# wind rose

(redirected from wind roses)
Also found in: Dictionary, Thesaurus, Medical.

## wind rose

[′win ‚drōz]
(meteorology)
A diagram in which statistical information concerning direction and speed of the wind at a location may be summarized; a line segment is drawn in each of perhaps eight compass directions from a common origin; the length of a particular segment is proportional to the frequency with which winds blow from that direction; thicknesses of a segment indicate frequencies of occurrence of various classes of wind speed.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

## Wind Rose

a graph representing wind conditions at a given location; usually constructed for a month, season, or year, using data gathered over many years. The values of the recurrence of directions (as a percentage of the total number of observations) or of the average and maximum wind speeds corresponding to each rhumb are plotted to scale along eight or 16 rhumbs in the form of vectors. The ends of the vectors are joined by a line.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

## wind rose

A diagram for a given location showing the relative frequency and the velocity of the wind from a selected compass direction.
A wind rose indicates how wind speed and directions are typically distributed at a particular location. Presented in a circular format, the wind rose shows the frequency of winds blowing from particular directions. The length of each “spoke” around the circle is related to the frequency of time that the wind blows from a particular direction. Each concentric circle represents a different frequency, emanating from zero at the center to increasing frequencies at the outer circles. The wind roses shown here contain additional information, in that each spoke is broken down into discrete frequency categories that show the percentage of time that winds blow from a particular direction and at certain speed ranges. All wind roses shown here use 16 cardinal directions, such as north (N), NNE, NE, etc. This rose shows that the winds at this particular location in April blow from the northwest much of the time. In fact, the 3 spokes around the northwest direction (WNW, W, and NNW) comprise 50% of all hourly wind directions.
References in periodicals archive ?
Although the wind roses depend on the openness of the measuring site for different wind directions as described above, the general tendencies of changes are still clear.
These changes appear more clearly in case of seasonal wind roses of change in Vilsandi (Fig.
Higher occurrence of W winds is illustrated by wind roses which likely shifted from east to west.
Changes in the autumn wind roses differ from those of the other seasons.
The probability density function for wind directions is simply the classical wind rose (combined, if necessary, with the frequency of calm situations).
If wind directions during all the 2-minute intervals within any 3 hours were independent and the wind rose was more or less circular, only a few directions would match the direction, measured during the quasi-traditional session.
Figure 5 shows that the continuous recording results in a more round wind rose than the quasi-traditional recording.
It is primarily evident in seasons with low wind speeds and at times it substantially distorts the shape of the wind rose. This reduction evidently reflects a certain ambiguity in the estimation of the frequency of calm situations from the automatic weather station data.
In July the wind roses at the surface are different at Harku and Jokioinen for both noon and midnight data.
The distributions of wind direction, described by means of wind roses, are similar at both stations in July, but differ somewhat in January when the difference is the largest in the stratosphere during daytime.
The wind rose at Hanko shows that this feature is caused by atmospheric dynamics.

Site: Follow: Share:
Open / Close