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United States / Pacific / California

San Mateo County, California

Quiet Today‹ Wed, Oct 28Today, local timeCalendar
Alert me about San Mateo County

No official warning is in effect. And 2 other official alerts (watches, advisories, statements), not counted as warnings. Every kind of source we watch here answered.

0Warnings in effect
48Headlines, 24 h
26Sources answering
3Held, not published
Live

Radar

RainViewer (NOAA NEXRAD) · the past two hours
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Air Traffic

live · adsb.lol, adsb.fi

Road Traffic

speeds, incidents, closures and work zones · cameras

Rivers And Streams

10 USGS gauges

From The Archive

historic photos of this county1 historic photo · 1950s
Pillar Point Harbor Sign, Half Moon Bay
1950–1980 Pillar Point Harbor Sign, Half Moon BayArchive & Atlas — archive.archiveandatlas.com · Carl Hahn · CC BY-NC

Photos from Archive & Atlas’ The Archive, an Atlas Data Industries service, are placed in this county by where each was taken; each is shown whole and linked to its record. New photos appear here as The Archive adds them.

What Each Status Rests On

every topic · open one for its records

What Each Status Rests On

Open a topic for its records
WeatherQuiet20 river gauges reading now, shown against their usual but not yet judged.
← Overview

Weather

Quiet

20 river gauges reading now, shown against their usual but not yet judged.

Official Warnings

No official warning is in effect here right now.

Other Official Alerts, Quoted In Full

Watches, advisories and statements. Not warnings, and not counted as warnings.

