630
FXUS66 KHNX 281303 AAA
AFDHNX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HANFORD CA
603 AM PDT MON SEP 28 2026
UPDATE
UPDATED AVIATION SECTION.
KEY MESSAGES
1. MINOR HEAT RISK MONDAY AS TEMPERATURES COOL TO EARLY FALL
NORMALS. TEMPERATURES CLIMB BEGINNING TUESDAY.
2. LOW PRESSURE TROUGH MOVES THROUGH CALIFORNIA TODAY, BRINGING
COOLER TEMPERATURES AND A POSSIBILITY FOR PRECIPITATION ALONG
THE SIERRA NEVADA MOUNTAINS.
3. LOW BUT NOTABLE CHANCES (10-20%) FOR THUNDERSTORMS ACROSS
THE SIERRA NEVADA MONDAY.
4. LAKE WIND ADVISORIES FOR LAKE ISABELLA AND SAN LUIS RESERVOIR
AGAIN FROM SUNDAY AFTERNOON INTO THIS EVENING AND MORNING,
RESPECTIVELY.
DISCUSSION
MAJOR TROUGH CONTINUES TO SLIDE IN OVERNIGHT INTO MONDAY,
BRINGING COOLER TEMPERATURES AND SOME MOISTURE INTO THE AREA.
THERE IS A 80 PERCENT CHANCE AND HIGHER OF HIGHS BELOW 85
DEGREES IN THE VALLEY. WIND GUSTS INCREASE IN THE VALLEY AND
MOUNTAINS OVER THE AFTERNOON WITH A 5 TO 10 PERCENT CHANCE OF
GUSTS OF 25 MPH IN THE VALLEY. LAKE WIND ADVISORIES ARE ALREADY
IN EFFECT FOR LAKE ISABELLA AND SAN LUIS RESERVOIR INTO MONDAY
EVENING AND MORNING RESPECTIVELY.
THE MOISTURE FROM THE TROUGH HELPS BRING A 10 TO 20 PERCENT
CHANCE OF THUNDERSTORMS OVER THE SIERRA NEVADA. IN ADDITION,
THERE IS A 10 TO 40 PERCENT CHANCE OF AN INCH OF SNOW ON MONDAY
ABOVE 9,000 FEET. THE VALLEY, HOWEVER, HAS A 5 PERCENT CHANCE OR
LESS OF ANY PRECIPITATION. THE FOOTHILLS HAVE A 10 TO 25
PERCENT CHANCE OF ANY RAIN ON MONDAY. MEANWHILE THE HIGHER
ELEVATIONS SEES A 25 TO 50 PERCENT CHANCE OF A TENTH OF AN INCH
OF RAIN.
HOWEVER, TEMPERATURES BEGIN TO CLIMB AGAIN ON TUESDAY AS THE
TROUGH SLIDES AWAY. A RIDGE OF HIGH PRESSURE WILL SLIDE IN ON
WEDNESDAY BRINGING IN A 60 TO 80 CHANCE OF HIGHS OF 95 DEGREES
AND HIGHER IN THE VALLEY FROM THURSDAY INTO NEXT MONDAY. DRY
CONDITIONS WILL CONTINUE TO DOMINATE. THIS HOLDS UP WITH THE
CPC HAVING A 70 TO 90 PERCENT CHANCE OF ABOVE AVERAGE
TEMPERATURES IN THE 6-10 AND 8-14 DAY OUTLOOKS.
AVIATION
VFR CONDITIONS WILL PREVAIL FOR THE NEXT 24 HOURS.
AIR QUALITY ISSUES
NONE.
CERTAINTY
THE LEVEL OF CERTAINTY FOR DAYS 1 AND 2 IS HIGH.
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
LAKE WIND ADVISORY UNTIL 7 AM PDT MONDAY FOR CAZ300.
LAKE WIND ADVISORY UNTIL 7 PM PDT MONDAY FOR CAZ332.
JPK/CM
WEATHER.GOV/HANFORD
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