Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 282217
AFDHNX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
317 PM PDT THU APR 28 2016

.SYNOPSIS...
CLEARING SKIES AND WARMER TEMPERATURES NEXT SEVERAL DAYS AS WEAK
HIGH PRESSURE MOVES OVER THE REGION. HOWEVER, A WEAK SYSTEM WILL
BRUSH RETURN THE AREA SATURDAY BRINGING AN INCREASE IN CHANCES FOR
PRECIPITATION OVER THE HIGHER ELEVATIONS. ANOTHER WEATHER SYSTEM
POSSIBLE BY THE END OF NEXT WEEK.

&&

.DISCUSSION...
LOTS OF CLOUD COVER ACROSS THE SAN JOAQUIN VALLEY KEEPING
TEMPERATURES BELOW THE EXPECTED HIGHS. LOTS OF VARIANCE IN
TEMPERATURES WITH CLEARING SKIES IN THE NORTH AND WEST SECTORS OF
THE VALLEY WITH TEMPERATURES RISING INTO THE LOWER 70S. THE
ATMOSPHERE REMAINS UNSTABLE WITH PLENTY OF MOISTURE TO FUEL
SHOWERS AND THUNDERSTORMS. A FEW STORMS ARE DEVELOPING THIS
AFTERNOON OVER THE HIGH SIERRA. SOME LIGHT SHOWERS COULD DRIFT
INTO THE FOOTHILLS WITH A MODERATE NORTH WIND FLOW. OTHERWISE
EXPECT STORM ACTIVITY TO REMAIN IN THE SIERRA HIGH COUNTRY AND
QUICKLY DIMINISH AFTER SUNSET WITH THE LOSS OF DAYTIME HEATING
TRIGGER. MODELS SHOW MOISTURE POOLING TOWARDS THE NORTH FACING
SLOPES OF THE TEHACHAPIS AND SOUTH END OF THE VALLEY DUE TO THE
UPSLOPE WIND.

THE CENTER OF THE UPPER LOW EXTEND FROM SOUTHERN NEVADA SOUTH TO
THE COLORADO RIVER. THE LOW WILL DRIFT SLOWLY EAST TONIGHT
REACHING THE FOUR CORNERS AREA FRIDAY. MODELS PROG SUFFICIENT
MOISTURE AND INSTABILITY FOR ISOLATED SHOWERS OR A THUNDERSTORMS
FRIDAY AFTERNOON WITH DAYTIME HEATING AS THE MAIN TRIGGER.

ANOTHER SHORT WAVE QUICKLY DROPS DOWN FROM THE PACIFIC NW FRIDAY
NIGHT AND OVER SOCAL BY SATURDAY AFTERNOON. THIS WILL BRING
A GOOD CHANCE FOR MOUNTAIN SHOWERS OVER THE WEEKEND WITH A SLIGHT
CHANCE OVER THE DESERT. MODEL INSTABILITY INDICATE SOME ISOLATED
THUNDERSTORMS WILL BE POSSIBLE AS WELL. SHORT WAVE RIDGING BUILDS
IN MONDAY FOR DRY CONDITIONS THROUGH MIDWEEK. AN AMPLIFIED TROUGH
OVER THE EAST PACIFIC  MAY MOVE IN LATER IN THE WEEK FOR ANOTHER
CHANCE OF PRECIPITATION.

THE ONSHORE SURFACE PRESSURE GRADIENT WILL CONTINUE TO PRODUCE
SOME BREEZY CONDITIONS THIS EVENING WITH GUSTY WINDS THROUGH AND
BELOW THE KERN COUNTY MOUNTAIN PASSES. THE GRADIENT TURNS MORE
NORTH- SOUTH ON FRIDAY NIGHT WITH THE NEXT SYSTEM...BRINGING
INCREASED WINDS OVER THE SAN JOAQUIN VALLEY FRIDAY NIGHT THROUGH
SATURDAY.

TEMPERATURES WILL WARMING FRIDAY TO NEAR TO SLIGHTLY ABOVE NORMAL.
SLIGHT COOLING ARRIVES ON SATURDAY THEN WARMING THROUGH THE
MIDDLE OF NEXT WEEK WITH HIGHS CLIMBING TO SEVERAL DEGREES ABOVE
NORMAL.

&&

.AVIATION...
MOUNTAIN OBSCURATIONS AND IFR CONDITIONS POSSIBLE IN CLOUDS OVER THE
SIERRA NEVADA AND KERN COUNTY MOUNTAINS. GUSTY WINDS BELOW THE
PASSES OF THE KERN COUNTY MOUNTAINS AND DESERT THRU 06Z FRIDAY.
OTHERWISE...VFR CONDITIONS WILL PREVAIL OVER THE CENTRAL
CALIFORNIA INTERIOR DURING THE NEXT 24 HOURS.

&&

.AIR QUALITY ISSUES...
NONE.

&&

.CERTAINTY...

THE LEVEL OF CERTAINTY FOR DAYS 1 AND 2 IS MEDIUM.
THE LEVEL OF CERTAINTY FOR DAYS 3 THROUGH 7 IS MEDIUM.

CERTAINTY LEVELS INCLUDE LOW...MEDIUM...AND HIGH. PLEASE VISIT
WWW.WEATHER.GOV/HNX/CERTAINTY.PHP FOR ADDITIONAL INFORMATION
AN/OR TO PROVIDE FEEDBACK.

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

PUBLIC...MV
AVN/FW...MOLINA
PREV DISCUSSION...DCH
SYNOPSIS...WP

WEATHER.GOV/HANFORD


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