420
FXUS66 KHNX 091646
AFDHNX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HANFORD CA
946 AM PDT TUE JUN 9 2026
KEY MESSAGES
1. MINOR HEAT RISK ACROSS THE LOWER ELEVATIONS OF CENTRAL
CALIFORNIA TUESDAY WITH A WARMING TREND AND INCREASING RISK
STARTING WEDNESDAY.
2. WIDESPREAD MODERATE HEAT RISK, INCLUDING TRIPLE-DIGIT HEAT,
IN THE LOWER ELEVATIONS THURSDAY UNTIL NEXT WEEKEND. POCKETS OF
MAJOR AND EXTREME HEAT RISK AS WELL.
3. PRACTICE SAFETY AROUND LAKES, RIVERS, AND STREAMS, AS WATER
IS STILL RUNNING COLD.
DISCUSSION
THE SECOND OF A PAIR OF TROUGHS OVER THE PACIFIC NORTHWEST IS
BEGINNING TO CLEAR THE AREA TODAY, AND WITH THAT WILL COME A
SIGNIFICANT WARMING TREND. THERE IS A 20-50% CHANCE OF HIGH
TEMPERATURES EXCEEDING THE 90-DEGREE MARK IN VALLEY AREAS SOUTH
OF FRESNO TODAY. ON WEDNESDAY, THERE IS A 60-80% CHANCE OF EXCEEDING
95 DEGREES FOR THE ENTIRE VALLEY, AND THERE IS A 40-80% CHANCE
OF EXCEEDING 100 DEGREES ON THURSDAY FOR THE ENTIRE VALLEY. THE
WORST OF THE HEAT IS EXPECTED TO CONTINUE INTO THE WEEKEND. THIS
WILL CREATE A PROLONGED PERIOD OF WIDESPREAD MODERATE HEAT
RISK, WITH SOME AREAS EXPERIENCING MAJOR AND EVEN EXTREME HEAT
RISK. IT IS EXTREMELY IMPORTANT TO PLAN AHEAD NOW BY REDUCING
OUTDOOR ACTIVITY, HAVING COOLING AND HYDRATION AVAILABLE, AND
HAVING A PLAN FOR VULNERABLE PEOPLE AND ANIMALS. HEAT PRODUCTS
WILL LIKELY BE ISSUED THIS WEEK.
WHILE RELATIVE HUMIDITY VALUES WILL BE ABOVE NORMAL TODAY, THEY
WILL RETURN TO NORMAL RANGES TOMORROW AND THE REST OF THE WEEK,
WITH MINIMUM RH VALUES IN THE 15-20% RANGE ACROSS THE VALLEY
EACH DAY AND 9-15% IN THE KERN DESERT. WHILE WIND IS NOT
EXPECTED TO BE A MAJOR CONCERN, THE HEAT AND DRY AIR WILL CREATE
ELEVATED FIRE CONCERNS, PARTICULARLY FRIDAY AND INTO THE
WEEKEND.
DESPITE THE HEAT, WATER IS STILL RUNNING COLD AND POSES A RISK
TO SWIMMERS, BOTH HUMAN AND ANIMAL. PRACTICE SAFETY AROUND
LAKES, RIVERS, AND STREAMS.
A COMPACT SHORTWAVE MAY BRING A MINOR DRY LIGHTNING RISK IN THE
UPPER SIERRA NEVADAS ON FRIDAY.
AVIATION
VFR CONDITIONS EXPECTED ACROSS THE CENTRAL CALIFORNIA INTERIOR
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.
PUBLIC...AC
AVIATION....AC
WEATHER.GOV/HANFORD
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