Ice storm

From Simple English Wikipedia, the free encyclopedia

Ice storms are weather phenomena caused by freezing rain. The falling rain comes into contact with surfaces and turns into a thin sheet of ice. Ice storms cause accidents, take power lines down and cause serious damage.

Formation[change | change source]

A graph showing the formation of different kinds of precipitation.

It starts with a layer of warmer (not freezing) air above a layer of huge-freezing temperatures lower down. Frozen precipitation melts to rain while falling into the warm air layer, and then begins to refreeze in the cold layer below.

  1. If the precipitate refreezes while still in the air, it will land on the ground as sleet.
  2. Or, the liquid droplets continue to fall without freezing. They pass through the cold air just above the surface. This thin layer of air cools the rain to a temperature below freezing (0 °C or 32 °F), but the drops themselves do not freeze. This is a phenomenon called supercooling.
    When the supercooled drops strike ground or anything else below 0 °C (32 °F) (e.g. power lines, tree branches, aircraft), a layer of ice builds up, hence "freezing rain".[1][2][3]

Reeferences[change | change source]

  1. Gay, David A.; Robert E. Davis (December 30, 1993). "Freezing rain and sleet climatology of the southeastern USA" (PDF). Climate Research. 3 (1): 209–220. Bibcode:1993ClRes...3..209G. doi:10.3354/cr003209.
  2. "Ice Storms". City of Savannah, Georgia. Archived from the original on July 28, 2007. Retrieved January 8, 2009.
  3. University of Illinois. "Cyclones and Fronts: the definition of freezing rain". Archived from the original on January 22, 2009. Retrieved January 9, 2009.