Coastal Flood Advisory
“Coastal Flood Advisory issued October 29 at 4:23AM PDT until October 31 at 6:00PM PDT by NWS San Francisco CA”
* WHAT...Up to 1.9 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. * WHERE...Bay Shoreline locations of San Pablo Bay, San Francisco Bay, and Monterey Bay. * WHEN...Until 6 PM PDT Saturday. * IMPACTS...High tides will result in flooding of low-lying infrastructure, isolated road closures, and coastal erosion. Rising tides will bring water and waves farther up the beach than normal, restricting escape from beaches and coastal areas. More substantial impacts are expected along bayshore Marin County where increased flooding is anticipated across low lying areas. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be 1.9 ft above normal (7.7 ft MLLW) at 01:43 PM Thursday 10/29, 1.6 ft above normal (7.4 ft MLLW) at 02:39 PM Friday 10/30, and 1.1 feet above normal (6.9 ft MLLW) at 03:44 PM on Saturday 10/31. These predictions include up to 1.2 ft of surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
National Weather Service · issued Oct 29, 4:23 AM PDT · expires Oct 29, 10:00 PM PDT · Issuer
Coastal Flood Advisory
“Coastal Flood Advisory issued October 29 at 4:23AM PDT until October 30 at 5:00PM PDT by NWS San Francisco CA”
* WHAT...Up to 1.9 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. * WHERE...Pacific Coast. * WHEN...Until 5 PM PDT Friday. * IMPACTS...High tides will result in flooding of low-lying infrastructure, isolated road closures, and coastal erosion. Rising tides will bring water and waves farther up the beach than normal, restricting escape from beaches and coastal areas. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be 1.9 ft above normal (7.7 ft MLLW) at 01:43 PM Thursday 10/29, and 1.6 ft above normal (7.4 ft MLLW) at 02:39 PM Friday 10/30. These predictions include up to 1.2 ft of surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
National Weather Service · issued Oct 29, 4:23 AM PDT · expires Oct 29, 10:00 PM PDT · Issuer
  • Pilarcitos C Bl Stone Dam Near Hillsborough, CA: flow 2.08 ft³/s · this gauge’s October monthly average is usually below 2.06 ft³/s · U.S. Geological Survey · 1 h ago
  • Pilarcitos C A Half Moon Bay, CA: flow 4.04 ft³/s · this gauge’s October monthly average is usually below 3.06 ft³/s · U.S. Geological Survey · 1 h ago
  • San Mateo C Bl Lo Crystal Sp Reservoir Near San Mateo, CA: flow 3.75 ft³/s · within the usual October monthly average for this gauge · U.S. Geological Survey · 35 min ago
  • Butano C Near Pescadero, CA: flow 0.96 ft³/s · within the usual October monthly average for this gauge · U.S. Geological Survey · 50 min ago
  • Pilarcitos C Bl Spillway Near Hillsborough, CA: flow 2.55 ft³/s · within the usual October monthly average for this gauge · U.S. Geological Survey · 50 min ago
More (15)
  • Pilarcitos C Ab Stone Dam Near Hillsborough, CA: flow 3.35 ft³/s · within the usual October monthly average for this gauge · U.S. Geological Survey · 50 min ago
  • San Mateo C Ab Junction Box A Dam1 Near Hillsborough: flow 0 ft³/s · within the usual October monthly average for this gauge · U.S. Geological Survey · 50 min ago
  • San Mateo C Bl Junction Box A Dam1 Near Hillsborough: flow 0 ft³/s · within the usual October monthly average for this gauge · U.S. Geological Survey · 50 min ago
  • San Gregorio C A San Gregorio, CA: flow 2 ft³/s · within the usual October monthly average for this gauge · U.S. Geological Survey · 1 h ago
  • Pescadero C Near Pescadero, CA: flow 3.79 ft³/s · within the usual October monthly average for this gauge · U.S. Geological Survey · 1 h ago
  • Gauge 11162753: water level 4.14 ft · not enough history for this gauge to say what is usual · U.S. Geological Survey · 35 min ago
  • Gauge 11162540: water level 3.88 ft · not enough history for this gauge to say what is usual · U.S. Geological Survey · 50 min ago
  • Gauge 111626182: water level 2.48 ft · not enough history for this gauge to say what is usual · U.S. Geological Survey · 50 min ago
  • Gauge 11162619: water level 1.11 ft · not enough history for this gauge to say what is usual · U.S. Geological Survey · 50 min ago
  • Gauge 11162735: water level -0.02 ft · not enough history for this gauge to say what is usual · U.S. Geological Survey · 50 min ago
  • Gauge 11162737: water level 0.3 ft · not enough history for this gauge to say what is usual · U.S. Geological Survey · 50 min ago
  • Gauge 11162570: water level 3.72 ft · not enough history for this gauge to say what is usual · U.S. Geological Survey · 1 h ago
  • Gauge 11162500: water level 1.88 ft · not enough history for this gauge to say what is usual · U.S. Geological Survey · 1 h ago
  • Gauge 11162620: water level 5.11 ft · not enough history for this gauge to say what is usual · U.S. Geological Survey · 1 h ago
  • Gauge 11162630: water level 2.82 ft · not enough history for this gauge to say what is usual · U.S. Geological Survey · 1 h ago

River levels are shown against their usual, but not yet judged. A gauge’s usual here is its range of October monthly averages; the reading is the latest 15-minute value, which a passing rain or dry spell can carry outside that range. So no river gauge makes this county Unusual For Here until we compare each day with the same day’s history.

A gauge’s usual is its range of October monthly averages over its record (USGS).

  • USGS daily mean streamflow and gage height - California: 20 entries for this county · U.S. Geological Survey · read 12 h ago
  • NWS active alerts: 2 entries for this county · National Weather Service · read 4 min ago

Entries are what each state or utility feed lists for this county: incidents, closures or outage areas. We count them; we do not reproduce them.

The sources behind this status (92)

Sources that cover this county by name, and state or national sources that have placed records on it in the last week, by their latest read. A state-wide source that has placed nothing here is not listed.

Answering with records (3)

Answered, nothing current (89)

SafetyQuiet8 sources answered; nothing recent here.
← Overview

Safety

Quiet

8 sources answered; nothing recent here.

The sources behind this status (8)

Sources that cover this county by name, and state or national sources that have placed records on it in the last week, by their latest read. A state-wide source that has placed nothing here is not listed.

