Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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000
FXUS66 KHNX 011052
AFDHNX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
352 AM PDT SUN MAY 1 2016

.SYNOPSIS...
A FEW LINGERING SHOWERS AND THUNDERSTORMS OVER THE REGION
TODAY...THEN CLEARING SKIES AND WARMER TEMPERATURES MONDAY AND
TUESDAY AS WEAK HIGH PRESSURE MOVES OVER THE REGION. ANOTHER
WEATHER SYSTEM WILL MOVE INTO THE REGION WEDNESDAY INCREASING
PRECIPITATION CHANCES FOR THE SECOND PART OF THE WEEK.

&&

.DISCUSSION...
AN UPPER LOW CONTINUES TO BE CENTERED OVER ARIZONA...BUT THE BROAD
LOW CIRCULATION COVERS MUCH OF THE GREAT BASIN. ANOTHER WEAK
SHORTWAVE WILL MOVE SOUTH ALONG THE WEST SIDE OF THE LOW TODAY.
THIS WILL TRIGGER A FEW SHOWERS AND THUNDERSTORMS IN THE MOUNTAINS
AND DESERT THIS AFTERNOON. IT MAY ALSO HELP TO PRODUCE A FEW
SHOWERS ALONG THE COASTAL HILLS THIS AFTERNOON WHICH MAY THEN
DRIFT EAST INTO THE SAN JOAQUIN LATE THIS AFTERNOON AND EARLY
EVENING.

THERE COULD BE A FEW LINGERING SHOWERS IN THE SIERRA NEVADA
MONDAY AFTERNOON AS THE LOW FINALLY MOVES EAST AND A RIDGE OF
HIGH PRESSURE MOVES INLAND. BY TUESDAY AFTERNOON THE RIDGE WILL
SHIFT TO A POSITION NEAR THE ROCKIES...SETTING UP AN OMEGA BLOCK
ACROSS THE U.S WITH A DEEP TROUGH IN THE EASTERN STATES AND
ANOTHER TROUGH OF LOW PRESSURE ALONG THE WEST COAST. THE TROUGH
ALONG THE WEST COAST DEEPENS AND DEVELOPS INTO A CLOSED LOW OFF
THE CALIFORNIA COAST WEDNESDAY. DUE TO THE OMEGA BLOCKING
PATTERN...THE LOW WILL NOT BE ABLE TO MOVE ANYWHERE VERY FAST.
THUS IT WILL REMAIN OVER CALIFORNIA THROUGH FRIDAY BEFORE
BEGINNING TO MOVE EASTWARD NEXT WEEKEND. THIS WILL CREATE AN
UNSETTLED WEATHER PATTERN OVER CENTRAL CALIFORNIA FOR THE LAST
HALF OF THE WEEK. A FEW SHOWERS OR THUNDERSTORMS COULD DEVELOP IN
THE SIERRA WEDNESDAY AFTERNOON. THE CHANCES OF SHOWERS AND
THUNDERSTORMS INCREASES ACROSS THE ENTIRE REGION THURSDAY AND
FRIDAY AND CONTINUES INTO THE WEEKEND.

FOR TEMPERATURES...A WARMING TREND WILL OCCUR TODAY THROUGH
TUESDAY WITH HIGHS AS MUCH AS 5 TO 10 DEGREES ABOVE NORMAL. THEN
TEMPERATURES WILL BEGIN TO COOL ON WEDNESDAY AS THE LOW MOVES IN.
BY THURSDAY AND FRIDAY...TEMPERATURES WILL BE 5 TO 10 DEGREES
BELOW NORMAL FOR EARLY MAY. FOR THE SAN JOAQUIN VALLEY THIS MEANS
THAT TEMPERATURES WILL GO FROM THE MID 80S TO NEAR 90 DEGREES
TUESDAY TO THE 70S ON THURSDAY AND FRIDAY. NORMAL IS NEAR 80
DEGREES FOR THE FIRST WEEK OF MAY.

&&

.AVIATION...
EXPECT AREAS OF MVFR WITH LOCAL IFR POSSIBLE 18Z SUNDAY TO 06Z
MONDAY DUE TO SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS IN THE
SIERRA NEVADA...AS WELL AS THE KERN COUNTY MOUNTAIN AND DESERT AREAS.
LOCAL MVFR POSSIBLE IN ISOLATED SHOWERS OVER THE SAN JOAQUIN VALLEY
00Z-06Z MONDAY. 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...BEAN
AVN/FW...JEB
SYNOPSIS...BEAN

WEATHER.GOV/HANFORD



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