Area Forecast Discussion
Issued by NWS San Diego, CA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS66 KSGX 270447
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
847 PM PST MON JAN 26 2015

.SYNOPSIS...
LOW PRESSURE CENTERED OFF THE COAST WILL MOVE TO THE NORTH ON
TUESDAY CARRYING THE SHOWERS WITH IT. DRY AND COOLER ON TUESDAY WITH
CLOUDS LINGERING IN SOME AREAS. A WEAK HIGH PRESSURE RIDGE WILL
BRING SLIGHTLY WARMER WEATHER WITH MORE SUN ON WEDNESDAY. ANOTHER
DEVELOPING LOW PRESSURE SYSTEM WILL BRING INCREASING CLOUDS AGAIN
AND A CHANCE OF SHOWERS AT TIMES THURSDAY INTO THE WEEKEND.

&&

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

RAIN WAS WIDESPREAD FROM THE COAST TO THE DESERTS TODAY. MOST AREAS
RECEIVED LESS THAN ONE-QUARTER INCH...WITH THE LEAST ALONG THE
COAST...AND THE MOST IN THE VALLEYS AND MOUNTAINS. THE SAN DIEGO
COUNTY DESERTS DID QUITE WELL THOUGH WITH SOME AMOUNTS OVER ONE-
QUARTER INCH. GREATEST AMOUNTS AROUND ONE-HALF INCH FELL ON THE FAR
INLAND VALLEYS AND MOUNTAINS. THE SNOW LEVEL REMAINED ABOVE 8500
FEET SO THE WINTER WEATHER ADVISORY FOR THE SAN BERNARDINO MTS HAS
BEEN CANCELLED.

AFTER A SOMEWHAT SOGGY DAY...THE SHOWERS WERE WINDING DOWN THIS
EVENING. RADAR SHOWED JUST A FEW LEFT AND THEY WERE MOVING RAPIDLY
FROM THE SOUTH AT 30-35 MPH...HELPING TO KEEP FURTHER ACCUMULATIONS
LIGHT. SURFACE PRESSURE GRADIENTS SHOWED STRONG ONSHORE TRENDS BUT
REMAINED WEAK OFFSHORE FROM THE DESERTS. SOUTHEAST WINDS WERE STILL
GUSTY AT 25-30 MPH IN SOME MOUNTAIN LOCATIONS. THE 00Z MIRAMAR
SOUNDING SHOWED NEAR SATURATION IN THE 9K-12K FT LAYER..BUT HAD
MOISTENED CONSIDERABLY ALL THE WAY DOWN THROUGH 4K FT...HELPING TO
BOOST THE PW TO NEARLY ONE INCH. SOME IR ENHANCEMENT WAS STILL
OCCURRING IN SATELLITE IMAGERY...BUT IT WAS WELL NE OF THE CWA.

BASED ON WATER VAPOR IMAGERY...THE LOW PRESSURE CENTER RESPONSIBLE
FOR OUR RAINFALL WAS MOVING RAPIDLY NORTHWARD AND WAS CENTERED WELL
WEST OF SAN CLEMENTE ISLAND AT 04Z. THE LOW SHOULD LEFT NE ACROSS
CENTRAL CA ON TUE...TURNING OUR WINDS ALOFT BACK FROM THE WEST...
CLEARING OUT MOST OF THE HIGH-LEVEL MOISTURE AND CLOUDS. EVEN WITH
MORE SUNSHINE...A COOLER AIRMASS WILL BE IN PLACE...AND SOME LOWER
CLOUDS WILL LINGER...SO TUE WILL BE A BIT COOLER.

A WEAK RIDGE WILL TRAVERSE THE REGION ON WED...FOLLOWED BY A
DEVELOPING TROUGH FOR THE LATTER HALF OF THE WEEK. THE TROUGH WILL
ADVECT IN ADDITIONAL MOISTURE BUT IS QUITE WEAK INITIALLY. THE
MODELS SHOW IT DEEPENING AND DEVELOPING INTO A CUTOFF LOW BY FRI.
MODELS ALSO SHOW MOISTURE WRAPPING INTO THE CENTER FROM THE SOUTH
WITH THE BROAD CIRCULATION AROUND IT COVERING SOCAL. SO THERE WILL
BE A CHANCE OF MOSTLY LIGHT SHOWERS AT TIMES INTO THE WEEKEND AND
WITH MORE CLOUDS...THE DAYS WILL BE SLIGHTLY COOLER.

WARMER AGAIN LATE IN THE WEEKEND AS THE UPPER LOW SINKS SOUTH AND
OFFSHORE FLOW DEVELOPS. THE OFFSHORE WINDS MAY BECOME STRONG AND
GUSTY AGAIN BY SUNDAY...BUT THEN WEAKEN AS THE UPPER LOW DEPARTS AND
A RIDGE BUILDS ALOFT. THE RIDGE WILL BRING FAIR...DRY...AND WARMER
DAYS ONCE AGAIN AS WEAK OFFSHORE FLOW PREVAILS AT THE SURFACE EARLY
NEXT WEEK.

&&

.AVIATION...
2701430Z...RAIN SHOWERS WILL CLEAR THE TAF SITES BY 08Z. PRIOR TO
08Z...VIS VALUES BELOW 3-5 SM AND CIGS NEAR 3000 FT WILL BE POSSIBLE
IN AREAS OF SHOWER ACTIVITY...MAINLY OVER SAN BERNARDINO COUNTY.
AFTER 08Z...P6SM WITH CIGS BETWEEN 4000 AND 7000 FEET WILL PREVAIL
WEST OF THE MOUNTAINS...WITH LOCAL CIGS 1800 TO 3000 FEET OVER THE
DESERTS...THROUGH 12Z TUESDAY. FOR 12Z TUESDAY TO 06Z
WEDNESDAY...SCT-BKN CIGS BETWEEN 5000 AND 8000 FEET...AND A FEW HIGH
CLOUDS AOA 20000 FEET. NO WIND CONCERNS ARE ANTICIPATED AT LOCAL TAF
SITES THOUGH 06Z WEDNESDAY.

&&

.MARINE...
830 PM....NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH SATURDAY
EVENING.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.

PZ...NONE.

&&

$$

PUBLIC...JAD
AVIATION/MARINE...BA







USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.