079 
FXUS63 KUNR 231952
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1252 PM MST Mon Nov 23 2020

.DISCUSSION...(This Evening Through Monday)
Issued at 1252 PM MST Mon Nov 23 2020

Progressive westerly flow will continue to become more active as 
passing upper troughs trend more amplified. However, lack of sig 
moisture combined with split flow tendencies will preclude precip 
chances most areas. Splitting long wave upper trough continues to 
advect east into the region. Gusty southerly winds continue over 
scentral SD today and will persist into the evening. Main area of 
lift and deeper moisture has trended SE, offering a dry forecast 
now for all areas in the FA, save for perhaps far SE Tripp county 
where some light snow or flurries will be possible late tonight 
into Tue morning. Sfc cold front will shift through the area 
tonight supporting breezy spots over NW SD late tonight into Tues.
CAA will offer slightly cooler conds most areas, but better 
mixing will allow temps similar to today’s numbers over NW SD. 
The next progressive trough will shift into the region Tues with 
ridging ensuing and lasting int Wed. This will support slightly 
warmer conds by Wed, after which another cold front will bring 
cooler conds for Thanksgiving Day. Another repeat ridge/trough 
will support warming conds Friday and Sat, with a stronger cold 
front Sunday. Dry weather will prevail in the period with 
currently no chances for precip into early next week. However, a 
few snow showers could be possible with any passing upper troughs 
later in the week esp. if timed with diurnal heating, just not 
high enough of a probability to mention attm.

&&

.AVIATION...(For the 18Z TAFS Through 18Z Tuesday)
Issued At 1015 AM MST Mon Nov 23 2020

VFR conditions will continue through the period.

&&

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

$$

DISCUSSION...JC
AVIATION...Johnson