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FNUS28 KWNS 251958

Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0257 PM CDT Tue Jul 25 2017

Valid 271200Z - 021200Z

Through the weekend, a mid/upper ridge initially anchored over New
Mexico will slowly build west towards the Great Basin. Along its
northwestern periphery, weak impulses will continue to traverse the
Pacific Northwest and northern Rockies. Thereafter, the ridge will
amplify across much of the western US, with stronger westerly flow
generally relegated to the Canadian border and points north. As a
result, conditions should gradually turn warmer/drier across parts
of the Inter-Mountain West.

...Dry-Thunderstorm Threat...
The closed mid/upper low currently along the northern California
coast will open and lift northeast through the end of the week, as
it`s absorbed by stronger west/southwesterly flow over the northern
Rockies. Thunderstorm chances on D3/Thu will generally be confined
to areas along/ahead of this system, and the 10% area is maintained
across the northern Rockies. On D4/Fri, while somewhat drier
mid-level air may have overspread parts of the region (in the wake
of the previous system), another weak shortwave trough may approach
from the eastern Pacific. In turn, the potential for isolated
dry-lightning strikes could persist, and a 10% area is introduced
from eastern Oregon to western Montana.

...Gusty Winds/Low RH Threat...
A shortwave trough will transit from Vancouver Island to the
Canadian Rockies on D3/Thu, with an attendant surface front crossing
Washington during the day. Behind this front, breezy winds and low
RH should materialize, supporting at least an elevated fire-weather
threat. Therefore, the ongoing 40% area is maintained in the lee of
the Cascades for D3/Thu. The front will continue east through
D4/Fri, with dry/breezy conditions possible across northern/central
Montana during the afternoon and evening. With dry fuels likely
remaining in place here, the 40% area is maintained with some
spatial adjustments to account for recent guidance trends.

..Picca.. 07/25/2017

...Please see for graphic product...

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