The combination of high pressure and strong offshore flow resulted in an early season heat wave across the Bay Area from June 9th to the 11th. Multiple daily records were broken across the region and multiple power outages were reported due to the heat.
Every event with a place to put it; 7 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 combination of high pressure and strong offshore flow resulted in an early season heat wave across the Bay Area from June 9th to the 11th. Multiple daily records were broken across the region and multiple power outages were reported due to the heat. Approximately 26,000 people across the region lost power on Monday followed by an additional 30,000 on Tuesday. Three fatalities were reported during the heat event. One man died as a direct result of heat related illness while two others drowned while attempting to cool down during the heat wave. Hot temperatures and dry grass resulted in a vegetation fire that spread to a residence.
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 10, 10:17 AM PST, 2 hours 43 minutes earlier.
Area Forecast Discussion
National Weather Service San Francisco Bay Area
1117 AM PDT Mon Jun 10 2019
.SYNOPSIS...Record to near record breaking heat will persist over
much of the region today. Cooling will then arrive late this evening
into Tuesday near the coast with continued above average
temperatures over the interior. More seasonable temperatures along
with night and morning coast low clouds will return region-wide late
in the week.
&&
.DISCUSSION...as of 08:48 AM PDT Monday...The much advertised hot
weather will peak today across the Bay Area. Morning satellite
shows widespread upper level clouds over the region. The high
clouds and warm airmass keep temperatures rather mild across the
region this morning. As noted before, most urban areas stayed in
the 60s and 70s overnight not allowing for much relief from
Sunday's hot weather. Latest 24 hour trend shows many locations
running several degrees warmer than yesterday at this time.
For the rest of today the big impact message continues be focus on
heat and the potential record breaking temperatures this
afternoon. SFO has a forecast high of 96 degs and the record is
94. Interesting to note that the overnight lows at SFO will likely
break records for maximum overnight low temperatures too. Bottom
line is be weather smart and weather aware today. Try to reduce
strenuous activities during peak heating, stay hydrated, check on
elderly or the infirmed and never leave children or pets in
vehicles.
Current forecast is on track and no reason to update this morning.
The next question is relief? When will we see some relief? Very
typical following a heat event is a southerly surge. Latest hi-res
models still indicate a wind reversal along the coast later today.
The wind switch is usually indicative of a southerly surge.
Satellite imagery does indicates some low clouds near Pt
Conception trying to move north. Will have to watch the
northward progression, but latest thinking is late this
afternoon/evening with clouds moving up the coast bringing some
coastal relief. Interior portions of the Bay Area will still
remain hot.
&&
.PREV DISCUSSION...as of 4:17 AM PDT Monday...A very warm to hot air
mass remains parked over the region this morning with most urban
areas holding in the 60s to even lower 70s. Cooler conditions are
reported in the North Bay Valleys where temperatures have dropped
into the upper 50s. These values are a few to as much as 15
degrees warmer compared to this time yesterday. Thus, temperatures
will be off to a warm start this morning and will rapidly begin
to warm after sunrise.
The high pressure aloft will become centered over the West Coast by
this afternoon with 850 MB temperatures warming to around 20-23 deg
C. While offshore winds are not as strong as 24 hours ago, they
persist and will once again push very warm to hot temperatures to
coastal areas this afternoon. Look for coastal temperatures to be
similar to those yesterday if not even a few degrees warmer.
Meanwhile, interior locations will likely be a few to several
degrees warmer this afternoon with more widespread triple digit
readings (100-105 deg F). With this, a Heat Advisory is in effect
from 10 AM to 9 PM today for all interior valley locations, the San
Francisco Bay Shoreline as well as the City of San Francisco.
Forecast confidence is high for inland temperatures but much lower
near the coast as onshore flow is forecast to return at some point
this afternoon. If onshore flow does return earlier in the
afternoon, coastal areas may be slightly cooler in some locations.
The short-range forecast models continue to depict the development
of a southerly surge along the Big Sur coast late this afternoon.
This would likely result in southerly low level winds, shallow
marine layer and fog to spread northward along the coast and as far
north as Santa Cruz by this evening. If this does occur, those
locations impacted by the southerly surge will see a rapid decrease
in temperatures.
The marine layer will begin to deepen along the entire coast by
Tuesday morning with increased onshore flow likely. This will bring
cooling to coastal areas and adjacent valleys on Tuesday which will
lower heat risks. Meanwhile, the warm air mass will remain in place
and allow for above average temperatures to persist in the interior
valleys and higher elevations.