Answered, nothing current (7)

Not current (1)

Roads And TransitQuiet3 entries from WZDx 4.1 work zones (mtc) (Metropolitan Transportation Commission San Francisco) for this county, in its latest read.
← Overview

Roads And Transit

Quiet

3 entries from WZDx 4.1 work zones (mtc) (Metropolitan Transportation Commission San Francisco) for this county, in its latest read.

  • WZDx 4.1 work zones (mtc): 3 entries for this county · Metropolitan Transportation Commission San Francisco · read 12 min ago

Entries are what each state or utility feed lists for this county: incidents, closures or outage areas. We count them; we do not reproduce them.

The sources behind this status (8)

Sources that cover this county by name, and state or national sources that have placed records on it in the last week, by their latest read. A state-wide source that has placed nothing here is not listed.

Answering with records (5)

  • Bay Area Rapid Transit (BART): Bay Area Rapid Transit (BART) GTFS-RT service alerts · newest record Oct 29, 7:30 AM PDT · read 4 min ago
  • Caltrain: Caltrain GTFS-RT trip updates · newest record Oct 29, 7:27 AM PDT · read 7 min ago
  • Caltrain: Caltrain GTFS-RT vehicle positions · newest record Oct 29, 7:29 AM PDT · read 5 min ago
  • Caltrain: Caltrain GTFS-RT service alerts · newest record Oct 29, 7:30 AM PDT · read 4 min ago
  • Metropolitan Transportation Commission San Francisco: WZDx 4.1 work zones (mtc) · 3 records placed on this county in its latest read · read 12 min ago

Answered, nothing current (3)

GovernmentQuiet8 reports in the last 24 hours, none published as an event.
← Overview

Government

Quiet

8 reports in the last 24 hours, none published as an event.

Coming Up

No meeting is on an agenda we read for the next seven days.

More (3)
The sources behind this status (95)

Sources that cover this county by name, and state or national sources that have placed records on it in the last week, by their latest read. A state-wide source that has placed nothing here is not listed.

Answering with records (5)

  • Half Moon Bay city · newest record Feb 11, 1:44 PM PST · read Oct 21, 11:39 PM PDT
  • Hillsborough town · newest record Oct 19, 3:17 PM PDT · read Oct 21, 11:50 PM PDT
  • San Mateo city · newest record Oct 19, 1:35 PM PDT · read Oct 22, 9:55 PM PDT
  • San Mateo city · newest record Sep 23, 11:21 AM PDT · read Oct 21, 10:58 PM PDT
  • San Mateo city · newest record Oct 28, 4:23 PM PDT · read 1 h ago

Answered, nothing current (80)

Not current (10)

Local NewsQuiet5 reports in the last 6 hours, none published as an event.
← Overview

Local News

Quiet

5 reports in the last 6 hours, none published as an event.

More (20)

And 14 more reports in the last 24 hours, not listed here.

The sources behind this status (4)

Sources that cover this county by name, and state or national sources that have placed records on it in the last week, by their latest read. A state-wide source that has placed nothing here is not listed.

Answering with records (3)

Answered, nothing current (1)

HealthQuiet1 report in the last 24 hours, none published as an event.
← Overview

Health

Quiet

1 report in the last 24 hours, none published as an event.

