Garmin GPSMAP 8530 Black Box Owner's Manual - Page 26

the last seven minutes. The ground-based lightning detection network detects cloud-to-ground lightning only. Hurricane Information The weather Precipitation chart can show the present position of a hurricane , a tropical storm, or a tropical depression. A red line stemming from a hurricane icon indicates the projected path of the hurricane. Darkened dots on the red line indicate the projected locations through which the hurricane will pass, as received from the weather data provider. Weather Warnings and Weather Bulletins When a marine weather warning, weather watch, weather advisory, weather bulletin, or other weather statement is issued, shading indicates the area to which the information applies. The aqua lines on the chart indicate the boundaries of marine forecasts, coastal forecasts, and offshore forecasts. Weather bulletins may consist of either weather watches or weather advisories. To view information about the warning or bulletin, select the shaded area. Color Marine Weather Weather Subcategories Group Light Blue Flash Flood Dark Blue Flood Areal Flood, Coastal Flood, Debris Flow, Flood, High Water Level, Hydrological, Lakeshore Flood, Storm Surge Yellow Marine/Wind Brisk Wind, Extreme Wind, Freezing Spray, Gale, Hazardous Seas, High Surf, High Wind, Hurricane Force Wind, Lake Wind, Les Suêtes Wind, Low Water, Marine Weather, Rip Tide, Small Craft, Small Craft Hazardous Seas, Small Craft Rough Bar, Small Craft Winds, Special Marine, Squall, Storm, Strong Wind, Tsunami, Waterspout, Wind, Wreckhouse Winds Pink Miscellaneous Air Quality, Air Stagnation, Ashfall, Blowing Dust, Excessive Heat, Fire Weather, Heat, High Heat and Humidity, Humidex, Humidex and Health, Rainfall, Special Weather, Weather Orange Severe Storm Red Tornado Purple Tropical Hurricane, Inland Hurricane, Inland Tropical Storm, Tropical Storm, Typhoon Dark Gray Visibility Dense Fog, Dense Smoke, Dust Storm, Smog White Winter Arctic Outflow, Avalanche, Blizzard, Blowing Snow, Cold Wave, Extreme Cold, Flash Freeze, Freeze, Freezing Drizzle, Freezing Fog, Freezing Rain, Frost, Hard Freeze, Heavy Freezing Spray, Heavy Snow, Ice Storm, Lake Effect Blowing Snow, Lake Effect Snow, Sleet, Snow, Snow and Blowing Snow, Snow Squall, Snowfall, Wind Chill, Winter Storm, Winter Weather • To view the weather forecast for the next 12 hours, select Next Forecast or , and to view forecasts up to 48 hours, in 12-hour increments, select Next Forecast or again. • To view the weather forecast for the previous 12 hours, select Previous Forecast or , and to view previous forecasts, up to 48 hours ago, in 12-hour increments, select Previous Forecast or again. Weather Fronts and Pressure Centers Weather fronts appear as lines that indicate the leading edge of an air mass. Front Symbol Description Cold front Warm front Stationary front Occluded front Trough Pressure-center symbols often appear near weather fronts. PressureCenter Symbol Description Indicates a low-pressure center, which is a region of relatively lower pressure. Moving away from a lowpressure center results in increased pressure. Winds flow counterclockwise around low-pressure centers in the northern hemisphere. Indicates a high-pressure center, which is a region of relatively higher pressure. Moving away from a highpressure center results in decreased pressure. Winds flow clockwise around high-pressure centers in the northern hemisphere. Viewing a Marine Forecast or an Offshore Forecast 1 Select Weather > Menu > Weather Menu > Change Weather > Forecast. 2 Pan the chart to an offshore location. The Marine Forecast or Offshore Forecast options appear when forecast information is available. 3 Select Marine Forecast or Offshore Forecast. City Forecasts City forecasts appear as weather symbols. The forecast is viewed in 12-hour increments. Symbol Weather Partly cloudy Symbol Weather Fair (sunny, hot, clear) Cloudy Rain (drizzle, sleet, showers) Windy Foggy Thunderstorms Smoke (dusty, hazy) Snow (snow showers, flurries, blizzard, blowing snow, sleet, freezing rain, freezing drizzle) Forecast Information The Forecast chart shows city forecasts, marine forecasts, warnings, hurricane warnings, METARS, county warnings, weather fronts and pressure centers, surface pressure, and WX buoys. Viewing Forecast Information for Another Time Period 1 Select Weather > Menu > Weather Menu > Change Weather > Forecast. 2 Select an option: Viewing Sea Conditions The Sea Conditions chart shows information about surface conditions, including winds, wave height, wave period, and wave direction. Select Weather > Menu > Weather Menu > Change Weather > Sea Conditions. Surface Winds Surface wind vectors appear on the Sea Conditions chart using wind barbs that indicate the direction from which the wind is blowing. A wind barb is a circle with a tail. The line or flag 20 SiriusXM™