AccuWeather weather alarms are determined using the daily forecasts for a location. An alarm exists for a location if the forecast weather meets or exceeds the following thresholds:

Alarm Type Imperial Threshold Metric Threshold
Rain 0.5 inch 12.7 mm
Snow 1 inch 2.54 cm
Ice 0.1 inch 0.254 mm
Sustained Wind 30 mph 48 kph
Wind Gust 40 mph 64 kph
Thunderstorm Probability 75% 75%