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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

Light Blue Flash Flood

Dark Blue Flood

Yellow

Marine/Wind

Pink

Miscellaneous

Orange

Severe Storm

Red

Tornado

Purple

Tropical

Dark

Visibility

Gray

White

Winter

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

Select Weather > Menu > Weather Menu > Change

Weather > Forecast.

Select an option:

Weather Subcategories

Areal Flood, Coastal Flood, Debris Flow,

Flood, High Water Level, Hydrological,

Lakeshore Flood, Storm Surge

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

Air Quality, Air Stagnation, Ashfall,

Blowing Dust, Excessive Heat, Fire

Weather, Heat, High Heat and Humidity,

Humidex, Humidex and Health, Rainfall,

Special Weather, Weather

Hurricane, Inland Hurricane, Inland

Tropical Storm, Tropical Storm, Typhoon

Dense Fog, Dense Smoke, Dust Storm,

Smog

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

Pressure-center symbols often appear near weather fronts.

Pressure-

Description

Center

Symbol

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

Select Weather > Menu > Weather Menu > Change

Weather > Forecast.

Pan the chart to an offshore location.

The Marine Forecast or Offshore Forecast options appear

when forecast information is available.

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

Cloudy

Windy

Thunderstorms

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

Description

Cold front

Warm front

Stationary front

Occluded front

Trough

Symbol Weather

Fair (sunny, hot, clear)

Rain (drizzle, sleet, showers)

Foggy

Snow (snow showers, flurries,

blizzard, blowing snow, sleet,

freezing rain, freezing drizzle)

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