This webpage provides 24-hour real-time information on weather and sea conditions such as water levels observed in Tokyo, live images of the sea surface, and the open/closed status of floodgates.
Check the water level and the open/closed status of the floodgates for the citizens of Tokyo, and use them for quick evacuation actions during storm surges caused by typhoons.
[Copyright Protection]
Numerical data, simple tables, graphs, and floodgate image screens are not subject to copyright and can be used freely. However, the sources should be included when using the content.
When editing and processing the content, etc., in addition to including the above sources, it should be stated that the content has been edited and processed, etc. In addition, the edited and processed information should not be published or used as if it were created by the city.
[Notes on Use]
Information may not be displayed or abnormal values may be displayed during maintenance or malfunction of observation equipment.
Information distribution may be changed, interrupted, or canceled without prior notice to users due to circumstances beyond the control of the administrator.
The Tokyo Metropolitan Government is not responsible for any action (including information in which content is edited and processed etc.) is performed using the content.
In the event of a disaster, also check the disaster prevention weather information released by the Japan Meteorological Agency and the evacuation information released by the ward (basic municipality).
[Screen Display]
This webpage uses JavaScript. JavaScript should be enabled.
A screen size having 1,366 horizontal pixels or more, and Firefox 63 or higher, Safari 12 or higher, Google Chrome 63 or higher, Microsoft Edge 42 or higher are recommended.
The screen display may be distorted depending on the display driver or browser being used.
Information will be updated automatically every 5 minutes. To stop automatic update, click the "Automatic Update OFF" button.
[Top Page]
When a Storm Surge Advisory, Warning, Emergency Warning, or Storm Surge Inundation Information is issued, the information is displayed at the top of the screen.
The map of observation points shows the locations of floodgates and sea surface live cameras that observe tidal levels, etc., on the map using symbols.
Click the "Observation Status/Floodgate Status" tab to display a symbol indicating the open/closed status of each floodgate on the map.
The open/closed status of the floodgates can be checked by clicking on a symbol of a floodgate to move to a detailed screen of the observed values at the observation point.
Click on the "sea surface live camera" tab to display the symbols on the map of points where the sea surface live cameras are installed.
Click a sea surface live camera symbol to display the page showing the image of the sea surface live camera.
In the list of observed values, the values observed at each floodgate are displayed. Click the ward name to display the floodgates (observation points) in that ward.
At the bottom of the screen, the real-time water level of reference observatory for the Storm Surge Emergency Warning Water Level and the arrival status of the Storm Surge Emergency Warning Water Level are shown in a table.
It is possible to move to the "Storm Surge Disaster Prevention Learning Content Page (Let's Know and Learn About Storm Surge Disaster Prevention)" and to the "Past Data Download Page (PC only)" from the bottom of the link collection.
[Detailed Page of Observed Values]
The open/closed status of the gates of each floodgate is displayed as an illustration.
This displays the real-time observation values of each observation point and the open/closed status of each floodgate.
Note that if no observation equipment is installed, the observation values will not be displayed.
In the 1-hour display on the initial screen of the tide level graph, the history of the past 24 hours from the display time is displayed.
If you select "10 min" on the tide level graph, the history of the past 4 hours from the display time will be displayed.
In the 1-hour display on the initial screen of the wind direction/wind speed graph, the history of the past 24 hours from the display time.
If you select "10 min" on the wind direction/wind speed graph, the history of the past 4 hours from the display time will be displayed.
In the 1-hour display on the initial screen of the atmospheric pressure graph, the history of the past 24 hours from the display time is displayed.
If you select "10 min" on the atmospheric pressure graph, the history of the past 4 hours from the display time will be displayed.
[Sea Surface Live Camera Screen]
On the sea surface live camera screen, a still image from the live camera is displayed every 5 minutes.
On the sea surface live camera screen, images for the past 24 hours can be selected and displayed by button operation, etc., and if the current image is displayed, it is automatically updated every 5 minutes.
Click on "Click Here for the Video Distribution Page" to link to the dedicated YouTube channel and watch the live video.
The image range and image position of the live camera are subject to change due to equipment inspections and flood control activities.
This site collects certain information using cookies and similar technologies in order to improve user convenience and to improve the site.
[What are Cookies and Similar Technologies?]
Cookies are data sent from a website and stored on a device as a tag to identify the device when a user accesses the website using the device.
By using cookies, information such as the number of visits to websites by your device and sites other than websites that you have visited in the past can be obtained.
As shown below, it is also possible for a user to disable the functions of cookies and similar technologies by setting the browser.
[Tools Used, Information Acquired and Purpose of Use]
The tools used on this site, the information acquired by using the tools, and the purpose of use are as follows.
＜Google Analytics＞
Tool Provider: Google Inc.
Information to be acquired: Usage status of the website (access status, traffic, routing, etc.)
Purpose of use: For improving user convenience and the website.
Google will also acquire and use the usage status of the website.
For details refer to the URLs below.
[How to Delete/Disable Cookies and Similar Technologies]
(1) Method for Removing All Cookies
Cookies that are stored on a user's device will continue to be stored until the user intentionally deletes them or the respective expiration date expires.
Most popular browsers have cookies acceptance enabled by default, however, cookies can be deleted on your browser.
For details on how to delete Cookies on each browser, refer to the following links.
(2) Setting Method for Disabling/Enabling Cookies
For the following cookies, disabling/enabling cookies can be set with the following buttons.
Google Analytics: Website usage analysis tool
(3) Google Analytics Opt-out Add-on
Google Analytics tracking can be denied using the Google Analytics opt-out add-on.
The Google Analytics opt-out add-on is a feature developed to allow website users to disable the use of data by JavaScript. To take advantage of this feature, download this add-on and install it on the browser being used.
Make inquiries regarding this site to:
Planning Section, Port Planning and Construction Division, Bureau of Port and Harbor, Tokyo Metropolitan Government Tel: 03-5320-5622
Tokyo Storm Surge Disaster Prevention Information System