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SLEET SOUNDING

  • Temperatures are below freezing in the lowest portion of troposphere while there is a layer just above freezing above the below freezing layer. Precipitation falls as snow aloft, then partial melts as it falls through the layer that is just above freezing, then refreezes in the subfreezing layer before reaching the surface.
  • Sleet commonly occurs with a wintry mix of snow, freezing rain and/or rain
  • Sleet may change over to snow through evaporative cooling or cold air advection. Rain may change to sleet through cooling processes in the lower troposphere.
  • Forecast sleet using the thickness values: http://www.theweatherprediction.com/winterwx/thicknesscriteria/.

  • EXAMPLE:
    [ Sleet Sounding ]