Westwood, California Weather Forecast Discussion

223
FXUS65 KREV 080909
AFDREV
Area Forecast Discussion
National Weather Service Reno NV
209 AM PDT Mon Sep 8 2025
.KEY MESSAGES...
* Breezy winds arrive each afternoon through midweek with the strongest
  gusts expected today.
* Steady cooling will result in much cooler temperatures throughout
  the week.
* Showers and thunderstorms return this week with best chances on
  Wednesday and Thursday.
&&
.DISCUSSION...
According to the latest RAP upper air analysis, the CWA has a
southwesterly upper air flow as it is between a strong upper air low
residing off the coast of OR/Northern CA to the west and a Rocky
Mountain upper air ridge to the west this morning. Forecast
guidance shows the low continuing a eastward progress approaching
the Pacific coast and getting closer to the CWA through the day.
As a result of this upper air pattern, the CWA expects to see
increased southwest-west winds today gusting up to around 30-40
mph with wind prone areas possibly seeing gusts pushing the 50 mph
mark. As these winds will cause travel and recreation concerns, a
Lake Wind Advisory has been issued for both Lake Tahoe and
Pyramid Lake today. While Northeastern CA sees a 10-15% chance for
an isolated shower in the late afternoon/evening today, the remainder
of the region looks to stay on the dry side. As such, there are
some elevated fire weather concerns within the region today due to
the increased winds and dry conditions.
Speaking of fires, the latest run of the HRRR model shows smoke and
haze from the Garnet Fire and other wildfires in CA continuing to
filter into the CWA today. The higher concentrations of smoke for
the area look to be in Mono County (see the current Dense Smoke
Advisory) while surrounding areas could see some locally reduced
visibilities as well with a good portion of the region seeing hazy
skies. While the increased winds during the day may disperse some
of the smoky skies, southern portions of the region closer to the
fire will not have as much of a reprieve as the smoke looks to
build back up a bit in Mono and Mineral Counties again tonight.
Please continue to visit GBUAPCD.org and AirNow.gov for the
latest information on air quality today.
The temperature forecast today and going through the middle of
the week continues the cooling trend with the upper low moving
towards the CWA and keeping the warmer air away to the south of
the region. While today`s daytime highs expect to be a few degrees
lower than those experienced yesterday, the forecast calls for
highs in the 60s and 70s generally through the end of the work
week. Some Sierra communities look to have freezing or near
freezing overnight lows during the week with Wednesday night being
the coldest night having a 40-60% NBM probability of 32F or
lower. The remaining portions of the region have lows ranging
between the 40s and the lower 50s in the forecast. By the weekend,
extended guidance shows the low departing the region allowing for
temperatures to start to rebound.
The aforementioned Pacific low expects to also bring greater and
more widespread precipitation chances to the CWA tomorrow that
persist through at least Thursday. Tuesday`s chances for showers
and storms look to be 20-40% and then the precipitation chances
will increase to their greatest on Wednesday and Thursday with a
30-60% probability. The precipitation chances then taper off to
less than 15% on Friday as a drying pattern is seen entering the
weekend. Model guidance shows the potential for higher CAPE values
in areas closer to the OR border on Wednesday and Thursday, so
these locations may see a better chance for thunderstorms. The
highest peaks of the Sierra could possibly see a few tenths of an
inch of snow as well with temperatures getting cold enough. Will
monitor these midweek precipitation chances as a good portion of
the region could see a measurable amount by Thursday night and
will share more forecast details when they become available. -078
&&
.AVIATION...
While most area TAF sites expect VFR conditions today, the primary
weather concern today will be southwest/west surface gusts of
20-30 kts during the afternoon. Mountain wave turbulence and LLWS
impacts will also be likely as well with these winds. Otherwise,
mostly dry conditions are expected across the region today.
KMMH looks to be the outlier TAF site that will see sub-VFR
conditions mostly due to smoke filtering into Mono and Mineral
Counties from the Garnet Fire in CA. There may be a brief break
between 8/22Z-9/04Z when winds pick up allowing for VFR conditions
at KMMH, but models show smoke returning and lowering the visibility
once again tonight. Increased smoke production from the Garnet
Fire will also further impact slantwise visibilities across the
region. -078
&&
.REV Watches/Warnings/Advisories...
NV...Lake Wind Advisory from 11 AM this morning to 11 PM PDT this
     evening NVZ002-004.
CA...Lake Wind Advisory from 11 AM this morning to 11 PM PDT this
     evening CAZ072.
Dense Smoke Advisory until 11 AM PDT this morning CAZ073.
&&
$$

NWS REV Office Area Forecast Discussion