Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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000
FXUS66 KHNX 281212
AFDHNX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
412 AM PST WED JAN 28 2015

...UPDATED FOR DENSE FOG ADVISORY...

.SYNOPSIS...ANOTHER LOW PRESSURE SYSTEM WILL BRING A RENEWED CHANCE OF
SHOWERS TO MAINLY THE MOUNTAINS AND DESERT WEDNESDAY NIGHT INTO FRIDAY.
OTHERWISE EXPECT MAINLY DRY CONDITIONS WITH NEAR TO SLIGHTLY ABOVE AVERAGE
TEMPERATURES THROUGH THE NEXT SEVERAL DAYS.

&&

.DISCUSSION...
FOG HAS BECOME DENSE ACROSS PARTS OF THE SAN JOAQUIN VALLEY EARLY
THIS MORNING...FALLING TO LESS THAN 1/4 MILE. THE DENSE FOG WILL
LIKELY SPREAD A BIT MORE BY DAYBREAK. VISIBILITIES ARE EXPECTED
TO IMPROVE BY MID-MORNING.

&&

.PREV DISCUSSION... /ISSUED 222 AM PST WED JAN 28 2015/

DISCUSSION...
PATCHY FOG IS BEGINNING TO DEVELOP IN THE SAN JOAQUIN VALLEY EARLY
THIS MORNING AND WILL LIKELY BECOME DENSE IN SOME AREAS TOWARD
DAYBREAK. EXPECT IT TO CLEAR QUICKLY THIS MORNING AS ANOTHER LOW
PRESSURE SYSTEM APPROACHES THE AREA.

HIGH LEVEL CLOUD COVER WILL BE ON THE INCREASE TODAY AS THE UPPER
TROUGH MOVES TOWARDS THE COAST. THE DEEPEST MOISTURE WITH THIS
SYSTEM WILL REMAIN WELL TO OUR SOUTH. BUT THERE IS EXPECTED TO BE
ENOUGH ENERGY AND MOISTURE TO BRING SCATTERED SHOWERS TO THE
MOUNTAINS AND DESERT AREAS TONIGHT THROUGH FRIDAY. THE SAN JOAQUIN
VALLEY IS EXPECTED TO REMAIN DRY. THERE COULD BE SOME PATCHY
FOG THURSDAY AND FRIDAY MORNINGS...BUT THERE SHOULD BE ENOUGH
CLOUD COVER TO PREVENT IT FROM BEING WIDESPREAD.

ONCE THE UPPER LOW EXITS TO THE EAST SATURDAY MORNING...HIGH
PRESSURE WILL BUILD OVER THE REGION SATURDAY INTO SUNDAY. BOTH THE
GFS AND ECMWF ARE INDICATING A FLATTENING OF THE RIDGE ON MONDAY
AS A SHORTWAVE MOVES ACROSS THE PACIFIC NORTHWEST AND BRUSHES
NORTHERN CALIFORNIA. AT THIS TIME...IT LOOKS LIKE ANY CHANCE OF
PRECIPITATION WILL STAY TO OUR NORTH MONDAY. THE RIDGE THEN
QUICKLY REBUILDS TUESDAY AND REMAINS THROUGH THE WEEK. AREAS OF
NIGHT AND MORNING FOG ARE LIKELY TO FORM IN THE SAN JOAQUIN
VALLEY BEGINNING SATURDAY MORNING AND CONTINUING THROUGH THE WEEK.

&&

.AVIATION...
VISIBILITIES WILL BECOME VLIFR WITH DENSE FOG BY 12Z FOR ALL
TERMINALS EXCEPT KBFL. VISIBILITIES ARE FORECAST TO IMPROVE
SIGNIFICANTLY BETWEEN 18Z AND 19Z. OTHERWISE...PATCHY MVFR
VISIBILITY WILL PREVAIL AFTER 19Z THROUGH THE EARLY EVENING HOURS
BEFORE A RETURN OF DENSE FOG EARLY THURSDAY MORNING.

&&

.AIR QUALITY ISSUES...
ON WEDNESDAY JANUARY 28 2015... FIREPLACE/WOOD STOVE BURNING
STATUS IS: NO BURNING UNLESS REGISTERED IN FRESNO... KERN...
KINGS... MADERA... MERCED AND TULARE COUNTIES.
FURTHER INFORMATION IS AVAILABLE AT VALLEYAIR.ORG

&&

.CERTAINTY...

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

THIS INFORMATION IS PROVIDED AS PART OF A TRIAL PROJECT CONDUCTED
BY THE NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD.
CERTAINTY LEVELS INCLUDE LOW...MEDIUM...AND HIGH. PLEASE VISIT
WWW.WEATHER.GOV/HNX/CERTAINTY.PHP /ALL LOWER CASE/ FOR ADDITIONAL
INFORMATION AND/OR TO PROVIDE FEEDBACK.

&&

.CLIMATE...
             RECORDS
SITE DATE    HI_MAX:YEAR LO_MAX:YEAR HI_MIN:YEAR LO_MIN:YEAR

KFAT 01-28       78:1986     41:1963     50:2003     23:1975
KFAT 01-29       73:1960     43:2002     55:1911     24:1902
KFAT 01-30       74:1984     41:1923     56:1911     25:1946

KBFL 01-28       77:1988     47:1957     52:1981     27:1957
KBFL 01-29       74:1986     42:2002     54:1986     27:1903
KBFL 01-30       77:1911     44:1951     60:1911     23:1902
&&

.HNX WATCHES/WARNINGS/ADVISORIES...
DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING CAZ089>092.

&&

$$

PUBLIC...BEAN
AVN/FW...RILEY
PREV DISCUSSION...BEAN
SYNOPSIS...BEAN

WEATHER.GOV/HANFORD


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