Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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000
FXUS66 KHNX 302354 AAA
AFDHNX

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
454 PM PDT WED JUL 30 2014

.UPDATE...
UPDATED AIR QUALITY ISSUES SECTION.

&&

.SYNOPSIS...
UPPER LEVEL REMNANTS OF TROPICAL DEPRESSION HERNAN PASSING THROUGH
THE REGION WILL CONTINUE A NORTHEAST MOVEMENT INTO THE NORTHERN
PLAINS. A WEAK HIGH PRESSURE RIDGE HAS BEGUN TO BUILD INTO THE
CENTRAL INTERIOR THROUGH THE REMAINDER OF THE WEEK.

&&

.AVIATION...
ISOLATED THUNDERSTORMS OVER THE SAN JOAQUIN VALLEY AND THE SIERRA
NEVADA FOOTHILLS THROUGH 00Z THURSDAY...AND WIDELY SCATTERED SHOWERS
AND THUNDERSTORMS WITH LOCAL MVFR CONDITIONS POSSIBLE OVER THE
SOUTHERN SIERRA NEVADA THROUGH 06Z THURSDAY. OTHERWISE...VFR
CONDITIONS WILL PREVAIL ACROSS THE CENTRAL CALIFORNIA INTERIOR
DURING THE NEXT 24 HOURS.

&&

.PREV DISC... /ISSUED 305 PM PDT WED JUL 30 2014/

DISCUSSION...
REMNANT MOISTURE FROM FORMER TROPICAL STORM HERNAN MOVED INTO
CENTRAL CALIFORNIA OVERNIGHT ALONG WITH WEAK SHORTWAVES IN THE
SOUTHWEST FLOW ALOFT. THIS WAS ENOUGH TO TRIGGER ISOLATED SHOWERS
AND THUNDERSTORMS IN THE SAN JOAQUIN VALLEY THIS MORNING AND
EARLY AFTERNOON AS WELL AS IN THE SIERRA NEVADA AND FOOTHILLS. THE
FOCUS OF THE CONVECTION HAS BEEN OVER FRESNO AND TULARE COUNTIES.
THE THUNDERSTORM THREAT IS EXPECTED TO END IN THE SAN JOAQUIN
VALLEY BY LATE AFTERNOON BUT CONTINUE IN THE SIERRA THROUGH THE
EVENING AS THIS FIRST BATCH OF MOISTURE MOVES EAST. SATELLITE
DOES SHOW ADDITIONAL MOISTURE OFFSHORE AND ALONG THE COAST THAT IS
CONTINUING TO MOVE TOWARD CENTRAL CALIFORNIA. THERE DOES NOT
APPEAR TO BE ANY ORGANIZED SHORTWAVE WITH THIS MAINLY HIGH LEVEL
MOISTURE AND THE 18Z NAM12 MOVES IT RAPIDLY NORTHEAST THIS
EVENING...SO ANY PRECIPITATION LEFT IN THE VALLEY EARLY THIS
EVENING WILL BE LIGHT SHOWERS OR SPRINKLES.

BEYOND TODAY...THE MOISTURE WILL BE PUSHED EASTWARD TONIGHT WITH
ENOUGH MOISTURE AND INSTABILITY REMAINING FOR ISOLATED
THUNDERSTORMS OVER THE HIGHER ELEVATIONS OF THE SIERRA NEVADA
THURSDAY AND FRIDAY. BY THE WEEKEND...HIGH PRESSURE CONTINUES TO
BE CENTERED OVER THE FOUR-CORNERS REGION. MONSOONAL MOISTURE WILL
BE DRAWN NORTHWARD AROUND THE CENTER OF THE HIGH INTO SOUTHERN
CALIFORNIA AND NEVADA. AT THIS TIME IT LOOKS LIKE THIS MOISTURE
WILL STAY MAINLY TO THE EAST OF THE SIERRA WITH JUST A SLIGHT
CHANCE NEAR THE CREST THROUGH EARLY NEXT WEEK.

TEMPERATURE WISE...DO NOT SEE ANY SIGNIFICANT CHANGE IN
TEMPERATURES THE NEXT SEVERAL DAYS WITH HIGHS HOLDING SLIGHTLY
ABOVE NORMAL. THIS MEANS A CONTINUATION OF 100+ DEGREE
TEMPERATURES FOR THE SAN JOAQUIN VALLEY THROUGH AT LEAST SUNDAY.

&&

.AIR QUALITY ISSUES...
ON THURSDAY JULY 31 2014... UNHEALTHY FOR SENSITIVE GROUPS IN
FRESNO AND KERN COUNTIES AND SEQUOIA NATIONAL PARK AND FOREST.
FURTHER INFORMATION IS AVAILABLE AT VALLEYAIR.ORG

&&

.CERTAINTY...

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

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 07-30      114:1898     80:1966     83:2003     57:1975
KFAT 07-31      114:1908     83:1976     81:1908     53:1895
KFAT 08-01      112:1908     79:1933     86:1908     56:1888

KBFL 07-30      112:1908     67:1955     82:1980     45:1955
KBFL 07-31      110:1943     60:1916     79:1982     55:1905
KBFL 08-01      112:1979     86:1985     80:2000     53:1912
&&

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

$$

UPDATE...JDB
AVN/FW...SANGER
PREV DISCUSSION...BEAN
SYNOPSIS...PJ

WEATHER.GOV/HANFORD







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