Fire Weather Outlook Discussion
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FNUS21 KWNS 161613

Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1112 AM CDT Wed Aug 16 2017

Valid 161700Z - 171200Z


No changes have been made to the ongoing forecast. Latest guidance
continues to suggest locally elevated fire weather conditions may
occur briefly this afternoon and early evening across parts of
eastern WA/OR and north-central MT. However, confidence in a
sufficient overlap of sustained winds around 15-20 mph with RH
values lowered to near-critical levels remains too low to introduce
an elevated area across either the Pacific Northwest or the northern
Rockies/High Plains. See the previous discussion below for more

..Gleason.. 08/16/2017

.PREV DISCUSSION... /ISSUED 0202 AM CDT Wed Aug 16 2017/

A broad mid/upper-level trough will remain in place over much of the
West today, though an upper ridge will start to build back into the
Pacific Northwest late in the period. A weak shortwave embedded
within the larger-scale trough is forecast to move into portions of
BC/AB, potentially leading to a modest increase in wind speeds
across portions of the interior Northwest. Elsewhere across most of
the West, relatively dry conditions and light winds are expected.

...Interior Northwest into the Northern Rockies...
Near-critical RH will be possible across portions of the interior
Northwest into the northern Rockies within a weak downslope flow
regime. As mentioned above, a modest increase in wind speeds appears
possible across terrain-favored portions of central/eastern WA/OR,
southern ID, and northern MT as a weak shortwave trough passes to
the north. This will lead to the potential for locally elevated fire
weather conditions, with the greatest relative risk expected over
portions of the Columbia Gorge and in the lee of the Cascades.
However, confidence in elevated wind/RH criteria being met on more
than a brief and spotty basis remains too low for any delineation at
this time.

...Please see for graphic product...

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