991
FXUS66 KSTO 102017
AFDSTO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
117 PM PDT SAT MAY 10 2025
FOR ADDITIONAL DETAILS ON WEATHER AND EXPECTED IMPACTS OVER THE
NEXT 7 DAYS, PLEASE VISIT WEATHER.GOV/STO/BRIEFING.
DISCUSSION
SYNOPSIS
DRY AND SEASONABLY WARM WEATHER CONTINUES INTO THE WEEKEND. GUSTY
SOUTHERLY WINDS WILL BRING ELEVATED FIRE WEATHER CONDITIONS
ACROSS PORTIONS OF THE VALLEY ON SUNDAY. CHANCES FOR LIGHT
RAIN/MOUNTAIN SNOW SHOWERS AND ISOLATED THUNDERSTORMS ACROSS
INTERIOR NORCAL MONDAY AND TUESDAY. A PATTERN CHANGE TO COOLER
AND UNSETTLED WEATHER IS EXPECTED MOVING INTO EARLY NEXT WEEK.
KEY MESSAGES
* TODAY:
-PERIODIC LATE DAY BREEZY ONSHORE WINDS.
-DRY AND WARM WEATHER WITH TEMPERATURES 10-15 DEGREES ABOVE
NORMAL UNDER UPPER LEVEL RIDGING.
-PROBABILITY OF HIGH TEMPERATURES 90 DEGREES F OR HIGHER: 60-100%
THROUGHOUT THE VALLEY.
* SUNDAY - TUESDAY:
-A TREND TOWARD COOLER AND MORE UNSETTLED WEATHER IS EXPECTED,
WITH A WEATHER SYSTEM ARRIVING SUNDAY INTO EARLY NEXT WEEK.
-GUSTY SOUTHERLY WINDS SUNDAY, REMAINING BREEZY MONDAY AND
TUESDAY. PROBABILITY OF GUSTS 40 MPH OR HIGHER: 50-90% NORTHERN
AND CENTRAL SACRAMENTO VALLEY, AND NORTHEAST FOOTHILLS ON
SUNDAY. STRONGEST WINDS ALONG AND EAST OF I-5, MAINLY FROM CHICO
NORTHWARD. WIND ADVISORY IS IN EFFECT FROM 2 PM SUNDAY THROUGH 1
AM MONDAY FOR THE NORTHEAST FOOTHILLS AND THE NORTHERN/CENTRAL
SACRAMENTO VALLEY.
-ELEVATED FIRE WEATHER CONDITIONS SUNDAY AS GUSTY WINDS AND LOW
RH OVERLAP, PARTICULARLY ACROSS THE NORTHERN/CENTRAL SACRAMENTO
VALLEY.
-LIGHT RAIN AND MOUNTAIN SNOW SHOWERS EXPECTED AS THE SYSTEM
MOVES THROUGH.
-48-HOUR PROBABILITY OF RAIN > 0.25": 50-80% ACROSS NORTHERN
SACRAMENTO VALLEY, NORTHERN SIERRA NORTH OF HWY 50, AND
ADJACENT FOOTHILLS.
-ISOLATED THUNDERSTORM PROBABILITY: 10-30% MONDAY AND TUESDAY,
HIGHEST ACROSS NORTH/CENTRAL SACRAMENTO VALLEY AND ALONG HIGHER
TERRAIN.
-48-HOUR PROBABILITY OF SNOWFALL > 2": 10-40% ALONG
SIERRA/SOUTHERN CASCADES ABOVE 5500 FEET, HIGHEST CHANCES NORTH
OF I-80.
* MID TO LATE NEXT WEEK:
-GENERALLY DRY WEATHER, WITH TEMPERATURES WARMING TO NEAR NORMAL.
CHANGES FROM PREVIOUS FORECAST
-WIND ADVISORY ISSUED FOR THE NORTHERN/CENTRAL SACRAMENTO VALLEY
AND NORTHEAST FOOTHILLS FROM 2 PM SUNDAY TO 1 AM MONDAY.
AVIATION
VFR CONDITIONS ACROSS ALL TAF SITES NEXT 24 HOURS. WIND SPEEDS
GENERALLY 12 KTS OR LESS IN THE VALLEY AND 15-20 KTS OR LESS IN
THE DELTA AND SIERRA NEVADA THROUGH 12Z SUNDAY. GUSTY SOUTHERLY
WINDS THEN DEVELOP AFTER 12Z WITH SPEEDS OF 15-25 KTS IN THE LOWER
ELEVATIONS WITH GUSTS 20-40 KTS, AND 30-50 KTS GUSTS OVER THE
SIERRA OUT OF THE SOUTHWEST.
STO WATCHES/WARNINGS/ADVISORIES
WIND ADVISORY FROM 2 PM SUNDAY TO 1 AM PDT MONDAY FOR CENTRAL
SACRAMENTO VALLEY-NORTHEAST FOOTHILLS/SACRAMENTO VALLEY-NORTHERN
SACRAMENTO VALLEY.
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