What this site actually does with data, in plain terms, rather than a link out to somebody else's general policy.
Google Analytics 4 is used to see which pages are useful and where the site is slow: page views, roughly which country a visit came from, device and browser type, and which page led to the next. It runs only once analytics cookies are accepted, which is covered under "Change your choice" below.
Nothing in that data identifies a visitor by name, and it is not linked to the optional accounts described below.
An account is optional and only needed for alarms. Sign-in is handled by Google Firebase Authentication, which stores your email address, an account ID, and your name if you sign in with Google. Passwords are held by Firebase and never reach this site.
Your email address is used to sign you in, to verify it, and to send the alarms you set up. It is not used for anything else or shared.
You can also choose to tell the site about your role, the places you cover, what you act on and how you like forecasts put. These answers are optional, are stored privately against your account, can be viewed, changed or cleared at any time in your profile, and are used only to shape Bert's replies. When you use the chat they are sent with your question to the service that writes the answer.
Pages carry a "Chat to Bert" button for questions about the data on that page, or about rain, rivers, warnings and forecasts more widely. It is available to invited accounts only, and needs a signed-in, verified account.
Each question, the answer, and a short description of what was on screen (for example the time or gauge selected) are sent to OpenAI to produce the answer. They are kept with your account's email address in a private location for 90 days so answers can be reviewed and improved, and then deleted. People may read them for that purpose, so please do not put personal or sensitive information in a question. They are not used for anything else or shared.
If you mark an answer as useful or not useful, or leave a comment on it, that is kept with the question, the answer and your email address in the same private location, so answers can be improved. It is not shared.
The feedback survey is a separate, deliberately anonymous flow: no IP address, no browser fingerprint, no identifier of any kind is stored with a response. There is an optional email box for anyone who would like a reply; it is only used to reply about that response, and left blank the response stays anonymous. Answers are stored in a private location with no public link, readable only with the site's own maintenance key.
The analytics choice made on first visit is remembered in this browser only. To change it at any time:
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The address of the Model Viewer and Model Multi now follows what is on screen: the layer, Areas, isobars, temperature values, split screen and the rest. Bookmark it, or save it as a shortcut, and it opens the same view at the latest run. For a quick link to one parameter, add ?param=rain (or temp, cloud, wind) to the address.
Open PrecipitationThe Cloud layer now shows white cloud over a darker map, so it stands out clearly, and you can switch between Total, High, Mid and Low cloud to see which layer of the atmosphere the cloud is in. It works on every model on the Model Viewer and Model Multi.
Open low cloud
Temperature on the Model Viewer is now drawn in 3 degree colour bands, and a new Anomaly layer shows how far each model's 2 m temperature is above or below the normal for that date and hour, against 1990 to 2019 (set to the Met Office's 1991 to 2020 averages over the UK), in blue to red bands. Turn on Show temperature values in the settings menu to print the numbers on the map. Tap Space to flip between temperature and anomaly, or hold it to peek. The Split screen switch on the bar shows temperature on the left and its anomaly on the right.
Open the anomaly
This application brings together real-time data from multiple sources to help you stay informed about weather and flood conditions across the UK.
Important
This application is unofficial and provided for informational, research, and analysis purposes only. Uptime, data completeness, and real-time accuracy are not guaranteed.
To avoid over-reliance during active weather or flood events, do not make safety-critical decisions using this tool. For official warnings and instructions, consult the primary public services directly: