Precipitation types the preceding adjective "freezing", becoming known as freezing rain or freezing drizzle. Frozen forms of precipitation include snow, ice needles, sleet, hail, and graupel. Their respective intensities are classified either by rate of fall, or by visibility restriction. Precipitation falls in many forms, or phases. They can be subdivided into: The parenthesized letters are the METAR codes for each phenomenon. Precipitation occurs when local air becomes saturated with water vapor, and can no longer maintain the level of water vapor in gaseous form. This occurs when less dense moist air cools, usually when an airmass rises through the atmosphere. However,
Wilkes County, North Carolina spring and summer months; and rain, snow, sleet, and freezing rain all occur at times during the winter, with the frequency increasing with the altitude. Severe weather is not common in Wilkes but does occur. Tornadoes are rare, but severe thunderstorms can bring strong winds which can down trees and power lines, as well as cause hail. In October 2017, a rare EF 1 tornado touched down in the towns of Wilkesboro and North Wilkesboro, and then moved through the Mulberry, Fairplains, and Hays communities, causing significant damage. Wilkes County is far enough inland that hurricanes rarely cause problems, but