Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 180505

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1105 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 06Z TAFS Through 06Z Wednesday Night)
Issued At 1105 PM MDT Tue Apr 17 2018

SHRA, and particularly SHSN, will persist over portions of the SD
plains overnight. Within SHSN, MVFR/IFR cigs/vsbys can be
expected. This activity will gradually diminish through the
overnight period, though continued SHSN will be possible across
far eastern portions of the area (roughly east of a KHEI-KVTN
line) through early Wednesday afternoon. Elsewhere, VFR conditions
are expected through Wednesday evening.

Overnight Wednesday, MVFR cigs will gradually develop over the SD
plains. For now, it appears this will not impact KRAP through
the current TAF period.




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