Wind Information Page. A Wind Advisory means that sustained winds of 30 mph for one hour and/or frequent gusts of at least 45 mph are occurring or expected within the next 36 hours. These winds will make it difficult to drive high profile vehicles. ... Winds this strong may damage trees, power lines and small structures.

Can 30 mph winds knock down a tree?

Critical wind speeds, in which no tree can withstand punishment for any continuous length of time, is around 90 mph. The breaking phenomenon of critical wind speed is mostly independent of the tree's diameter, height or elastic properties.

Can you take off in 30 mph winds?

With this in mind, horizontal winds (also known as “crosswinds”) in excess of 30-35 kts (about 34-40 mph) are generally prohibitive of take-off and landing. ... If crosswinds are strong while the plane is at the gate, air traffic controllers maybe simply delay departure, as they would during heavy snow.