288
FXUS66 KHNX 210127 AAA
AFDHNX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HANFORD CA
526 PM PST MON JAN 20 2025
UPDATE TO AIR QUALITY ISSUES SECTION
KEY MESSAGES
1. DRY WEATHER WILL CONTINUE THROUGH FRIDAY WITH ABOVE AVERAGE
HIGH TEMPERATURES AND BELOW AVERAGE LOW TEMPERATURES ACROSS THE
SAN JOAQUIN VALLEY.
2. STRONG NORTHEAST WINDS WILL CONTINUE ACROSS EASTERN KERN
COUNTY THIS EVENING. THERE IS UP TO AN 80 PERCENT PROBABILITY
FOR WIND GUSTS OF 45 MPH OR HIGHER ALONG THE MOJAVE DESERT
SLOPES. A WIND ADVISORY REMAINS IN EFFECT UNTIL 4 AM TUESDAY.
3. WIDESPREAD SUB-FREEZING TEMPERATURES ARE FORECAST ACROSS THE
RURAL AREAS OF THE SAN JOAQUIN VALLEY TONIGHT AND TUESDAY
NIGHT. A FREEZE WARNING IS IN EFFECT.
DISCUSSION
VISIBLE IMAGERY IS INDICATING THAT SKIES HAVE
CLEARED OUT ACROSS THE SAN JOAQUIN VALLEY FOLLOWING A MORNING OF
DENSE FOG AND LOW CLOUDS WHICH PERSISTED UNTIL EARLY THIS
AFTERNOON IN A FEW SPOTS FROM FRESNO NORTHWARD ALONG THE SR 99
CORRIDOR. MEANWHILE, A DRY SHORTWAVE TROUGH DROPPING SOUTHWARD
TO THE EAST OF OUR AREA IS INTERACTING WITH AN OFFSHORE RIDGE
THAT IS SHIFTING INLAND TO PRODUCE A STRONG OFFSHORE GRADIENT
OVER EASTERN KERN COUNTY WHICH IS RESULTING IN STRONG NORTHEAST
WIND GUSTS OVER SOME OF THE CANYONS AND DOWNSLOPE FAVORED AREAS
IN THE SIERRA NEVADA AND ALSO ALONG THE MOJAVE DESERT SLOPES
WHERE A WIND ADVISORY REMAINS IN EFFECT THROUGH 400 AM PST
TUESDAY. THE OTHER IMPACT THAT THIS INTERACTION BETWEEN THE
SHORTWAVE TO OUR EAST AND THE STRENGTHENING RIDGE IS THAT IT
WILL PUSH DRIER AIR INTO THE SAN JOAQUIN VALLEY TONIGHT WHICH
WILL MAKE THE PROBABILITY FOR DENSE FOG LESS LIKELY ON TUESDAY
MORNING THAN THIS MORNING. THE POE FOR VISIBILITY DROPPING BELOW
A QUARTER MILE IN MERCED AND MADERA ON TUESDAY MORNING IS ONLY
BETWEEN 10 AND 20 PERCENT. HOWEVER, THE PRESENCE OF DRIER AIR
WILL ALSO RESULT IN COOLER MINIMUM TEMPERATURES WITH CLEAR
SKIES AND LIGHT WINDS EXPECTED TO PREVAIL OVER THE SAN JOAQUIN
VALLEY. THE POE OF MINIMUM TEMPERATURES BELOW 32 DEG F IN RURAL
PORTIONS OF THE SAN JOAQUIN VALLEY IS BETWEEN 40 AND 70 PERCENT
ON TUESDAY AND WEDNESDAY MORNINGS. A FREEZE WARNING WAS ISSUED
FOR MUCH OF THE SAN JOAQUIN VALLEY FROM MIDNIGHT PST TONIGHT
UNTIL 900 AM PST WEDNESDAY. DAYTIME TEMPERATURES WILL BE 2 TO 5
DEG F ABOVE NORMAL ON TUESDAY AND WEDNESDAY.
A WARMING TREND IS EXPECTED TO TAKE PLACE ON THURSDAY AS THE
RIDGE SHIFTS FURTHER INLAND INTO CA. THE RIDGE WILL THEN BEGIN
TO BREAK DOWN ON FRIDAY AS AN UPPER LOW DROPS INTO THE PAC NW
FROM THE GULF OF AK. THE MEDIUM RANGE ENSEMBLE MEANS DROP THIS
SYSTEM INTO THE GREAT BASIN OVER THE WEEKEND WHICH WILL BRING
CHANCES OF PRECIPITATION TO OUR AREA ON SATURDAY AND SUNDAY
ALONG WITH COOLER TEMPERATURES AS SLIGHTLY BELOW NORMAL
TEMPERATURES ARE EXPECTED ACROSS OUR ARE ON SUNDAY AND MONDAY.
AVIATION
00Z UPDATE:
IN THE SAN JOAQUIN VALLEY, WIDESPREAD MVFR AND LOCAL IFR IN
MIST AND HAZE. VFR CONDITIONS WILL PREVAIL ELSEWHERE ACROSS THE
AREA FOR THE NEXT 24 HOURS.
AIR QUALITY ISSUES
ON TUESDAY JANUARY 21 2025, UNHEALTHY FOR SENSITIVE GROUPS IN
FRESNO, KERN, AND TULARE COUNTIES. FIREPLACE/WOOD STOVE BURNING
STATUS IS: NO BURNING FOR ALL IN FRESNO AND KERN COUNTIES. NO
BURNING UNLESS REGISTERED IN KINGS, MADERA, AND TULARE COUNTIES.
BURNING DISCOURAGED IN MERCED COUNTY, AND 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
WIND ADVISORY UNTIL 4 AM PST TUESDAY FOR CAZ338.
FREEZE WARNING FROM MIDNIGHT TONIGHT TO 9 AM PST WEDNESDAY FOR
CAZ301>303-305-306-309>313-315-316.
PUBLIC/AVIATION...DAS
IDSS...JPK
WEATHER.GOV/HANFORD
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