151
FXUS66 KHNX 271814
AFDHNX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HANFORD CA
1114 AM PDT SUN SEP 27 2026
KEY MESSAGES
1. MINOR HEAT RISK THROUGH THE WEEKEND INTO MONDAY AS
TEMPERATURES COOL TO EARLY FALL NORMALS. TEMPERATURES CLIMB
BEGINNING TUESDAY.
2. LOW PRESSURE TROUGH APPROACHES 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 MONDAY EVENING AND MORNING
RESPECTIVELY.
DISCUSSION
AS THE LOW PRESSURE TROUGH APPROACHES CENTRAL CALIFORNIA, WINDS
ARE EXPECTED TO INCREASE FROM THIS AFTERNOON THROUGH AT LEAST
MONDAY EVENING AND A SMALL AMOUNT OF MOISTURE MOVING IN FROM THE
PACIFIC MAY RESULT IN ISOLATED SHOWERS AND THUNDERSTORMS ALONG
THE SIERRA NEVADA CREST TOMORROW AFTERNOON. AS OF THIS MORNING,
LAKE WIND ADVISORIES HAVE BEEN ISSUED FOR BOTH LAKE ISABELLA AND
SAN LUIS RESERVOIR. THE LAKE ISABELLA ADVISORY WILL BE IN
EFFECT STARTING AT 1PM TODAY AND RUN THROUGH 7PM MONDAY, WHILE
THE ADVISORY FOR THE SAN LUIS RESERVOIR WILL START AT THE SAME
TIME AND RUN THROUGH 7AM MONDAY.
THUNDERSTORM CHANCES WITH THIS SYSTEM ARE AROUND 10 TO 20% FROM
11AM THROUGH 5PM AS OF CURRENT MODEL RUNS, ALONG WITH A 20-35%
CHANCE FOR A TENTH OF AN INCH OF RAINFALL DURING THAT TIME
PERIOD, MAINLY IN THE HIGHER ELEVATIONS OF THE SIERRA NEVADA
RANGE. THERE IS ALSO A CHANCE FOR A TRACE OF SNOWFALL ABOVE 9500
FEET AS SNOW LEVELS DECREASE TO THAT LEVEL BY MONDAY AFTERNOON.
THIS TROUGH WILL ALSO LEAD TO A SIGNIFICANT COOLDOWN WHEN
COMPARED TO CLIMATOLOGICAL NORMS, WITH HIGHS IN THE VALLEY
ONLY RISING INTO LOWER 80'S ON MONDAY AS THE AXIS OF THE TROUGH
SWINGS INLAND OVER THE REGION. BUT THIS COOLDOWN IS EXPECTED TO
BE SHORT LIVED, AS A STRONG RIDGE IS EXPECTED TO BUILD IN OVER
THE SOUTHWEST BEGINNING ON TUESDAY AND STICKING AROUND THROUGH
AT LEAST NEXT WEEKEND. THIS WILL CAUSE TEMPERATURES TO RISE INTO
THE MID TO UPPER 90'S, ABOUT 10 TO 15 DEGREES ABOVE NORMAL FOR
THIS TIME OF YEAR (NORMAL IN THE VALLEY BEING LOWER TO MID
80'S). THE CLIMATE PREDICTION CENTER ALSO HAS THIS RIDGE
REMAINING SOMEWHAT IN PLACE THROUGH THE WEEK AFTER THIS, AS OUR
CWA IS UNDER A 70-80% CHANCE FOR LIKELY ABOVE NORMAL TEMPS
DURING THE 6 TO 10 DAY OUTLOOK AND INCREASING TO 70-90% FOR THE
8 TO 14 DAY OUTLOOK.
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.
EW
WEATHER.GOV/HANFORD
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