Moon phase compatibility is a TikTok trend in which two people look up the lunar phase on their birthdays and...

The far side of the moon is the hemisphere humans never saw with our own eyes until December 1968. It...

The right indoor relative humidity sits between 30 and 50 percent, per EPA and ASHRAE consensus. That single window covers...

An atmospheric river is a long, narrow corridor of concentrated water vapor that moves through the atmosphere like a river...

The Saffir-Simpson Hurricane Scale is the 1-to-5 ranking that puts a number on a hurricane's wind damage potential. It is...

Soil temperature is the number that decides whether a seed will germinate or rot. Air temperature gets the headline forecast,...

Humidity is water vapor in the air. You cannot see it; humidity is the gaseous form of water, distinct from...

A blood moon is a total lunar eclipse seen from the night side of Earth, when the Moon passes through...

The polar vortex is not a winter storm. It is a permanent feature of the polar atmosphere, a circulation of...

An aurora forecast tells you whether the northern lights will reach your latitude tonight. The system is built on solar...