On June 11th five teenagers were pulled from the water at Ocean Beach in San Francisco two of which were in serious condition. Four of the teenagers needed to be hospitalized.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS MTR wrote it up.
On June 11th five teenagers were pulled from the water at Ocean Beach in San Francisco two of which were in serious condition. Four of the teenagers needed to be hospitalized.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Francisco Bay Area, CA wrote its last area forecast discussion before the first event at Jun 11, 9:41 AM PST, 2 hours 49 minutes earlier.
Area Forecast Discussion
National Weather Service San Francisco Bay Area
1041 AM PDT Thu Jun 11 2020
.SYNOPSIS...Coastal cooling today while sunny and warm weather
continues inland. The marine layer deepens overnight as westerly
winds increase ahead of an incoming trough. Breezy and much
cooler, especially inland on Friday with highs in the 70s.
Continued breezy and cool on Saturday. Warming trend starts Sunday
and lasts into next week with seasonable temperatures forecast.
&&
.DISCUSSION...as of 08:45 AM PDT Thursday... A broad trough
centered in the Gulf of Alaska will bear down on the region
Friday and Saturday. The main impact will be a significant
cooling trend from Thursday into Friday (with additional minor
cooling Friday into Saturday) and breezy to gusty onshore winds.
Short term models support another round of coastal drizzle
tonight and into Friday morning. Also can not rule out trough
influence acting on marine layer bringing additional light coastal
sprinkles Friday night into Saturday morning. Temperatures are
forecast to fall generally 4 to 6 degrees nearshore (highs low 60s
to low 70s) and 10 to 18 degrees inland (highs mid 70s around 80)
between today and tomorrow. Onshore winds will peak Friday
afternoon and evening with peak gusts ranging in the 25 to 40 mph
range over the coast and higher terrain. Infrequent gusts in the
windiest locations may approach 45 to 50 mph. Short term model
output indicates that this system will primarily be dry though a
few isolated sprinkles are possible. Main forecast challenge today
will be dialing in the peak wind gusts and deciding if a wind
advisory for some zones will be necessary. Otherwise, no
significant updates planned this morning -- see previous
discussion for additional information on the current forecast.
.PREVIOUS DISCUSSION...as of 3:11 AM PDT Thursday...The marine
layer has returned to the coast with clouds over the ocean and the
inversion depth around 1000 feet. Low clouds are already
developing inside the Bay with ceilings being reported at SFO/OAK
and Hayward. Onshore gradients are 2.5 mb from SFO to Sac with
west winds from the Golden Gate out into the Delta. These signs of
course all point to a cooling trend today that will be most
noticed along the coast and inside the Bay. The interior valleys
will remain warm with the overall airmass over the region still
supporting 850 mb temps around 20 celsius which should still bring
some inland highs into the lower 90s.
The seabreeze will be stronger this afternoon and evening as the
marine layer will deepen rapidly in response to an approaching
well defined 500 mb trough. As it approaches from the west tonight
the marine layer will likely deepen to at least 3500 feet by
early Friday morning with some coastal drizzle. There will be
enough cold air aloft to essentially mix the inversion layer out
on Friday as the main upper trough axis passes over the Bay Area.
The big weather story for Friday will be inland areas cooling at
least 20 degrees from Thursday to Friday so places like Livermore
could see highs in the low 90s today followed by lower 70s Friday.
In addition to the much cooler inland temperatures on Friday we
will see another round of gusty onshore winds. This will be driven
by both the syntopic pattern as well as the locally strong
seabreeze circulations driven by the large surface pressure
gradients. Wind prone locations such as the Marin Headlands, SFO
and the Altamont should see gusts in the 30-35 mph range on Friday
making things feel blustery for mid June.
Similar to last weekend a second shortwave will rotate into the
main trough and keep temperatures cool with breezy northwest winds
for Saturday. Isolated showers will be possible both Friday and
Saturday due to steep lapse rates but moisture is limited and any
precip will be of little impact compared to the wind and
unseasonably cool afternoon highs.
High pressure begins to rebuild Sunday as temperatures rebound
back towards seasonable norms. Current pattern for next week looks
nice with the main trough to our north but still enough of a
gradient to perhaps keep widespread stratus formation in check.
Daytime highs should be seasonably warm with no strong/hot ridges
foreseen at this time though a building ridge from the East Pac could
arrive by the last week of June.
&&
.AVIATION...As of 10:41 AM PDT Thursday...For 18Z TAFs. The low
clouds from this morning have cleared from the terminals with VFR
conditions observed as of the 18Z TAF publication time. Visible
satellite imagery stills shows the low clouds blanketing immediate
Pacific Coast in San Francisco City/County, San Mateo County, and
also along parts of the Monterey County Coast. For the terminals,
expect VFR conditions to continue through much of the day with
passing high clouds and increasing west winds this afternoon. An
approaching trough over the next 24-36 hours will help to deepen
the marine layer...expect the ceilings to return overnight and
into Friday morning with the potential for stronger onshore winds
tomorrow.
Vicinity of KSFO...VFR conditions are forecast today with passing
high clouds. West winds will increase this afternoon sustained
around 18-20 kt with higher gusts. Stratus returns after sunset
and into Friday morning.
SFO Bridge Approach...Similar to KSFO.
Monterey Bay Terminals...VFR conditions were observed at MRY and
SNS as of the 18Z TAF publication time. Visible satellite imagery
shows the low clouds still hugging along the Monterey Bay
Shoreline and around the Monterey Peninsula. Some of these low
clouds may stick around all day, particularly around the Monterey
Peninsula. Ceilings are forecast to return in the
evening/overnight hours to MRY and SNS.
&&
.MARINE...as of 08:32 AM PDT Thursday...Moderate to locally gusty
northwest winds will persist across the coastal waters today, and
further increase on Friday. The strongest winds will occur on
Friday afternoon and evening when isolated gale-force gusts are
possible. These winds will generate steep fresh swell resulting in
hazardous seas conditions for small crafts. Short period wind
generated northwest waves will continue through late week at
periods around 6 to 9 seconds along with a long period southerly
swell.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
.Tday...SCA...Pt Reyes to Pigeon Pt 0-10 nm from 3 PM
SCA...Pigeon Pt to Pt Pinos 0-10 nm from 3 PM
SCA...Pt Arena to Pigeon Pt 10-60 nm from 3 PM
SCA...Pigeon Pt to Pt Piedras Blancas 10-60 nm from 3 PM
SCA...Pt Arena to Pt Reyes 0-10 nm
SCA...Pt Pinos to Pt Piedras Blancas 0-10 nm
SCA...SF Bay from 3 PM
SCA...Mry Bay from 3 PM
&&
PUBLIC FORECAST: DRP/RWW
AVIATION: Rowe
MARINE: Rowe
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www.youtube.com/nwsbayareaThe national radar mosaic for the moment the first event began.
1 rip current. Local standard time, as filed.
Five teenagers were rescued from Ocean Beach Thursday afternoon. Two were listed in serious condition and four were hospitalized https://abc7news.com/sf-rescue-beach-ocean-san-francisco/6243222/.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2020Every state in 2020This day in weather historyWarnings in California, June 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 892091.