Weather Word of the Day

July 22, 2019

Knots - The unit meteorologists use to measure winds speeds. Knots are the common unit pilots and sailors use when gauging wind speeds. A knot is based on nautical miles rather than statute miles. A wind speed of 1 knot is equal to 1.15 mph.

July 21, 2019

Winter Storm Advisory - Issued for conditions which warrants increased public awareness and moderately hamper travel, but the weather is not severe enough to merit a warning.

July 20, 2019

Wall Cloud - A localized, persistent, often abrupt lowering from a rain-free base. Many wall clouds exhibit rapid upward motion and rotation. However not all wall clouds rotate.

July 19, 2019

Dry Thunderstorm - Generally a high-based thunderstorm where lightning is observed, but little if any precipitation reaches the ground. Most of the rain produced by the thunderstorm evaporates into relatively dry air located beneath the storm cell. Dry thunderstorms are notorious for starting wildfires.

July 18, 2019

Latent Heat - The heat that is either absorbed or released when a substance undergoes a change of state. In weather, latent heat is an important factor when water changes state between liquid, solid, and vapor. For example, when water goes from vapor to liquid, latent heat is released into the atmosphere. The release of heat during condensation is one of the main energy sources for hurricanes.

July 17, 2019

Fog - Typically fog is composed of water droplets suspended in the air near the Earth's surface. When bitter cold temperatures are present, fog is composed of ice crystals instead of water droplets, and is called ice fog. Both types of fog reduce visibility at the surface.

July 16, 2019

Entrainment - The mixing of environmental air into a preexisting organized air current or cloud so that the environmental air becomes part of the air current or cloud. Cumulus clouds are subjected to the process of dry air entrainment on their outside edges. This is why cumulus clouds take on a lumpy and jagged form.