775
FNUS21 KWNS 041630
FWDDY1

Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1129 AM CDT Fri Jul 04 2025

Valid 041700Z - 051200Z

...CRITICAL FIRE WEATHER AREA FOR EASTERN NEVADA AND
WESTERN/SOUTHWESTERN UTAH...

...Update...
Lightning is ongoing this morning over portions of southeastern and
southern OR, and southeastern ID. A mix of dry and wet thunderstorms
are still expected across this region throughout the day, and will
spread east and north with time. The Isolated Dry Thunderstorm area
was extended eastward across southern ID, northern UT, and
southwestern WY to account for low forecast precipitation amounts (<
0.25") and PWATs less than 0.75". The boundary layer within these
regions will remain relatively dry, with mostly inverted-V forecast
soundings depicted. Fuels also remain very receptive here.

Farther south, from near the Mojave Desert northeastward into
southeastern NV and western UT, low RH near 5-15% will combine with
breezy southwest winds around 20-35 mph this afternoon. No
adjustments were made to the Critical area. However, the Elevated
area was extended southward to include Death Valley National Park
and Las Vegas, to far northwestern AZ. Although most of this region
has limited fuel availability, critical meteorological fire weather
conditions are expected to persist for most of the day.

..Barnes.. 07/04/2025

.PREV DISCUSSION... /ISSUED 0152 AM CDT Fri Jul 04 2025/

...Synopsis...
A mid-level ridge will remain in place across the central CONUS,
with various shortwave troughs traversing the periphery. One such
trough is expected to move across portions of the Great Basin,
providing a focus for fire weather concerns through the day.
Scattered thunderstorms are expected across portions of southeastern
Oregon, where surface moisture will be sufficient for conditional
instability to develop. In this environment, inverted-V
thermodynamic profiles, low precipitable water, and strong
deep-layer shear suggest the potential for dry thunderstorms. Fuels
in the region have not received much rainfall recently and therefore
should be receptive to lightning ignitions.

Farther south across portions of the Great Basin, strong mixing is
expected to promote RH in the 5-15% range with strong winds. A
Critical area has been maintained across portions of southeast
Nevada and southwestern Utah, where a corridor of enhanced surface
winds is expected in association with a mid-level jet. This region
also has the best overlap with dry fuels.

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

$$