High Ice Water Content (HIWC) charts highlight areas with a high concentration of ice crystals at 500 millibars (18,000 feet), represented by red dots. These areas pose an increased risk of ice crystal engine icing events. The charts are available under the Imagery tab in ForeFlight Mobile and ForeFlight on the Web for four global regions: Americas, Atlantic, Pacific, and Asia. Updates occur approximately every 30 minutes.
High Ice Water Content (HIWC) Chart in ForeFlight Mobile
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