Web alarm clock for 1:11 p.m.
Before handing shutter duty to the next person, set the alarm for 1:11 pm so the midday downpour does not catch an open window unattended. Say which shutters still need closing and where the latches stick, then leave the phone within hearing range. The alert also gives your replacement a clear checkpoint before 2:00 pm, when the rain may have shifted but splashes can still reach the sill.
Because the shutter handover depends on a browser alarm, keep this page open after setting it. Closing the tab or browser ends the alarm, and a sleeping phone or laptop may prevent any sound, leaving the shutters unchecked when the shower strengthens. Confirm that the displayed time is 1:11 pm, raise the volume, and keep the screen awake if you are relying on this alert rather than another clock.
For a shutter changeover around midday in the Philippines, check the air outside from a covered spot before deciding how tightly to close everything. Humid air can remain heavy even when the rainfall briefly eases, so leave only a safely sheltered gap if the room needs airflow. Keep loose curtains away from that opening, watch which direction the rain is blowing, and tell the next person exactly which window can be adjusted without letting spray indoors.