Web alarm clock for 4:49 a.m.
As you finish securing the windows before the typhoon arrives, set the alarm for 4:49 am so you can leave the room without losing track of the final check. By 5:00 am, you may already need to be in a safer part of the house, away from the glass. Use these minutes to test each latch, draw the curtains, and move loose objects from the sill.
Your window check needs an alert you can actually hear over rain, wind, or activity elsewhere in the home. Before walking away, play a quick test and check whether the sound has quietly been routed to wireless or wired headphones. If it has, disconnect them or place them where you will hear them. Keep this browser alarm active and the phone or laptop awake; otherwise, the window task may pass without any sound.
Because 4:49 am is still night in the Philippines, indoor and outdoor areas may be too dim for you to spot a loose latch or a narrow gap. Switch on the room light before the check, and prepare a torch in case the electricity goes out. Aim the beam along window edges rather than toward the glass, where reflections can hide details. Leave the torch beside you when you move to your safer place.