Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 242055

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
255 PM MDT Tue Apr 24 2018

.DISCUSSION...(This Evening Through Tuesday)
Issued at 255 PM MDT Tue Apr 24 2018

Current surface analysis shows low pressure over central IA, with
cold front stretching southwest into the Southern Plains. Upper
level analysis now shows trough axis over southern SD into NE,
sliding slowly to the southeast. KUDX radar shows lingering areas
of light rain across far southwest into south central SD, with
some snow likely mixed in over the higher elevations of southwest
SD. Clearing is slowly building south across northeast WY and
western SD as drier air filters in from the northwest. Temps this
hour are mostly in the 40s, with some 30s over the higher Black
Hills and parts of southwest SD. Brisk north to northwest winds
continue to the east and southeast of the Black Hills.

Areas of light rain will linger across far southwest into south
central SD late this afternoon into this evening, exiting the area
by late evening. Winds will also decrease this evening, turning to
the west and southwest in most areas later tonight. Temps will drop
to the mid 20s to mid 30s overnight.

Warmer air will return for Wednesday 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 Wednesday night and early Thursday, bringing isolated
to scattered rain and snow showers to mainly northeast WY, the Black
Hills, and southwest SD. Cold front will bring gusty winds and some
cooler temperatures for late Wednesday night and Thursday.

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 18Z TAFS Through 18Z Wednesday)
Issued At 1130 AM MDT Tue Apr 24 2018

MVFR/IFR conditions will improve this afternoon as rain and snow
exit the area. Skies will clear, and conditions will improve to
VFR. Breezy northwesterly winds will decrease and become
southwesterly tonight.




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