Frost, lightning, hail and snow melting, which one does not belong to the weather forecast?

Thunderstorm, autumn wind and hail are all climatic phenomena and meteorological terms. Only "frost" is a meteorological disaster, not a meteorological term, but a natural disaster term, which is different from the other three words. Weather: sunny, cloudy, cloudy, showers, thunderstorms, thunderstorms accompanied by hail, sleet, light rain, moderate rain, heavy rain, heavy rain, heavy rain, heavy rain, snow showers and light snow.