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For the immediate Hawai`i area, products issued are Terminal Aerodrome Forecasts (TAFs), area forecasts, upper level wind and temperature forecasts, and AIRMETs (AIR pilots METeorological information) for low clouds, turbulence, and icing. In addition, the Honolulu forecast office is an aviation Meteorological Watch Office that covers approximately 8,650,800 square miles. See Aviation Area Map.

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Aviation section from the Area Forecast Discussion
issued at: May 21, 2018 9:41 AM HST

Moderate lower level NE trades are still in place with slight weakening into Tuesday as the high centered at 31N141W weakens and the pressure gradient loosens. Will continue AIRMET Tango for low-level turb probably through the end of this period. Otherwise it is a relatively stable pattern in place through the period with intermittent interruptions on Kauai and windward Big Island. Periodic lower ceilings possible in those locations with a few showers resulting in MVFR conditions for ceilings.

Periodic explosive eruptions at Kilauea/Halemaumau crater continue to produce periods of volcanic ash with a plume of emissions extending to the west and southwest over the Kau District. There was a brief ash plume just before 100 AM HST this morning, while a more continuous ash plume became evident starting around 200 AM HST. Volcanic ash SIGMET TANGO remains in place at this time.

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