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Wind Roses

Illustrations of wind direction movement at particular Texas cities from 1984 to 1992, used to help predict long term air quality.

These wind roses were made using software (WRPLOT) and data from 1984 through 1992 that was obtained from the Exit the TNRCCU.S. Environmental Protection Agency (EPA).

City Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Abilene J F M A M J J A S O N D All
Amarillo J F M A M J J A S O N D All
Austin J F M A M J J A S O N D All
Beaumont/
Port Arthur
J F M A M J J A S O N D All
Brownsville J F M A M J J A S O N D All
Corpus Christi J F M A M J J A S O N D All
Dallas/
Fort Worth
J F M A M J J A S O N D All
El Paso J F M A M J J A S O N D All
Hondo J F M A M J J A S O N D All
Houston J F M A M J J A S O N D All
Lubbock J F M A M J J A S O N D All
Lufkin J F M A M J J A S O N D All
Midland J F M A M J J A S O N D All
San Angelo J F M A M J J A S O N D All
San Antonio J F M A M J J A S O N D All
Stephenville J F M A M J J A S O N D All
Victoria J F M A M J J A S O N D All
Waco J F M A M J J A S O N D All
Wichita Falls J F M A M J J A S O N D All

Wind Rose Information

  • The station identification, month, and period of record (1984-1992) are located at the top left of each wind rose.
  • The percent frequency of calm winds is located in the lower left side of the wind rose plot.
  • The frequency of occurrence of winds is plotted in the sixteen points of the compass (north, north-northeast, northeast, etc.) with a maximum of six wind speed classes for each direction.
  • The legend for the wind speed colors is at the bottom left of each wind rose.

Wind Rose Uses

Wind roses can be used to graphically depict the predominant transport direction of an area's winds. Wind rose statistics may not always be representative of true transport for an area due to local terrain influences, coastal effects, exposure of the instruments, and temporal variability of the wind. Other meteorological conditions may also be important for determining the formation and transport of certain atmospheric contaminants, particularly reactive pollutants.

Air quality is often correlated with the dominant transport direction of the wind. Wind roses provide the best information regarding the percentage of time the direction(s) and speed(s) associated with a certain air quality can be expected over a long period of time. By comparing wind roses to trajectories an assessment of how frequently that particular trajectory could be expected over a period of time.