Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 241109

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
409 AM MST Fri Feb 24 2017

.SHORT TERM...(Today Through Saturday Night)
Issued at 337 AM MST Fri Feb 24 2017

Upper level analysis has large trof over the western CONUS with
weak closed low over the Northern Plains. Skies are mostly cloudy
across the Northern Plains with light snow across much of
Northeast Wyoming and southern South Dakota. Drier air is moving
in from the northeast, helping to diminish snowfall early this
morning. At the surface, high pressure resides across North Dakota
with north to northeast boundary layer flow present across the
forecast area. Temperatures at 3am have fallen into the teens to
mid 20s across the area.

Today...Upper low will slowly shift east as surface high pressure
settles across the Dakotas. Light snow will slowly diminish this
morning across parts of Northeast Wyoming and southern South
Dakota. Little additional accumulation is expected. Breezy north
winds across far south central South Dakota may produce some
patchy blowing snow through the morning hours. Some decent lapse
rates will remain across the Black Hills area through early
afternoon, so a few snow showers will be possible. Highs will be
in the 20s to lower 30s. Tonight will be the coldest it`s been
for a while, with lows in the single digits and teens.

Saturday...A quick moving upper trof will cross the area. Once
again, with moderate surface heating combined with cool air aloft,
steep lapse rates will be present. This will lead to scattered
rain/snow showers possible during the afternoon and early evening
hours. Highs on Saturday will only be in the upper 20s to upper
30s. Lows will fall into the teens.

.LONG TERM...(Sunday Through Thursday)
Issued at 337 AM MST Fri Feb 24 2017

Mostly dry weather is expected for the second half of the weekend
and into early next week, with slightly below average
temperatures in the mid 20s to mid 30s. Weak disturbances will
bring clouds and the possibility for snow showers at times. Best
chances look to be Monday night into Tuesday, and again Wednesday
night. Drier and slightly warmer weather is expected towards the
end of next week, as an upper ridge builds over the western


.AVIATION...(For the 12Z TAFS Through 12Z Saturday Morning)
Issued At 337 AM MST Fri Feb 24 2017

Snow with IFR/LIFR conditions will continue across southern parts
of Northeast Wyoming through much of southern South Dakota through
18Z. Conditions will gradually improve late this morning from
north to south as snow tapers off and moves out of the forecast
area. Mainly VFR conditions are expected this afternoon with the
exception of some rain/snow showers across the Black Hills area
this afternoon.




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