E

Early – until two hours after sunrise.

El Niño – a major warming of the equatorial waters in the eastern Pacific Ocean. El Niño events usually occur every three to seven years, and are related to shifts in global weather patterns. (Spanish for the "Christ Child” because it often begins around Christmas.)

Evaporation – the process of a liquid changing into a vapor or gas.

Evening – sunset to midnight.

Extended outlook– a basic forecast of general weather conditions three to five days in the future.

Extratropical cyclone – a storm that forms outside the tropics, sometimes as a tropical storm or hurricane changes. See table below for differences between extratropical and tropical cyclones.