Juneau Wind and Ops Information - Information and Help

Project Summary

The Juneau Wind and Ops Information Web Page is part of the Prototype Juneau Airport Wind System (JAWS) developed for the Federal Aviation Administration (FAA) by the Research Applications Laboratory (RAL) of the National Center for Atmospheric Research (NCAR). Its purpose is to enhance aviation safety in the region of the Juneau Airport by providing turbulence alerts based on realtime wind information from anemometers and wind profilers at strategic locations. This information is being provided to the FAA, the National Weather Service (NWS), commercial airlines, and general aviation users.

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Sensor Types and Locations

Anemometers measure wind speed and direction, as well as temperature and relative humidity, at a single location.

Wind profilers are radars that look vertically and measure wind speed and direction as a function of height above the radar. These measurements are reported for a number of representative altitudes.

Data Update Rates

Anemometer data are updated every minute.
Data are average values from the previous 1-minute interval.
Profiler data are updated every 10 minutes.
Data are average values from the previous 10-minute interval.

Measurement Units

Wind speeds are given knots.

Wind directions are magnetic and are the direction from which the wind is coming.

The diagram shows True North (N) and Magnetic North (M).

Direction angle is measured clockwise from Magnetic North.
The magnetic declination for Juneau is approximately 29.5 degrees.
To calculate the wind direction relative to True North, add 29.5 degrees.

Status Indicators

Data values which are unavailable are indicated by 'NA' and a gray background.
Data values which did not pass quality control are indicated by 'NA' and a white background.
Data values which are not produced by the sensor are indicated by a '-' and a white background.
Ops Spec Departure Alerts show the status of wind limits on Part 121 operations.
Separate indicators are provided for Fox departure, Lemon Creek departure, and RNP 08/26 arrivals and 08 departures.
Ops Spec Departure Status which is within limits (GO) is highlighted with a green background.
Ops Spec Departure Status which is outside limits (NO GO) is highlighted with a red background.

Trouble Shooting

Recommended Browsers
- Netscape 4.51 or higher
- InternetExplorer 4.0 or higher
This page has been tested using Netscape 4.51 under Linux and 4.07 under IRIX 6.5 and InternetExplorer 4.0 under NT. Other browsers are not necessarily supported although an attempt has been made to be as generic as possible.
Data Not Updating
Click on your browser's "Reload" button.
The Juneau Wind and Ops Information page uses "client pull" technology to cause the time and table displays to be refreshed periodically from the server. Occasionally the tables or time may stop updating properly and you will notice that the incorrect time is displayed or the "table update" times are not current. Time and table automatic update can be restarted by clicking on your browser's "Reload" button.
Netscape Dies when I click on Feedback
This is a known bug in Netscape 4.5.1. As a workaround, use the following procedure before attempting to send feedback the first time during a session.
- Click left on the Netscape Edit.
- Click left on Preferences at the bottom of the Edit menu.
- When the Preferences window appears, click on Cancel

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