Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 192315

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
515 PM MDT Mon Jun 19 2017

.DISCUSSION...(This Evening Through Monday)
Issued at 255 PM MDT Mon Jun 19 2017

Current surface analysis shows high pressure from the northern
Rockies to the Central Plains. Upper level analysis shows large
scale trough over the Great Lakes region, with high pressure over
the Four Corners region. Ridge extends north-northwest of the high
across the intermountain west. Strong northwest flow aloft is in
place across the Northern Plains. An extensive CU field has
developed across the region, with partly cloudy skies in most
areas. Temps are in the 70s and lower 80s with breezy west-
northwest winds across much of the plains, especially the SD

Quiet weather is expected to continue across the area through the
day on Tuesday, with partly cloudy conditions. Some warmer air will
continue to build into the area through Tuesday, with highs tomorrow
in the 80s to around 90 degrees. However, a weak frontal boundary
will try and slip south into at least far northwest SD late tonight
and early Tuesday, with slightly cooler temps expected across this
area. This front will slide back northeast of the CWA as a warm
front later Tuesday as a pacific cold front moves across the
Rockies. The cold front will move into the area later Tuesday night
and Wednesday morning. A few showers and thunderstorms could develop
across the area ahead of the front Tuesday night. The front will
bring breezy conditions and some cooler air behind it to at least
western portions of the CWA on Wednesday. Isolated showers and
storms could redevelop Wednesday afternoon and night, especially
from the Black Hills south and eastward.

A stronger shortwave system will slide southeast across the Northern
Plains on Friday, bringing colder Canadian air, along with a better
chance for showers and a few thunderstorms Friday into Saturday.
Cool air will be in place for much of the weekend, with highs in the
60s and 70s and lows mostly in the 40s. Looks like warmer air will
build back into the region early next week.


.AVIATION...(For the 00Z TAFS Through 00Z Tuesday Evening)
Issued At 515 PM MDT Mon Jun 19 2017

VFR conditions are expected through the period.




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