Opal, South Dakota Weather Forecast Discussion

219
FXUS63 KUNR 211108
AFDUNR
Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
508 AM MDT Sun Sep 21 2025
.KEY MESSAGES...
-Sunny and warm today
-Cool front will bring breezy winds and a few showers to the area
 Monday
-Dry with above normal temperatures mid-week on
&&
.DISCUSSION...(Today Through Saturday)
Issued at 1256 AM MDT Sun Sep 21 2025
Upper ridge ahead of the Pac NW upper trough will support sunny
and warm conds today. After this trough passes through the region,
blocking ridge will build into the region, supporting dry and
warm weather. Clear skies and light winds across the FA this
morning. Moist easterly upslope flow may allow for a few areas of
fog this morning on the SD Plains. Otherwise, sunny and dry
weather can be expected today with highs in the 70s and 80s. Upper
trough will dive SE into the central Rockies Monday, forcing a
cold front into the region. Models have shifted the track of this
system further SW, the result of which has decreased rain chances
locally, with the best rain chances SW of the FA. Still expecting
isolated showers across the area, mainly south of I90, with some
thunder possible across scentral SD. Gusty northwest of 25 to 40
mph are likely on the SD Plains, breeziest east of the Black
Hills. Rain chances shift south Monday night, with dry weather
expected the rest of week. Upper ridge will build across the
Northern Plains as a quasi-omega block develops, with dry weather
and above normal temps looking likely across the region. Highs
will generally be in the 70s and 80s with mostly clear skies.
&&
.AVIATION...(For the 12Z TAFS Through 12Z Monday Morning)
Issued At 507 AM MDT Sun Sep 21 2025
Patchy fog is possible on the SD Plains this morning. Otherwise,
VFR conds through the period.
&&
.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&
$$
DISCUSSION/KEY MESSAGES...JC
AVIATION...JC

NWS UNR Office Area Forecast Discussion