Area Forecast Discussion
Issued by NWS Rapid City, SD

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441
FXUS63 KUNR 182059
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
259 PM MDT Thu Oct 18 2018

.DISCUSSION...(This Evening Through Thursday)
Issued at 252 PM MDT Thu Oct 18 2018

Broad upper ridging covers the western 2/3 of the US, with a
decaying closed low centered over Utah. Skies are mostly clear
across the Northern Plains. Surface trough stretches across the
northern Plains. Temperatures at 3pm are in the upper 60s and 70s.

Upper low will weaken into an open wave tonight as it transitions
northeastward through the northern and central plains. Behind this
trough, colder air will sink into the region behind a cold front
Friday morning. With best CAA and pressure rises expected before
peak heating/mixing, not expecting northwesterly winds to be quite
as strong. Sustained winds of 20 to 25 mph with gusts near 35 mph
will be possible, below advisory criteria. Highs will cool slightly
into the mid 50s to lower 60s.

Persistent upper ridge will keep weather dry and mild through the
weekend and into early next week.  Models are indicating a more
active weather pattern returning towards the middle of next week,
with some small chances of precip.

&&

.AVIATION...(For the 18Z TAFS Through 18Z Friday)
Issued At 1048 AM MDT Thu Oct 18 2018

VFR conditions will continue through the period. Gusty southwest
winds to 40kts are expected across south central SD through the
afternoon.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...Wind Advisory until 7 PM CDT this evening for SDZ046-047-049.

WY...None.
&&

$$

DISCUSSION...15
AVIATION...Johnson



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