weather map
A map showing meteorological data such as pressure systems, fronts, and isobars, used in weather forecasting.
天気図を見ると、明日は雨が降りそうだ。
Looking at the weather map, it looks like it will rain tomorrow.
upper-level weather chart
Compound of 天気 (tenki, 'weather') and 図 (zu, 'map, chart').