126
FXUS66 KSTO 012027
AFDSTO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
127 PM PDT TUE JUL 1 2025
FOR ADDITIONAL DETAILS ON WEATHER AND EXPECTED IMPACTS OVER THE
NEXT 7 DAYS, PLEASE VISIT WEATHER.GOV/STO/BRIEFING.
DISCUSSION
SYNOPSIS
20-30% 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 THROUGH WEDNESDAY.
QUIET AND COOLER FOR THE END TO THE WEEK INTO THE WEEKEND.
KEY MESSAGES
* THROUGH 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 TUESDAY DURING
THE AFTERNOON AND EARLY EVENING HOURS ACROSS THE MOUNTAINS OF
INTERIOR NORCAL. HIGHEST THUNDERSTORM PROBABILITIES OVER THE
NORTHERN MOUNTAINS AND COASTAL RANGE.
- LOW (20%) CHANCE FOR SHOWERS AND THUNDERSTORMS OVER THE
NORTHERN SACRAMENTO VALLEY LATE TUESDAY EVENING
- THUNDERSTORM CHANCES SHIFT WEDNESDAY TO NEAR THE SIERRA CREST
AND WEST
- 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 UNTIL 8 PM TUESDAY.
* LATE NEXT WEEK:
- QUIET WEATHER LATE WEEK INTO THE WEEKENDED
- ONSHORE WINDS WILL COOL TEMPERATURES TO SEASONAL NORMS TO
SLIGHTLY BELOW AVERAGE
- COOLEST DAY WILL BE FRIDAY
- SLIGHT WARMING OVER THE WEEKEND INTO NEXT WEEK
CHANGES FROM PREVIOUS FORECAST
- ADDED LOW, UP TO 20% CHANCE FOR SHOWERS AND THUNDERSTORMS OVER
THE NORTHERN SACRAMENTO VALLEY LATE THIS EVENING
AVIATION
VFR CONDITIONS EXPECTED TO PREVAIL ACROSS INTERIOR NORCAL NEXT 24
HOURS, ALTHOUGH SOME POTENTIAL FOR BRIEF MVFR/IFR IN ISOLATED
SH/TS AT RDD AND RBL THROUGH 06Z. SURFACE WINDS 12 KTS OR LESS,
EXCEPT IN THE DELTA VICINITY WHERE SOUTHWEST GUSTS 20 TO 25 KTS
ARE EXPECTED THROUGH 14Z TUESDAY. OTHERWISE MOUNTAIN THUNDERSTORMS
POSSIBLE ACROSS COAST RANGE AND SOUTHERN CASCADES THROUGH 10Z
TUESDAY.
STO WATCHES/WARNINGS/ADVISORIES
RED FLAG WARNING UNTIL 8 PM PDT THIS EVENING 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.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page