-- Discussion containing changed information from previous version are highlighted. --
226
FXUS66 KMTR 301133
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
433 AM PDT Thu May 30 2024

...New AVIATION...

.SYNOPSIS...
Issued at 306 AM PDT Thu May 30 2024

Warm and quiet into the weekend. Slight reprieve in the warming
trend this weekend before a more pronounced warm up and moderate
Heat Risk by the middle of next week.

&&

.SHORT TERM...
(Today and tonight)
Issued at 306 AM PDT Thu May 30 2024

Forecast highs today overall look to be about 3-5 degrees warmer
than yesterday for locations away from the coast. Looking at the
mid-to-upper 80s inland, upper 70s to lower 80s for the Bay
Shoreline, and a spread in the 60s along the coast. Very pleasant
day in store today with mostly clear skies and light winds. It`s
a slim chance with decreasing moisture aloft, but some locations
across the Bay Area and North Bay have a small chance to be
treated to a fantastic sunset with some high clouds overhead.
Skies clear out once again tonight as stratus returns along the
coast.

&&

.LONG TERM...
(Friday through Wednesday)
Issued at 306 AM PDT Thu May 30 2024

Much of the same Friday with temps largely unchanged. Slight
cooldown into Saturday where we`ll shave off 3-5 degrees and bring
temps right around seasonal normals for the rest of the weekend.
We may be facing another round of light drizzle across coastal and
high elevation locations Saturday morning as a weak trough deepens
the marine layer. This also means that we`ll see increase
overnight and morning cloudiness for areas that typically see
marine stratus. This pattern stays largely in place until about
Tuesday when we see a robust ridge begin to build over the western
half of the US. Medium range ensemble guidance is on board with
this pattern with high confidence. ECMWF Extreme Forecast Index
now highlights the midweek period next week for temps well above
average, further strengthening confidence in the need to message
early for heat-related issues. Currently thinking the Tuesday-
Thursday time frame will be the most impactful with moderate Heat
Risk across areas outside the daytime marine influence. In terms
of what temperatures will look like, current best forecast is in
the realm of 8-15 degrees above seasonal normals, with Wednesday
being the warmest. Details remain to be ironed out, but looking at
the long range guidance, it seems this may be our first larger
scale prolonged hot period across the west.

&&

.AVIATION...
-- Changed Discussion --
(12Z TAFS)
Issued at 433 AM PDT Thu May 30 2024

VFR through much of the TAF period, though stratus will begin to
make a resurgence out of the south in the early morning of Friday,
bringing low clouds to terminals nearest to the coast. Monterey Bay
is likely to be the one exception, with IFR CIGs forming early
Friday. Otherwise, winds onshore and breezy this afternoon, then
easing into the nighttime to become light.

Vicinity of SFO...VFR through the TAF period. Not expecting
approaching stratus Friday morning to impact the terminal, though
this will be something to keep an eye on in future updates.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...IFR conditions have developed around the
terminal this morning as a result of a patch of isolated stratus.
VFR conditions are expected to return after sunrise as stratus
begins to mix out. Onshore and breezy winds return in the afternoon,
later becoming light. In the early morning of Friday, stratus is
likely to bring IFR CIGs as low clouds push inland.
-- End Changed Discussion --

&&

.MARINE...
(Today through Tuesday)
Issued at 306 AM PDT Thu May 30 2024

Gale force gusts across the outer waters and inner northern
waters continue through the morning today, but gradually
diminish. Significant wave heights offshore build to 12 feet
tonight with but abating towards Friday and into the weekend.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 3 AM PDT Friday for Pt Arena to Pt
     Reyes 0-10 nm.

     Small Craft Advisory until 9 AM PDT this morning for Pt Reyes to
     Pigeon Pt 0-10 nm.

     Gale Warning until 9 AM PDT this morning for Pigeon Pt to Pt
     Pinos 10-60 NM-Pt Arena to Pt Reyes 10-60 NM.

&&

$$

SHORT TERM...Behringer
LONG TERM....Behringer
AVIATION...AC
MARINE...AC

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