436
FXUS66 KSTO 150930
AFDSTO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
230 AM PDT TUE APR 15 2025
DISCUSSION
SYNOPSIS
A CUTOFF LOW APPROACHES THE CENTRAL CALIFORNIA COAST THROUGH
WEDNESDAY BEFORE MOVING INLAND THURSDAY, BRINGING PM SHOWERS AND
THUNDERSTORMS CHANCES FOR THE MOUNTAINS/UPPER FOOTHILLS EACH DAY.
ELSEWHERE DRY WEATHER CONTINUES THROUGH THE WEEK AND INTO EARLY NEXT
WEEK. COOLER BUT STILL ABOVE NORMAL TEMPERATURES ARE EXPECTED
TODAY, TRENDING DOWN AND BECOMING MORE SEASONABLE MID-WEEK BEFORE
WARMING AGAIN FOR THE WEEKEND.
KEY MESSAGES
* TODAY:
-ABOVE-NORMAL TEMPERATURES AND MINOR HEATRISK TODAY FOR THE
SACRAMENTO VALLEY.
-PROBABILITY OF HIGH TEMPERATURES 80 DEGREES F OR HIGHER:
- NORTHERN/CENTRAL SACRAMENTO VALLEY:
60 TO 100%
- DELTA, SOUTHERN SACRAMENTO AND NORTHERN SAN JOAQUIN VALLEYS:
10 TO 40%
* TODAY - SATURDAY:
-CONTINUED WARM WEATHER TODAY BECOMES SEASONABLE THROUGH MID
WEEK, WITH AN ADDITIONAL WARMING TREND MOVING INTO THE WEEKEND.
-ISOLATED TO SCATTERED THUNDERSTORM CHANCES DURING THE AFTERNOON
AND EVENING TODAY THROUGH THURSDAY ACROSS THE MOUNTAINS AND
FOOTHILLS.
-PROBABILITY OF THUNDERSTORM DEVELOPMENT:
-TODAY: 10-20%, HIGHEST ALONG SIERRA FROM INTERSTATE 80
SOUTHWARD
-WEDNESDAY: 20-30%, HIGHEST ALONG SIERRA/SOUTHERN CASCADES
-THURSDAY: 5-15%, HIGHEST ALONG SIERRA SOUTH OF HIGHWAY 50
-PROBABILITY SNOWFALL >1":
-THURSDAY NIGHT-FRIDAY MORNING: 10-30% SIERRA LOCATIONS ABOVE
6500 FEET SOUTH OF INTERSTATE 80
-PROBABILITY OF NORTHERLY WIND GUSTS > 30 MPH:
-FRIDAY: 40-80%, HIGHEST ALONG AND WEST OF THE INTERSTATE
5 CORRIDOR
-PROBABILITY OF NORTHERLY WIND GUSTS WEST OF INTERSTATE 5> 40 MPH:
-FRIDAY: 25-60%, HIGHEST FAR WESTERN SACRAMENTO VALLEY
-A RETURN TO SLIGHTLY ABOVE NORMAL TEMPERATURES EXPECTED THIS
WEEKEND
CHANGES FROM PREVIOUS FORECAST
* SLIGHTLY LOWER POTENTIAL FOR PM SHOWERS/THUNDERSTORMS, WITH
CHANCES MAINLY FOCUSED OVER SIERRA AND SOUTHERN CASCADES AND
ADJACENT UPPER FOOTHILLS
* WIND GUST PROBABILITIES FRIDAY INCREASED SLIGHTLY
AVIATION
VFR CONDITIONS EXPECTED OVER THE NEXT 24 HOURS AT TAF SITES WITH
WINDS GENERALLY LIGHT AND LESS THAN 12 KTS. EXCEPT IN AND AROUND
THE DELTA WITH WESTERLY GUSTS 15 TO 25 KTS THROUGH 18Z WEDNESDAY.
ADDITIONALLY, THERE IS A 10-20% CHANCE OF ISOLATED MOUNTAIN
THUNDERSTORMS THIS AFTERNOON MAINLY OVER THE SIERRA (19Z-03Z
WEDNESDAY).
STO WATCHES/WARNINGS/ADVISORIES
NONE.
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