A function key is a key on a computer or terminal keyboard which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions, a form of soft key. On some keyboards/computers, function keys may have default actions, accessible on power-on.
Surge definition, a strong, wavelike, forward movement, rush, or sweep: the onward surge of an angry mob. See more.
Storm surge is the most deadly part of a hurricane or tropical storm. Be prepared -- during a storm surge event stay tuned to NOAA Weather Radio or television station and listen carefully for any advisories or specific instructions from local officials.