Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 030355
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
855 PM PDT SUN AUG 2 2015

.SYNOPSIS...
HIGH PRESSURE ALOFT BUILDING TO THE SOUTHEAST WILL CREATE HOT
WEATHER OVER PORTIONS OF THE DESERTS...WITH NEAR NORMAL HIGH
TEMPERATURES ELSEWHERE THROUGH MID WEEK. NIGHT/MORNING LOW CLOUDS
WILL CONTINUE ACROSS COASTAL AND COASTAL VALLEY AREAS. A DEEPER
MARINE LAYER...BREEZY WEST WINDS IN THE MOUNTAINS AND DESERTS AND
BELOW NORMAL HIGH TEMPERATURES TO END THE WEEK AS LOW PRESSURE
MOVES ACROSS NORTHERN CA.

&&

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

AT 8 PM PDT...WATER VAPOR SATELLITE IMAGERY DISPLAYED AN UPPER-
LEVEL LOW AROUND 575 MILES WEST OF EUREKA...CA...AND A BROAD
UPPER-LEVEL RIDGE STRETCHING FROM WESTERN TEXAS TO OFF THE
CENTRAL BAJA COAST. FOG SATELLITE SHOWED PATCHY STRATUS
DEVELOPING ALONG THE COAST. THE 03/0000 UTC KNKX SOUNDING
DISPLAYED THE BASE OF THE MARINE LAYER INVERSION AROUND 1500 FT
MSL. LOW CLOUDS WILL CONTINUE TO DEVELOP ALONG THE COAST
OVERNIGHT...PUSHING INTO THE INLAND VALLEYS SIMILAR TO LAST NIGHT.

THE CURRENT PATTERN WILL REMAIN MOSTLY IN PLACE THROUGH MID
WEEK...WITH HEIGHTS ALOFT SLOWLY BUILDING THROUGH THE PERIOD AND
DRY...SOUTHWEST FLOW CONTINUING. 850 MB TEMPERATURES WILL
INCREASE TO NEAR 30 DEG C BY WEDNESDAY AFTERNOON OVER SOUTHERN
CA...WHICH WILL HELP HIGH TEMPERATURES TO RISE TO 108 TO 117 F OVER
PORTIONS OF THE COACHELLA VALLEY...EASTERN SAN GORGONIO PASS AND
SAN DIEGO COUNTY DESERTS BY MID-WEEK. A HEAT ADVISORY HAS BEEN
ISSUED FOR THOSE AREAS FROM MONDAY AFTERNOON THROUGH EARLY
THURSDAY EVENING. A SHALLOW MARINE LAYER WILL HELP DEVELOP
NIGHT/MORNING LOW CLOUDS/FOG OVER THE COAST AND COASTAL VALLEYS
THROUGH THE PERIOD...WITH THE MARINE LAYER KEEPING THOSE AREAS NOT
AS HOT AS FAR INLAND. BREEZY WESTERLY WINDS WILL DEVELOP IN THE
USUAL MOUNTAIN PASSES AND DESERT MOUNTAIN SLOPES LOCATIONS EACH
AFTERNOON/EVENING.

THE AFOREMENTIONED UPPER-LEVEL LOW WILL BUDGE BY THURSDAY AND
MOVE INLAND ACROSS NORTHERN CA BY THE END OF THE WEEK. THIS WILL
LOWER HEIGHTS ALOFT...AND INCREASE ONSHORE FLOW CREATING BREEZY
WEST WINDS ACROSS THE MOUNTAINS AND DESERTS...ALONG WITH A DEEPER
MARINE LAYER.

&&

.AVIATION...
03330Z...COAST/VALLEYS...BKN-OVC013-016 TOPS TO 020 RETURNING TO
THE COASTAL AIRPORTS THIS EVENING...AND MOVING 15-25 SM INLAND
THROUGH 13Z ON MON. CIGS WILL LOWER TO OVC010-015 TROUGH 12Z. THE
HIGHER COASTAL TERRAIN WILL BE LOCALLY OBSCURED AND AREAS OF 3-
5SM VIS IN BR WILL DEVELOP IN THE VALLEYS AFT 08Z THROUGH ABOUT
16Z MON. THE CLOUDS ARE EXPECTED TO CLEAR BACK TO THE COASTAL
AIRPORTS BETWEEN 19-21Z MON.

MTNS/DESERTS...FEW CU OVER THE RIDGES IN THE AFTERNOONS...OTHERWISE
JUST SCT CLOUDS AOA FL200 WITH UNRESTRICTED VIS THROUGH MONDAY.

&&

.MARINE...
830 PM...NORTHWEST WINDS 15 TO 20 KT OVER THE OUTER
WATERS MONDAY THROUGH WEDNESDAY WITH GUSTS FROM 20 TO 25 KNOTS. A
SMALL CRAFT ADVISORY MAY BE NEEDED THEN.

&&

.SKYWARN...
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...HEAT ADVISORY FROM 2 PM MONDAY TO 7 PM PDT THURSDAY FOR
     COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-SAN GORGONIO PASS
     NEAR BANNING.

PZ...NONE.
&&

$$

PUBLIC...JJT
AVIATION/MARINE...JAD


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