Area Forecast Discussion
Issued by NWS Rapid City, SD

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FXUS63 KUNR 222009

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
209 PM MDT Mon May 22 2017

.DISCUSSION...(This Evening Through Monday)
Issued at 209 PM MDT Mon May 22 2017

Latest water vapor imagery shows a strong upper low over the
northern plains with a ridge of high pressure just off the west
coast. At the surface, a cold front extends through northern
Nebraska from a low centered over southern Minnesota. On the
radar, several convective showers and isolated thunderstorms have
developed across the forecast area. These showers are producing
quick bouts of rain and gusty winds.

Showers and storms will end late this evening as the shortwave exits
the area. Clouds will gradually decrease overnight, with low
temperatures dropping into the mid 30s to mid 40s.

On Tuesday, shortwave ridging will bring mainly dry conditions with
the exception of a few lingering showers early over south central
South Dakota. Generally, temperatures will be a little warmer with
highs in the mid 50s to mid 60s. Gusty northerly winds will

Return flow will set-up on Wednesday as the surface high moves off
to the east, with southerly winds and much warmer temperatures.
Early Thursday, a cold front will push through the forecast area
switching winds around to the northwest and cooling temperatures a
little. Friday through Sunday will be a little cooler than normal as
the next upper trough moves slowly through the northern CONUS from
an upper low over southern Canada. This upper trough will create
unsettled conditions with a daily chance of precipitation and gusty


.AVIATION...(For the 18Z TAFS Through 18Z Tuesday)
Issued At 1137 AM MDT Mon May 22 2017

Scattered -SHRA/TSRA will continue to develop across much of the
area through the afternoon. Small hail and gusty winds are
expected along with local MVFR conditions. Gusty northwest will
persist through early evening. Precip will end this evening with
VFR conditions through Tuesday morning.




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