Winter Icing and Storms Project, 2004

A time-height (height in km above mean sea level) image of the GRIDS icing hazard product from the WISP04 research project. Green indicates safe conditions; yellow means that icing conditions are likely; the red areas are regions in which there is a definitive in-flight icing hazard. The black contour line is the cloud boundary as determined from the GRIDS radar. And the freezing level from the RUC (Rapid Update Cycle model; updated once per hour) is shown by the horizontal blue line. These results were confirmed by the UND (University of North Dakota) Citation research aircraft flying through the cloud.