scope:

Purpose.

To facilitate information on Department of Defense (DoD) and the National Weather Service (NWS) terminology and severe weather criteria used for determining and setting conditions of readiness for the Department of the Navy (DoN) activities and commands in advance of adverse or severe weather. This instruction is a complete revision and should be reviewed in its entirety. Summary of changes in this revision per subparagraphs 1a through 1e.

a. DoD deletion of tsunami and seiche warning.

b. NWS deletion of storm surge warning.

c. NWS addition of the following new terminology: Wind advisory, extreme wind advisory, winter weather advisory, winter storm advisory, blizzard warning, freeze watch and freeze warning.

d. NWS definition changes: Small craft advisory; hurricane force wind warning; tropical storm watch and warning; hurricane watch and warning; severe thunderstorm watch and warning; tornado watch and warning; winter storm watch and warning; flash flood watch and tsunami warning.

e. NWS terminology changes: Freezing precipitation advisory to freezing rain advisory; freezing precipitation warning to ice storm; coastal flood watch and warning to flood watch; flood warning; and flood advisory.