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-- Discussion containing changed information from previous version are highlighted. --
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.

&&

$$
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