Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 182310

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
510 PM MDT Wed Apr 18 2018

.DISCUSSION...(This Evening Through Wednesday)
Issued at 144 PM MDT Wed Apr 18 2018

An upper low is spinning over IA, while another low is
moving into the Pac NW, with ridging in between. Stratus is
gradually shifting eastward out of the CWA, but some cumulus has
spread across western SD and northwestern WY. Light rain showers
have developed along a stationary boundary, stretching north to
south across western SD. Winds are northwesterly around 10 to 15
mph, and temperatures are rising into the 40s and 50s.

As the upper ridge axis crosses the northern plains, weather will be
dry tonight into Thursday.  Conditions will be favorable for fog
development across mainly south central SD tonight. Temperatures on
Thursday will warm into the 50s, and southeasterly winds will
become breezy ahead of approaching low pressure to the south.

Upper low will swing into the Four Corners region by Friday morning,
and models continue to show a southerly track, keeping most of
the precip south of the CWA. The GFS is more robust than the ECMWF
and Canadian in its expansion of precip across the area.
Temperatures still look warm enough for rain, although a little
light snow will be possible in the Hills.

A mild and dry weekend is expected between systems. Then an upper-
level wave will cross the northern plains Monday, bringing some
light rain, which may change to snow overnight.


.AVIATION...(For the 00Z TAFS Through 00Z Thursday Evening)
Issued At 510 PM MDT Wed Apr 18 2018

Patchy BR/FZFG may develop across portions of the SD plains,
particularly across south central SD, late tonight through
Thursday morning. However, this should remain well east of KRAP.

Otherwise, VFR conditions are expected across the area through the
TAF period. Gusty southeasterly winds are anticipated Thursday
afternoon, with occasional gusts of 30-35 kt possible over
northeastern WY.




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