Weather Defender Documentation

Page History: Hurricane Layers

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Page Revision: 06/01/2009 10:39 PM

1 - Introduction

With Weather Defender you can track Hurricanes, Tropical Storms, and other cyclonic activity. Different from other Weather Layers, a set of Hurricane Layers is provided for every active storm, and continuously updated. Sixteen layers in all give you extremely detailed and precise information about each Hurricane's track and anticipated movements.

Hurricane Tracking Layers

Hurricane Tracking Layers

1.1 - Access

Hurricane Layers are available from the Layer Browser during Hurricane Season each year (generally June through December).

You may be required to upgrade your account before accessing the Hurricane Layers.

1.2 - Data Sources

Hurricane Layer datasets are derived from National Hurricane Center, Central Pacific Hurricane Center, and Joint Typhoon Warning Center forecast advisories issued for tropical depressions, tropical storms, and hurricanes or typhoons.

1.3 - Update Frequency

The Hurricane Centers have the following standard times for forecast advisory issuance:

  • 09 UTC (5 AM EDT) Where UTC is also known as GMT or Zulu
  • 15 UTC (11 AM EDT)
  • 21 UTC (5 PM EDT)
  • 03 UTC (11 PM EDT)

As with other Weather Layers in Weather Defender, Hurricane Layers will automatically update when added to your Map.

2 - Layer Descriptions

2.1 - Current Winds


The Current Winds layer will display up to three rings, representing the extent of tropical storm force winds (34kt or 39mph) in blue, 50kt or 58mph winds in yellow, and hurricane force (64kt or 74mph) winds in red. These are the 3 standard wind ranges provided by the Hurricane Centers.

2.2 - Forecast Points, Forecast Line


The Hurricane Center issues storm location and intensity projections for up to seven time periods: 12, 24, 36, 48, 72, 96, and 120 hours into the future. Forecast Points are shown as open squares along the forecasted track. They are labeled by default with the date and Eastern Time.

Forecast Line is the dashed line ahead of the storm representing where the storm center is projected to track within the next 3 to 5 days (72 to 120 hours).

Forecast Winds

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