Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 140531
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
1131 PM MDT Fri Apr 13 2018

.DISCUSSION...(This Evening Through Friday)
Issued at 248 PM MDT Fri Apr 13 2018

Upper level analysis has large trof across the Great Plains with
closed low across southwestern Nebraska. Large spring storm system
continues to churn across the area...with blizzard conditions
across western South Dakota and thunderstorms across southeastern
South Dakota. Regional radar shows returns across much of the
forecast area with the heaviest activity across south central SD.
At the surface, low pressure is located across southeast Nebraska
with tight pressure gradient across South Dakota. Temperatures at
3pm are in the 20s to around 30 degrees, and winds are out of the
north at 15 to 30 mph with gusts to 45 mph.

Snow will taper off from northwest to southeast across much of the
forecast area late this afternoon into tonight, along with
decreasing winds, as the now stacked low pressure system moves
into northern Missouri. The exception will be across south
central SD, where the heaviest snow will continue tonight,
tapering off Saturday morning. Blizzard warnings continue tonight
into early Saturday morning for areas south and east of the Black
Hills. Snowfall totals of 1 to 2 feet will be possible east and
southeast of the Black Hills into south central SD.

The weather for the rest of the forecast period looks relatively dry
as a ridge develops for the rest of the weekend and the first
part of next week. Temperatures will likely struggle to warm in
most areas with the new snow cover, with northeast WY likely
seeing the warmest temperatures in the near term. A shortwave
disturbance is progged to move quickly across the Northern Plains
Tuesday with a chance for rain and snow showers, along with gusty
winds. Dry conditions will return for later in the week.

&&

.AVIATION...(For the 06Z TAFS Through 06Z Saturday Night)
Issued At 1129 PM MDT Fri Apr 13 2018

Widespread LIFR conditions in +SN/BLSN will continue across
central South Dakota overnight and then slowly shift east Saturday
morning. Conditions will gradually improve overnight into
Saturday morning over northeast Wyoming and western South Dakota.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...Blizzard Warning until noon MDT /1 PM CDT/ Saturday for SDZ044-
     046-047-049.

     Blizzard Warning until 6 AM MDT Saturday for SDZ032-042-043.

WY...None.
&&

$$

DISCUSSION...15
AVIATION...Helgeson



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