290
FXUS66 KHNX 061206
AFDHNX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HANFORD CA
406 AM PST SAT DEC 6 2025
UPDATE
UPDATED AVIATION SECTION.
KEY MESSAGES
1. FOG AND LOW CLOUDS WILL CONTINUE EACH NIGHT AND MORNING ACROSS
THE SAN JOAQUIN VALLEY INTO EARLY NEXT 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 UNTIL NEXT WEEK, AS THE HIGH PRESSURE PATTERN CONTINUES
OVER THE REGION.
DISCUSSION
A RIDGE OF HIGH PRESSURE WILL STRENGTHEN AND MOVE FURTHER
INLAND. THIS WILL ALLOW TEMPERATURES TO RISE, AT LEAST IN THE
MOUNTAINS AND DESERT. HOWEVER, FOG AND STRATUS WILL PERSIST OVER THE
CENTRAL VALLEY AS WELL AS THE COASTAL RANGES, LOWER SIERRA
FOOTHILLS, AND THE KERN COUNTY MOUNTAINS FOR AT LEAST THE NEXT FEW
DAYS. DENSE FOG WILL CONTINUE AT TIMES TONIGHT INTO SATURDAY ALONG
MAJOR HIGHWAYS, SUCH AS INTERSTATE 5 THROUGH THE GRAPEVINE IN KERN
COUNTY AND HIGHWAY 152 THROUGH PACHECO PASS. IT IS ALSO POSSIBLE
DENSE FOG WILL OCCUR ANYWHERE THAT THE STRATUS DECK TOUCHES THE
LOWER SIERRA FOOTHILLS AND TEHACHAPI MOUNTAINS, INCLUDING AT
ELEVATIONS AROUND 1,500 TO 2,500 FEET. OTHERWISE, THE CENTRAL VALLEY
MAY FOG BACK UP ANYWHERE THE STRATUS DECK CLEARS. CURRENTLY, SHORT
TERM HIGH RESOLUTION GUIDANCE SHOWS A 40-50 PERCENT CHANCE OF DENSE
FOG ANYWHERE IN THE CENTRAL VALLEY AND LOWER CHANCES (ABOUT 20-30
PERCENT) TOWARDS THE FOOTHILLS AND COASTAL RANGES THROUGH THE LATE
MORNING HOURS ON SATURDAY.
THIS DRY AND STABLE PATTERN WILL LAST UNTIL NEXT WEEK AND BEYOND.
THE LATEST CPC OUTLOOKS HAVE THE VALLEY, THE SIERRA NEVADA, AND THE
MOJAVE DESERT UNDER A 70 TO 90 PERCENT CHANCE OF ABOVE AVERAGE
TEMPERATURES DUE TO THE PERSISTING RIDGE. HOWEVER, THE OUTLOOKS SHOW
A SHIFT FROM A 40 TO 50 PERCENT PROBABILITY OF BELOW AVERAGE
PRECIPITATION TO A 33 TO 40 PERCENT PROBABILITY OF ABOVE AVERAGE
PRECIPITATION FOR THE MUCH OF THE VALLEY AND SIERRA NEVADA.
AVIATION
IFR CEILINGS AND VISIBILITIES ARE EXPECTED TO PREVAIL THROUGH
20Z SATURDAY BEFORE IMPROVING TO MVFR. LIFR CONDITIONS WILL ALSO
PERSIST IN THE COASTAL RANGES, SIERRA FOOTHILLS, AND THE KERN
COUNTY MOUNTAINS DUE TO THE LOW STRATUS DECK.
AIR QUALITY ISSUES
ON SATURDAY DECEMBER 6 2025, FIREPLACE/WOOD STOVE BURNING
STATUS IS: NO BURNING UNLESS REGISTERED IN FRESNO, KERN, 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 NOON PST TODAY FOR CAZ300-335.
PUBLIC/AVIATION....BSO/EW
WEATHER.GOV/HANFORD
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