The weather watches alerts viewers that conditions are favorable for the development of severe weather. The issue time will be up to 24 hours before expected events.
A weather warning means that severe weather is occurring, imminent, or likely in the location indicated and is a threat to life and property. The issue time will be up to 6 hours before severe weather events.
The code denoting the urgency of the subject event of the alert message.
Responsive action SHOULD be taken immediately.
Responsive action SHOULD be taken soon (within next hour).
Responsive action SHOULD be taken in the near future.
The code denoting the severity of the subject event of the alert message.
Extraordinary threat to life or property.
Significant threat to life or property.
Possible threat to life or property.
Minimal to no known threat to life or property.
The code denoting the certainty of the subject event of the alert message.
Determined to have occurred or to be ongoing.
Likely (probability greater than 50%).
Possible but not likely (probability less than/equal to 50%).
Not expected to occur (probability equals to 0%).