Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 262147
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
147 PM PST Wed Feb 26 2020

.SYNOPSIS...
Strong gusty east to northeast winds in the mountains and valleys
will decrease in coverage and intensity Thursday and Friday. The
high temperatures west of the mountains will peak Thursday, and on
Friday farther inland. A cold low pressure system from the
northwest is expected to move through southern California Sunday
into Monday, bringing much cooler conditions, lowering snow
levels, showers, and gusty mountain and desert winds. Dry weather
with a warming trend is expected for Tuesday and Wednesday.

&&

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

.SHORT TERM...(Today through Friday)...
Massive surface high drifting slowly south over the Central
Rockies in Colorado continues to unleashed high end north to
northeast winds, especially in San Diego County.  WRF model
indicates the wind will slowly die down over the next 24 hours,
falling to sub-warning levels mid afternoon today, and continuing
at advisory levels thereafter into midday Thursday. Too dry for
low clouds through at least Thursday morning. Unseasonably warm
conditions will continue through Friday with high temperatures
west of the mountains peaking Thursday, and on Friday farther
inland. The warmest temperatures on Thursday for inland coastal
areas into the western valleys could peak around 90 degrees.

&&

.LONG TERM...(Saturday through Tuesday)...
Significant cooling is planned for Saturday as cold low pressure
from the northwest moves southward off the West Coast. This low
should push through southern California on Sunday into Monday.
Much lower temperatures with lowering snow levels, showers, and
gusty winds in the mountains and deserts can be expected to
develop. High temperatures in some inland coastal areas and
western valley areas could be around 25 degrees cooler on Sunday
and Monday than on Thursday of this week.

The chances for precipitation are mostly 50 percent or less in
line with the NBM due to continuing track and timing differences.
The chances for precipitation will most likely be increased for a
portion of this time period as the timing and track issues are
better resolved. Dry weather with a warming trend is expected for
Tuesday and Wednesday of next week.

&&

.AVIATION...
262050Z...Mostly clear with SCT high clouds AOA 25K FT MSL with
unrestricted through tonight. Northeast to east surface winds will
continue to be gusty in the mountains and foothills around 20 to 30
kt with gusts to 45 kt. These winds will gradually decrease late
this afternoon and into early evening. Coastal TAF sites may see
brief periods of east winds gusting 15-25 kts this afternoon. Expect
moderate to strong up/downdrafts in lee of mountains and LLWS nearly
anywhere the strong winds don`t surface. While winds decrease this
afternoon through tonight, some winds 25 to 35 kts will continue in
some of the foothill locations into Thursday morning.

&&

.MARINE...
No hazardous marine weather is expected through Saturday. A storm
arriving Sunday could bring westerly wind gusts over 20 kt with
areas of swell 6-8 FT.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...High Wind Warning until 4 PM PST this afternoon for San Diego
     County Mountains-San Diego County Valleys.

     Wind Advisory until noon PST Thursday for San Diego County
     Mountains-San Diego County Valleys.

     Wind Advisory until noon PST Thursday for Riverside County
     Mountains-San Bernardino County Mountains-San Bernardino
     and Riverside County Valleys-The Inland Empire-San Gorgonio
     Pass Near Banning-Santa Ana Mountains and Foothills.

PZ...NONE.

&&

$$

PUBLIC...Small
AVIATION/MARINE...APR



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