Area Forecast Discussion
Issued by NWS Billings, MT

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FXUS65 KBYZ 250339
AFDBYZ

Area Forecast Discussion...Updated
National Weather Service Billings MT
939 PM MDT Sun May 24 2020

.UPDATE...

Expect some isolated showers through midnight but the bulk of the
shower activity has decreased considerably the past few hours and
this trend will continue for the remainder of the evening.
Current satellite is showing clouds are beginning to break up for
some areas and we expect skies to continue to clear as the night
progresses. As skies clear late, we are expecting patchy fog to
develop, especially for areas that received a good amount of rain.
Some of this fog may be dense with the most favored time between
3am and 9am. The previous forecast has this covered so no
significant updates were made this evening. Hooley

&&

.DISCUSSION...

Tonight through Tuesday night...

Precipitation coverage will decrease through the rest of the
evening as the upper low over our region slowly slides to the
east. Clouds may clear out late and there may be a lull in any
wind allowing patchy fog to develop. There is a chance fog may
become dense and widespreading some areas, but confidence is not
high enough yet as upper low is drifting quite slow and lingering
cloud cover may prevent widespread development. Overnight lows
will be in the 30s and lower 40s.

For Memorial Day, the upper low will finally exit to the
Dakotas and upper ridging will build over the Northern Rockies.
Westerly flow in the mid levels will help the mercury bounce back
to around the lower 70s. There is a small fly in the warmer and
drier ointment as a weak disturbance moving quickly eastward
across Montana will bring scattered showers to the foothills and
mountains west of Billings Monday night. The speed of the
shortwave combined with weak ascent suggest that any precipitation
will be light.

Tuesday will be a little warmer, but there is a continued chance
of showers and maybe some thunder in the mountains and nearby
foothills. Tuesday night looks relatively mild with lows in the
40s to lower 50s. BT

Wednesday through Sunday...

Zonal flow will continue Wednesday, but for the latter part of the
work week and into the weekend, flow will become more ridgy.
This will see temperatures warming into the weekend, with highs
going from the 70s on Wednesday to the uppers 80s to lower 90s for
the weekend. While there will be some riding, it does not look to
be that strong and some energy to ride under the ridge. There
could be some afternoon thunderstorms in the higher terrain. CAPE
values still are on the low side, so expecting nothing more than
garden variety storms. Reimer

&&

.AVIATION...

Isolated to scattered showers will dissipate over the area by
06Z tonight. Patchy fog is possible late tonight into Monday
morning. VFR conditions will prevail with areas of mountain
obscuration decreasing overnight. SW surface winds will gust into
the 20s late tonight through Monday at KLVM. Arthur

&&

.PRELIMINARY POINT TEMP/POPS...

    Mon     Tue     Wed     Thu     Fri     Sat     Sun
-----------------------------------------------------------
BIL 042/072 053/076 054/074 051/078 054/087 059/092 062/093
    20/U    11/B    02/T    11/U    01/B    11/B    11/B
LVM 038/070 049/073 051/074 048/078 052/087 056/089 057/090
    21/U    33/T    12/T    11/B    11/B    12/T    12/T
HDN 040/072 050/076 051/074 050/079 054/087 058/093 060/095
    20/U    11/B    02/T    10/U    11/B    11/U    11/B
MLS 043/070 050/076 052/074 049/076 054/085 058/092 061/094
    20/U    01/B    01/B    10/B    00/B    10/U    11/B
4BQ 039/068 047/076 051/074 047/076 053/087 057/092 061/095
    20/U    00/B    01/B    10/U    10/B    10/U    11/U
BHK 040/067 045/074 049/073 045/073 050/081 054/088 057/091
    20/U    00/B    01/B    10/U    00/B    10/U    11/U
SHR 037/067 045/074 049/072 047/078 052/085 056/090 058/093
    20/U    01/B    12/T    11/B    11/U    11/U    11/B

&&

.BYZ WATCHES/WARNINGS/ADVISORIES...
MT...None.
WY...None.

&&

$$
weather.gov/billings



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