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FNUS28 KWNS 272032
FWDD38

Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0331 PM CDT Thu Jul 27 2017

Valid 291200Z - 041200Z

The extended period will be characterized by a building mid/upper
ridge across the western US and cyclonic flow across much of the
eastern US. Prior to the ridge building in earnest across the
Northwest, a few weak/subtle impulses will slowly advance across the
Great Basin, Pacific Northwest, and northern Rockies this weekend,
enhancing terrain-driven convection slightly. Otherwise, conditions
will turn much warmer/dryer across parts of the West next week, as
mid-level heights rise and high pressure anchors over parts of the
northern Great Basin.

...Dry-Thunderstorm Threat...
10%/marginal areas have been introduced from the northern Sierra
Nevada northeast to the northern Rockies for D3/Sat-D4/Sun. The
aforementioned mid-level impulses, combined with sufficient buoyancy
aloft, should focus thunderstorm development within this corridor
over the weekend. Precipitable-water values are forecast to support
a mixture of wet/dry modes, such that at least a few lightning
strikes will likely result in new ignitions. Additionally, gusty
outflow winds will hamper ongoing fire-suppression efforts. After
this weekend, while the building ridge will favor hotter
temperatures and lower RH values, large-scale forcing for
thunderstorm activity will be quite subtle, resulting in
predictability too low for highlights at this time.

..Picca.. 07/27/2017

...Please see www.spc.noaa.gov/fire for graphic product...

$$



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