400
FXUS66 KHNX 091057
AFDHNX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HANFORD CA
257 AM PST TUE DEC 9 2025
UPDATE
UPDATED AVIATION SECTION.
KEY MESSAGES
1. FOG AND LOW CLOUDS WILL CONTINUE EACH NIGHT AND MORNING ACROSS
THE SAN JOAQUIN VALLEY THIS WEEK. DENSE FOG WILL ALSO DEVELOP
AT TIMES IN THE LOWER SIERRA FOOTHILLS, COASTAL RANGES, AND THE
GRAPEVINE.
2. A GRADUAL WARMING TREND WILL OCCUR IN THE MOUNTAINS AND
DESERT THIS WEEK, AS THE HIGH PRESSURE PATTERN CONTINUES OVER
THE REGION.
DISCUSSION
AS THE RIDGE OF HIGH PRESSURE MAINTAINS ITS GRIP ACROSS THE
SOUTHWEST, A STAGNANT WEATHER PATTERN WILL EXIST OVER THE REGION
AND KEEP CENTRAL CALIFORNIA DRY. LOW CLOUDS CONTINUE TO PLAGUE
THE SAN JOAQUIN VALLEY AS AFTERNOON HIGHS FALL SHORT OF THEIR
SEASONAL NORMAL VALUES. PROBABILITIES OF REACHING SEASONAL
NORMAL VALUES STRUGGLE TO REACH A PERCENTAGE HIGHER THAN 10
PERCENT FOR MUCH OF THE WEEK. ON THE CONTRARY, OUTSIDE OF THE
SAN JOAQUIN VALLEY, THE PROBABILITY OF REACHING 60 DEGREES SITS
IN BETWEEN 70 AND 95 PERCENT. WITH THESE HIGH PERCENTAGE VALUE
SHOWING UP FOR MUCH OF THE WEEK, A WARMING TREND IS IN STORE FOR
THE REGION. HOWEVER, JUST NOT FOR THE SAN JOAQUIN VALLEY.
IN THE REALM OF PRECIPITATION, ENSEMBLE MOISTURE ANALYSIS IS
SHOWING THE BLOCKING HIGH MAINTAINING ITS POSITION OVER THE
EASTERN PACIFIC, AND PLACING THE STEERING CURRENT IN THE
DIRECTION OF THE PACIFIC NORTHWEST. WITH LITTLE CHANGE IN THE
NEXT 5 DAY, CENTRAL CALIFORNIA WILL REMAIN DRY AND COVERED IN
LOW CLOUDS. LONGER RANGE ENSEMBLE ANALYSIS DOES SHOW A CHANGE IN
THE PATTERN WITH A HINT TOWARD THE INTRODUCTION OF PRECIPITATION
AS EARLY AS NEXT MONDAY (15 DEC 2025). IF THE PATTERN TOWARD
PRECIPITATION HOLDS, WILL INVESTIGATE THE EXTEND OF THE NEXT
STORM THAT COULD REACH CENTRAL CALIFORNIA.
AVIATION
IFR TO MVFR CEILINGS AND VISIBILITIES ARE EXPECTED TO PREVAIL
FOR MUCH OF THE SAN JOAQUIN VALLEY DURING THE NEXT 24 HOURS.
LIFR CONDITIONS WILL ALSO PERSIST IN THE COASTAL RANGES, SIERRA
FOOTHILLS, AND THE KERN COUNTY MOUNTAINS DUE TO THE LOW STRATUS
DECK. OTHERWISE, VFR CONDITIONS WILL PREVAIL IN THE SIERRA
NEVADA AND IN THE KERN COUNTY MOUNTAIN AND DESERT AREAS OVER
THE NEXT 24 HOURS.
AIR QUALITY ISSUES
ON TUESDAY DECEMBER 9 2025, UNHEALTHY FOR SENSITIVE GROUPS IN
FRESNO AND KERN COUNTIES. FIREPLACE/WOOD STOVE BURNING STATUS
IS: NO BURNING FOR ALL IN FRESNO AND KERN COUNTIES. NO BURNING
UNLESS REGISTERED IN KINGS, MADERA, MERCED, AND TULARE COUNTIES.
BURNING DISCOURAGED IN KERN (GREATER FRAZIER PARK AREA) AND
SEQUOIA NATIONAL PARK AND FOREST.
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.HTML FOR ADDITIONAL INFORMATION
AND/OR TO PROVIDE FEEDBACK.
HNX WATCHES/WARNINGS/ADVISORIES
DENSE FOG ADVISORY UNTIL 11 AM PST THIS MORNING FOR CAZ300-304-
308-313-316>322-334>336.
JPK/BSO
WEATHER.GOV/HANFORD
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