On the afternoon of 18 December 2008 severe icing conditions aloft were observed from several aircraft flying near Kotzebue. Four pilot reports (PIREPs) were called in between 2320 and 2332 UTC with descriptions of the icing ranging from moderate clear to severe rime. Observations showed conditions conducive to the formation of icing conditions from a collision-coalescence or "warm-rain" process. The surface observations and soundings from Kotzebue before and after the event showed a snow-producing cloud early in the day that transitioned to a cloud that was likely producing freezing drizzle and/or freezing rain. A version of FIP-Severity, based on NCEP's NAM and installed on the Interactive Correction in 4 Dimensions (IC4D) workstation at AAWU was used by forecasters to help determine the icing threat in the region. This version of the icing guidance did not capture the shallow, drizzle-producing cloud well. Its output will be compared to a developmental version of FIP-Severity being tested on the Rapid Refresh configuration of the Weather Research and Forecast model (WRF-RR) to determine if that model provides a better representation of the icing condition and, if not, what adjustments to the algorithm are needed to provide a better forecast.