930
FXUS66 KSTO 081809
AFDSTO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
1109 AM PDT MON JUN 8 2026
FOR ADDITIONAL DETAILS ON WEATHER AND EXPECTED IMPACTS OVER THE
NEXT 7 DAYS, PLEASE VISIT WEATHER.GOV/STO/BRIEFING.
KEY MESSAGES
-COOLER TEMPERATURES WITH BREEZY ONSHORE WINDS THROUGH TUESDAY.
-CRITICAL FIRE WEATHER CONDITIONS IN THE SACRAMENTO VALLEY
WEDNESDAY - THURSDAY DUE TO GUSTY NORTH WINDS AND LOW HUMIDITY.
-SIGNIFICANT WARM UP STARTING MID-WEEK BRINGS TRIPLE DIGITS IN
THE LOWER ELEVATIONS WITH MODERATE TO MAJOR HEATRISK INTO THE
WEEKEND.
DISCUSSION
..TODAY INTO TUESDAY
AN UPPER LEVEL TROUGH MOVING THROUGH THE PACNW WILL CONTINUE TO
BRING AREA OF CLOUDS AND A FEW LIGHT RADAR RETURNS ACROSS THE
AREA. NOTHING MEASURABLE SO FAR IN THE AREA AND THIS WILL LIKELY
CONTINUE TO MAINLY BE THE CASE AS THE SYSTEM SKIRTS THE AREA TO
THE NORTH. A FEW LIGHT ACCUMULATIONS POSSIBLE ACROSS NORTHERN
MOUNTAINS BUT OTHERWISE ONLY TANGIBLE AFFECT WILL BE INCREASING
ONSHORE FLOW AND SOME CLOUDS WITH COOLER TEMPS.
..WEDNESDAY THROUGH SUNDAY
AS EARLY-WEEK TROUGH SHIFTS INTO THE GREAT BASIN, WE'LL SEE WINDS
SHIFT OUT OF THE NORTH AND INCREASE ON WEDNESDAY INTO THURSDAY.
AS NORTH WINDS INCREASE, CONDITIONS WILL DRY OUT WITH DAYTIME RELATIVE
HUMIDITY DROPPING INTO THE SINGLE DIGITS TO TEENS ACROSS THE
SACRAMENTO VALLEY WITH LIMITED OVERNIGHT RECOVERY. ENSEMBLE
GUIDANCE AND EFI IN GOOD AGREEMENT WITH HIGHEST THREAT ACROSS THE
TYPICAL WESTERN SIDE OF THE SAC VALLEY. WITH INCREASING
CONFIDENCE IN CRITICAL FIRE WEATHER CONDITIONS, WE'VE UPGRADED
THE CURRENT FIRE WEATHER WATCH TO A RED FLAG WARNING. WE DID TRIM
OFF THE SOUTHERN END (DELTA TO SAC METRO) AS IT LOOKS LIKE LIMITED
DURATION OF RED FLAG LEVEL WINDS.
IN TANDEM WITH CRITICAL FIRE WEATHER CONDITIONS, TEMPERATURES WILL
BEGIN TO HEAT UP AS STRONG UPPER LEVEL RIDING BUILDS ALONG THE
WEST COAST. BY THURSDAY, WIDESPREAD TRIPLE DIGITS ARE EXPECTED IN
THE VALLEY WITH MUCH ABOVE NORMAL TEMPERATURES ACROSS HIGHER
ELEVATIONS. WIDESPREAD MODERATE TO LOCALLY MAJOR HEATRISK WILL
BRING ABOUT THE POTENTIAL NEED FOR HEAT HEADLINES AS WE GO FURTHER
INTO THE WEEK. TEMPERATURES WILL LIKELY REMAIN IN THE TRIPLE
DIGITS THROUGH ABOUT SATURDAY BEFORE SLIGHT COOLING FOR THE END OF
THE WEEKEND AS RIDGING GRADUALLY FLATTENS.
AVIATION
VFR CONDITIONS NEXT 24 HOURS. WESTERLY WINDS WITH GUSTS 15 TO 25
KTS THROUGH 05-06Z TONIGHT INVOF DELTA, SOUTHERN SAC AND NORTHERN
SAN JOAQUIN VALLEYS. LIGHTER WINDS EXPECTED ON TUESDAY WITH
CLEARING SKIES.
STO WATCHES/WARNINGS/ADVISORIES
RED FLAG WARNING FROM 11 AM WEDNESDAY TO 5 PM PDT THURSDAY FOR
BUTTE COUNTY BELOW 1000 FT-C. YOLO/NE SOLANO INCLUDING WOODLAND-
CENTRAL COLUSA COUNTY INCL. I-5-CENTRAL GLENN CO & INTERSTATE 5-
EASTERN COLUSA COUNTY-EASTERN GLENN COUNTY-N. SAC VALLEY IN
TEHAMA COUNTY-SHASTA METRO-SUTTER/YUBA COUNTIES BELOW 1000 FT-W.
YOLO COUNTY INCLUDING CAPAY/I-505.
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