Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 172324

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
524 PM MDT Tue Apr 17 2018

.DISCUSSION...This Evening Through Tuesday
Issued at 224 PM MDT Tue Apr 17 2018

Sharp upper trof over Rockies with large band of moisture ahead of
it shifting slowly eastward toward the Plains. Surface low has
redeveloped over northeastern CO with inverted trof east of the
Black Hills. Precip moving into eastern WY this afternoon and will
spread across the forecast area overnight. With the cooler
temperatures behind the surface trof, precip will change to snow.
An isolated thunderstorm is possible over far southwestern SD this
afternoon, although CAPE values are low. Snow will exit south
central SD Wed morning, leaving dry weather through Thursday.
Another system cross the central Rockies into the Plains Friday.
Strong southerly surface gradient will bring Gulf moisture into
the area for another chance of rain showers with snow limited to
higher elevations. Another system will cross the northern Plains
Monday. Temperatures will remain slightly below normal.


.AVIATION...(For the 00Z TAFS Through 00Z Wednesday Evening)
Issued At 524 PM MDT Tue Apr 17 2018

SHRASN will continue to produce reduced cigs/vsbys across the area
this evening through the overnight period, with activity gradually
spreading and shifting eastward over the next several hours.
Given persistent northwesterly winds 15-20 kt, vsbys in any -SHSN
will drop to IFR/LIFR. RA/SN should exit northeast WY by 06z.
Activity could persist across the SD plains, particularly east of
a K2WX-KIEN line, through approximately midday Wednesday.

Aside from lingering MVFR/IFR conditions over our eastern zones,
VFR conditions are expected through the day Wednesday.




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