341
FXUS66 KSTO 160901
AFDSTO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
201 AM PDT WED APR 16 2025
DISCUSSION
SYNOPSIS
AN UPPER-LEVEL LOW PRESSURE SYSTEM IS EXPECTED TO BRING CHANCES
FOR ISOLATED AFTERNOON AND EVENING MOUNTAIN THUNDERSTORMS TODAY
AND TOMORROW, ALONG WITH AN INCREASED DELTA BREEZE. TEMPERATURES
WILL FOLLOW A SLIGHT COOLING TREND, FELT MAINLY THROUGH THE DELTA
AND SOUTHERN SACRAMENTO VALLEY. DRIER AND WARMER CONDITIONS THEN
RESUME FRIDAY AND THROUGH EARLY NEXT WEEK AS WEAK UPPER-LEVEL
RIDGING SETS UP OVER THE AREA.
KEY MESSAGES
* TODAY & THURSDAY:
-OVERALL MORE SEASONABLE TEMPERATURES WITH BREEZY WEST-
SOUTHWEST WINDS THROUGH THE DELTA (20-30 MPH) AND SOUTHERN
SACRAMENTO VALLEY (15-25 MPH).
-ISOLATED TO SCATTERED THUNDERSTORM CHANCES DURING THE AFTERNOON AND
EVENING TODAY THROUGH THURSDAY ACROSS THE MOUNTAINS AND
FOOTHILLS.
- PROBABILITY OF THUNDERSTORMS:
- TODAY: 20-40%, HIGHEST ALONG SIERRA/SOUTHERN CASCADES
- THURSDAY: 10-20%, HIGHEST ALONG SIERRA SOUTH OF HIGHWAY 50
* FRIDAY - TUESDAY:
-ABOVE-NORMAL TEMPERATURES RETURN WITH BREEZY NORTH WINDS ON
FRIDAY (20 TO 30 MPH) THROUGH THE WESTERN PORTION OF THE
SACRAMENTO VALLEY.
-MINOR HEATRISK RETURNS TO THE VALLEY
-PROBABILITY OF HIGH TEMPERATURES 80 DEGREES F OR HIGHER:
- NORTHERN/CENTRAL SACRAMENTO VALLEY: 50 TO 70%
- DELTA, SOUTHERN SACRAMENTO AND NORTHERN SAN JOAQUIN VALLEYS:
40 TO 70%
CHANGES FROM PREVIOUS FORECAST
* NO SIGNIFICANT UPDATES.
AVIATION
VFR CONDITIONS EXPECTED OVER THE NEXT 24 HOURS AT TAF SITE, WITH
WINDS INCREASING TODAY AFTER 20Z TO 12-14 KT WITH GUSTS TO 20 TO
25 KT. THE DELTA WILL SEE WESTERLY GUSTS 15 TO 25 KTS THROUGH 09Z
THURSDAY. THERE IS A 15-25% CHANCE OF ISOLATED MOUNTAIN
THUNDERSTORMS FROM 19Z-03Z THIS AFT/EVE.
STO WATCHES/WARNINGS/ADVISORIES
NONE.
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