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Aviation Decision Support. InFlight and Ground Icing: what do I need to know? Marcia Politovich , NCAR Flight Planning: Where is it? Along my planned route of flight? What altitude? Do I need to de-ice prior to takeoff? Is there freezing precipitation at my destination? When is it?

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aviation decision support
Aviation Decision Support

InFlight and Ground Icing: what do I need to know?

Marcia Politovich, NCAR

  • Flight Planning:
    • Where is it?
      • Along my planned route of flight?
      • What altitude?
      • Do I need to de-ice prior to takeoff?
      • Is there freezing precipitation at my destination?
    • When is it?
      • How long will the inflight or ground icing condition continue?
      • Should I delay my flight until the weather improves?
    • How bad will it be?
      • What’s the forecast severity?
      • How does that affect my airplane?
  • During Flight:
    • Have conditions changed?
    • Do I need to request change of flight route, altitude?
    • Do I need to divert to an alternate airport?
how do we find this info
How Do We Find This Info?

less

What are we looking for?

Information sources

Satellite – horizontal extent of clouds, cloud top temperature, what type of cloud

PIREPs – where icing is and is not

METARs – precipitation type and amount, cloud cover, ceiling height, cloud layers

Radar – extent of precipitation

Soundings – temperature and moisture profiles at a point

Models – full temperature field, humidity, condensate

  • Clouds or precipitation
  • -40C<T<0C
  • Supercooled liquid water
  • Narrower T range
  • Glaciation
  • LWC
  • Drop size

more

products that can help
Products That Can Help

InFlight icing:

  • AIRMETs and SIGMETS
    • National Weather Service forecasts of expected moderate or greater icing over large areas for 6-h periods
  • SIGMETS
    • National Weather Service forecasts of severe icing – short term, small area, usually triggered by a pilot reporting severe icing conditions
  • CIP and FIP
    • Automated diagnoses and forecasts of icing including probability, expected severity, and potential for large-drop icing
    • Hourly out to 12 h, with 20-km/1000-ft resolution
  • TAFs
    • Show forecast conditions at airports
  • Various vendor products
    • These supplement the products above with different displays and content, and can be free to the public or available via a subscription service
your web resources
Your Web Resources
  • NCAR Research Application Lab, Aviation Applications Program
  • http://www.ral.ucar.edu/aap/
  • Aviation Digital Data System – ADDS

Your one-stop-shopping place for AIRMETS, SIGMETS, surface conditions, TAFS, and automated CIP/FIP guidance over the CONUS

    • Operational: http://www.aviationweather.adds.gov/adds/
    • Experimental: http://weather.aero/
  • Aviation Weather Center: http://www.aviationweather.gov/
      • Additional products generated by NWS
  • Alaska Aviation Weather Unit: http://aawu.arh.noaa.gov/
      • Provides AIRMETS and SIGMETS for Alaska