Beach Hazards Statement 6, NWS San Francisco Bay Area, CA

520 
WHUS46 KMTR 162134
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco CA
234 PM PDT Thu Apr 16 2020

...Increasing risk of sneaker waves and strong rip currents from
Coastal Sonoma County to Coastal Monterey County on Friday...

.A long period west swell will impact the coastline Friday 
morning to Friday evening. Energetic swell periods of 17 to 20 
seconds will result in an increased risk of sneaker waves and rip 
currents along the Pacific coastline. The ocean may seem 
relatively calm for periods of times with infrequent larger waves 
capable of knocking unsuspecting people into the ocean. Please 
check with your local authorities on potential beach closures.

CAZ006-505-509-529-530-171000-
/O.CON.KMTR.BH.S.0006.200417T1800Z-200418T0600Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-Northern Monterey Bay-
Southern Monterey Bay and Big Sur Coast-
234 PM PDT Thu Apr 16 2020

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM FRIDAY MORNING
THROUGH FRIDAY EVENING...

* WHAT...Increased risk of sneaker waves and stronger than usual
  rip currents are expected.

* WHERE...Coastal North Bay Including Point Reyes National 
  Seashore, Southern Monterey Bay and Big Sur Coast, San 
  Francisco Peninsula Coast, San Francisco and Northern Monterey 
  Bay Counties.

* WHEN...From Friday morning through Friday evening.

* IMPACTS...Sneaker waves can knock unsuspecting beach goers 
  over and into the sea. Rip currents can pull swimmers and 
  surfers out to sea.

* ADDITIONAL DETAILS...Please check with your local authorities on
  potential beach closures. Steep beaches will have a higher risk
  of sneaker wave and rip current activity with greater wave run-
  up onto beaches. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid hazardous swimming conditions.

&&

$$

367 
WHUS46 KMTR 170916
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco CA
216 AM PDT Fri Apr 17 2020

...Increasing risk of sneaker waves and strong rip currents from
Coastal Sonoma County to Coastal Monterey County today...

.A long period west swell will impact the coastline this morning 
through late this evening. Energetic swell periods of 17 to 20 
seconds will result in an increased risk of sneaker waves and rip 
currents along the Pacific coastline. The ocean may seem 
relatively calm for periods of times with infrequent larger waves 
capable of knocking unsuspecting people into the ocean. Please 
check with your local authorities on potential beach closures.

CAZ006-505-509-529-530-180600-
/O.CON.KMTR.BH.S.0006.200417T1800Z-200418T0600Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-Northern Monterey Bay-
Southern Monterey Bay and Big Sur Coast-
216 AM PDT Fri Apr 17 2020

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM 11 AM PDT THIS
MORNING THROUGH THIS EVENING...

* WHAT...Increased risk of sneaker waves and stronger than usual 
  rip currents are expected. 

* WHERE...Coastal North Bay Including Point Reyes National 
  Seashore, Southern Monterey Bay and Big Sur Coast, San 
  Francisco Peninsula Coast, San Francisco and Northern Monterey 
  Bay Counties. 

* WHEN...From 11AM Friday morning through 11PM Friday evening.

* IMPACTS...Sneaker waves can knock unsuspecting beach goers 
  over and into the sea. Rip currents can pull swimmers and 
  surfers out to sea. 

* ADDITIONAL DETAILS...Please check with your local authorities 
  on potential beach closures. Steep beaches will have a higher 
  risk of sneaker wave and rip current activity with greater 
  wave run- up onto beaches. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid hazardous swimming conditions.

&&

$$

Area Forecast Discussion
National Weather Service San Francisco Bay Area
1039 PM PDT Wed Apr 15 2020

.SYNOPSIS...Cooler temperatures are forecast for the remainder of
the week and into the weekend. While a few isolated showers are
possible from late Thursday through late Friday, mostly dry
conditions will likely prevail through the weekend. Shower chances
will increase late Sunday night into Monday.

&&

.DISCUSSION...As of 9:00 PM PDT Wednesday...Light offshore flow
ended today, allowing a seabreeze to develop by mid afternoon. As
a result, cooler temperatures were observed in most coastal areas,
and also in the North Bay Valleys. Most inland areas from the
East Bay southward remained isolated from the marine air today and
were as warm as yesterday, and in some cases a few degrees
warmer.

The return of onshore flow has allowed low clouds to redevelop
along the coast and we can expect low clouds and patchy fog to
spread into the valleys and around SF Bay overnight and into
Thursday morning. More widespread night and morning low clouds
are likely on Thursday night and Friday morning.

Early evening satellite imagery shows a cyclonic circulation west
of the CA/OR border associated with an upper low. Models agree
that this low will drop south offshore over the next 24 hours and
then turn east and move inland across southern California late in
the week. Models also agree that this system will not generate
precipitation through at least Thursday, and instead only bring
our region mid and high level clouds, along with widespread cooler
temperatures. Isolated showers may develop by late Thursday night
or Friday as the low approaches the coast to our south and moves
inland. The highest potential for isolated showers will be across
San Benito County, inland Monterey County, and eastern Santa Clara
County. But even in these areas, measurable rain chances are
currently less than 20 percent from Thursday night through Friday
evening.

A brief period of shortwave ridging over the weekend should keep
our area dry on Saturday and Sunday. Rain chances will then return
by late Sunday night and Monday as a somewhat strong system
moves in from the west. Rain chances with the system early next
week are highest across the southern half of our area. Longer
range models indicate warmer and drier conditions by Tuesday and
Wednesday of next week.

&&

.AVIATION...As of 10:39 PM PDT Wednesday...It's VFR except IFR
along the coast with a marine layer, stratus and fog moving inland
overnight. The SFO-SAC pressure gradient is 2.0 mb. A weakening
of the marine temperature inversion coincides with the development
of a weak surface to 850 mb cyclonic circulation centering over
the Bay Area tonight and Thursday morning; it's a much smaller
scale circulation initially separate from the incoming low to the
northwest. Patchy light drizzle is possible tonight and Thursday
morning. Increasing IFR coverage tonight and Thursday morning.
MVFR/VFR Thursday.

Vicinity of KSFO...IFR developing overnight with IFR prevailing
Thursday morning. West wind near 10 knots, the marine temperature
inversion weakening and lifting tonight will allow stratus and fog
to move inland. VFR returning Thursday late morning or afternoon.

SFO Bridge Approach...Similar to KSFO.

Monterey Bay Terminals...IFR ceilings tonight and Thursday morning.
Patchy light drizzle possible late tonight and Thursday morning.
Ceilings lifting to MVFR/VFR either late Thursday morning or
afternoon.

&&

.MARINE...As of 8:54 PM PDT Wednesday...Northwest winds will
shift to southerly late in the week. An upper level low pressure
system will move southward over the California offshore waters
reaching southern California Friday morning. Mixed northwest and
south swell will continue through Thursday. A longer period
northwest swell will arrive on Friday.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .Tngt...SCA...Pt Arena to Pigeon Pt 10-60 nm
             SCA...Pt Arena to Pt Reyes 0-10 nm

&&

PUBLIC FORECAST: Dykema
AVIATION/MARINE: Canepa

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