688 

FXUS63 KUNR 301138

AFDUNR



Area Forecast Discussion For Western SD and Northeastern WY

National Weather Service Rapid City SD

438 AM MST Tue Dec 30 2025



.KEY MESSAGES...



- Mild and dry conditions expected through the period.



&&



.DISCUSSION...(Today Through Monday)

Issued at 153 AM MST Tue Dec 30 2025



Upper ridge sits over the far western CONUS with northwest flow

over the forecast area this morning. 09Z surface analysis shows

high pressure over Wyoming, while a warm frontal boundary sits

over North Dakota. Currently Winds are light and variable with

temperatures in the 20s and low 30s. 



Expect warmer temperatures today as upper ridge has shifted

slightly eastward, with highs in the 40s to low 50s. A few weak

disturbances ride down the ridge over the next couple of days,

however models keep them to the east and north of us, limiting any

precipitation chances. Could see some temperature fluctuations 

and breezy winds at times given the proximity to these

disturbances. In general, expect temperatures to be above normal 

over the forecast area as we sit under the ridge through the 

week, however with the baroclinic zone being so close to the 

forecast area, any shift could cause parts of the CWA (mainly

northwest to central SD) to be cooler than the rest of the 

CWA. Long range models keep the area dry through the week.



&&



.AVIATION...(For the 12Z TAFS Through 12Z Wednesday Morning)

Issued At 438 AM MST Tue Dec 30 2025



VFR conditions are expected through the period.



&&



.UNR WATCHES/WARNINGS/ADVISORIES...

SD...None.

WY...None.

&&



$$



DISCUSSION/KEY MESSAGES...Dye

AVIATION...Dye