How to use the online alarm clock
If the evening downpour has left you halfway through something else, a 9:33 pm alarm marks the point to break off and check the river level. It is late enough for the rain to have changed what you saw earlier, yet still 27 minutes before 10:00 pm, so the reminder separates the check from the task already in hand.
Because the river check depends on noticing the alert promptly, silent mode deserves attention before you rely on it. The alarm may appear on screen without making a sound when your phone or computer is muted, so an audible setting and a beforehand volume check reduce that risk. The river check will receive no reminder if this page is no longer open or the phone or computer has gone to sleep.
Returning to the house after a 9:33 pm look can disturb people who have already settled for the evening. A coat, keys and torch placed near the door make the trip quieter, while a low alarm volume limits how far the sound carries through bedrooms. If someone else needs to know the reading, leaving a brief written note avoids a spoken update late at night.
Common questions
Can I change the sound?
Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.
Will it still be right when the clocks change?
Yes. It reads your device's local clock, so the move between GMT and BST at the end of March and October is picked up automatically, as long as the computer's date, time and time zone are set correctly.
Can I use this on a phone?
It works in a mobile browser, but phones lock the screen and suspend background tabs far more readily than a laptop does, which can stop the alarm sounding. For anything important, a desktop or a plugged-in laptop is the steadier option.
Does the alarm still work if I close the tab?
No. Everything runs inside this page, so closing the tab — or quitting the browser altogether — ends the countdown there and then. Leaving it open in the background is all it asks, and switching to another tab makes no difference.
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