602
FXUS66 KHNX 191727
AFDHNX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HANFORD CA
1027 AM PDT TUE MAY 19 2026
KEY MESSAGES
1. LOW RELATIVE HUMIDITIES IN THE LOWER ELEVATIONS OF CENTRAL
CALIFORNIA BRINGS AT LEAST A MODERATE RISK OF FIRE DANGER THIS
WEEK.
2. WARMING TREND THROUGHOUT THE WEEK.
3. PRACTICE SAFETY AROUND AREA LAKES, RIVERS, AND STREAMS AS
WATER IS STILL RUNNING COLD.
DISCUSSION
WINDS WILL CONTINUE TO DIE DOWN TODAY AS THE INSIDE SLIDER FROM
THIS WEEKEND MOVES MORE EASTWARD. AS WE CONTINUE ON WITH THE
WEEK, HIGH PRESSURE WILL BEGIN TO BUILD ALONG THE WEST COAST
WHICH WILL CONTRIBUTE TO A WARMING TREND BEGINNING TODAY AND
EXTENDING TO THE END OF THE WEEK. THERE IS MODERATE TO HIGH
PROBABILITY (60 TO 80 PERCENT) THAT THE MAJORITY OF THE SAN
JOAQUIN VALLEY WILL BE FLIRTING WITH THE 90'S ON WEDNESDAY. BY
THURSDAY, THE SJV AGAIN HAS MODERATE TO HIGH PROBABILITIES OF
BEING WITHIN THE MID TO UPPER 90'S. THERE IS A LOW POSSIBILITY
(5 TO 15 PERCENT) OF FLIRTING WITH THOSE TRIPLE DIGIT TEMPS
ONCE AGAIN ON THURSDAY AND FRIDAY, PARTICULARLY WITHIN FRESNO,
MADERA AND MERCED COUNTIES. WITH THIS BUILDING HIGH PRESSURE,
THE RELATIVE HUMIDITIES WILL CONTINUE TO STAY LOW (LESS THAN 15
PERCENT) THROUGH FRIDAY.
LOOKING AHEAD INTO NEXT WEEK, AN UPPER LEVEL TROUGH WILL PASS
OVER THE PACIFIC NORTHWEST. TEMPERATURES WITH THIS ARE LOOKING
TO BE IN THE LOW TO MID 90S AT THE WARMEST LOCATIONS.
AVIATION
VFR CONDITIONS WILL PREVAIL FOR THE NEXT 24 HOURS.
FIRE WEATHER
LOW RELATIVE HUMIDITY VALUES CONTINUE THROUGHOUT THE VALLEY THIS
WEEK. MOST AREAS WITHIN THE SJV WILL BE BELOW 15 PERCENT. THE
PREDOMINANT THREATS FOR FIRE WEATHER WILL BE RAPIDLY DEVELOPING
AND SPREADING GRASS FIRES. WINDS WILL BE LIGHTER COMPARED TO THE
WEEKEND. A WARMING AND DRYING TREND WILL MOVE INTO CENTRAL
CALIFORNIA THROUGHOUT FRIDAY. THUS, ELEVATED FIRE WEATHER
THROUGHOUT THE WEEK. THERE WILL BE POOR TO MODERATE OVERNIGHT
HUMIDITY RECOVERY FOR THE LATTER PART OF THE WEEK.
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...BB
AVIATION....BB
WEATHER.GOV/HANFORD
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