931 
FXUS65 KMSO 242012
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
212 PM MDT WED JUN 24 2015

...HISTORIC HEAT WAVE COMING THIS WEEKEND...

.DISCUSSION...A few thunderstorms are possible this evening across
the Sapphire mountains through Butte and Anaconda. Otherwise, a
warming and drying trend has started that will last will culminate
early next week with historically very high temperatures.

Beginning Thursday afternoon, a strong ridge of high
pressure will build over the Northern Rockies and will lead to
increasing temperatures and continued dry conditions. This
unseasonably warm ridge is expected to bring record heat over the
weekend. High temperatures is expected to be in the upper 90s to
low 100s for most valley locations. People planning on doing any
outdoor activities should stay well hydrated and pay special
attention to the elderly, children and pets. 

By late Sunday, the ridge axis begins to move to our east, which
will allow moisture to move through the ridge. This will increase
cloud cover and will keep nighttime temperatures warm, with most
locations staying in the 60s, so there will be limited relief
overnight. An increase in moisture will allow thunderstorms to
develop over the terrain on Sunday and Monday. This will bring
breezier conditions and the threat for dry lightning. The strong
ridge of high pressure is expected to continue through middle of
next week.

&&

.AVIATION...Few aviation impacts today with a ridge of high
pressure building in today. Expect mid and high clouds to keep
streaming over the region from the west to continue as debris
coming off the large low pressure system in the Gulf of Alaska.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...None.
ID...None.
&&

$$