687
FNUS21 KWNS 031655
FWDDY1

Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1155 AM CDT Wed Sep 03 2025

Valid 031700Z - 041200Z

An upper-level trough supporting ongoing convection across the
northern Sierra Nevada will promote expanding showers and
thunderstorms across northern CA as well as the Cascades and
south-central OR later this afternoon. Additional lightning
ignitions are possible, particularly in drier, heavier fuels along
the Shasta Siskiyous and Cascades. The northeast extent of dry
thunderstorm highlights was trimmed across portions of central OR as
well as the northern Sacramento Valley area, supported by latest CAM
and ensemble model guidance.

..Williams.. 09/03/2025

.PREV DISCUSSION... /ISSUED 0149 AM CDT Wed Sep 03 2025/

...Synopsis...
A weak upper-level trough will continue to move northward across
northern California into the Pacific Northwest on Wednesday. Lift
associated with this feature will promote isolated to scattered
thunderstorm activity. Thunderstorms will likely be ongoing at the
beginning of the period with a second round developing by the
afternoon. Overall, a mix of wet/dry thunderstorms is expected
across the driest fuels in northern California, far western Nevada,
and central Oregon. While locally higher totals will be possible in
the strongest storms, ensemble guidance generally shows < 0.10"
across much of this region. New lightning starts were reported on
Tuesday in these areas, with rainfall amounts 0.10-0.25". An
isolated dry thunderstorm area was maintained with this outlook to
support this potential.

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

$$