Transient

{ˈtran-zē-ənt}

Adjective

1.lasting only for a short time; impermanent.

noun

1. person who is staying or working in a place for only a short time.
2. momentary variation in current, voltage, or frequency

Examples of transient in a sentence:

• The snow is transient and will melt as soon as the sun appears.
• The transient storm passed through our town rather quickly.