Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 232309

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
509 PM MDT Tue May 23 2017

.DISCUSSION...(This Evening Through Tuesday)
Issued at 152 PM MDT Tue May 23 2017

Upper low has shifted over southern MN/northern IA, with a 100 kt
jet in northerly flow over the western Dakotas. Skies are
becoming increasingly cloudy across the CWA, as cumulus develops.
Radar is showing a few weak echoes across portions of southwestern
SD. A surface high stretches across WY/MT. Winds across the CWA
are northwesterly 10-20 kts, and temps are around 60.

As the upper level ridge shifts into the northern plains tonight,
and the surface high moves into the central Dakotas, winds will
become light and skies will clear. Temperatures across the
southwestern and central SD plains will dip into the low to mid 30s,
and frost is expected to develop by morning. Have issued a Frost
Advisory for those places. Areas farther west should be warm enough
to avoid frost.

The upper ridge will result in a mild and dry Wednesday, with highs
in the 70s to lower 80s. A Canadian low pressure system will drag a
cold front through the region early Thursday, and highs will cool
into the 60s and lower 70s. Near to slightly below normal
temperatures will last through the weekend, along with on and off
chances for showers and thunderstorms as the low slowly meanders
through the northern CONUS.


.AVIATION...For the 00Z TAFS Through 00Z Wednesday Evening
Issued At 504 PM MDT Tue May 23 2017

Flat cumulus clouds over western-central SD will dissipate by 02Z,
leaving clear skies. Cirrus cloud cover advancing over
northeastern WY. Gusty north winds will decrease during the
evening, with light winds until mid morning, when winds will
become southeast. Light and variable winds over northeastern WY
will become gusty from the south after 06z, then shift to the
southwest Wed afternoon.


SD...Frost Advisory from 3 AM MDT /4 AM CDT/ to 7 AM MDT /8 AM CDT/
     Wednesday for SDZ014-031-032-042>044-046-047-049.



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