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
Group
Weather Subcategories
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
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:
• 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.
Pressure-
Center
Symbol
Description
Indicates a low-pressure center, which is a region of
relatively lower pressure. Moving away from a low-
pressure 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 high-
pressure 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
Symbol Weather
Partly cloudy
Fair (sunny, hot, clear)
Cloudy
Rain (drizzle, sleet, showers)
Windy
Foggy
Thunderstorms
Snow (snow showers, flurries,
blizzard, blowing snow, sleet,
freezing rain, freezing drizzle)
Smoke (dusty, hazy)
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™
