901
FXUS66 KHNX 301243
AFDHNX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HANFORD CA
543 AM PDT WED SEP 30 2026
UPDATE
UPDATED AVIATION SECTION.
KEY MESSAGES
1. A RIDGE WILL BUILD THIS WEDNESDAY, LEADING TO TEMPERATURES WELL
ABOVE SEASONAL NORMALS THROUGH AT LEAST THIS WEEKEND.
2. MODERATE HEAT RISK IS EXPECTED ACROSS OUR FORECAST AREA FROM
THURSDAY INTO NEXT WEEK.
DISCUSSION
THE COUPLE DAYS OF COOLER WEATHER WILL UNFORTUNATELY BE SHORT
LIVED AS A RIDGE BUILDS INTO THE SOUTHWEST BEGINNING ON
WEDNESDAY AND SEEMINGLY PARKS ITSELF IN PLACE FOR THE NEXT WEEK
OR MORE. THIS WILL CAUSE TEMPERATURES TO RISE 10 TO 15 DEGREES
ABOVE NORMAL, KEEPING THE SUMMER-LIKE HEAT EVEN AFTER THE
ASTRONOMICAL BEGINNING OF FALL THAT OCCURRED ON THE AUTUMNAL
EQUINOX A WEEK AGO. BY THURSDAY, MODERATE HEAT HEAT WILL ENTER
THE VALLEY BEFORE BECOMING WIDESPREAD BY FRIDAY AND MAINTAINING
A SIMILAR AREA THROUGH MID NEXT WEEK. TEMPERATURES ARE EXPECTED
TO PEAK ON SATURDAY, AND THE SOUTHERN VALLEY HAS A 50-70% CHANCE
TO SEE THE RETURN OF TRIPLE DIGITS IN THE AFTERNOON. THESE
CHANCES DECREASE THE NEXT DAY, BUT ONLY TO 40-60%.
THESE CONDITIONS ARE NOT LIKELY TO LET UP IN THE WEEK AFTER NEXT
EITHER, AS THE CLIMATE PREDICTION CENTER CONTINUES TO HAVE OUR
CWA UNDER THE 80-90% LIKELY ABOVE NORMAL TEMPERATURES FOR BOTH
THE 6 TO 10 DAY AND 8 TO 14 DAY OUTLOOKS, THOUGH THE AREA OF
THAT PERCENTILE IS REDUCED IN THE LATTER OUTLOOK, SUGGESTING A
POTENTIAL WEAKENING OF THE RIDGE. BUT EVEN WITH THAT,
TEMPERATURES MAY CONTINUE TO BE ABOVE NORMAL, JUST NOT TO THE
CURRENT EXPECTED EXTREME.
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
NONE.
EW/CM
WEATHER.GOV/HANFORD
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