655  
FXUS66 KSTO 302035  
AFDSTO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SACRAMENTO CA  
135 PM PDT MON JUN 30 2025  
 
FOR ADDITIONAL DETAILS ON WEATHER AND EXPECTED IMPACTS OVER THE  
NEXT 7 DAYS, PLEASE VISIT WEATHER.GOV/STO/BRIEFING.  
 
   
DISCUSSION  
 
   
SYNOPSIS  
 
LOW CHANCE FOR MOUNTAIN THUNDERSTORMS THROUGH MID-WEEK. LIGHTNING  
ON DRY FUELS MAY LEAD TO EASIER FIRE STARTS. OTHERWISE WARM AND  
DRY WEATHER CONTINUES WITH PERIODICALLY BREEZY ONSHORE WINDS.  
WIDESPREAD MODERATE HEATRISK PERSISTS INTO THE MIDDLE OF NEXT  
WEEK. QUIET AND COOLER END TO THE WEEK.  
 
 
   
KEY MESSAGES  
 
* EARLY TO MID WEEK:  
-ABOVE NORMAL TEMPERATURES PERSIST THROUGH WEDNESDAY WITH  
WIDESPREAD MODERATE HEATRISK, ALTHOUGH INCREASED ONSHORE FLOW  
BRINGS SOME RELIEF TO THE DELTA VICINITY  
-SLIGHT (10-30%) PROBABILITY OF THUNDERSTORMS THROUGH WEDNESDAY  
DURING THE AFTERNOON AND EARLY EVENING HOURS ACROSS THE  
MOUNTAINS OF INTERIOR NORCAL. HIGHEST THUNDERSTORM PROBABILITIES  
OVER THE NORTHERN MOUNTAINS ON MONDAY-TUESDAY. THUNDERSTORM  
CHANCES EXPAND FARTHER SOUTH INTO THE SIERRA BY WEDNESDAY.  
-LIGHTNING ON DRY FUELS MAY LEAD TO EASIER FIRE STARTS. A RED  
FLAG WARNING HAS BEEN ISSUED FOR THE NORTHERN COAST RANGE,  
SHASTA COUNTY MOUNTAINS AND BURNEY BASIN FROM 11 AM - 8 PM  
TUESDAY.  
 
* LATE NEXT WEEK:  
-QUIET WEATHER LATE WEEK WITH TEMPERATURES BECOMING SEASONAL TO  
SLIGHTLY BELOW AVERAGE  
-COOLEST DAY WILL BE FRIDAY  
   
CHANGES FROM PREVIOUS FORECAST  
 
-NO MAJOR CHANGES IN THE FORECAST  
 
 
 
   
AVIATION  
 
VFR CONDITIONS PREVAIL ACROSS INTERIOR NORCAL NEXT 24 HOURS.  
SURFACE WINDS 12 KTS OR LESS, EXCEPT IN THE DELTA VICINITY WHERE  
SOUTHWEST GUSTS 20 TO 25 KTS ARE EXPECTED THROUGH 14Z TUESDAY.  
ISOLATED MOUNTAIN THUNDERSTORMS POSSIBLE ACROSS NORTHERN/CENTRAL  
SACRAMENTO VALLEY AND SURROUNDING TERRAIN THROUGH 10Z TUESDAY.  
 
   
STO WATCHES/WARNINGS/ADVISORIES  
 
RED FLAG WARNING UNTIL 8 PM PDT TUESDAY FOR BURNEY BASIN AND  
NORTHEAST PLATEAU IN SHASTA COUNTY INCLUDING NORTHWEST LASSEN NF  
NORTH OF LASSEN NP-EASTERN MENDOCINO NF-EASTERN PORTION OF  
SHASTA/TRINITY NF-NORTHERN SIERRA FOOTHILLS FROM 1000 TO 3000  
FT. INCLUDES PORTIONS OF SHASTA-TRINITY AND BUTTE UNITS-NORTHERN  
SIERRA INCLUDING LASSEN NP AND PLUMAS AND LASSEN NF/S WEST OF  
THE SIERRA CREST (WEST OF EVANS PEAK-GRIZZLY PEAK-BECKWORTH  
PEAK)-SOUTHEAST EDGE SHASTA-TRINITY NF AND WESTERN PORTIONS OF  
TEHAMA-GLENN UNIT.  
 
 
 
 
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