581  
FXUS66 KHNX 211234  
AFDHNX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA  
434 AM PST THU FEB 21 2019  
   
SYNOPSIS
 
 
A COLD STORM SYSTEM WITH LIMITED MOISTURE WILL MOVE OUT OF THE  
REGION TODAY AFTER DROPPING SOME ACCUMULATIONS OF SNOW AS LOW AS  
2000 FEET. TEMPERATURES WILL REMAIN BELOW NORMAL FOR THIS TIME OF  
YEAR THROUGH THE END OF THE WEEK BEHIND THE COLD SYSTEM. ANOTHER  
WEAKER SYSTEM WILL BRUSH BY MAINLY TO OUR NORTH EARLY NEXT WEEK.  
 

 
   
DISCUSSION
 
 
A COLD LOW PRESSURE SYSTEM IS CURRENTLY DROPPING THROUGH THE GREAT  
BASIN AREA WITH STRONG UPPER LEVEL JET ENERGY DIVING SOUTH ALONG  
THE CA COAST. WITH LIMITED MOISTURE AVAILABLE, WE'VE BEEN SEEING  
MAINLY LIGHT TO MODERATE PRECIP SCATTERED OVER OUR AREA. BUT  
DYNAMICS ARE SUFFICIENT TO FIRE UP SOME HEAVIER SHOWERS WITH SMALL  
HAIL AND AN OCCASIONAL LIGHTNING STRIKE. AN AREA OF HEAVIER PRECIP  
IS CURRENTLY SLIDING SOUTH ACROSS THE CENTRAL PORTION OF THE SJ  
VALLEY. LIGHT TO MODERATE SNOWFALL IN THE KERN COUNTY MOUNTAINS  
WILL INTENSIFY AS THIS AREA MOVES THROUGH THERE THIS MORNING. A  
WINTER WEATHER ADVISORY REMAINS IN EFFECT FOR THE MOUNTAINS OF  
KERN COUNTY DOWN TO 2000 FT, AS THIS ACCUMULATING SNOW WILL CAUSE  
HAZARDOUS OR IMPOSSIBLE TRAVEL CONDITIONS TODAY.  
 
THE LOW PRESSURE SYSTEM IS PROGGED TO PULL EAST TODAY AND  
PRECIPITATION WILL WIND DOWN, WITH JUST SOME LINGERING MOUNTAIN  
SHOWERS LATER THIS AFTERNOON. AS SKIES CLEAR OUT, COLD AIR IN THE  
WAKE OF THE STORM WILL ALLOW LOW TEMPERATURES TO DROP BELOW  
FREEZING LATE TONIGHT INTO FRIDAY MORNING IN THE SJ VALLEY AND A  
FREEZE WARNING HAS BEEN ISSUED.  
 
DRY AND SLIGHTLY WARMER CONDITIONS THEN ARE IN STORE THROUGH THE  
END OF THE WEEK UNDER SLIGHT RIDGING, WITH TEMPERATURES RETURNING  
TO NEAR CLIMO. SOME GUIDANCE HAS BEEN INDICATING A RETURN OF  
PRECIPITATION CHANCES FOR THE FIRST PART OF NEXT WEEK, BUT THERE  
IS LITTLE CERTAINTY IN PRECIPITATION CHANCES FOR SUNDAY AND  
MONDAY AS MODEL TRENDS ARE CURRENTLY SKIRTING MOISTURE AND ENERGY  
MAINLY TO OUR NORTH.  
 
ADDITIONAL RIDGING IS PROGGED FOR THE MIDDLE OF NEXT WEEK AHEAD OF  
ANOTHER DEVELOPING SYSTEM, WITH TEMPERATURES RUNNING AT OR  
SLIGHTLY ABOVE NORMAL.  
 

 
   
AVIATION
 
 
AREAS OF MOUNTAIN OBSCURATIONS IN LOW CLOUDS AND PRECIPITATION IN  
THE SIERRA NEVADA, FOOTHILLS, AND KERN COUNTY MOUNTAINS THROUGH  
THIS AFTERNOON. MVFR AND LOCAL IFR CONDITIONS IN LOW CLOUDS AND  
SHOWERS ACROSS THE SAN JOAQUIN VALLEY ARE EXPECTED DURING THIS  
MORNING. OTHERWISE, VFR CONDITIONS CAN BE EXPECTED ACROSS THE  
CENTRAL CA 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  
AN/OR TO PROVIDE FEEDBACK.  
 

 
   
HNX WATCHES/WARNINGS/ADVISORIES
 
 
WINTER WEATHER ADVISORY UNTIL 4 PM PST THIS AFTERNOON ABOVE 2000  
FEET FOR THE CAZ095.  
 
FREEZE WARNING FROM 10 PM THIS EVENING TO 9 AM PST FRIDAY  
CAZ089>092.  
 

 
 

 
 
PUBLIC...JEB  
AVN/FW...ANDERSEN  
SYNOPSIS...JEB  
 
WEATHER.GOV/HANFORD  
 
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