The ridge will weaken during the second half of the week in response
to an approaching mid/upper level trough. This will help to deepen
the marine layer, increase onshore flow and bring cooling to inland
areas. Thus, look for temperatures to cool back to near seasonal
averages by late in the week with periods of night/morning low
clouds near the coast and coastal valleys. These conditions will
likely persist into the upcoming weekend as well with near zonal
flow aloft and moderate onshore flow in the boundary layer. Dry
weather conditions are also likely to persist through the forecast
period.
&&
.AVIATION...as of 10:55 AM PDT Monday...For 18Z TAFs. A thermal
trough along the coast will maintain light winds across area
terminals along with mostly clear skies with the exception of
scattered high clouds that will continue to stream in aloft.
Vicinity of KSFO...VFR. Light/variable winds...becoming west to
northwest around 10 kt in the afternoon.
SFO Bridge Approach...Similar to KSFO.
Monterey Bay Terminals...VFR. East to southeast winds this
morning are expected to transition onshore around mid-day.
&&
.MARINE...as of 4:17 AM PDT Monday...Generally light winds will
prevail over the coastal waters during the day as high pressure
remains over the eastern Pacific. Locations along the immediate
Pacific Coast south of the Golden Gate may see some locally breezy
conditions this afternoon as winds become more southerly. A
light, mixed northwest and southerly swell are forecast to prevail
through the middle of the week.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
.Tday...Heat Advisory...CAZ006-506-508-510-513-516-528
&&
PUBLIC FORECAST: MM/RGass
AVIATION: CW
MARINE: Rowe
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www.youtube.com/nwsbayareaThe national radar mosaic for the moment the first event began.
4 heat, 3 excessive heat, 1 wildfire. Local standard time, as filed.
Santa Clara County medical examiner announced the death of an 83 year old man found in front of his home due to heat. Time unknown.
A 14 year old boy died after drowning in the Bay at Crissy Field. The boy was in the water to cool down due to the high heat across the area but could not swim https://www.nbcbayarea.com/news/local/SFFD-Rescue-Child-From-511090771.html.
The heat wave across the region triggered power outages knocking out service to 26,400 people across 9 counties on Monday followed by an additional 30,400 on Tuesday https://www.eastbaytimes.com/2019/06/11/pge-transformers-in-bay-area-cant-always-cope-with-heat-waves/?utm_campaign=socialflow&utm_medium=social&utm_source=twitter.com&utm_content=tw-EastBayTimes.
The heat wave across the region triggered power outages knocking out service to 26,400 people across 9 counties on Monday followed by an additional 30,400 on Tuesday https://www.eastbaytimes.com/2019/06/11/pge-transformers-in-bay-area-cant-always-cope-with-heat-waves/?utm_campaign=socialflow&utm_medium=social&utm_source=twitter.com&utm_content=tw-EastBayTimes.
Excessive heat across the region caused 26,400 people to lose power on Monday followed by an additional 30,400 on Tuesdsay https://www.nbcbayarea.com/news/local/The-Heat-is-On-Bay-Area-Expected-to-Continue-Seeing-Scorching-Temperatures-511107952.html.
Bay Area Rapid Transit reported system wide service delays due to equipment problems as a result of the heat https://www.nbcbayarea.com/news/local/The-Heat-is-On-Bay-Area-Expected-to-Continue-Seeing-Scorching-Temperatures-511107952.html. Timing was estimated.
San Jose Fire Department reported a vegetation fire in the San Jose Foothills that damaged one home. The hot temperatures made fire fighting efforts difficult resulting in one firefighter suffering from heat exhaustion http://www.ktvu.com/news/ktvu-local-news/firefighter-suffers-heat-exhaustion-battling-house-fire-in-east-foothills-of-san-jose.
A 34 year old man was swimming approximately 60 yards offshore at the south end of Stinson Beach. Crews searched and ultimately found the man deceased the next morning. The heat wave across the region may have contributed to the man being in the water https://www.marinij.com/2019/06/12/marin-city-man-found-dead-at-stinson-beach/?utm_content=tw-marinij&utm_campaign=socialflow&utm_medium=social&utm_source=twitter.com.
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| Heat, Santa Clara Valley Including San Jose | 2019-06-10 | 83 | Male | Outside/Open Areas | Direct |
| Heat, San Francisco | 2019-06-10 | 14 | Male | In Water | Indirect |
| Heat, Coastal North Bay Including Point Reyes National Seashore | 2019-06-11 | 34 | Male | In Water | Indirect |
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2019Every state in 2019This day in weather historyWarnings in California, June 2019
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: 824254, 824286, 824289, 824290, 824291, 824292, 824261, 824288.