core/homeassistant/components/dwd_weather_warnings/icons.json

{
  "entity": {
    "sensor": {
      "current_warning_level": {
        "default": "mdi:close-octagon-outline"
      },
      "advance_warning_level": {
        "default": "mdi:close-octagon-outline"
      }
    }
  }
}