  • Wastewater site 147: COVID-19 (SARS-CoV-2) level 7.34 · within the usual weekly level for this site · CDC National Wastewater Surveillance System · Oct 17, 5:00 PM PDT
  • Wastewater site 148: COVID-19 (SARS-CoV-2) level 8.67 · within the usual weekly level for this site · CDC National Wastewater Surveillance System · Oct 17, 5:00 PM PDT
  • Wastewater site 170: COVID-19 (SARS-CoV-2) level 6.94 · within the usual weekly level for this site · CDC National Wastewater Surveillance System · Oct 17, 5:00 PM PDT
  • Wastewater site 147: influenza A level 11.12 · within the usual weekly level for this site · CDC National Wastewater Surveillance System · Oct 17, 5:00 PM PDT
  • Wastewater site 148: influenza A level 10.05 · within the usual weekly level for this site · CDC National Wastewater Surveillance System · Oct 17, 5:00 PM PDT
More (4)
  • Wastewater site 170: influenza A level 5.29 · within the usual weekly level for this site · CDC National Wastewater Surveillance System · Oct 17, 5:00 PM PDT
  • Wastewater site 147: RSV level 3.34 · within the usual weekly level for this site · CDC National Wastewater Surveillance System · Oct 17, 5:00 PM PDT
  • Wastewater site 148: RSV level 2.74 · within the usual weekly level for this site · CDC National Wastewater Surveillance System · Oct 17, 5:00 PM PDT
  • Wastewater site 170: RSV level 1.27 · within the usual weekly level for this site · CDC National Wastewater Surveillance System · Oct 17, 5:00 PM PDT
The sources behind this status (15)

Sources that cover this county by name, and state or national sources that have placed records on it in the last week, by their latest read. A state-wide source that has placed nothing here is not listed.

Answering with records (8)

Answered, nothing current (7)

AirQuietRedwood City: AQI 20, within the usual daily AQI in October for this county.
← Overview

Air

Quiet

Redwood City: AQI 20, within the usual daily AQI in October for this county.

  • Redwood City: AQI 20 · within the usual daily AQI in October for this county · U.S. EPA AirNow · 1 h ago
  • USGS latest streamflow and gage height - California: 20 entries for this county · U.S. Geological Survey · read 24 min ago
  • AirNow reporting-area AQI (current and forecast): 9 entries for this county · U.S. EPA AirNow · read 1 h ago

Entries are what each state or utility feed lists for this county: incidents, closures or outage areas. We count them; we do not reproduce them.

The sources behind this status (36)

Sources that cover this county by name, and state or national sources that have placed records on it in the last week, by their latest read. A state-wide source that has placed nothing here is not listed.

Answering with records (2)

Answered, nothing current (34)

PowerQuiet1 entry from Pacific Gas & Electric outage map (Esri ArcGIS) (Pacific Gas & Electric) for this county, in its latest read.
← Overview

Power

Quiet

1 entry from Pacific Gas & Electric outage map (Esri ArcGIS) (Pacific Gas & Electric) for this county, in its latest read.

  • Pacific Gas & Electric outage map (Esri ArcGIS): 1 entry for this county · Pacific Gas & Electric · read 12 min ago

Entries are what each state or utility feed lists for this county: incidents, closures or outage areas. We count them; we do not reproduce them.

The sources behind this status (8)

Sources that cover this county by name, and state or national sources that have placed records on it in the last week, by their latest read. A state-wide source that has placed nothing here is not listed.

Answering with records (2)

Answered, nothing current (6)

Freight And EconomyMatters NowRegular gasoline, San Francisco, week of 2026-10-19: $6.001 a gallon, down 15 cents from the week before.
← Overview

Freight And Economy

Matters Now

Matters Now

Quiet

  • Layoff and closure notices (WARN): No notice naming a place here in the last 30 days · California EDD · read 54 min ago
  • Rail accidents and crossings (FRA): No reported accident or crossing collision here with a release, evacuation, injury or death in the latest data · Federal Railroad Administration · read Oct 26, 6:27 AM PDT

