gradual improvement to MVFR possible later
today. Some locations will see LCL LIFR conditions with areas of
fog and -SHRA...particularly across northeastern Wyoming and the
Black Hills area.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&

$$

DISCUSSION...7
AVIATION...13



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