Standard Wind Analysis

The Standard Wind Analysis tool performs the wind analysis specified in AC 150/5300-13, Airport Design, and stores the uploaded data and calculated results to a text file (*.TBW), an AutoCAD Drawing Interchange file (*.DXF), or a scalable vector graphics file (*.SVG). Additionally, the data and results can display in a browser window as a report or the traditional Windrose graphic. This tool requires the wind data files in FAA data format. You can generate wind data files by selecting the Windrose File Generator as a tool option on the FAA Airport Surveying - GIS Program home page under Airport Design Tools section

The Windrose File Generator:

  • connects to the Integrated Surface Hourly/Integrated Surface Data (ISH/ISD) inventory from the National Climate Data Center (NCDC)
  • compiles and summarizes the latest 10 years of wind observations by hours from the recording station associated with your airport location ID (ICAO Identifier)
  • produces three different types of wind data files (ALL_WEATHER, IFR, and VFR) in the FAA format with the recording station number as a part of the filename and PRN as its file type

You can generate and download these wind summary files and later upload them into the wind table for your particular type of Windrose analysis. For background information on the NCDC's ISH/ISD wind data inventory, visit the NCDC web site. If you've already had your own PRN files in the FAA format, you can skip this step of generating of the wind data files and click on the Upload Wind Data File link to load wind data into the wind table for analysis.

Links, buttons, and fields on the main Wind Analysis page include:

Wind analysis tool field and button definitions
Tool, field, or button Definition

newAllWeatherWindrose

newIFRWindrose

newVFRWindrose

To begin wind analysis, select one of these links. Each variation lets you manage wind data for that context. Clicking any of these links clears the winds table and begins a new weather analysis session. Important: Save any previously generated, displayed data before you click one of these links.
open windrose option Use this link to open a previously saved windrose link. These files normally have the ".TBW" file extension. To modify a previous wind analysis, reload an existing file, make your changes, and save the file.
Save windrose option Use this link to save all current analysis work to your local computer as a ".TBW" file. You can interrupt and restart a wind analysis by saving the file.
Upload Wind Data File option

Use this link to load wind data contained in ".PRN" files.

Lines in the PRN file have a maximum of 120 columns. The first 80 columns of the third line state the location (source) name. The windrose analysis tool displays this value in the Source field at the bottom of the table.

Lines 12 through 48 are wind observation data. The first word is the wind direction, the second word is the number of 0-3 knot wind observations, the third word is the number of 4-6 knot wind observations, and so on. The number of wind observations will be zero for words that are not numbers or are omitted. The tool ignores all other data.

View Report option Use this link to display a tabular report of the wind table including the wind coverage for the specified runways, crosswind, and tailwind components. The tool formats this report for an 8.5 x 11 page.
View windrose option Use this link to display the Windrose graphic showing wind coverage analysis for the specified runways, crosswind and tailwind components, and supplied wind data.

Download as DXF

Download as SVG option

Click one of these options to save the displayed windrose graphic as either an AutoCAD DXF file, or as an SVG file.  These file types let you import windrose graphics into other applications.
Calculate button Click this button to analyze the wind and runway data to determine how long (in percent) the specified runways meet the crosswind and tailwind component conditions.  The wind coverage percent does not update automatically; if the tool displays an asterisk (*) in the Calculate button, recalculate. The analysis automatically recalculates when you click View report, View windrose, Download as DXF, or Download as SVG.
Title: Type the name of the wind report in this field.
Number of runways

Specify from one to six runways. For each runway include specific orientations and wind components:

  • Runway orientation: Specify the true orientation for each runway. Some runways are treated as unidirectional. If you want to model both ends of the runway, enter a tailwind component of 60 knots.
  • Crosswind and Tailwind Component: Specify the desired crosswind and tailwind component in knots. To model a bidirectional runway, specify a tailwind component of 60.
Hourly Observations of Wind Speed (knots) Manually insert wind data into this table. You can also upload wind data from a PRN file using Upload wind data file option.