Weather Service Report

FXUS65 KBYZ 260922

Area Forecast Discussion
National Weather Service Billings MT 
322 AM MDT Fri May 26 2017

.SHORT TERM...valid for Tdy and Sat...

An upper low over south central Canada combined with a high 
pressure ridge axis over the Pacific Northwest will provide for a 
continued northerly flow aloft across our forecast area today. The
low will provide another day of unsettled cyclonic flow across 
the area and this combined with somewhat steep lapse rates across 
our central and western areas will result in a chance for showers 
and isolated thunderstorms today into this evening along and west 
of a Roundup- Billings- Sheridan line. Winds today will be much 
lighter than yesterday except from about Rosebud County eastward 
where gusty northwest winds will continue. 850mb temperatures will
be a few degrees warmer today allowing readings to inch closer to

Cyclonic flow aloft will continue one more day Saturday as the 
above mentioned upper low slowly shifts east. A weak disturbance 
aloft will move overhead bringing another chance for showers and 
isolated thunderstorms. At the same time, the ridge over the 
Pacific northwest shifts a bit further east as well allowing for 
rising heights across south central Montana. As a result, expect 
temperatures to warm to or slightly above normal with readings in 
the upper 60s to lower 70s. Hooley

.LONG TERM...valid for Sun...Mon...Tue...Wed...Thu...

Models were in decent agreement on the pattern for this upcoming 
week. The pattern will be slow moving as an omega block will be in
place over most of North America. The northern Rockies will be 
under the influence of higher pressure with gradually building 
heights. The flow aloft through the early part of the period will 
be northwest and consensus was for the models to bring weak energy
through the state and trigger afternoon and evening showers and 
thunderstorms. The ridge is progged to slide east by the end of 
the week and this could open the door up for increasing chance of 
thundestorms. Temperatures will warm through the weak with high 
pressure aloft. TWH



VFR conditions are expected today. An area of low pressure over 
Idaho will slide into western Wyoming today and spread clouds and 
a chance of showers to western locations, mainly the mountains and
foothills. Local MVFR conditions are possible in the heavier 
showers. Mountains will become obscured. TWH



    Tdy Sat     Sun     Mon     Tue     Wed     Thu     
BIL 066 045/072 049/075 050/075 049/079 052/082 053/082
    2/T 12/T    13/T    22/T    11/U    11/U    12/T
LVM 062 036/070 041/074 042/074 044/077 045/079 045/080
    3/T 22/T    23/T    22/T    22/T    11/B    12/T
HDN 067 043/072 046/076 046/076 047/081 050/085 051/083
    2/T 12/T    12/T    22/T    01/U    01/U    12/T
MLS 069 044/073 048/076 046/074 046/079 051/082 052/083
    0/B 12/T    12/T    00/U    00/U    00/U    12/T
4BQ 066 043/070 046/074 044/073 044/077 048/081 050/081
    0/B 12/T    12/T    10/U    00/U    00/U    12/T
BHK 065 041/069 043/071 041/069 038/074 046/076 047/077
    0/B 12/T    12/T    00/U    00/U    00/U    01/U
SHR 059 039/066 043/071 042/072 042/076 045/080 047/080
    3/T 22/T    23/T    22/T    11/B    11/B    12/T





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