satellite imagery, including the location of the volcano, location/description of ash plume, forecast (at 6, 12 and 18 hours), and a graphic of the ash plume location/forecast. VAAs are issued by Volcanic Ash Advisory Centers in Anchorage (Alaska) and Washington (Contiguous United States, Caribbean, Central America, most of the North Pacific, and South America north of 10°S). VAAs are standardized worldwide by the International Civil Aviation Organization. Tropical weather Tropical storm warning (TRW) – Tropical storm conditions (gale- and storm-force sustained winds of ) are expected within the specified coastal or inland area within 36 hours (24 hours for Guam, as locally defined by the Barrigada-based WFO) in advance of the forecast onset of tropical-storm-force winds. These winds may be accompanied by storm surge, and coastal and/or river flooding. Tropical Storm Warnings may also be issued in association with a subtropical or post-tropical cyclone. Tropical storm watch (TRA) – Tropical storm conditions (gale- and storm-force sustained winds of ) are possible within the specified coastal or inland area within 48 hours in advance of the forecast onset of tropical-storm-force winds. These winds may be accompanied by storm surge, and coastal and/or river flooding. Tropical Storm Watches may also be issued in association with a subtropical or post-tropical cyclone. Hurricane warning (HUW) – Hurricane conditions (sustained winds of or greater) are expected within the specified coastal or inland area within 36 hours in advance of the forecast onset of tropical-storm-force winds. A Hurricane Warning can remain in effect if dangerously high storm surge, or a combination of dangerous storm surge and waves continue, even when winds fall below hurricane criteria. (This product is issued as a Typhoon Warning by the NWS Forecast Office in Barrigada, Guam, which uses a 24-hour maximum lead time before the onset of tropical-storm-force winds.) Hurricane watch (HUA) – Hurricane conditions (sustained winds of or greater) are possible within the specified coastal or inland area within 48 hours in advance of the forecast onset of tropical-storm-force winds. (This product is issued as a Typhoon Watch by the NWS Forecast Office in Barrigada, Guam and its partnering tropical weather forecasting agency, the Central Pacific Hurricane Center.) Hurricane local statement (HLS) – Issued by NWS Weather Forecast Offices for hurricane-threatened zones within the office's Warning Area, providing detailed weather conditions, evacuation decisions made by local law enforcement and emergency management agencies, and other necessary safety precautions for residents in