Web alarm clock for 10:30 a.m.
You are preparing ahead at 10:30 am, setting aside time to clear the storm-drain grate before the forecast rain reaches your area. An alarm leaves you a defined window for gloves, a sack, and the clearing itself, rather than letting the chore slip while you handle other morning tasks. With 11:00 am as your marker, you can finish before the next part of your day begins.
Your storm-drain check should not depend on a sound you have never tested. Set a brief trial alarm first, keep the volume high enough to hear from where you will be working, and confirm that the tone plays through the speaker you expect. A browser alarm cannot alert you if the page is no longer running or the phone goes to sleep, so your storm-drain clearing could start late; keep the page active and the phone awake until it rings.
Before leaving to clear the grate, allow for late-morning traffic on nearby barangay roads, especially around schools, markets, and jeepney stops. A short trip can take longer as 11:00 am approaches, so include travel time in your plan and bring the tools in one trip. If the drain is along a busy road, arriving with everything ready also limits how long you spend beside passing vehicles.