Storm Prediction Center Day 1 Fire Weather Outlook
Created: Fri Sep 21 06:39:02 UTC 2018 ( | )
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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...
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