Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 231957

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
157 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 18Z TAFS Through 18Z Wednesday)
Issued At 1213 PM MDT Tue May 23 2017

VFR conditions are expected through Wednesday morning. Gusty
northerly winds will persist through early this evening. Across
northeast Wyoming...light winds this evening will become gusty out
of the south after 06z.


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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