497 
FXUS63 KUNR 242317
AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
517 PM MDT Wed Apr 24 2019

.DISCUSSION...(This Evening Through Wednesday)
Issued at 300 PM MDT Wed Apr 24 2019

Current surface analysis shows cool front now just southeast of 
the area, with brisk northwest winds across parts of the western 
SD plains. Upper level analysis shows low pressure moving across 
TX, with near zonal flow over the Rockies and northern Plains. A 
weak shortwave disturbance is moving across southeast MT and 
eastern WY, with showers and isolated thunderstorms increasing in 
coverage across northeast WY and far western SD. Temps range from 
around 60 over northeast WY to near 80 over south central SD. 

A more unsettled pattern can be expected through the forecast period 
as a series of disturbances cross the region in persistent west to 
northwest flow. Showers and a few thunderstorms will continue to 
develop and track east across much of the area late today and 
tonight, with the best chances for rainfall generally being across 
southern SD. Showers will end from northwest to southeast during the 
overnight. 

Temperatures will be a bit cooler late this week, especially by 
Friday, but still near or slightly above average. A few instability 
showers are possible across the Black Hills area Thursday afternoon. 
Winds will be breezy from the northwest Thursday and from the 
southeast on Friday. Widespread chances for showers can be expected 
Friday afternoon into Friday night as a stronger disturbance crosses 
the region. 

The weekend looks to be cool in general, with Saturday mainly dry 
between systems. The second half of the weekend will be showery as 
the next system crosses the region. Colder air is expected to move 
into the area late in the weekend, with below average temperatures 
through the first half of next week. Temperatures look cold enough 
during the overnight and morning hours for some snow showers over at 
least northeast WY and the Black Hills, likely extending into 
portions of the western SD plains as well.  

&&

.AVIATION...(For the 00Z TAFS Through 00Z Thursday Evening)
Issued At 513 PM MDT Wed Apr 24 2019

Scattered showers will continue to spread across the region this 
evening, the slowly dissipate overnight from west to east. Isolated
thunderstorms also possible mainly south of I-90 across western
SD. Mainly VFR conditions are expected, but some local MVFR CIGS 
are possible with the showers and thunderstorms especially over 
the higher terrain of the Black Hills. VFR conditions expected
areawide on Thursday.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&

$$

DISCUSSION...26
AVIATION...Johnson