Enroute Icing

### Produced by The COMET® Program

### Step 1: Diagnosing Locations of Icing » Skew-T/Log-P » Data

#### Question

Here’s the Skew-T sounding for Davenport, IA for 12 UTC 26 February 2011. Review it, looking for layers that may contain supercooled water and features that may indicate enhance chances of severe icing. Then use the drawing tools to outline the areas that are at risk for icing. (Click if you'd like to review the Icing Flowchart.)

Use the black pen to circle any layers that may contain supercooled water. Use the red pen to circle any features that may indicate enhanced chances of moderate to severe icing.

Tool: | Tool Size: | Color:
--- | --- | ---
Pen Eraser |  |

The entire layer from 720 hPa to the surface has temperatures from about -13°C to -8°C, and dew point depressions from 0° to 2°C. This layer, circled in black, has conditions that are favorable for icing throughout its 280 hPa depth. Within this deep layer is a conditionally unstable layer between about 730 and 780 hPa circled in red (between FL070 to FL090), in which icing could be further enhanced by convective motion.

Also note the west to west-southwest winds from 800 to 350 hPa in the sounding (FL065 to FL260). These conditions are being advected eastward from Iowa into the service area.