This product is issued by the National Weather Service when high wind speeds may pose a hazard or is life threatening. The criteria for this warning varies from state to state. In Michigan, the criteria is sustained non-convective (not related to thunderstorms) winds greater than or equal to 40 mph lasting for one hour or longer, or winds greater than or equal to 58 mph for any duration.
A high wind warning is defined as 1-minute average surface winds of 35 kt (40 mph or 64 kph) or greater, or winds gusting to 50 kt (58 mph or 93 kph) or greater that are either expected or observed over land regardless of duration.
A warning for sustained surface winds greater than 40 mph lasting more than an hour or winds over 58 mph over land that are either predicted or occurring for an unspecified period of time.
Issued when sustained winds of 40 mph or greater are occurring or expected to persist for an hour or longer or if winds of 58 mph or greater are expected for any duration.
When high winds are imminent or occurring and are expected to continue for several hours, a high wind warning will be issued.
A high wind warning is defined as 1-minute average surface winds of 35 knots or greater (40 mph or greater) lasting for 1 hour or longer, or winds gusting to 50 knots or greater (58 mph or greater) regardless of duration that are either expected or observed over land.
A high wind warning is defined as 1-minute average surface winds of 35 kt (40 mph or 64 km/hr) or greater lasting for 1 hour or longer, or winds gusting to 50 kt (58 mph or 93 km/hr) or greater regardless of duration that are either expected or observed over land.