Terminal aerodrome forecast one of your best sources

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An Introduction to Physical Science
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Chapter 19 / Exercise 12
An Introduction to Physical Science
Shipman/Wilson
Expert Verified
TERMINAL AERODROME FORECAST One of your best sources for an estimate of what the weather will be in the future at a specific airport is the terminal aerodrome forecast (TAF). TAFs normally are valid for a 24-hour period and are scheduled four times a day at 0000Z, 0600Z, 1200Z, and 1800Z. Each TAF contains these elements: type, location, issuance date and time, valid date and time, and the forecast. [Figure 7-10] TAFs usually are valid for a 24-hour period and are scheduled four times a day. TAF codes are similar to those used in METARs. You should be familiar with the abbreviations and codes contained in the following discussion. TYPE OF FORECAST TAF AMD KLFK... The TAF normally is a routine forecast. However, an amended TAF (TAF AMD) may be issued when the current TAF no longer represents the expected weather. TAF or TAF AMD appears in a header line prior to the text of the forecast. The abbreviations COR and RTD indicate a corrected and delayed TAF, respectively. The example depicts an amended TAF. STATION IDENTIFIER AND ISSUANCE DATE/TIME TAF AMD KLFK 221555Z 221612... 7-18 The four-letter ICAO location identifier code is the same as that used for the METAR/SPECI. The first two numbers of the date/time group represent the day of the month, and the next four digits are the Zulu time that the forecast was issued. The Figure 7-10. With a few exceptions, the codes used in the TAF are similar to those used in the METAR.
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An Introduction to Physical Science
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Chapter 19 / Exercise 12
An Introduction to Physical Science
Shipman/Wilson
Expert Verified
example TAF is a forecast for Angelina County Airport (KLFK) which was issued on the 22nd day of the month at 1555Z. VALID PERI O D ...221555Z 221612 06006KT... Normally, the forecast is valid for 24 hours. The first two digits represent the valid date. Next is the beginning hour of the valid time in Zulu, and the last two digits are the end- ing hour. The forecast for Angelina County Airport is valid from 1600Z on the 22nd of the month to 1200Z the next day. Since the TAF in the example was amended, the valid period is less than 24 hours. At an airport that is open part time, amendments are not issued after closing time. If an airport closes at 0500Z, for instance, the TAF may include a statement such as, NIL AMD NOT SKED AFT 0500Z. When part-time airports are closed, the word NIL appears in place of the forecast for those locations. FORECAST ...221612 06006KT P6SM OVC015 TEMPO 1619 4SM -TSRA BKN010CB... The body of the TAF contains codes for forecast wind, visibility, weather, and sky con- dition in much the same format as the METAR/SPECI. Weather, including obstructions to visibility, is added to the forecast only when it is significant to aviation. In a TAF, expected visibilities greater than 6 statute miles are forecast using a P (plus). In the exam- ple, the winds are predicted to be from 060° at 6 knots, visibility is expected to be greater than 6 statute miles, and an overcast cloud layer is forecast at 1,500 feet AGL.

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