Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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615
FXUS66 KHNX 221001
AFDHNX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
301 AM PDT FRI MAY 22 2015

.SYNOPSIS...
A TROUGH OF LOW PRESSURE CURRENTLY OVER THE WEST COAST WILL KEEP A
THREAT OF SHOWERS AND ISOLATED HIGH ELEVATION THUNDERSTORMS OVER THE
REGION THROUGH TODAY...LINGERING INTO SATURDAY. WEAK HIGH PRESSURE
WILL MOVE OVER THE AREA THIS WEEKEND WITH A WARMING AND DRYING TREND.

&&

.DISCUSSION...
COMPLEX UPPER LOW PRESSURE SYSTEM WITH MULTIPLE EMBEDDED VORTICIES
WILL MAKE FOR AN UNSTABLE PATTERN ACROSS THE CENTRAL CALIFORNIA
INTERIOR TODAY AND CONTINUING ACROSS THE SIERRA NEVADA THROUGH
THE WEEKEND. THE LOW WILL SLOWLY DRIFT EAST AS A DRIER NW FLOW
MOVES ACROSS THE REGION TOMORROW AND SUNDAY WITH ONLY SHOWERS AND
A FEW ISOLATED THUNDERSTORMS POSSIBLE IN THE SIERRA AND TEHACHAPI
MOUNTAINS. WE HAVE REMOVED THE THUNDER FROM THE SAN JOAQUIN
VALLEY FOR TODAY AS THE STRONGEST DYNAMICS REMAINS SOUTH.

AS THE LOW CENTER OPENS UP AND MOVES EAST NW FLOW SETS UP ON
MONDAY WITH CONTINUED SHOWERS POSSIBLE IN THE SIERRA. ZONAL FLOW
SETS UP BY TUESDAY WITH GRADUAL WARMING TREND AND DRY CONDITIONS
THROUGH THE WEEK.

&&

.AVIATION...
AREAS OF IFR AND MOUNTAIN OBSCURATIONS IN SHOWERS OVER THE SOUTHERN
SIERRA NEVADA WITH ISOLATED THUNDERSTORMS POSSIBLE FROM 18Z FRI THRU
06Z SAT. LOCAL MVFR IN SHOWERS IN THE SAN JOAQUIN VALLEY...SOUTHERN
SIERRA FOOTHILLS AND TEHACHAPI MOUNTAINS. OTHERWISE...VFR CONDITIONS
WILL PREVAIL OVER THE REMAINDER OF THE CENTRAL CA 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.

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 05-22      104:1967     67:2010     71:1892     43:1909
KFAT 05-23      103:1967     65:1916     71:2000     44:1960
KFAT 05-24      103:1943     64:1916     68:2001     41:1953

KBFL 05-22      102:2001     68:2010     73:1967     36:1903
KBFL 05-23      107:1904     67:2010     73:2000     44:1903
KBFL 05-24      107:1982     68:1980     76:1982     41:1916
&&

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

$$

PUBLIC...JDB
AVN/FW...DCH
SYNOPSIS...JDB

WEATHER.GOV/HANFORD



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