How do you decode winds aloft?
How do you decode winds aloft?
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.
What does 9900 mean for winds aloft?
Wind direction is indicated in tens of degrees (two digits) with reference to true north and wind speed is given in knots (two digits). a. Light and variable wind or wind speeds of less than 5 knots are expressed by 9900.
How do you read wind direction in forecasting?
Wind direction is generally reported by the direction from which it originates. For example, a north or northerly wind blows from the north to the south. The exceptions are onshore winds (blowing onto the shore from the water) and offshore winds (blowing off the shore to the water).
How do you read upper level wind charts?
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 9999 mean in a TAF?
Visibility 9999 means the visibility is greater than 10 km. / / means this part of the METAR is not available (ie cloud and visibility not available from an automated weather station)
How do you read wind readings?
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.
What does NNE wind mean?
north north east
A north north east (NNE) wind is a common wind direction for after a cold front. NNE winds typically occur right after the straight northerly winds of a cold front. If the cold front is strong and brings much colder air down then it’ll be common to experience NNE winds the morning after the front passes.
