Web alarm clock for 1:23 p.m.
You are getting a cover ready at 1:23 pm, before the gathered coconuts need protection from a sudden tropical shower. Setting the alarm now leaves time to spread the tarpaulin, clear a dry spot, and check the pile rather than rushing when the sky darkens. The alert also keeps this preparation from slipping past 2:00 pm while other midday jobs compete for your attention.
Your coconut-covering reminder depends on the phone or computer staying awake until the chosen time. If it goes to sleep first, the alarm may not sound and the coconuts could remain exposed when rain arrives. Keep the browser running on an active device, raise the volume to a level you can hear outdoors, and leave the device near enough that the alert will not be missed over yard noise.
While arranging the coconut pile around midday, avoid moving repeatedly between strong air-conditioning and the outdoor heat. Gather the rope, tarpaulin, and weights indoors first, then carry them out together shortly before the alarm. At 1:23 pm, shade can make the remaining preparation more comfortable; keep the cover folded nearby so it can be pulled across quickly without a long search under the afternoon sun.