# FAQ: How To Read Aviation Weather Charts?

## How do you read wind charts in aviation?

The staff part of a wind barb shows wind direction. 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.

## How do I decode a metar report?

Decoding a METAR

1. PHNL = the airfield, Honolulu’s Daniel K.
2. 250953Z = the date and time of the report.
3. 05007G17KT = the wind conditions.
4. 10SM = visibility.
5. FEW024 / FEW040 = cloud cover.
6. 27/19 = the temperature and dewpoint.
7. A3001 = the atmospheric pressure, a.k.a. altimeter setting.

## How long is a TAF valid?

Routine TAFs are valid for a 24-hour period and issued four times daily: 00Z, 06Z, 12Z, and 18Z, and are amended (updated) as conditions require.

## 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.

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## What is weather depiction chart?

A weather depiction chart details surface conditions as derived from METAR and other surface observations. The weather depiction chart is prepared and transmitted by computer every 3 hours beginning at 0100Z time and is valid data for the forecast period.

## How do you read a TAF?

The date and time are formatted using two sets of four digits each with the first two digits representing the day of the month and the second two the 24-hour time in hours only (no minutes since TAFS are issued on the hour). The first set of digits is the start date/time and the second is the end date/time.

## 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.

## What symbol is used to indicate calm winds?

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).

## How do you read wind speed?

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).

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## What does V mean in Metar?

V – Varying. VIRGA – Virga. VRB – Variable. VRB VIS – Variable Visibility. VV – Vertical Visibility, indefinite ceiling.

## What does PK WND mean?

PEAK WIND: PK WND dddff(f)/(hh)mm; direction in tens of degrees, speed in whole knots, and time. PK WND 20032/25. WIND SHIFT: WSHFT (hh)mm. WSHFT 1715. TOWER OR SURFACE VISIBILITY: TWR VIS vvvvv: visibility reported by tower personnel, e.g., TWR VIS 2; SFC VIS vvvvv: visibility reported by ASOS, e.g., SFC VIS 2.