# How To Read An Aviation Wind Chart?

## How do you read wind data?

A small, open circle indicates that the winds are calm. This usually means that the wind speed is less than 1.74 knots (2 mph). A single short line (half line) or “feather” represents 5 knots (5.75 mph) of wind speed. A single long line (full line) or “feather” represents 10 knots (11.50 mph).

## How do you read upper wind temperature chart?

They follow the format ddfftt, where dd is the wind direction (true), ff is the wind speed (in knots) and tt is the temperature (in degrees Celsius). Subtracting 100 knots from the speed and adding 50 to the direction indicate wind speeds from 100 to 199 knots. For example, 240 degrees @ 130 knots is coded 7430.

## What is the symbol for wind?

Observed Winds: represented by wind barbs. The symbol highlighted in yellow (in the diagram above) is known as a ” Wind Barb”. The wind barb indicates the wind direction and wind speed. Wind barbs point in the direction “from” which the wind is blowing.

## How do I read isobars?

Isobars are the demarcation line where the pressure will be the same along its entire length. Wind travels along the length of the isobar, and the closer the isobars are, the stronger the wind will be. Wind travels counter clockwise around low pressure systems and clockwise around high pressure systems.

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## How do I read a winds aloft report?

If the wind speed is forecast to be from 100 to 199 kt., the forecaster will add 50 to the wind direction and subtract 100 from the wind speed. To decode, you must subtract 50 from the wind direction and add 100 to the wind speed.

## How do you read winds aloft numbers?

To convert wind directions reported greater than 360, subtract a 5 from the first number to determine wind direction and add 100 to the wind group. Example: 7508 = 250º at 108 knots. Winds greater than 200 knots are reported as 199 knots. Example: 7599 = 250º at 199 (> than 200kts).

## Are upper winds in true or magnetic?

The general rule is: If you read it, it’s true. If you hear it, it’s magnetic. All charts and textual sources (METAR, TAF, winds aloft, surface analysis charts, etc) use true north as the reference.

## How do you read wind weather?

Wind direction is defined as the direction the wind is coming from. If you stand so that the wind is blowing directly into your face, the direction you are facing names the wind. That’s why a north wind generally brings colder weather temperatures to Chicago and a south wind implies a warmup.

## What is the symbol for wind on a weather map?

Wind Symbols Wind speeds indicated by a white circle with an arrow at the top pointing in the wind direction. The arrow is always relative to true North.

## How do you read wind arrows?

Reading The Wind Direction The arrows indicate the direction the wind is going based on North being at the top of the screen and West being at the left. This is opposite of what a typical weather vane shows, because they point into the wind, rather than the direction it is headed. Take a “Northerly” wind, for example.

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## How do you read a meteorological chart?

How to read synoptic weather charts

1. Pressure pattern. The circular lines you see on the chart are isobars, which join areas of the same barometric pressure.
2. Cold fronts and warm fronts. Also on a synoptic chart are the lines, triangles and semi-circles representing ‘fronts’.
3. Warm and cold fronts.
4. Occluded fronts.
5. Troughs.

## Is Rain high or low pressure?

Generally high pressure means fair weather, and low pressure means rain.