Storm Prediction Center Day 1 Fire Weather Outlook
Created: Wed Jul 3 16:44:03 UTC 2024 (
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Storm Prediction Center Day 1 Fire Weather Outlook
Created: Wed Jul 3 16:44:03 UTC 2024 (
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Click for Day 1 FireWX Areal Outline Product
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 031642
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1142 AM CDT Wed Jul 03 2024
Valid 031700Z - 041200Z
...CRITICAL FIRE WEATHER AREA FOR SOUTHERN IDAHO...
...CRITICAL FIRE WEATHER AREA FOR EAST-CENTRAL UTAH...
...17Z Update...
Elevated highlights for the Sacramento Valley and much of the Great
Basin into the Central Rockies have been maintained, with fire
weather conditions in the Sacramento Valley expected to diminish by
21-22Z. Much of Eastern Oregon into portions of Northwestern Nevada
were removed from the Elevated highlight area due to increasing
confidence that surface winds will remain below the 15 MPH criteria.
However, locally elevated conditions are possible with surface
conditions expected to be hot and dry.
The Critical highlight over Southern Idaho has been maintained, with
gusts of 25-30 MPH already observed this morning. Relative humidity
is anticipated to drop below 15% during the afternoon with fuels
that are modestly receptive to wildfire spread.
A Critical area was introduced for much of East-Central Utah into
the Upper Colorado River Basin. HREF guidance has increased
confidence in RH < 15% and wind gusts > 25 MPH occurring, with fuels
receptive to wildfire spread, particularly with southwestward
extent.
..Halbert/Lyons.. 07/03/2024
.PREV DISCUSSION... /ISSUED 0158 AM CDT Wed Jul 03 2024/
...Synopsis...
A mid-level trough will overspread the northern Rockies while upper
ridging prevails across much of the CONUS today. Adequate
upper-support associated with the passing mid-level trough will
encourage dry and windy conditions across portions of northern
California and the northern Great Basin toward the central Rockies.
Portions of the Sacramento Valley in California will be the first
region impacted by fire weather conditions. 15+ mph sustained
northerly surface winds should already be ongoing by the morning
hours, with RH decreasing to 15 percent by late morning into early
afternoon. Elevated highlights were added to parts of the Sacramento
Valley given receptive fuels in the area. 15+ mph sustained westerly
surface winds will also overlap with a large area of RH dropping
below 15 percent across parts of the Great Basin into the central
Rockies. Fuels are also receptive to wildfire spread in this region,
warranting the maintenance of Elevated highlights. Critical
highlights have also been maintained across portions of the Snake
River Plain in southern Idaho, where westerly surface winds may
sustain well above 20 mph for at least a few hours around afternoon
peak heating.
...Please see www.spc.noaa.gov/fire for graphic product...