Background

  • Gasoline prices (EIA)
    Regular gasoline, California, week of 2026-10-19: $6.031 a gallon, down 7 cents from the week before. U.S. Energy Information Administration
  • Gasoline prices (EIA)
    Regular gasoline, West Coast (PADD 5), week of 2026-10-19: $5.557 a gallon, down 8 cents from the week before. U.S. Energy Information Administration
  • Layoff and closure notices (WARN)
    Oracle America, Inc., 500 Oracle Parkway Redwood City CA 94065: layoff, 279 workers; starts 2026-11-13. California EDD
  • Layoff and closure notices (WARN)
    LeeMah Electronics, 15 South Hill Drive Brisbane CA 94005: closure, 62 workers; starts 2026-12-21. California EDD
  • Layoff and closure notices (WARN)
    Arsenal Biosciences, Inc., 329 Oyster Point Blvd South San Francisco CA 94080: layoff, 58 workers; starts 2026-10-29. California EDD
  • Layoff and closure notices (WARN)
    Cellares Corporation, 1100 Veterans Boulevard South San Francisco CA 94080: layoff, 100 workers; starts 2026-10-20. California EDD
  • Layoff and closure notices (WARN)
    LeeMAH Electronics, 155 South Hill Drive Brisbane CA 94005: closure, 205 workers; starts 2026-10-16. California EDD
  • Layoff and closure notices (WARN)
    Flying Food Group, LLC, 50 Adrian Ct Burlingame CA 94010: closure, 72 workers; starts 2026-10-13. California EDD
  • Layoff and closure notices (WARN)
    Visa, 900 Metro Center Blvd Foster City CA 94404: layoff, 320 workers; starts 2026-10-01. California EDD
  • Layoff and closure notices (WARN)
    Yerba Mate Co., LLC - South San Francisco, 225 Harris Court South San Francisco CA 94080: layoff, 1 worker; starts 2026-09-01. California EDD
  • Layoff and closure notices (WARN)
    LeeMAH Electronics, 155 South Hill Drive Brisbane CA 94005: closure, 212 workers; starts 2026-09-08. California EDD
  • Rail accidents and crossings (FRA)
    Rail accident, Peninsula Corridor Joint Powers Board - Caltrain, SOUTH SAN FRANCISCO, 2026-05-14. Reported by FRA with the May 2026 data. Federal Railroad Administration
  • Employment and wages (QCEW)
    Q1 2026: 413,139 jobs (411,314 a year earlier); $4,650 average weekly wage ($4,375 a year earlier). BLS (QCEW)

Each line is the source's own fields, linked to the source. Unusual is this county against its own history, never against other counties. FRA posts about three months after an accident, so its lines are reported, not breaking. Last read: BLS (QCEW) Oct 12, 6:25 AM PDT; U.S. Energy Information Administration Oct 26, 6:27 AM PDT; Federal Railroad Administration Oct 26, 6:27 AM PDT; California EDD Oct 29, 6:40 AM PDT.

WildlifeQuietNothing that matters now from 4 source families here.
← Overview

Wildlife And Ecosystems

Quiet

Quiet

  • Non-native species (USGS NAS): No new non-native species alert here in the last 30 days · USGS Nonindigenous Aquatic Species (NAS) · read Oct 12, 5:04 PM PDT
  • Bird flu in wild birds (APHIS): No detection in wild birds here in the last 30 days · USDA APHIS · read Oct 26, 6:27 AM PDT
  • Harmful algal blooms: No bloom reported on a water here in the last 14 days · California State Water Resources Control Board · read 34 min ago
  • Introduced species (iNaturalist): No introduced species newly recorded here · iNaturalist · read 8 min ago

Background

  • Introduced species (iNaturalist)
    85 research-grade observations of introduced species here in the last 30 days. iNaturalist

Each line is the source's own fields, linked to the source. Unusual is this county against its own history, never against other counties. Bird flu detections are reported in our words with a link to USDA APHIS; its records are not reproduced. iNaturalist observations are shown only under CC0 or CC-BY, with the observer credited; others are counted. Observations with an obscured location are never placed on a county. Last read: USGS Nonindigenous Aquatic Species (NAS) Oct 12, 5:04 PM PDT; iNaturalist Oct 29, 7:26 AM PDT; USDA APHIS Oct 26, 6:27 AM PDT; California State Water Resources Control Board Oct 29, 7:00 AM PDT.

