Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 251056

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
456 AM MDT Wed Apr 25 2018

.DISCUSSION...(Today Through Tuesday)
Issued at 324 AM MDT Wed Apr 25 2018

Upper level analysis has shortwave ridge across the Northern
Plains with decaying closed low across Nebraska and broad low
amplitude trof approaching the Pacific Northwest. Skies across the
Northern Plains are mostly clear. At the surface, high pressure
resides across the area with light winds. Temperatures at 3am are
mainly in the upper 20s and 30s.

Warmer air will return today as shortwave ridge quickly passes
over the area. Highs will be in the 60s to around 70 degrees with
south to southwest winds increasing, especially across northeast
WY. A shortwave trough will move quickly southeast across the area
late tonight and early Thursday, bringing isolated to scattered
rain and snow showers to mainly northeast WY, the Black Hills, and
southwest SD. Strong cold front will bring gusty winds to the area
overnight and remain breezy into Thursday. Temperatures will be
cooler again on Thursday, with highs in the 50s to around 60

Friday into early next week looks to be mainly dry and pleasantly
warm as high amplitude ridge builds over the Rockies and moves east
across the plains. Highs over the weekend will be in the 70s to
around 80 degrees on the plains. A large trough is progged to move
over the western US late in the weekend into early next week, with
southwest flow developing over the Rockies into the plains. Will
likely start to see some chances for showers and a few thunderstorms
by Monday, continuing into the middle part of next week.


.AVIATION...(For the 12Z TAFS Through 12Z Thursday Morning)
Issued At 451 AM MDT Wed Apr 25 2018

VFR conditions expected through this evening. A cold front will
move through late this afternoon/early evening with a period a
gusty northwest winds. Scattered rain showers expected across
northeast Wyoming into the Black Hills tonight, with the rain
possibly mixed with snow in the Black Hill. MVFR conditions
possible with the showers, especially around the Black Hills.




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