565
FXUS66 KHNX 011813
AFDHNX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HANFORD CA
1113 AM PDT FRI MAY 1 2026
KEY MESSAGES
1. SLIGHT CHANCE FOR THUNDERSTORMS ACROSS THE SIERRA NEVADA
FRIDAY, INCREASING CHANCES ON SATURDAY.
2. ABOVE AVERAGE TEMPERATURES ACROSS THE CWA ON FRIDAY AND
SATURDAY.
3. A CLOSED-LOW ENTERS THE AREA OVER THE WEEKEND TO EARLY NEXT
WEEK WITH THE BEST PROBABILITY FOR WEATHER IMPACTS SUNDAY
THROUGH TUESDAY.
DISCUSSION
A BUILDING SHORTWAVE RIDGE WILL LEAD TO ABOVE NORMAL
TEMPERATURES BOTH TODAY AND INTO TOMORROW, WITH HIGHS NEAR 90
DEGREES IN THE VALLEY BOTH DAYS. THIS RIDGE WILL ALSO BE SHORT-
LIVED AS IT IS EXPECTED TO BE PUSHED EAST BY SATURDAY AFTERNOON
INTO THE EVENING, WHICH MAY ALSO LEAD TO THUNDERSTORM
DEVELOPMENT AS A CUT-OFF LOW APPROACHES FROM THE WEST.
THIS CUT-OFF WILL CONTINUE TO INCREASE THUNDERSTORM
PROBABILITIES FOR EACH AFTERNOON IT IS ALOFT, THROUGH AT LEAST
TUESDAY AFTERNOON. THESE CHANCES WILL BE CONCENTRATED TO THE
SIERRA NEVADA AND IT'S FOOTHILLS AND CURRENTLY HAVE VALUES OF
10-20%, WITH HIGHER CHANCES ALONG THE CREST OF THE RANGE. THE
INITIAL WAVE WILL ALSO LEAD TO A RAPID DECREASE IN TEMPERATURES
BEGINNING ON SUNDAY AND PEAKING ON TUESDAY WITH THE VALLEY
LIKELY TO SEE HIGHS IN THE LOWER 70'S, WHICH WOULD BE ABOUT 10
DEGREES BELOW NORMAL FOR THIS TIME OF YER. AS THE CUT- OFF GETS
CLOSER TO THE REGION, RAIN CHANCES FOR THE MOUNTAINS AND
FOOTHILLS INCREASE, WITH THE HIGHEST PROBABILITIES ON MONDAY
INTO TUESDAY. THESE VALUES ARE CURRENTLY 25-50% FOR AT LEAST A
QUARTER INCH OF RAINFALL OVER 24 HOURS. THERE IS ALSO A 15-25%
CHANCE FOR A TENTH OF AN INCH OF RAINFALL IN THE VALLEY, MAINLY
ON THE EAST SIDE ADJACENT TO THE FOOTHILLS.
AFTER THIS CUT-OFF EXITS THE AREA, ANOTHER RIDGE IS EXPECTED TO
BUILD IN ITS PLACE, LEADING TO ANOTHER WARMING TREND FOR THE
REGION LIKELY TO PUSH HIGHS ABOUT 10 DEGREES ABOVE NORMAL BY
NEXT FRIDAY.
AVIATION
VFR CONDITIONS WILL PREVAIL FOR THE NEXT 24 HOURS OVER CENTRAL
CALIFORNIA.
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
WEATHER.GOV/HANFORD
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