An Ice Storm is a freezing rain situation (rain that freezes on surface contact) with significant ice accumulations of 0.25 inches or greater. In the National Risk Index, an Ice Storm Risk Index score and rating represent a community's relative risk for …

Mar 1, 2018 · The SPIA® Index is to ice storms what the Enhanced Fujita Scale is to tornadoes, and what the Saffir–Simpson Scale is to hurricanes.

Ice storms are extremely difficult to forecast - a slight difference in the track of a storm system can cause dramatic changes in forecasted precipitation amounts and precipitation type. Please listen for updated forecasts before and during the event.

Feb 4, 2025 · Forecasts anticipate that an ice storm will hit the Midwest and Northeast by mid-week, with at least six states expecting a high chance of impacts. Widespread freezing rain is expected to bring...

The Sperry–Piltz Ice Accumulation Index, or SPIA Index, is a scale for rating ice storm intensity, based on the expected footprint of an ice storm, the expected ice accumulation as a result of a storm, and the expected damage a storm inflicts on human-built structures, especially exposed overhead utility systems such as power lines.

Custom plots of Local Storm Reports across the Contiguous United States. Reports include rain, snow, ice, and severe weather, as well as other significant information from storm spotters.

The Sperry–Piltz Ice Accumulation Index, or SPIA Index ®, is a forward-looking, ice accumulation and ice damage prediction index. When used in conjunction with National Weather Service forecast data, it has been shown to accurately predict the duration, intensity and damage capability of approaching ice storms.

An ice storm, also known as a glaze event or a silver storm, is a type of winter storm characterized by freezing rain. [1] The U.S. National Weather Service defines an ice storm as a storm which results in the accumulation of at least 0.25-inch (6.4 mm) of ice on exposed surfaces.

U.S. National Ice Center's Interactive Multisensor Snow and Ice Mapping System (IMS) daily snow and ice charts for the Northern Hemisphere.

Ice Accumulation: Potential impact from the ice accumulation and wind. Flash Freeze: Potential impact from rapid decreases in temperature from above to below freezing with the presence of liquid water. Blowing Snow: Potential impact from falling snow combined with wind.