NORFOLK, Va. — Technically called “cumulonimbus flammagenitus,” pyrocumulonimbus clouds are a rare weather phenomenon caused by intense heat. These towering clouds form when extreme heat ...

Sometimes, though, it can be as simple as going outside because a lot can be learned by just ... nimbostratus, and cumulonimbus clouds (with “nimbus” meaning precipitation in Latin).

A lot of vapor delays the radio waves that ... over Kyushu in July last year accurately shows developed cumulonimbus rain cloud bands. The Meteorological Agency issues alerts in each prefecture ...