Hot answers tagged

15

The NOTAM format is from the time when people still would call the value of individual bits over a phone line. Ok, that may not have happened, but my point is that data transfer was incredibly slow compared to current day standards. Therefore a compact format saved significant transmission time and cost without losing any information. The format didn't ...


13

Complete, unless you want to know the height of base of those TCU's! The bulk of the information you're after can be found in AIS-GEN 3.5 Section 10.17 - AUTO METAR coding In describing the coding used by automated systems, it gives this example NNNhhh/// Cloud detected, but it is unknown whether it is a convective cloud type (ie TCU or CB) And this ...


6

ICAO is offering a very nice API for retrieval of, for example, aerodrome names/ICAO codes and NOTAM's. It is currently in public beta, which means that it is free to use. Once they finish testing it, there will be some kind of cost involved, but they have not published any pricing details yet. You can find it here: https://www.icao.int/safety/iStars/Pages/...


5

Terminal refers to the airspace near the airport, more or less similar to the ATC usage of terminal as in "terminal airspace" or area. TAFs cover the airspace in a 5 mi radius of an aerodrome, the immediate terminal area. The T in METAR also refers to terminal as in "Meteorological Terminal Aviation Routine Weather Report".


5

PROB40 is targeted only on the immediate TEMPO group. If there are several PROB/TEMPOs both keywords must be repeated every time. Also, PROB is never associated with BECMG or FM groups, which indicate permanent change.


5

According to NOAA, there should be a space between the whole and fractional parts. But they would never use a fractional part greater than 1, so your example must be a typo and should have read "1 1/2SM".


5

As I understand your question is mainly about line E of a NOTAM, right? Well, this one is in fact meant to use 'plain' English language, in contrast to all other lines, where location and reach as well as type and urgency and duration is encoded. Just, as it already has been mentioned, NOTAMs originate in a time when transmission speed was unimaginable slow ...


5

1 - It's always been done that way. 2 - You'd be surprised how many government computer systems are still using ancient hardware and operating systems.


5

It means that the report is from an automated weather station and information from sensors are not available for visibility etc. From AIP Australia: 12.20.1 A report from a fully automated AWS that does not include information from sensors for visibility, weather or cloud will report ////, // or ////// respectively in lieu of these parameters. For this ...


4

This isn't much of an explanation, but the National Weather Service says: The international TAF also contains forecast temperature, icing, and turbulence. These three elements are not included in National Weather Service (NWS) prepared TAFs. The U.S. has no requirement to forecast temperatures in an aerodrome forecast That sounds to me like "we don'...


3

I'm a UK PPL of 14 years, I fly out of North Weald which is on the opposite side on London to Farnborough, so I'm well placed to give you some tips here. First, use the Met Office aviation portal for your planning, most of the services a PPL will use are free. Metars are useless for planning as they only say how the weather is right now, TAFs are good for ...


3

The BECMG group in a TAF describes a gradual change which will take place over a prolonged period of time, but will be the prevailing weather once that change is complete. The time period described in the TAF is the beginning and ending hour during which the gradual change is forecast to be in progress. At the end of the described time the change is expected ...


3

Usually, when we translate TAFs we use the word expect. So, in this case, we expect the visibility to drop from 600m to 150m. So when planning a flight you would use 150m. Also, I find it odd how the time format is different to what I am used to. At my local airport, this is the TEMPO in the TAF. TEMPO 0302/0307 6000 SHRA SCT030TCU So this would translate....


3

TEMPO means that there were be fluctuations in the weather in the time period specified, lasting as long as 50% of the time range specified. TEMPO 0406 0150 FG VV001 means that in the period between 04:00 and 06:00 UTC the visibility will at some point go down to 150 in heavy fog, and it could last up to an hour in total. One thing I would point out is that ...


3

There used to be a good technical reason (transmission time over low-rate modems), so everyone learned how to decode things. That original reason has long since gone away, but nearly everyone affected has already learned the code, so the short-term benefits of changing are minimal--and accrue mainly to new entrants (who have little/no power) whereas the ...


2

For the current format, it was 1993 when it was standardized. On July 1, 1993, a new, revised Terminal Aerodrome Forecast (TAF) format and code replaced the existing TAF code. This new code is in effect in most countries. The exceptions are the United States and Canada. These two countries issue Terminal Forecasts for domestic use and TAFs for the military ...


2

You can find a nice set of APIs at: https://developer.laminardata.aero/documentation/notamdata/v2


2

First you will need to learn to decode the TAF's validity period. TAF YMAY 022230Z 0300/0312 35010KT CAVOK FM030800 31018KT 9999 SHRA BKN025 OVC100 INTER 0308/0312 31020G40KT 3000 +TSRA BKN010 SCT040CB RMK FM030600 MOD TURB BLW 5000FT T 23 24 28 33 Q 1012 1013 1014 1009 The validity of this TAF (in bold) is formatted as ddhh/ddhh. Validity period of ...


2

I am a private pilot with just VFR rating. I check many weather sites before I make a decision as to is it ok for me to fly or not. I call 800-WXbrief, which for US is a very good source, too. I also have developed friendships with many instructors who have been flying to airports of my potential destinations for many years. I ask them about weather ...


1

METAR The METAR always refers to a specific airport and is obtained right then and there. That is at the airport. It is a report of current conditions, usually hourly. In the US, the FAA polls all systems remotely and disseminates the reports in METAR format. No word on wether this is via phone, mobile or radio, if that is what you are asking. In ...


1

One might consider reading books about aviation weather. Weather Flying by Robert Buck is timeless, and is good for VFR and IFR flight. All my primary and instrument students read it. I cannot remember any student complaining about having assigned reading in that book. One way is to start by looking at the PROG charts about two days in advance and ...


1

The METAR only gives you a small snapshot in time. They are only good for an hour. They are usually refreshed around 55 minutes past the hour. TAFs, on the other hand, cover a 24 to 30 hour period and they are published 6 times a day (0000, 0600, 1200, 1800). Routine TAFs are valid for 24-hours. SPECI is an aviation special weather report issued when there ...


1

TAFs quite similar to what they are now were used with the rollout of DUATS in 1990. Prior to that there were several transitions from teletype symbols to normal characters. Even with the old special tty symbols, the TAFs still had essentially the same content.


1

Because the FAA imagines that we are still in the teletype age, and thus believes that every bit of text not actually burned into the the paper scroll (or perhaps we should say every byte of information not transmitted over the wires) is a precious saving of some sort. It's exactly the same misguided reason that airport weather reports (METARS) are still ...


Only top voted, non community-wiki answers of a minimum length are eligible