464
FXUS66 KMTR 231003
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
303 AM PDT Mon Sep 23 2024

...New SYNOPSIS, SHORT TERM, LONG TERM...

.SYNOPSIS...
Issued at 300 AM PDT Mon Sep 23 2024

Temperatures peak today and tomorrow with a Heat Advisory in effect
for the interior East Bay, South Bay, and the Santa Cruz Mountains
beginning at 11 AM PDT. Temperatures return to near seasonal
averages on Wednesday for the remainder of the extended forecast.

&&

.SHORT TERM...
(Today and tonight)
Issued at 300 AM PDT Mon Sep 23 2024

A Heat Advisory will go into effect later this morning
for the interior East Bay, South Bay and Santa Cruz mountains as
temperatures climb into the 90s to near 100 for many inland
locations. A warm airmass over our area defined by low/mid level
temperatures in the 90th percentile (H50 at -6.5C, H85 at 22C) or
slightly higher will peak today, though linger through tomorrow,
especially over the interior North Bay where a Heat Advisory will
remain in effect for Tuesday afternoon as well. With light winds
from the surface up to around H50, a lack of ventilation will lead
to some haze as well the next couple of days.

&&

.LONG TERM...
(Tuesday through Sunday)
Issued at 300 AM PDT Mon Sep 23 2024

By late Tuesday night into Wednesday, upper level flow, though still
relatively light will regain a westerly component as we begin to
feel the influence of a developing trough over the central
California coast. Cooler temperatures aloft will translate to near
normal surface temperatures for the remainder of the week into next
weekend as the upper low currently in our vicinity, is absorbed by a
broad, deepening trough out of the Gulf of Alaska that will persist
through the remainder of the extended forecast.&&

.AVIATION...
(06Z TAFS)
Issued at 1050 PM PDT Sun Sep 22 2024

Coastal stratus and fog /VLIFR-IFR/ moving locally inland tonight
and Monday morning otherwise it`s VFR.

Vicinity of SFO...VFR except tempo IFR 11z-15z Monday. Northwest
wind 5 to 10 knots becoming northeast near 5 knots Monday morning
then west near 10 knots Monday afternoon.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Stratus and fog /VLIFR-IFR/ tonight and
Monday morning, conditions improving to MVFR-VFR by late Monday
morning. Light and variable winds tonight and Monday morning,
becoming west to northwest 5 to 15 knots in the afternoon and
early evening.

&&

.MARINE...
(Tonight through next Saturday)
Issued at 905 PM PDT Sun Sep 22 2024

The pressure gradient between subtropical high pressure over the
Eastern Pacific Ocean and low pressure over the West Coast will
support strong northwesterly breezes and rough seas in the outer
waters through Monday. Northwesterly breezes decrease and seas
abate beginning Tuesday. Northwesterly breezes increase and seas
rebuild to become rough in the outer waters by Thursday.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory from 11 AM this morning to 8 PM PDT Tuesday for
     CAZ510-515.

     Heat Advisory from 11 AM this morning to 8 PM PDT this evening
     for CAZ512>514.

PZ...Small Craft Advisory until 9 AM PDT this morning for Pt Arena to
     Pt Reyes 10-60 NM.

&&

$$

SHORT TERM...JM
LONG TERM....JM
AVIATION...Canepa
MARINE...Sarment

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