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Storm cell and hail alerts in Home Assistant from RainViewer radar

Storm cell and hail alerts in Home Assistant from RainViewer radar

A hail storm over Sofia dented cars, flooded ground floors and wrecked gardens – damage that twenty minutes of warning would have prevented. A Python script decodes RainViewer radar tiles back into dBZ, tracks storm cells across frames and Home Assistant pushes a notification when hail or lightning is heading for the house or the car, with an ETA. Script and HA packages in a gist.