• Flash Flood Warning Warns of a rapidly developing flooding occurring within 6 hours of the causative event. [FFW]
• Flash Flood Statement Provides information that supplements earlier Flash Flood Warning. [FFS]
• Flood Watch Identifies areas where there is a risk of flooding, but flooding is not certain. [FFA]
• Flood Warning Warns of floods developing more than 6 hours after causative event. May provide information on forecast stream levels and describe impacts of past flooding at forecast levels. [FLW]
• Flood Statement Updates or expands information in previously issued Flood Warning. [FLS]

(information from the site)