ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 151652
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1152 AM CDT Sun Jun 15 2025
Valid 151700Z - 161200Z
Dry downslope flow east of the Sierra Crest along with dry fuels
will contribute to elevated fire weather conditions across far
western Nevada this afternoon. Single digit relative humidity along
with breezy southwest winds are expected across central/southern
Nevada and southwestern Utah. However, mid and upper slope
fuelscapes remain largely in green up phase, limiting fire spread
potential to lower elevation cured grasses with average fuel
loading.
..Williams.. 06/15/2025
.PREV DISCUSSION... /ISSUED 0156 AM CDT Sun Jun 15 2025/
...Synopsis...
A belt of modest mid-level flow will be positioned over the Great
Basin during the day, and strong mixing during the afternoon is
expected to bring some of that flow to the surface, resulting in a
couple areas of fire weather concerns. An Elevated area was
maintained across parts of northwestern Nevada, where RH is expected
to be near 5-15% with 15-20 mph surface winds atop dry fuels.
Similar atmospheric conditions are expected across eastern Nevada
into west-central Utah, however fuels in this region are not as dry.
Therefore, have held off on introducing Elevated highlights in this
area for now.
U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 151954
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0254 PM CDT Sun Jun 15 2025
Valid 161200Z - 171200Z
...CRITICAL FIRE WEATHER AREA FOR PARTS OF SOUTHERN
NEVADA...SOUTHWESTERN UTAH...AND FAR NORTHWESTERN ARIZONA...
...Southern Nevada, Southwestern Utah and far Northwestern
Arizona...
Modest mid-level flow associated with a progressive upper-level
trough will move into the Great Basin and Southwest Monday. A very
dry, well-mixed boundary layer will support low teens to single
digit relative humidity values across the region. A corridor of
20-30 mph winds are most likely from southern Nevada into
south-central Utah where very low daytime humidity will support
Critical fire weather conditions amid dry fuels.
...Columbia Basin...
The upper-level short wave translating through the Pacific Northwest
Monday will contribute to enhanced downslope winds particularly
across the western portions of the Columbia Basin. West winds of
around 15 mph combined with relative humidity in the 15-25 percent
range will result in elevated fire weather concerns for central
Washington state and Columbia River Gorge where ongoing fire
activity remains.
..Williams.. 06/15/2025
.PREV DISCUSSION... /ISSUED 0156 AM CDT Sun Jun 15 2025/
...Synopsis...
During the day on Monday, a mid-level shortwave trough is expected
to traverse California and into the Great Basin, and the surface
mass response to this feature will tighten the sea-level pressure
gradient across the area, resulting in strong surface winds. With
seasonably strong vertical mixing, RH in the Great Basin and Four
Corners region is expected to be around 5-15%. The best overlap of
windy conditions and dry fuels is expected to be across parts of
southeast Nevada, southwest Utah, and far northwest Arizona, where
Critical highlights have been added. In this area, winds are
expected to be near 20-30 mph with gusts as high as 35-40 mph
underneath the core of the mid-level jet associated with the
shortwave trough. Surrounding that Critical area, winds may be
weaker and fuels less receptive to fire spread. However, this still
warrants an Elevated area across parts of the Great Basin and Four
Corners region.
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 152201
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0501 PM CDT Sun Jun 15 2025
Valid 171200Z - 231200Z
...Day 3-4/Tuesday-Wednesday...
An eastward propagating upper-level short wave trough and associated
increased mid-level flow will overspread the Southwest on Day
3/Tuesday. Critical probabilities were maintained as prolonged burn
periods with poor to moderate RH recoveries and single digit daytime
RH values combine with southwest winds of 15-25 mph across eastern
Arizona and western New Mexico. A 40 percent probability area was
added for the Columbia Basin for Day 4/Tuesday as another Pacific
Northwest short wave trough moves into the region supporting
downslope/leeward drying and breezy west winds across the area amid
dry fuels.
...Day 5-8/Thursday-Sunday...
A deepening upper-level trough begins to impact the western U.S. on
Day 5/Thursday, promoting a multi-day fire weather threat across the
Great Basin with fire weather concerns shifting east into the
Southwest and Intermountain West into the weekend. Fuels will
continue to dry across the region under an above normal temperature
regime with dry, breezy southwest winds setting the stage for
increased fire spread potential. Dry and breezy conditions could
also impact ongoing active fires across the region.
..Williams.. 06/15/2025