Web alarm clock for 12:31 p.m.
As you hand the evacuation-centre headcount to the next volunteer at 12:31 pm, set the alarm to mark when the new person should confirm every name and area again. The 1:00 pm signal gives the handover a clear checkpoint instead of relying on someone to notice the clock while arrivals, departures, and questions continue around you.
A headcount can happen amid conversations, announcements, children, electric fans, and traffic outside, so choose a signal volume that can still be heard through that background noise. Keep the phone close to the person responsible and test the sound before you step away. This browser alarm will not sound if its page is closed or the phone goes to sleep, which could leave the evacuation-centre headcount without its reminder; keep the page open, the phone awake, and a separate backup if the checkpoint cannot be missed.
During a Philippine midday handover, place the record sheet and phone somewhere shaded but easy for the incoming volunteer to reach. Humid outdoor air can make papers curl or feel damp, while a breeze may lift loose pages, so use a clipboard and keep the name list covered between checks. That setup also lets the 1:00 pm headcount begin without searching for sheets moved away from the open-air entrance.