Trend type forecast

Last updated March 16, 2019

In aviation meteorology, a trend type forecast (TTF), also known simply as a trend, is a weather forecast written by a person on location at a major airport or military base. A TTF is a professionally considered forecast for weather over a two-hour period,^[1] and is based on an actual weather report, such as a METAR or SPECI and appended to the end of it.^[1] A TTF is similar to or sometimes in addition to a TAF, a terminal aerodrome forecast, but during the TTF's validity period is considered superior to a TAF.^{[ citation needed ]}

An airport is an aerodrome with extended facilities, mostly for commercial air transport. Airports often have facilities to store and maintain aircraft, and a control tower. An airport consists of a landing area, which comprises an aerially accessible open space including at least one operationally active surface such as a runway for a plane to take off or a helipad, and often includes adjacent utility buildings such as control towers, hangars and terminals. Larger airports may have airport aprons, taxiway bridges, air traffic control centres, passenger facilities such as restaurants and lounges, and emergency services. In some countries, the US in particular, they also typically have one or more fixed-base operators, serving general aviation.

Military base facility directly owned and operated by or for the military

A military base is a facility directly owned and operated by or for the military or one of its branches that shelters military equipment and personnel, and facilitates training and operations. A military base provides accommodations for one or more units, but it may also be used as a command center, training ground or proving ground. In most cases, military bases rely on outside help to operate. However, certain complex bases are able to endure on their own for long periods because they are able to provide food, water and other life support necessities for their inhabitants while under siege. Military bases for military aviation are called military air bases. Military bases for military ships are called naval bases.

METAR is a format for reporting weather information. A METAR weather report is predominantly used by pilots in fulfillment of a part of a pre-flight weather briefing, and by meteorologists, who use aggregated METAR information to assist in weather forecasting.

Example

EGXE 061150Z 03010KT 9999 FEW020 17/11 Q1014 BLU TEMPO 6000 SHRA SCT020 WHT=

In this example the METAR indicates it is from EGXE (RAF Leeming) at 1150 UTC on Day 6. The observation follows (see METAR for explanation), with the Trend added to the end of the observation.

Royal Air Force Leeming or RAF Leeming is a Royal Air Force station located near Leeming, North Yorkshire, England. It was opened in 1940 and was jointly used by the RAF and the Royal Canadian Air Force (RCAF). Between 1950 and 1991, it operated mostly as a training base with Quick Reaction Force (QRF) Tornado F3 fighters based there in the latter stages of the Cold War and into the early 21st century. Since 2006, it has become the home of the deployable RAF communications cadre and the home of No. 135 Expeditionary Air Wing.

The Trend reads TEMPO 6000 SHRA SCT020 WHT i.e. Temporary deterioration to 6 km visibility in a moderate rain shower with scattered at 2000 ft, colour state White.

Colour states is a system used for quickly showing meteorological conditions.

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TTF may refer to:

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References

1 2 "Annex 3 to the Convention on International Civil Aviation – Meteorological Service for International Air Navigation", Sixteenth Edition July 2007, para 6.3.3, p. 6-2.

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[ICAO-1] 1 2 "Annex 3 to the Convention on International Civil Aviation – Meteorological Service for International Air Navigation", Sixteenth Edition July 2007, para 6.3.3, p. 6-2.