U.S. Day 1 Fire Weather Outlook
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 051602
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1102 AM CDT Sat Jul 05 2025
Valid 051700Z - 061200Z
...Update...
The latest high resolution model guidance suggests wind speeds may
be slightly higher just outside the bounds of the Elevated area.
Therefore, a slight modification was made to extend it east and
southward. Otherwise, the forecast remains unchanged for today.
Please see the previous discussion for additional details.
..Barnes.. 07/05/2025
.PREV DISCUSSION... /ISSUED 0129 AM CDT Sat Jul 05 2025/
...Synopsis...
A mid-level ridge will continue to build across the southern Rockies
through the day. A weak 700 mb jet around the northwestern periphery
of the ridge is expected to mix downward amid strong surface heating
and provide a focus for fire weather concerns across portions of the
Great Basin. Winds may gust to 20-25 mph with 5-15% RH during the
afternoon. Therefore, an Elevated highlight has been maintained
across portions of southeastern Nevada and southwestern Utah where
these atmospheric conditions overlap with dry fuels that have not
received wetting rain recently.
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U.S. Day 2 Fire Weather Outlook
ZCZC SPCFWDDY2 ALL
FNUS22 KWNS 051854
Day 2 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0154 PM CDT Sat Jul 05 2025
Valid 061200Z - 071200Z
...NO CRITICAL AREAS...
...Update...
No changes are required for Saturday's outlook. The forecast remains
accurate. Please see the previous discussion for more information.
..Barnes.. 07/05/2025
.PREV DISCUSSION... /ISSUED 0129 AM CDT Sat Jul 05 2025/
...Synopsis...
A belt of modest flow across will be in place across the northern
states during the day on Sunday with a weak cutoff low off the coast
of California and a ridge across much of the southwestern CONUS.
Some of the mid-level flow around the periphery of the cutoff low
may mix down to the surface across portions of the Great Basin
during the afternoon amid low RH. However, given a lack of strong
flow throughout the column across the region, any Elevated fire
weather conditions are expected to be localized and transient.
Therefore, no highlights have been added at this time.
U.S. Day 3-8 Fire Weather Outlook
ZCZC SPCFWDD38 ALL
FNUS28 KWNS 052140
Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0440 PM CDT Sat Jul 05 2025
Valid 071200Z - 131200Z
...Synopsis...
As next week arrives, a subtropical ridge is expected to be in place
over the Southwest and Southern Plains, while quasi-zonal flow
impacts much of the northern CONUS. A mid to upper-level cyclone off
the northern CA coast is expected to open and move onshore early Day
5/Wednesday morning, and then fill as it traverses the northern
Rockies and phases with a long-wave trough over northwestern Canada.
The ridge over the Southwest is expected to remain in place through
the extended period, with modest westerlies crossing the Rockies and
northern Great Plains.
...Day 4/Tuesday...
Some increase in mid-level flow is still anticipated to accompany
the aforementioned cyclone from northern CA into the Great Basin.
Hot and dry conditions under the ridge will precede the approach of
this feature, likely resulting in even more receptive fuels across
the region by Day 4/Tuesday. Although there's some disagreement
within the extended model guidance and ensembles with regards to
wind speed, confidence remains high enough to continue with low
critical probabilities across southeastern and eastern NV
considering a deeply mixed boundary layer will be in place.
In addition to hot, dry, and windy conditions across the Great
Basin, a small area of isolated dry thunderstorms appears possible
near and east of the southern Cascades of OR Day 4/Tuesday. Brief
mid to upper-level ascent associated with the opening closed low
should impact this region. However, confidence is not high enough to
introduce another area of low probabilities for lightning at this
time.
..Barnes.. 07/05/2025
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