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Viewing forecast information – Garmin GPSMAP 4000 User Manual

Page 55

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GPSMAP 4000 Series Owner’s Manual

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Understanding County Warnings

When the National Weather Service issues a weather warning for a county, the county is highlighted

with the color corresponding to the warning. To view information about the warning, select the

county.

Tornado Warning

Severe Thunderstorm Warning

Flood Warning

Flash Flood Warning

Viewing Forecast Information

Forecasts show the weather conditions including fronts and precipitation. To view the forecast for

another time period, select

Next Forecast

. The forecasted weather for the next 12 hours is shown.

Continue to select

Next Forecast

to view forecasts for the next 24, 36, and 48 hours. To view

forecast information for another location,

press the

ROCKER

and use the map pointer ( )

until

the desired location appears.

Understanding Fronts

The Fronts show lines indicating the leading edge of an air mass. This feature also shows pressure

centers. Pressure centers are represented by a large Red “L” for low pressure centers or a large Blue

“H” for high pressure centers. Pressure centers represent an area where pressure is measured to be

either the highest or lowest relative to the surrounding area.

Cold Front

Warm Front

Stationary Front
Occluded Front

Trough

Indicates a Low Pressure Center. A Low Pressure Center is an area where the measured

pressure is lowest relative to the surrounding area. Moving away from a Low

Pressure Center in any horizontal direction results in increased pressure. Winds flow

counterclockwise around Low Pressure Centers in North America.
Indicates a High Pressure Center. A High Pressure Center is an area where the measured

pressure is highest relative to the surrounding area. Moving away from a High Pressure

Center in any horizontal direction results in decreased pressure. Winds flow clockwise

around High Pressure Centers in North America.