721
FXUS66 KSTO 221920
AFDSTO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
1220 PM PDT WED JUL 22 2026
KEY MESSAGES
- SLIGHT CHANCE FOR A SHOWER OR ISOLATED THUNDERSTORM THIS
AFTERNOON AND EVENING OVER THE SIERRA CREST AND SOUTHERN
CASCADES.
- ELEVATED FIRE WEATHER CONDITIONS FRIDAY AND SATURDAY WITHIN THE
BURNEY BASIN DUE TO LOW RELATIVE HUMIDITY AND BREEZY WESTERLY
WINDS.
DISCUSSION
VISIBLE SATELLITE SHOWS INTERIOR NORTHERN CALIFORNIA CLEAR THIS
AFTERNOON, WITH TEMPERATURES CLIMBING ACROSS THE AREA.
TEMPERATURES REACH INTO THE 90S FOR THE NORTHERN SACRAMENTO
VALLEY AND NORTHERN SAN JOAQUIN VALLEY THIS AFTERNOON AND EVENING.
A DELTA BREEZE DEVELOPS THIS AFTERNOON/EVENING HELPING TO KEEP
TEMPERATURES COOLER IN THE DELTA AND SOUTHERN SACRAMENTO VALLEY,
WITH HIGHS IN THE UPPER 80S TODAY.
MONSOONAL MOISTURE HAS PUSHED FURTHER TOWARD THE EAST TODAY, BUT
ISOLATED THUNDERSTORMS CHANCES REMAIN FOR AREAS EAST OF THE CREST
THIS AFTERNOON AND EVENING. BEST CHANCES REMAIN FURTHER INTO
NEVADA WHERE THE INSTABILITY AXIS, MOISTURE INFLUX, AND SYNOPTIC
FORCING IS HIGHER. NONE THE LESS THERE IS STILL A LESS THAN 10
PERCENT CHANCE FOR AN ISOLATED SHOWER OR STORM ALONG THE CREST AND
IN NORTHERN PORTIONS OF SHASTA COUNTY THIS AFTERNOON AND EVENING.
BREEZY ONSHORE WINDS WILL CONTINUE THROUGH TODAY AND TOMORROW,
WITH GUSTS UP TO 25KTS AT TIMES FOR PARTS OF THE VALLEY.
TEMPERATURES WILL BE SEASONABLE ACROSS THE AREA THROUGH THE END OF
THE WEEK AND INTO THE WEEKEND, WITH THE WARMEST CONDITIONS AROUND
REDDING. AS WE MOVE INTO FRIDAY AND SATURDAY, WINDS INCREASE FOR
PARTS OF THE SOUTHERN CASCADES AND INTO THE BURNEY BASIN, WITH
PERIODIC GUSTS TO 25KTS. CONDITIONS WILL BE DRY ACROSS MUCH OF THE
AREA, AND ESPECIALLY IN THE BURNEY BASIN OVER THE WEEKEND.
ELEVATED FIRE WEATHER CONDITIONS ARE EXPECTED WITHIN THE BURNEY
BASIN FRIDAY INTO SATURDAY DUE TO THE LOW RH VALUES COMBINED WITH
THE BREEZY WESTERLY WINDS. WE WILL KEEP AN EYE ON ANY HIGHER WIND
POTENTIAL FRIDAY AND SATURDAY FOR THE BURNEY BASIN AND IF ANY
ADDITIONAL HEADLINES ARE NEEDED.
OTHERWISE, DRY CONDITIONS ARE EXPECTED FOR THE AREA OVER THE
WEEKEND AND INTO EARLY NEXT WEEK. SYNOPTIC LEVELS SHOW THE RIDGE
OF HIGH PRESSURE BUILDING BACK THROUGH THE WESTERN UNITED STATES
SIGNALING A RETURN TO ABOVE NORMAL TEMPERATURES FOR INTERIOR
NORTHERN CALIFORNIA.
AVIATION
VFR CONDITIONS PREVAIL THROUGH THE TAF PERIOD. SKC TO FEW CLOUDS
THIS AFTERNOON AND EVENING, WITH BREEZY CONDITIONS FOR RDD AND RBL
OUT OF THE SOUTH. GUSTS UP TO 20KTS WILL BE POSSIBLE THIS
AFTERNOON AND EVENING. BREEZY CONDITIONS AS WELL FOR THE OTHER TAF
LOCATIONS, WITH GUSTS UP TO 20KTS. FEW TO SCT CLOUDS MOVE IN NEAR
10-14Z FOR THE SACRAMENTO SITES THROUGH MOD AND SCK.
STO WATCHES/WARNINGS/ADVISORIES
NONE.
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