157  
FXUS66 KHNX 010922  
AFDHNX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE HANFORD CA  
222 AM PDT THU JUN 1 2023  
 
   
SYNOPSIS  
 
THE WARMING TREND CONTINUES TODAY, WITH THE SAN JOAQUIN VALLEY  
SEEING HIGH TEMPERATURES IN THE LOW TO MID 80'S. THE PEAK OF THE  
WARMING TREND WILL BE SUNDAY, WITH HIGHS IN THE HIGH 90'S. THESE  
SUNDAY HIGHS WILL BE AROUND 6 TO 9 DEGREES ABOVE NORMAL FOR THIS  
TIME OF YEAR. TEMPERATURES WILL START TO COOL SLIGHTLY ON MONDAY  
AND HIGHS WILL BE AROUND SEASONAL NORMS BY TUESDAY AND INTO  
THURSDAY. THE SIERRA NEVADA WILL CONTINUE TO SEE CHANCES FOR  
THUNDERSTORMS EVERY AFTERNOON FOR THE NEXT WEEK.  
 
 
   
DISCUSSION  
 
WITH THE WEAK DISTURBANCE MOVING OFF TO THE EAST, RIDGE BUILDING  
WILL CONTINUE UNTIL SUNDAY, CAUSING THE HIGH TEMPERATURE TO RISE  
WITH IT. HIGHS IN THE VALLEY TODAY WILL BE AROUND THE AVERAGE OF  
THIS TIME OF YEAR, WHILE HIGHS ON SUNDAY WILL BE AROUND 6 TO 9  
DEGREES ABOVE NORMAL. SOME PLACES MAY SEE 100 DEGREES OR ABOVE,  
WITH NBM PROBABILITIES SHOWING FRESNO HAS A 21% CHANCE AND HANFORD  
HAVING AN 11% CHANCE.  
 
AN UPPER LEVEL TROUGH WILL BEGIN TO DEVELOP AND MOVE INTO OUR AREA  
ON MONDAY, WHICH WILL START TO LOWER TEMPERATURES. BY TUESDAY,  
HIGHS IN THE VALLEY WILL BE AROUND NORMAL FOR THIS TIME OF YEAR,  
IN THE HIGH 80'S. THESE TEMPERATURES ARE EXPECTED TO REMAIN  
CONSISTENT THROUGH NEXT THURSDAY. A LOW PRESSURE SYSTEM  
ASSOICATED WITH THIS TROUGH WILL CONTINUE TO SPIN OVER CALIFORNIA  
AND BRING CHANCES FOR RAIN TO THE EASTERN VALLEY, THE SIERRA  
NEVADA MOUNTAINS AND FOOTHILLS, AS WELL AS THE KERN COUNTY  
MOUNTAINS AND HIGH DESERT ON TUESDAY.  
 
CHANCES FOR THUNDERSTORMS IN THE SIERRA NEVADA WILL CONTINUE  
EVERYDAY IN THE AFTERNOON THROUGH THE NEXT WEEK. THESE CHANCES  
INCREASE MONDAY THROUGH WEDNESDAY AS THE LOW PRESSURE SYSTEM MOVES  
THROUGH AND COULD EXTEND FROM YOSEMITE VALLEY TO THE SOUTHERNMOST  
POINT OF THE RANGE IN KERN COUNTY. THESE STORMS MAY PRODUCE HEAVY  
RAIN AT TIMES, THOUGH THIS WILL BE RARE DUE TO THE LACK OF A  
SIGNIFICANT MOISTURE POOL. LIGHTNING AND PEA-SIZED HAIL IS STILL A  
POSSIBLE HAZARD, SO BE CAUTIOUS AROUND THESE STORMS.  
 
THIS WARMING TREND WILL INCREASE RUNOFF FROM SNOWMELT AND CAUSE  
RIVERS AND STREAMS TO RUN HIGHER. THIS COULD LEAD TO FLOODING IN  
SOME PLACES. THESE RIVERS ARE CONTINUING TO RUN HIGH AND SWIFT, AS  
WELL AS BEING COLD. RIVERS HAVE BEEN CLOSED BY THE COUNTIES, SO  
ATTEMPTING TO COOL OFF THIS WEEKEND IS NOT ADVISED.  
 
 
 
   
AVIATION  
 
VFR CONDITIONS WILL PREVAIL AT ALL OF THE TERMINAL AERODROME SITES  
THROUGH AT LEAST THE NEXT 24 HOURS. MVFR OR LOWER CONDITIONS ARE  
LIKELY IN AND NEAR ANY THUNDERSTORM IN THE MOUNTAIN AREAS THIS  
AFTERNOON INTO THIS EVENING.  
 
 
   
AIR QUALITY ISSUES  
 
ISSUED: 05/31/2023 15:30  
EXPIRES: 06/01/2023 23:59  
NONE.  
 
 
   
CERTAINTY  
 
THE LEVEL OF CERTAINTY FOR DAYS 1 AND 2 IS MEDIUM.  
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...EW  
AVIATION....EW  
 
WEATHER.GOV/HANFORD  
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