Historic PlacesQuietNothing that matters now from 3 source families here.
← Overview

Historic Places

Quiet

Quiet

  • Historic places in harm’s way: No listed place here inside an active wildfire perimeter, warning area or flood zone · National Weather Service · read 4 min ago
  • National Register nominations (Federal Register): No nomination here under review · National Park Service (Federal Register) · read 34 min ago
  • National Register listings (NPS): No listing or removal here in the last 30 days · National Park Service · read Oct 12, 6:25 AM PDT

Background

  • National Register nominations (Federal Register)
    McDonald, Sam, Park, (African Americans in California, 1850-1974 MPS), 13435 Pescadero Creek Road, Loma Mar (San Mateo County, California), reference MP100013445: nominated, comments due 2026-09-29. National Park Service (Federal Register)
  • National Register listings (NPS)
    54 properties on the National Register in this county. National Park Service

Each line is the source's own fields, linked to the source. Sites whose location is restricted are never shown. A place inside a hazard area is our overlay of open maps, as of the hazard’s own time; it says nothing of damage. Last read: National Park Service Oct 12, 6:25 AM PDT; National Park Service (Federal Register) Oct 29, 7:00 AM PDT; National Weather Service Oct 29, 7:30 AM PDT.

River Gauges

the level now against its usual for the month

10 USGS gauges · updated 7:00 AM

Gauge 11162500
No usual yet · Steady · water level 1.88 ft
Not forecast by NWS · NWS gauge page
Gauge 11162540
No usual yet · Steady · water level 3.88 ft
Not forecast by NWS · NWS gauge page
Gauge 11162570
No usual yet · Steady · water level 3.72 ft
Not forecast by NWS · NWS gauge page
Gauge 111626182
No usual yet · Steady · water level 2.48 ft
Not forecast by NWS · NWS gauge page
Gauge 11162619
No usual yet · Steady · water level 1.11 ft
Not forecast by NWS · NWS gauge page
Gauge 11162620
No usual yet · Steady · water level 5.11 ft
Not forecast by NWS · NWS gauge page
Gauge 11162630
No usual yet · Steady · water level 2.82 ft
Not forecast by NWS · NWS gauge page
Gauge 11162735
No usual yet · Steady · water level -0.02 ft
Not forecast by NWS · NWS gauge page
2 more gauges
Gauge 11162737
No usual yet · Steady · water level 0.3 ft
Not forecast by NWS · NWS gauge page
Gauge 11162753
No usual yet · Steady · water level 4.14 ft
Not forecast by NWS · NWS gauge page

The level now against its usual for October (shaded, from USGS’s own record) and flood stage (red line). Not yet judged as unusual for here. Forecasts are the National Weather Service’s own, quoted.

Cameras

Public cameras in the county
Still from U.S. Geological Survey’s camera: San Andreas Lake A Dam nr Millbrae

Camera unavailable right now

San Andreas Lake A Dam nr MillbraeU.S. Geological Survey
Still from ALERTCalifornia, UC San Diego’s camera: Allen Peak

Camera unavailable right now

Allen PeakALERTCalifornia / UC San Diego
Still from ALERTCalifornia, UC San Diego’s camera: Cahill Ridge 1

Camera unavailable right now

Cahill Ridge 1ALERTCalifornia / UC San Diego
Still from ALERTCalifornia, UC San Diego’s camera: Cahill Ridge 2

Camera unavailable right now

Cahill Ridge 2ALERTCalifornia / UC San Diego
Still from ALERTCalifornia, UC San Diego’s camera: Castanea Ridge

Camera unavailable right now

Castanea RidgeALERTCalifornia / UC San Diego
Still from ALERTCalifornia, UC San Diego’s camera: Coll of San Mateo Bldg10

Camera unavailable right now

Coll of San Mateo Bldg10ALERTCalifornia / UC San Diego

78 more cameras

Stills are our copies, read from each camera’s owner while this page is open, with the owner’s credit. Cameras whose owners do not allow a copy are linked.

Events · No event in this county met our bar to publish in this window. · 3 reports held, not published; each links to why: 520847 516228 515269