Question: How To Read Aviation Wind Temp Data?

How do you read an aviation Wind chart?

The dot end of the staff is where the wind is blowing to, while the top of the staff shows the direction from which the wind is coming. The top row of wind barbs in the figure to the right all indicate a north wind. The dot is to the south and the top of the wind barb staff is to the north.

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 does 9900 mean on winds aloft?

1. The correct answer is B. A winds aloft forecast of 2722, for example, would indicate 22 knots of wind from 270 degrees. 9900 means no specific direction (variable) and less than 5 knots (light). (

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How do you read a wind and temperature aloft forecast?

To decode, you must subtract 50 from the wind direction and add 100 to the wind speed. a. In the STL forecast, the coded group at 39,000 ft. is 731960. The wind is from 230° true (73 − 50 = 23) at 119 kt.

How do I read raw metar data?

METAR Present Weather and Obscurations (If any)

  1. Intensity. (-): Light. ( ): Moderate [No prefix] (+): Heavy.
  2. Descriptor. MI: Shallow. BC: Patches. DR: Low Drifting.
  3. Precipitation. DZ: Drizzle. RA: Rain. SN: Snow.
  4. Obscuration. BR: Mist. FG: Fog. FU: Smoke.
  5. Other. PO: Well-Developed Dust/Sand Whirls. SQ: Squalls.

What is the weather symbol for wind?

Wind Speed & Direction Calm wind is indicated by a large circle drawn around the skycover symbol. One long barb is used to indicate each 10 knots with the short barb representing 5 knots.

What is the symbol for wind speed?

Wind direction (dd) and speed (ff) are plotted at the center of the station model plot. A wind barb (dd) extends from the direc- tion the wind is blowing to the circle. In the example below the wind is from the northwest and speed “ff” is represented by flags on the wind barb.

How do I read a Metar file?

The first two digits are the date, the 16th of the month, and the last four digits are the time of the METAR, which is always given in coordinated universal time (UTC), otherwise known as Zulu time. A “Z” is appended to the end of the time to denote that the time is given in Zulu time (UTC) as opposed to local time.

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How do you calculate winds aloft?

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.

What does 9999 mean on a TAF?

9999. This value represents a visibility greater than 9000. meters (7 SM or more). The contraction CAVOK (ceiling and visibility OK) may be used when there is no significant weather, the visibility is 10 km or greater, and the ceilings are greater than 5,000 ft.

How do you read wind barbs?

Calm wind is indicated by a large circle drawn around the skycover symbol. One long barb is used to indicate each 10 knots with the short barb representing 5 knots. At 50 knots, the barbs changes to a pennant. For wind speeds higher than 50 knots, long and short barbs are used again in combination with the pennant(s).

Are winds aloft in true or magnetic?

Winds Aloft Remember that these winds directions are given in relation to true north, not magnetic north. Wind aloft reports generally do not report wind conditions close to the surface, for example at the airports of departure or arrival. For this information, the Airport METAR is the best source.

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