Area Forecast Discussion
Issued by NWS Billings, MT

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000 FXUS65 KBYZ 190835 AFDBYZ Area Forecast Discussion National Weather Service Billings MT 235 AM MDT Mon Apr 19 2021 .DISCUSSION... Today through Tuesday Night... Heavy snow persists across south-central Montana as upslope flow and upper jet divergence continues to produce ample ascent across the area. This heavy snow will continue through the morning, then slowly weaken as we approach the afternoon. Although snow will be lighter by the morning commute, a combination of it and slushy roads will produce hazardous conditions for the commute, even though the sun will already be rising and slowly raising temperatures. Some roads in the foothills, as well as Interstate 90 from Columbus through Livingston and south of Crow Agency through Sheridan, WY may have some lingering snow cover as well. In general, another couple inches of snow will still occur early this morning across the lower elevations, with another 3-6 inches possible in the foothills. Although snow will dramatically weaken late this morning, prominent mid-level lapse rates and some instability will keep light snow showers persisting through out the day, and even through Tuesday afternoon with a weak, last push fron this clipper. Highs will stay on the chilly side today, likely not getting above 40 and being almost 20 degrees below normal, and with not too much of a warmup for Tuesday as steep northwest to north flow persist. Vertz Wednesday through Sunday... Ridging will build into the area on Wednesday allowing temperatures to warm towards normal for this time of year. That will be short lived as another shortwave will move into the area late Thursday. This system will bring another chance of rain and snow showers to the area along. Temperatures will cool off on Friday into the 40s before warming back up into the 60s for the weekend. Unsettled weather looks to continue through the weekend with the potential for additional showers. Carrothers && .AVIATION... Snow will continue through the morning, tapering off from north to south during the afternoon. Light snow showers will impact most of southeastern Montana this afternoon. Snow and fog will reduce visibilities to LIFR conditions through the morning before improving late this morning. Expect conditions to begin improving generally after 18Z.Carrothers && .PRELIMINARY POINT TEMP/POPS... Tdy Tue Wed Thu Fri Sat Sun ------------------------------------------------------- BIL 038 024/042 022/052 030/061 032/044 030/061 039/060 6/S 22/S 00/U 00/U 55/S 21/B 33/R LVM 035 019/042 020/050 027/057 033/048 031/061 038/059 6/S 12/S 00/U 01/U 55/O 22/R 34/R HDN 039 024/042 021/052 025/062 031/044 028/061 037/061 5/S 42/S 00/U 00/U 45/O 21/B 22/R MLS 040 024/041 021/053 027/061 030/044 027/058 037/059 3/S 32/S 00/U 00/U 22/S 11/B 22/R 4BQ 036 025/038 021/048 027/057 030/044 028/058 038/061 3/S 42/S 00/U 00/U 22/S 10/B 11/E BHK 038 020/039 018/051 025/059 027/044 025/056 034/058 2/S 32/S 00/U 00/U 12/S 11/B 22/R SHR 033 020/037 015/045 020/054 028/043 026/058 034/061 8/S 43/S 00/U 00/U 24/O 21/B 12/R && .BYZ WATCHES/WARNINGS/ADVISORIES... MT...Winter Weather Advisory in effect until noon MDT today FOR ZONES 29>31-36-37-173. Winter Storm Warning in effect until 3 PM MDT this afternoon FOR ZONES 34-56-66>68-138-141-169-171-172-228. Winter Weather Advisory in effect until 3 PM MDT this afternoon FOR ZONES 40-42-57-58-63>65-139-170-235. WY...Winter Storm Warning in effect until 3 PM MDT this afternoon FOR ZONES 198-199. && $$ is the U.S. government's official web portal to all federal, state and local government web resources and services.