1 Introduction
Tropical forecasts
In this topic you learn how to add tropical forecast information to the map and how to interpret the display.
We estimate that this will take 6 minutes to complete.
2 Detailed explanation
Introduction
Use the Tropical forecasts section of the REGIONAL weather tab to view more detailed information about hurricanes, cyclones, and tropical storms in the areas you are tracking and planning flights.
SCENARIO: The American
National Hurricane Center has put out a message about tropical
storm Isaias.
The storm is
forecast to produce heavy rains over Puerto Rico, the
Dominican Republic, northern Haiti, the Bahamas and Southern
Florida, and then track north.
Rainfall and
wind hazards are expected to extend well beyond the center of
the system.
Enable the
Tropical forecasts weather layer to view updated information
on for hurricanes, cyclones, and tropical storms.
In this example, you have already enabled several weather layers, including American radar images.
Click the Layers button.
Click the Tropical
forecasts slider.
Use the different layers within the Tropical
forecasts group to display different storm
characteristics.
Start by
enabling all model tracks to see the tracks for a given storm.
Tropical storm Isaias is over Haiti, the Dominican Republic
and heading for the coast of Florida.
Click the All
model tracks slider.
Storm tracks display best against darker backgrounds. Adjust the Brightness slider on the GENERAL tab.
Click the GENERAL tab.
Click the Brightness slider.
Click on the left side of the slider to darken the water color.
You can now see the model tracks more easily.
The lines represent the forecast track of storms based on
different models.
The gray lines
represent the track of the storm predicted by various models. The red line
represents the official track.
Click the REGIONAL tab.
Click the Official
track
slider.
The Official track layer displays all
past positions of the storm (shown by the small red dots) and
provides a good view of where the storm has been and the
direction in which it is moving. This data is updated every
six hours or more frequently, as needed.
Symbols used for
the track:
tropical storm
hurricane
tropical depression
past position
As you have seen with other weather features,
you can hover your mouse over the track or click anywhere on
the track to view more details on-screen or in the Weather pane.
Click the Track
probability slider.
The different colors in the graph indicate
different levels of probability.
Hover your mouse
over the center, reddish storm probability band. You can see
details, such as the storm name (Isaias) and its ID.
The probability
for the storm to be present in the red zone is high.
Hover your mouse over another highlighted
area, this one in the outer, yellowish band.
The probability
of the storm traveling into this zone is
currently low.
Disable the first three sliders before you move on to explore the Wind Speed Forecast.
Click the Wind
Speed Forecast slider.
You can see the wind speed forecast shown in
yellow. (The color is greenish over (blue) areas of water.)
Standard colors
used for mapping wind speed (in knots) include:
Hover your mouse
over the wind diagram or click within it to view detailed
information.
Zoom in for better visibility on the islands affected by the storm winds.
Click the Zoom
in (+)
button.
Hover your mouse over the highlighted area of the green outer band. The on-screen information tells you that wind speed is 33 knots.
Hover your mouse over the central, caramel-colored band and you can see that the wind speed in the zone depicted in this color is higher, between 34 and 63 knots.
Zoom out again to a zoom level of 200 nm.
Click the Zoom
out (-)
button.
Click the Layers button.
Disable the Wind Speed Forecast layer before you explore the Rain Forecast layer.
Click the Wind
Speed Forecast slider.
Click the Rain
Forecast
slider.
You are now displaying a color-coded, contoured forecast of rain data values over both land and water areas.
The standard codes used to depict rainfall are
as follows:
Note: This chart uses inches. N-Tracking uses the
same color scheme and associates them with the equivalent
millimeters of precipitation.
Hover your mouse over the dark red band near
the center of the colored shape.
N-Tracking provides
the details that rainfall for this zone is forecast at 152-229
mm.
Hover your mouse over the outer green band.
In contrast,
rainfall for the zone depicted in this color is estimated at
25 mm.
If you hover your mouse over a region for which radar images are also available, N-Tracking displays details for both weather layers.
Disable the Rain Forecast layer before you move on to the last layer in this group.
Click the Rain
Forecast
slider.
Click the Wave
Forecast
slider.
The color coding shows the height of the waves
in feet.
The standard
colors used for the graph include:
Change the zoom to 500 nm.
Click the Zoom
out (-)
button.
The Wave Forecast layer works exactly like the other weather layers that use different colors to depict different intensity of the weather phenomenon you're looking at. If you hover your mouse over the outer green zone, the wave height associated with tropical storm Isaias shows as 0.9 meters.
Hover your mouse over the reddish zone nearer the center of the shape, and you see that wave height is forecast at 4.6 to 6.1 meters.
SUCCESS
Congratulations! At this point, you have
successfully worked with the weather layers that focus on
tropical weather phenomena. Use them as needed in your flight
monitoring tasks.
For information
on depicting other regional weather phenomena on the map,
consult the related topics.