"dry lightning" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "dry lightning (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Lightning",
          "orig": "en:Lightning",
          "parents": [
            "Electricity",
            "Weather",
            "Electromagnetism",
            "Atmosphere",
            "Physics",
            "Nature",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "heat lightning"
        }
      ],
      "glosses": [
        "Lightning strikes that occur when there is no rain, thus a common cause of bushfires or forest fires."
      ],
      "id": "en-dry_lightning-en-noun-od~vFctK",
      "links": [
        [
          "Lightning",
          "lightning"
        ],
        [
          "strike",
          "strike"
        ],
        [
          "rain",
          "rain"
        ],
        [
          "bushfire",
          "bushfire"
        ],
        [
          "forest fire",
          "forest fire"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "dry lightning"
}

{
  "coordinate_terms": [
    {
      "word": "heat lightning"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "dry lightning (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Lightning"
      ],
      "glosses": [
        "Lightning strikes that occur when there is no rain, thus a common cause of bushfires or forest fires."
      ],
      "links": [
        [
          "Lightning",
          "lightning"
        ],
        [
          "strike",
          "strike"
        ],
        [
          "rain",
          "rain"
        ],
        [
          "bushfire",
          "bushfire"
        ],
        [
          "forest fire",
          "forest fire"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "dry lightning"
}