Enroute Icing

### Produced by The COMET® Program

### Step 1: Diagnosing Locations of Icing » PIREPs and AIREPs » Data

These PIREPs go from 1000 through 1300 UTC 26 February 2011, with the red lines marking the boundaries of the service area. Green represents light icing, and gold indicates moderate icing. The number adjacent to the report gives the observation flight level in hundreds of feet.

#### Question

Based on the information plotted, what conclusions can you draw about the validity of this icing data in and upstream of the Chicago CWSU service area?

a) The PIREPs are valid because they are similar in intensity to each other
b) The PIREPs are suspect because they are similar in intensity but dissimilar in flight level
c) The PIREPs are valid because they are at similar flight levels
d) The PIREPs are suspect because they are similar in flight level but dissimilar in intensity

The correct answers are a, c.

All PIREPs for icing near the service area indicate light to mostly moderate icing between flight levels 016 and 075.

Please make a selection.