Fire Weather Outlook Discussion
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FNUS28 KWNS 192101

Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0400 PM CDT Tue Sep 19 2017

Valid 211200Z - 271200Z

Much of the extended period will be characterized by a building
ridge across the eastern US and a persistent trough across most of
the western US. Between these two features, a corridor of strong
southwesterly flow aloft will exist from the Desert Southwest
northeastward to the upper Great Lakes.

With enhanced tropospheric flow over parts of the Southwest, Great
Basin, Rockies, and adjacent High Plains, breezy conditions will
likely be realized in many parts of these regions. Dry tropospheric
air will remain established across much of the western US as well,
such that RH values around 10-25% are achieved by afternoon. While
these meteorological conditions may favor pockets of critical
concerns, marginal fuels in many locations preclude the introduction
of a 70%/critical area. Additionally, the ongoing 40% area has been
adjusted to align with zones of more receptive fuels.

...D4/Friday and onward...
The persistence of the trough over the West suggests a channel of
breezy conditions will be maintained from the Southwest to the
central Plains into the upcoming weekend. However, gradually
increasing RH values and moistening fuels lend considerable
uncertainty as to where, if any, enhanced fire-weather concerns may
occur. In turn, no probabilities have been introduced after

..Picca.. 09/19/2017

...Please see for graphic product...

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