Day 1 Fire Weather Outlook  
NWS Storm Prediction Center Norman OK
1248 AM CDT Thu Jul 25 2024

Valid 251200Z - 261200Z

...Synopsis...
Isolated dry thunderstorms are anticipated across portions of
southern Idaho into southwestern Montana as an upper-level trough
progresses eastward across the Northwest. Additionally, elevated
fire-weather conditions are expected across the southern Cascades,
portions of northern Montana, and the northern Great Plains. 

...Pacific Northwest...
As an upper-level trough is forecast to progress eastward out of the
Pacific Northwest and into Montana, isolated dry thunderstorms are
expected across southeastern Idaho and into southwestern Montana
over receptive fuels. Some trimming of the previous forecast area,
particularly over southwestern Idaho, was necessary after
significant wetting rainfall occurred the previous day.
Additionally, current forecast guidance suggests a mix of both wet
and dry thunderstorms, precluding the introduction of a scattered
dry thunder area despite widespread thunderstorm coverage. Forecast
profiles across southwestern Montana show deep inverted-v boundary
layers supportive of gusty thunderstorm outflow that could
contribute to wildfire spread with both existing fires and new
lightning ignitions. 

Elevated fire-weather conditions are expected to occur over the
southern Cascades, especially where local gap flow enhanced winds
could contribute to wildfire spread with existing fires. Some
trimming of the previous forecast areas was necessary to account for
wetting rainfall occurring the previous day, leaving fuels less
receptive to ignition. Some elevated fire-weather conditions are
also possible in portions of north-central Montana, but the overlap
of stronger surface winds/low relative humidity and receptive fuels
is somewhat narrow. 

...Northern Great Plains...
Elevated fire-weather conditions are anticipated, particularly along
portions of western Montana and Wyoming, into eastern Nebraska and
the Dakotas. Strong southerly flow, coupled with hot, dry boundary
layer profiles, are expected to persist for much of the afternoon
and into the evening. Fuels in this region will be at or exceed the
90th percentile for ERCs, but conditions are expected to remain
below critical criteria for wind and relative humidity.

..Halbert/Lyons.. 07/25/2024

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