Alerts, the chime and snooze

Rain chime. When tracked rain is heading for your spot, the chime plays once when it’s predicted (typically 30–90 minutes out) and again when it’s about to arrive. Tap Snooze for 1, 2, 4 or 8 hours.

Lightning (Pro) chimes when strikes come within 10 miles, and again if they get closer.

Critical warnings always sound, snoozed or not: tornado, severe thunderstorm, flash flood, flood, hurricane, tropical storm, storm surge, extreme wind, tsunami, blizzard, ice storm, winter storm, extreme cold and avalanche warnings from the National Weather Service. Tap Acknowledge to silence the alarm; the warning stays on screen until it expires.

Spoken alerts. With Briefing → Speak alerts on, the app also says what’s happening (“Rain arriving in about 7 minutes”). Turn it off to keep just the chime.

Alerts with the screen off (Pro) come as push notifications from LeadTime’s server, which watches the radar for your last known position. Turn them on in Settings → Data → Turn on alerts for this device, then Send a test alert to check. On a phone, the app must be installed to the home screen first.