Storm Prediction Center Day 1 Fire Weather Outlook
Created: Fri Sep 21 06:39:02 UTC 2018 (
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Storm Prediction Center Day 1 Fire Weather Outlook
Created: Fri Sep 21 06:39:02 UTC 2018 (
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Click for Day 1 FireWX Areal Outline Product
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 210637
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0137 AM CDT Fri Sep 21 2018
Valid 211200Z - 221200Z
...Synopsis...
A mid-level ridge will dominate the weather pattern across the
western CONUS throughout much of the day, with the ridge breaking
down Friday night. At the surface, high pressure will be in place
across Great Basin into the Rocky Mountains, with a pressure trough
developing from Montana down into the Great Basin late Friday night
as the mid-level ridge weakens and a mid-level shortwave trough
begins to approach the Pacific Northwest.
...Southern Portions of the Pacific Northwest...
As the mid-level shortwave trough approaches the Pacific Northwest,
35+ knot southwesterly mid-level flow will begin to overspread the
region. Though the mid-level flow will likely be modest, a very
well-mixed boundary layer, extending up to 400 mb, is expected to
mix the stronger winds aloft down to the surface, with elevated
surface conditions (i.e. critical RH and 15-20 mph winds) expected
amidst fuels receptive to fire spread.
...Portions of central Wyoming...
Modest mid-level flow traversing the ridge will overspread the area
during the diurnal heating cycle. With a deep boundary layer, at
least some downward momentum transfer is expected, with surface
winds potentially reaching the 15-20 mph range. As such, marginally
elevated conditions are expected during the mid to late afternoon
hours given critical RH and fuels that are at least marginally
conducive for supporting wildfires.
..Squitieri.. 09/21/2018
...Please see www.spc.noaa.gov/fire for graphic product...