noun
general weather conditions
A somewhat formal or technical term used in weather reports and forecasts to summarize the overall weather situation.
天気概況によると、明日は全国的に雨になる見込みです。
According to the general weather conditions, rain is expected nationwide tomorrow.
天気予報 is the common term for 'weather forecast', while 天気概況 is a more specific, technical term for the overall weather summary.
Compound of 天気 (weather) and 概況 (general conditions).