ADDS - Aviation Digital Data Service

ADDS - Icing Help Page (1 of 4)
Back to Icing Page or Icing help page 2

The Current Icing Product (CIP) and Forecast Icing Potential (FIP) are computer-generated three-dimensional analyses of information related to the likelihood of encountering icing conditions. This information is available for the 48 contiguous United States, much of Canada and Mexico, and their respective coastal waters.

The CIP/FIP graphics suite is automatically produced with no human modifications. Information on the graphics is determined from observational data including WSR-88D radar, satellite, pilot weather reports, surface weather reports, lightning and Numerical Weather Prediction model output.

CIP/FIP graphics may be used as a higher-resolution supplement to AIRMETs and SIGMETs, but not as a substitute for the icing severity and other information they provide. CIP/FIP are authorized for use as an unrestricted, supplementary weather product. See Help Page 4 for a definition of these terms.

The Icing Page contains 4 major sections:
  • The first section contains a thumbnail of the current icing AIRMETs in dashed blue lines and SIGMETs (if any) in solid red lines. Clicking on the thumbnail image will produce a larger view.
  • The latest voice PIlot REPorts (PIREPs) of icing are available in the second section and can be obtained by clicking on the desired map region. These images are updated about every 15 minutes and depict location and severity of aircraft icing as reported by pilots.
  • The third section contains a link to CIP/FIP icing products. The Current Icing Product (CIP) represents the latest analysis of potential icing regions. Besides the most-recent analyses, a forecast of anticipated icing conditions is available in the Forecast Icing Potential (FIP) product.
  • The last section contains links to graphics depicting the height of the lowest freezing level. The colors represent the height in hundreds of feet above mean sea level (MSL) of the lowest freezing level. Regions in white indicate that the surface and the entire depth of the atmosphere are below freezing. Hatched regions (if present) represent areas with multiple freezing levels and a more detailed graphical description is available.