The Bay Area had its first summer heat wave starting June 17th and lasting until the 23rd. Strong high pressure and offshore flow brought record breaking heat to the area not seen since 2008 and 2006.
Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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.
The Bay Area had its first summer heat wave starting June 17th and lasting until the 23rd. Strong high pressure and offshore flow brought record breaking heat to the area not seen since 2008 and 2006. The heat wave stretched across much of the rest of the state as well as the Desert Southwest. Heat Advisories and Excessive Heat Warnings were issued across the Central Coast. There were at least two confirmed human fatalities in Santa Clara county from the heat as well as widespread power outages.
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 18, 12:53 PM PST, 1 hour 7 minutes earlier.
Area Forecast Discussion
National Weather Service San Francisco Bay Area
153 PM PDT Sun Jun 18 2017
...Very warm to hot conditions to continue inland through
Thursday...
.SYNOPSIS...Very warm to hot weather is forecast to continue
across inland areas through at least Thursday as strong high
pressure persists over California. Slight cooling is expected
over the next few days, but cooling won't be sufficient to
mitigate heat risks. A heat advisory continues in effect for most
inland areas through Thursday.
&&
.DISCUSSION...As of 2:00 AM PDT Sunday...As expected very warm to
hot weather has been across the majority of our region today. As
of right now (150 PM) many locations away from the coast are in
the 90s to around 105 while closer to the ocean generally 70s and
80s are found. Through 1230 PM San Francisco was the only
location to this point to break an official record. 88 was hit in
The City about an hour ago before a 7 degree drop hit at the
sensor. The previous record was only 86 set back in 1993. Moffett
Field has just came in with 98 which is 3 above the current
record. An additional record or two may be set before the day is
done.
Satellite shows clear skies across our entire CWA, however clouds
are starting to advance up the coast from the SLO waters. This
trend should continue with a southerly pressure gradient near the
surface in place. The marine layer is quite compressed, so any
clouds that move in tonight should stay mostly confined to the
coast. Morning lows will again be quite warm above 1000 feet (60s
and 70s) with most urban spots dropping into the 55 to 65 degree
range.
Several more days of very warm to hot weather can be expected as
the ridge overhead remains the dominate feature into Thursday. 500
MB heights will stay generally 590DM to 594DM while 850MB temps
remain between 26C and 29C. For most locations highs today will be
the hottest of the week, however through Thursday the remaining
days will still be quite warm. The heat advisory remains in effect
for that time period. Also worth noting that highs on Thursday
will likely be close to the numbers from today.
The ridge will begin to weaken and progress to the east later in
the week which will translate into a return to temperatures closer
to normal going into the weekend next next work week. Many inland
spots for Saturday and Sunday will just be in the 80s to the lower
90s.
&&
.AVIATION...As of 10:45 AM PDT Sunday...For 18Z TAFs. Clear skies
and vfr this afternoon and evening. Models starting to hint at
shallow marine layer possibly returning early Monday morning. Low
confidence on that and have just put some tempo cigs into Monday
morning time period for now.
Vicinity of KSFO...VFR conditions expected. Light to moderate
westerly seabreeze this afternoon/evening. Some concern for low
cigs by 12z Monday but that is low confidence at this time.
SFO Bridge Approach...Similar to KSFO.
Monterey Bay Terminals...VFR this afternoon and evening. Some
concern for low cigs returning to kmry late tonight into Monday
morning.
&&
.CLIMATE...
Here is a list of record high temperatures for Sunday and Monday
along with the most recent date it occurred.
SF BAY AREA Sunday Monday
LOCATION.................Temp/Year Temp/Year
KENTFIELD...............102/1945.............107/1920
SAN RAFAEL.............. 98/1962..............97/1973
NAPA....................110/1920.............109/1981
SAN FRANCISCO........... 86/1993..............92/1920
SFO AIRPORT............. 88/1981..............92/1962
OAKLAND AIRPORT......... 93/1962..............95/1962
RICHMOND................ 85/1957 .............94/1981
LIVERMORE...............105/1918.............109/1981
MOFFETT FIELD........... 95/1993..............96/1981
SAN JOSE................ 99/1945.............101/1920
GILROY..................102/1981.............108/1981
MONTEREY BAY AREA Sunday Monday
LOCATION.................Temp/Year Temp/Year
SALINAS................. 85/1962.............87/2008
SALINAS AIRPORT......... 90/1945.............88/2008
KING CITY...............102/1962............104/1981
&&
.MARINE...as of 10:40 AM PDT Sunday...The strong northerly
pressure gradient will gradually weaken this afternoon and
evening, allowing for winds to subside south of Point Reyes.
Winds will increase again Monday as the gradients strengthen.
Seas are expected to deteriorate by midweek, especially over the
outer waters north of Point Reyes, as winds approach and possibly
exceed gale force.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
.Tngt...Heat Advisory...CAZ506-507-510>513-516>518
SCA...Pt Arena to Pt Reyes 0-10 nm
SCA...Pt Arena to Pigeon Pt 10-60 nm
SCA...Pigeon Pt to Pt Piedras Blancas 10-60 nm until 3 PM
&&
PUBLIC FORECAST: Bell
AVIATION: RWW
MARINE: RWW
CLIMATE: MM/Dykema
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www.youtube.com/nwsbayareaThe national radar mosaic for the moment the first event began.
3 heat. Local standard time, as filed.
Over 5,000 residents in Livermore and over 2,000 in Concord lost power due to the heat|http://abc7news.com/weather/thousands-left-without-power-on-scorching-hot-day/2116951/ http://sanfrancisco.cbslocal.com/2017/06/20/bay-area-heat-wave-flex-alert-conserve-electricity/.
Two heat related deaths were reported on Monday June 19th. Two elderly residents in San Jose died of hyperthermia http://www.mercurynews.com/2017/06/21/state-agency-asks-for-energy-conservation-as-temperatures-soar-across-california/. Timing is an estimation.
Several hundred residents were without power across the San Francisco Bay Area on Tuesday night due to the heat http://www.ktvu.com/weather/weather-news-headlines/262766743-story.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2017Every state in 2017This day in weather historyWarnings in California, June 2017
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: 701206, 701207, 701211.