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 …

2018年3月1日 · It is a tool to be used for risk management and/or winter weather preparedness. 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.

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

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.

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.

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 …

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. [2][3] They are generally not violent storms but instead are commonly perceived as gentle rains occurring at temperatures just below freezing.

2024年11月18日 · The following charts depict in a 4-panel format the final forecast of the probabilities of snow reaching or exceeding 4, 8, and 12 inches and the probability of freezing rain reaching or exceeding 0.25 inch.

Detailed information on the U.S. National Ice Center's IMS daily snow and ice charts.