Area Forecast Discussion
Issued by NWS Billings, MT

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FXUS65 KBYZ 101556

Area Forecast Discussion...Updated
National Weather Service Billings MT
856 AM MST Sun Dec 10 2017

Another windy and dry day across the region with above normal
temperautres. Winds will be even stronger along the foothills
than yesterday and a better chance of seeing gusts to 50 mph.
Current forecast on track no updates. borsum


.SHORT TERM...valid for Tdy and Mon...

High amplitude ridge will remain anchored over the western U.S.
through Monday night. Shortwave, seen moving into BC on water
vapor imagery early this morning, will move into ND this evening.
An unusually strong 700 mb wind max will accompany the wave and
move through SE MT overnight. While winds in the low to mid levels
will be quite strong, low lapse rates, limited pressure rises and
low-level inversions should keep strong winds from mixing to the
surface. West of KBIL, there were high probabilities of Sub-
Advisory wind speeds in the KLVM area at 18Z today. The chances
for these gusty winds decrease in the afternoon. For areas from
Harlowton to Big Timber, the pressure gradient and mixing
potential were not strong enough to support high winds. However,
winds will be gusting to around 50 mph in these areas, as well as
in KLVM. Therefore will continue a bar graph Weather Story to
advertise the strong cross winds for Highway 191 and I-90.

Regarding temperatures, highs will reach the upper 40s to upper
50s today. It will be cooler on Monday due to cooler air behind
the system that will be moving SE out of the Dakotas. Arthur

.LONG TERM...valid for Tue...Wed...Thu...Fri...Sat...

No major changes to the going extended forecast. Strong blocking
ridge remains in place until Thursday or Friday. Up until then
dry, warm and breezy to windy conditions will persist across the
area. As the ridge breaks down will see cooler conditions and at
least a chance for a rain or snow shower, however west to
northwest winds will remain gusty providing downslope to work
against plains precipitation and holding temperatures above normal
(though cooler than early in the week). No arctic air or major
storm systems showing up out to day 10 at this time. Chambers



VFR conditions will prevail through the TAF period. Gusty west to
northwest winds will continue, reaching up to 40kts at times
especially late this afternoon into this evening. Chambers


    Tdy Mon     Tue     Wed     Thu     Fri     Sat
BIL 053 030/048 031/055 033/049 029/049 033/050 031/045
    0/N 00/U    00/U    00/B    10/B    02/W    21/B
LVM 048 028/047 030/054 030/047 025/047 033/046 031/044
    0/N 00/B    00/U    01/B    11/B    03/W    41/N
HDN 055 027/049 027/055 029/049 026/049 029/050 029/046
    0/N 00/U    00/U    00/B    11/B    02/W    31/B
MLS 052 028/044 024/052 029/045 025/045 028/049 027/044
    0/U 00/B    00/U    00/B    11/B    13/W    31/N
4BQ 054 031/045 024/054 031/047 025/045 027/050 028/044
    0/N 00/N    00/U    00/B    11/B    12/W    31/B
BHK 048 027/038 020/049 027/041 022/040 025/047 025/042
    0/U 00/N    00/B    01/B    11/B    12/W    31/N
SHR 056 028/049 026/056 028/049 024/048 025/050 025/044
    0/U 00/U    00/U    00/B    11/U    02/W    31/B




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