Fire Weather Outlook Discussion
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
FNUS22 KWNS 251806

Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0106 PM CDT Mon Sep 25 2017

Valid 261200Z - 271200Z

The previous outlook remains on track and no changes are needed. See
discussion below for more details.

..Leitman.. 09/25/2017

.PREV DISCUSSION... /ISSUED 0300 AM CDT Mon Sep 25 2017/

The persistent upper-level trough over the western CONUS will begin
to break down during this forecast period, with a cutoff upper-level
low forming in the vicinity of the lower CO River Valley.  Modestly
enhanced northerly mid- to upper-level flow of 35-45 kt is forecast
to continue over much of CA.  Surface high pressure will remain
present over portions of the Pacific Northwest and Great Basin
regions along with warm/dry conditions.

...Portions of the Sacramento Valley and Adjacent Coastal Ranges of
Northern CA...
Elevated fire weather conditions are likely once again Tuesday
afternoon across portions of the Sacramento Valley and adjacent
Coastal Ranges of northern CA. Diurnal heating and vertical mixing
should promote an increase in northerly surface wind speeds
approaching 15 mph along with RH values decreasing into the 10-20%
range, supporting an elevated designation across this region.

...Portions of Southern CA...
Elevated fire weather conditions will be likely across portions of
southern CA, particularly Tuesday morning, with elevated conditions
possible again early Wednesday morning. The surface pressure
gradient is forecast to be maximized during these periods, bringing
sustained offshore surface winds around 15-20 mph across the area,
with stronger gusts possible in higher elevations. Locally critical
fire weather conditions appear possible for a brief period Tuesday
morning, given the combination of strong winds, lowered RH values
around 10-15%, and dry fuels. However, these conditions are not
expected to occur for more than 3 continuous hours, and therefore no
critical area has been introduced.

...Please see for graphic product...

$$ is the U.S. government's official web portal to all federal, state and local government web resources and services.