
Jody Victor : Definitions Of Weather
by
Jody Victor
on Thu 13 Dec 2007 11:16 AM EST
Jody Victor: When I was a kid, I remember hoping it would snow - a lot - so we could stay home an play in it. But now, as an adult, I still like the beautiful picture a snow covered yard and road can be, but I can't say I like driving in it. To better understand those early morning weather predictions, here are some definitions to get your day started.
Sleet: Precipitation of small, partially melted grains of ice. Sleet occurs only during the winter, while hail, a different form of icy precipitation, may fall at any time of the year.
Freezing Rain: Precipitation that begins as snow falling from a cloud towards earth. It melts completely on its way down through a layer of warm (above freezing) air and then supercools in a small layer of cold air just before it impacts the surface. Due to being supercooled the water freezes again upon impact.
Hail: Precipitation composed of chunks or lumps of ice formed in strong updrafts in cumulonimbus clouds. Individual lumps are called hailstones. Most hailstones are spherical or oblong, some are conical, and some are bumpy and irregular.
Snowflake: Formed when water vapor turns to ice crystals either in the clouds or on the way down to Earth.
Winter Storm Watch: Issued under changing weather conditions, when the specific timing, location, and path of an approaching or forming storm are undetermined.
Winter Storm Warning: Issued when more than 6 inches of snow, a significant ice accumulation, or a dangerous windchill (or any combination of the three) is expected within 24 hours.
Blizzard Warning: Issued when sustained winds of 35 miles per hour or greater, in combination with considerable snowfall and poor vivibility is expected for three hours or more.
Northeaster (aka Nor'easter): A storm that typically produces heavy snow and rain and generates large waves in the Atlantic coastal regions, often causing beach erosion and structural damage to buildings. Wind gusts can exceed hurricane speeds.
Be careful driving in any inclement weather.
Jody Victor