Forecast Discussions mentioning ACARS, received at FSL on 03/14/00

...SYNOPSIS... THE MARINE LAYER AND WEAK ONSHORE FLOW WILL BRING LOW CLOUDS AND LOCALLY DENSE FOG TO COASTAL SECTIONS THROUGH WEDNESDAY. THIS WILL KEEP TEMPERATURES NEAR THE COAST IN THE 60S...WHILE FARTHER INLAND IT WILL BE MUCH WARMER WITH HIGHS IN THE 70S AND 80S. IN THE DESERTS...TEMPERATURES WILL CLIMB ABOVE 90.

...DISCUSSION... ACARS DATA SHOW THE MARINE LAYER DEPTH BETWEEN 2500 AND 3000 FEET. ABOVE THIS MARINE LAYER TEMPERATURES HAVE SOARED INTO THE 70S IN THE FOOTHILLS...AND INTO THE LOW 90S IN THE DESERTS. EVEN THE MOUNTAINS CLIMBED INTO THE 60S AND 70S. MOST COASTAL STATIONS REMAINED IN THE 60S.

THE COASTAL EDDY SOUTH OF SAN CLEMENTE ISLAND WILL DRIFT SLOWLY SOUTH TONIGHT. MESO SCALE MODELS HINT AT ANOTHER WEAK EDDY FORMING IN THE SAN DIEGO BIGHT OVERNIGHT...WHICH WILL BRING CLOUDS AND DENSE FOG BACK INTO THE COASTAL REGIONS AFTER SUNSET...AND INTO SOME INLAND AREAS BY DAYBREAK. FLAT RIDGE FORECAST TO BUILD ACROSS SOCAL LATE TONIGHT...AND THIS WILL SHRINK THE DEPTH OF THE MARINE LAYER FOR FASTER DISSIPATION OF CLOUDS AND FOG TUESDAY MORNING.

HIGHER HEIGHTS AND AN INCREASE IN 850 MB TEMPS ON TUESDAY WILL BRING SEVERAL DEGREES OF WARMING EXCEPT AT THE COAST. DESERTS WILL REACH INTO THE 90S.

WEAK SHORTWAVE TROF ON WEDNESDAY IS FORECAST OFF THE COAST. LOWER HEIGHTS WILL RESULT IN A DEGREE OR TWO OF COOLING INLAND AND MTN AREAS WEDNESDAY.

IN THE EXTENDED...SOUTHERN STREAM ENERGY OF THE POLAR JET BREAKS OFF FROM THE MEAN FLOW AND DRIFTS SOUTH TO FORM A CUTOFF LOW OFF THE COAST OF NORTHERN MEXICO FRIDAY. CURRENT FORECAST TRACK PLACES THE CUTOFF TOO FAR WEST AND SOUTH TO HAVE MAJOR IMPACT ON SOCAL WEATHER...SO WILL KEEP THE EXTENDED DRY WITH NEAR OR ABOVE NORMAL TEMPERATURES.

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MOEDE

...SYNOPSIS... HIGH PRESSURE ALOFT AND WEAKENING ONSHORE FLOW WILL BRING A WARMER DAY TUESDAY. A VERY WEAK LOW-PRESSURE TROUGH WILL BRING SLIGHT COOLING WEDNESDAY. OTHERWISE...EXCEPT FOR SOME LATE NIGHT AND EARLY MORNING LOW CLOUDS AND FOG...THE WEATHER WILL BE FAIR.

...DISCUSSION... IT IS A QUIET NIGHT TONIGHT AS LOW CLOUDS/FOG ARE ABSENT IN OUR FORECAST AREA SO FAR...THOUGH SOME ARE OVER COASTAL LA COUNTY. THE MARINE LAYER IS SLIGHTLY OVER 1500 FEET DEEP...DOWN FROM THE 12Z SOUNDING AND ACARS SOUNDINGS FROM TODAY. PRESSURE GRADIENTS ARE NOT SHOWING ANY STRONG TRENDS AS THE PRESSURE FALLS OVER OR/WA/BC ARE TOO FAR NORTH TO REALLY AFFECT US...OTHER THAN PREVENTING ANY STRONG WESTERN US SURFACE HIGH FROM DEVELOPING AND GIVING US OFFSHORE FLOW. THE ABSENCE OF ANY STRONG EDDY COMBINED WITH THE ABOVE ELEMENTS TO DELAY TO LOW CLOUDS AND FOG THIS EVENING. THIS...COMBINED WITH SLIGHT WARMING ALOFT AND A TREND TOWARDS WEAKER ONSHORE FLOW...WILL HELP BRING A WARMER DAY TO MOST AREAS ON TUESDAY...ESPECIALLY COASTAL VALLEYS.

A WEAK TROUGH WILL MOVE THROUGH FROM NW TO SE WEDNESDAY...SO TEMPS SHOULD BE A BIT COOLER. ABOVE NORMAL TEMPS SHOULD PREVAIL LATE IN THE WEEK...AS LONG AS THE REMNANTS OF THE TROUGH WHICH WILL BE A MINOR CUT-OFF TO OUR SOUTHWEST STAYS FAR ENOUGH AWAY.

AN UPDATE WAS ISSUED AROUND 815 PM.

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MAXWELL