838
FXUS66 KSTO 082123
AFDSTO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
223 PM PDT FRI AUG 8 2025
DISCUSSION
SYNOPSIS
A WARMING AND DRYING TREND IS EXPECTED TO CONTINUE WITH
WIDESPREAD MODERATE HEATRISK FRIDAY THROUGH THE WEEKEND.
WIDESPREAD TRIPLE DIGIT HIGHS ARE EXPECTED INTO MONDAY.
TEMPERATURES RETURN TO NEAR TO SLIGHTLY BELOW NORMAL BY MIDWEEK
NEXT WEEK.
KEY MESSAGES
*TODAY-SATURDAY:
- GRADUAL WARMING AND DRYING TREND CONTINUES AS DESERT SOUTHWEST
AND EAST PACIFIC RIDGING AMPLIFIES.
- BREEZY NORTH WINDS RETURN LATE TONIGHT INTO EARLY SATURDAY OVER
PORTIONS OF THE NORTHERN AND CENTRAL SACRAMENTO VALLEY,
PRIMARILY ALONG AND WEST OF I-5.
- WARMING TREND CONTINUES SATURDAY WITH WIDESPREAD MODERATE
HEATRISK AND WIDESPREAD TRIPLE DIGIT HIGH TEMPERATURES IN THE
VALLEY.
- PROBABILITY OF HIGH TEMPERATURES > 100F ON FRIDAY:
--NORTHERN SACRAMENTO VALLEY: 70-95%
--REMAINDER OF THE VALLEY: 35-70%
*SUNDAY-MONDAY:
- TEMPERATURES WARM ABOVE NORMAL THROUGH THE WEEKEND, WITH
ACCOMPANYING MODERATE HEATRISK ACROSS THE VALLEY AND FOOTHILLS.
- PROBABILITY OF HIGH TEMPERATURES > 100F:
--NORTHERN SACRAMENTO VALLEY: 80-100%
--REMAINDER OF THE VALLEY: 50-80%
- ONSHORE FLOW NEAR THE DELTA WILL CONTINUE TO GIVE SOME RELIEF
WITH THE DELTA BREEZE FOR THE DELTA AND SOUTHERN SACRAMENTO
VALLEY, INCLUDING THE SACRAMENTO METRO AREA. AREAS NOT INFLUENCED
BY THE DELTA BREEZE MAY HAVE ELEVATED LOW TEMPERATURES OVER THE
WEEKEND, SO CONTINUE TO PRACTICE HEAT SAFETY THROUGH THE WEEKEND
EVEN AT NIGHT.
- WITH THE HEAT AND LOW HUMIDITY AND PERIODS OF NORTHERLY WINDS,
MINOR ELEVATED FIRE WEATHER CONDITIONS EXIST FOR THE NORTHERN
SACRAMENTO VALLEY THROUGH SUNDAY.
*LATER NEXT WEEK:
- THE EAST PACIFIC RIDGE AXIS ALOFT LOOKS TO SHIFT WESTWARD, WITH
SHORTWAVE TROUGHING FROM WESTERN CANADA.
- THIS WILL BRING GRADUAL COOLING ACROSS INTERIOR NORCAL WITH
SEASONABLE TO BELOW AVERAGE TEMPERATURES AND PERIODICALLY BREEZY
ONSHORE FLOW RETURNING.
CHANGES FROM PREVIOUS FORECAST
- FORECAST OVERNIGHT LOWS HAVE TRENDED A LITTLE HIGHER FOR THIS WEEKEND.
AVIATION
VFR CONDITIONS EXPECTED TO PREVAIL NEXT 24 HOURS ACROSS INTERIOR
NORTHERN CALIFORNIA. SUSTAINED SURFACE WINDS LESS THAN 12 KTS AT
TAF SITES. WEST-SOUTHWEST WIND GUSTS 15-20 KTS THROUGH THE DELTA
00Z-12Z SATURDAY.
STO WATCHES/WARNINGS/ADVISORIES
NONE.
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