U.S. Day 1 Fire Weather Outlook
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 260638
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0138 AM CDT Sat Jul 26 2025
Valid 261200Z - 271200Z
...Synopsis...
A broad upper trough will overspread much of the western U.S. while
upper ridging persists east of the Rockies today. Multiple embedded
mid-level impulses will traverse the northern Great Basin into the
northern Rockies during the afternoon, encouraging dry and breezy
conditions across parts of the Great Basin into the Four Corners
region, as well as thunderstorm development into the Pacific
Northwest.
By afternoon peak heating, southwesterly sustained surface winds
will reach 15-25 mph as RH dips to 10-20 percent across the eastern
Great Basin/Four Corners. Elevated highlights have been maintained
given the presence of dry fuels. Farther to the northwest, from
Northeast California to the Idaho/Montana border, adequate mid-level
moisture and deep-layer ascent will support isolated to scattered
thunderstorm development atop a dry boundary layer. High-based
thunderstorms will produce a mix of wet and dry strikes atop
receptive fuels, warranting the continuation of isolated dry
thunderstorm highlights.
..Squitieri.. 07/26/2025
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U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 260638
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0138 AM CDT Sat Jul 26 2025
Valid 271200Z - 281200Z
...Synopsis...
Upper troughing will persist along the West Coast as the upper ridge
continues to build over the central and eastern U.S. tomorrow
(Sunday). Mid-level moisture along the upper trough will overspread
a dry boundary layer, characterized by inverted-v profiles (based on
forecast soundings). As such, a mix of wet and dry high-based
thunderstorms is anticipated during the afternoon and evening hours
across portions of the Pacific Northwest toward the northern
Rockies. Given dry fuels over the region and associated potential
for lightning induced ignitions, isolated dry thunderstorm
highlights have been added.
..Squitieri.. 07/26/2025
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 252153
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0453 PM CDT Fri Jul 25 2025
Valid 271200Z - 021200Z
...Synopsis...
A subtropical ridge will begin to expand over much of the central
and southern CONUS into early next week, while troughing continues
over the Pacific. Deepening south-southwesterly flow will accompany
this pattern from southern CA into the Pacific Northwest and Great
Basin through at least mid week.
...D3/Sunday...
A couple of mid-level perturbations will continue to impact the
northern Sierra, northern Great Basin, and portions of the Pacific
Northwest. Ascent and moisture associated with these features, in
addition to orographic lift, will likely support low shower and
thunderstorm chances across these regions. A low probability area
for dry thunderstorms was considered mainly for the northern Sierra
and southern OR east of the Cascades, but will not be introduced
into the forecast at this time given a lack of confidence in lower
PWAT values.
Localized hot, dry, and breezy conditions are expected across the
Southwest, Great Basin, and portions of the central Rockies.
However, lower overall wind speeds preclude the need for any low
critical probability areas for the time being.
...D4/Monday-D7/Thursday...
Chances of showers and thunderstorms will continue into at least
D7/Thursday from northern CA, into the Pacific Northwest, and
northern Rockies downstream of a persistent Pacific trough. A slow
increase in low to mid-level moisture each day should limit the
opportunity for dry lightning strikes, although an initial threat of
this may exist early in the week.
..Barnes.. 07/25/2025
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