U.S. Day 1 Fire Weather Outlook
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 090656
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0156 AM CDT Wed Jul 09 2025
Valid 091200Z - 101200Z
...CRITICAL FIRE WEATHER AREA FOR CENTRAL NEVADA INTO WESTERN
UTAH...
...Synopsis...
A compact midlevel trough will advance eastward across the northern
Great Basin during the day. At the same time, a separate large-scale
trough will move eastward across western Canada.
...Great Basin...
Preceding the compact midlevel trough, moderate deep-layer
southwesterly flow will overspread the Great Basin during peak
heating. Deep boundary-layer mixing into this strengthening flow
aloft will result in an expansive area of lower-teens RH and 20-25
mph sustained west-southwesterly surface winds. Given increasingly
dry fuels across the region, critical fire-weather conditions are
expected from central NV into western UT (with elevated conditions
surrounding this area across the Great Basin).
...Northwest...
Large-scale ascent accompanying the compact midlevel trough will aid
in isolated to widely scattered thunderstorm development over
southeastern OR, southwestern ID, and far northeastern CA during the
afternoon/evening hours. Deep inverted-V soundings and 0.5-0.7 inch
PW will favor dry thunderstorms -- with a risk of lightning-induced
ignitions and strong/erratic outflow winds.
Additionally, strong westerly flow in the base of the large-scale
trough moving across western Canada will persist across the
Cascades. Despite slightly higher RH than previous days, strong
downslope/westerly surface winds will favor elevated to locally
critical fire-weather conditions in the Columbia Basin.
..Weinman.. 07/09/2025
|
U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 090656
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0156 AM CDT Wed Jul 09 2025
Valid 101200Z - 111200Z
...Synopsis...
Along the northern periphery of a large-scale ridge over the
Southwest, a midlevel shortwave trough will move eastward from the
Great Basin into the central Rockies. Enhanced westerly flow aloft
accompanying this feature will overspread a deeply mixed boundary
layer during the afternoon. As a result, an expansive area of 15
percent RH and 15-20 mph sustained westerly surface winds will favor
elevated to locally critical fire-weather conditions across the Four
Corners region.
..Weinman.. 07/09/2025
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 082149
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0449 PM CDT Tue Jul 08 2025
Valid 101200Z - 161200Z
...Day 3/Thursday...
A mid-level short wave with associated stronger deep layer westerly
flow will bring a fire weather threat to a corridor from the Arizona
Strip to the Western Slope. The stronger westerly flow in concert
with a dry/well-mixed boundary layer will promote a dry and breezy
setup amid an increasingly dry fuelscape.
...Days 4-8/Friday-Tuesday...
Model guidance consensus indicates a broad mid-level ridge centroid
slowly propagating westward from AZ on Day 3/Thursday to off the
southern CA coast by Day 7/Monday. Primary impact will be increasing
temperatures to above seasonal normals along with dry conditions
across the majority of the West, aiding in drying of fuels. Stronger
west-northwesterly flow across the Northern Tier states could
provide for elevated surface winds at times, but overlap of a low
relative humidity/dry fuel environment is not likely with the
exception of southern ID/Snake River Plain over the weekend (Days
5-6/Saturday-Sunday). Overall thunderstorm threat will be limited to
the eastern U.S. (along and east of the Continental Divide) through
early next week.
..Williams.. 07/08/2025
|
|