003
FNUS21 KWNS 161700
FWDDY1

Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1159 AM CDT Mon Jun 16 2025

Valid 161700Z - 171200Z

...CRITICAL FIRE WEATHER AREA FOR PARTS OF SOUTHERN
NEVADA...SOUTHWESTERN UTAH AND NORTHWESTERN ARIZONA...

...Great Basin and Southwest...
Current surface observations show single digit relative humidity
across the southern Great Basin and parts of the Southwest.
Increasing mid-level flow ahead of an upper-level trough coupled
with a very dry/well-mixed boundary layer will promote sustained
surface winds of 20-25 mph across a corridor from southern Nevada,
northwestern Arizona and much of southern Utah with critical
highlights maintained amid the very low relative humidity regime and
dry fuels. Elevated fire weather concerns continue for a broader
area of the Great Basin and Southwest as the upper-level trough
translates eastward through the region. Otherwise, forecast remains
largely on track.

..Williams.. 06/16/2025

.PREV DISCUSSION... /ISSUED 0158 AM CDT Mon Jun 16 2025/

...Synopsis...
A midlevel trough will advance eastward from the West Coast across
parts of the Great Basin/Intermountain West today. Within the base
of the trough, moderate deep-layer westerly flow will overspread the
Great Basin, while a weak surface low/trough evolves over the Lower
CO River Valley.

...Southern NV into Southwest UT and far Northwest AZ...
Along the southern periphery of mid/high-level clouds preceding the
midlevel trough, strong diurnal heating of a warm/dry antecedent air
mass will result in a deeply mixed boundary layer across the
southern Great Basin. The deep mixing into the enhanced flow aloft,
along with a tightening pressure gradient peripheral to the surface
low/trough, will yield single-digit RH and 20-25 mph sustained
southwesterly surface winds (with higher gusts) across southern NV,
southwest UT, and far northwest AZ. Given increasingly dry fuels
across the region, critical fire-weather conditions are expected.

Farther north, modest westerly flow aloft across the Cascades will
contribute to locally dry/breezy downslope flow into the Columbia
Basin, where elevated fire-weather conditions are forecast.

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

$$