Wind Advisory 21, NWS San Diego, CA

258 
WWUS76 KSGX 121207
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
507 AM PDT Sun Mar 12 2023

CAZ065-121500-
/O.CON.KSGX.WI.Y.0021.000000T0000Z-230312T1500Z/
San Gorgonio Pass Near Banning-
507 AM PDT Sun Mar 12 2023

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 AM THIS MORNING...

* WHAT...West winds 30 to 40 mph with gusts 55 to 65 mph.

* WHERE...San Gorgonio Pass Near Banning.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down. Areas of blowing dust and sand 
  could briefly limit visibility for drivers in the northern 
  Coachella Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

037 
WWUS76 KSGX 121500
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
800 AM PDT Sun Mar 12 2023

CAZ065-121600-
/O.EXP.KSGX.WI.Y.0021.000000T0000Z-230312T1500Z/
San Gorgonio Pass Near Banning-
800 AM PDT Sun Mar 12 2023

...WIND ADVISORY WILL EXPIRE AT 8 AM PDT THIS MORNING...

Westerly winds are weakening but localized gusts to 35 mph will
continue until about 10 am.

$$

For more information from the National Weather Service visit
http://weather.gov/sandiego

Area Forecast Discussion
National Weather Service San Diego CA
140 PM PST Sat Mar 11 2023

.SYNOPSIS...
Scattered showers over and west of the mountains today will
decrease in coverage this afternoon before ending tonight.
Gusty west winds will impact the mountains and deserts through
this evening as well. Sunday and Monday will be dry, but another
Pacific storm will bring more rain and high elevation snow late
Tuesday through Wednesday. Brief drying occurs for Thursday and
Friday, with more unsettled weather to follow through the weekend
and early next week.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

Weak disturbances aloft combining with some residual moisture
will continue to support on and off light shower activity through
this afternoon and evening. Additional rainfall totals will be
light, generally 0.10 inch or less for most locations, with
potential for slightly higher amounts on the coastal mountain
slopes due to upsloping effects. Gusty west winds will also
continue through this evening in the mountains and desert
foothills, strongest winds generally over mountain ridges.

Weak ridging builds in on Sunday and Monday leading to a few
degrees of warming with dry conditions as well. Highs each day
will remain a few degrees cooler than seasonal normals across
areas west of the mountains, with slightly warmer than normal
highs occurring in the deserts.

Tuesday will see the approach of yet another winter storm with
precipitation beginning during the daytime. IVT guidance from the
GFS and ECMWF has the stronger and more persistent moisture
transport occurring during the late afternoon and evening hours on
Tuesday, with GEFS and ECMWF guidance also suggesting a moderate
AR tap during this time as well. QPF guidance from the ECMWF EFI
suggests a significant precipitation event occurring Tuesday
afternoon through Wednesday. All of these signals suggest yet
another widespread precipitation event, with potentially
significant totals yet again in the mountains. Precipitation looks
to end from west to east by Wednesday evening as the storm system
departs to our east.

Southwesterly flow at lower levels will not only support more
effective moisture transport, but also warm air advection leading
to high snow levels at the onset of the Tuesday- Wednesday system.
Snow levels at this time look to start around 9000 feet, but then
steadily fall to around 6000-7000 feet Wednesday morning when
700mb temperatures fall to around -2 to -4C. Confidence in
exactly when snow levels fall and how they will line up with
precipitation intensity remains low at this time, lending more
uncertainty into actual snowfall totals at higher elevations.
Regardless, there will be higher potential for accumulating snow
at or near 7000 feet with the Tuesday-Wednesday storm compared to
our most recent storm.

Ridging then builds in for Thursday and Friday, favoring dry
weather and a few degrees of warming. The overall upper level
pattern over the Central and Eastern Pacific then looks to remain
unsettled through the weekend, supporting at least slight chances
for additional precipitation through early next week. This is
supported in EPS/GEFS guidance, as well as the 6-10 Day Outlook
from the CPC which indicates a 40-50% chance of cooler than normal
temperatures during this time, as well as a 40-50% chance of
higher than normal precipitation. In other words, the stormy and
unsettled pattern does not look to relent any time soon.

&&

.AVIATION...
112130Z...ISOLD -SHRA/DZ will continue through 12Z Sun from the
mountain crests west to the coast, along with continued widespread
stratus/fog. BKN/OVC cloud bases will mostly be 500-1000 ft MSL
through 18Z Sun, except 1000-2000 ft MSL at times this afternoon,
with tops 6000 ft MSL. Areas of VIS 1-3 miles in BR/-SHRA will
continue through 18Z Sun. Widespread terrain obscurations will occur
through 18Z Sun. Some increase in cloud bases will occur after 18Z
Sun with partial afternoon clearing. In the deserts, SCT-BKN clouds
above 10000 ft MSL will continue at times through Sun with mostly
unrestricted VIS.

Southwest to west winds will continue over portions of the
mountains and deserts through 12Z Sun with surface gusts 35-55 kt
over the ridges, desert slopes, east of passes, and locally in the
deserts. Winds will gradually decrease after 12Z Sun. STG
up/downdrafts, LLWS, and rotors are likely over the mountains and
adjacent desert areas.

&&

.MARINE...
No hazardous marine conditions expected through Tuesday. South winds
will increase Tuesday night and becoming westerly Wednesday with
gusts over 20 kt possible in the coastal waters.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.

&&

PUBLIC...Adams
AVIATION/MARINE...Maxwell