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15 votes

Why do NOTAMs consist of code instead of plain language?

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 ...
DeltaLima's user avatar
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10 votes
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What are the meanings of the phrases DAY, RWYCC, 6/6/6 in ATIS?

RWYCC 6/6/6 means "Runway Condition Codes" of 6 (dry) for the first, middle, and last third of the runway. RCC's, as they're also known, are a relatively new way to report the state of the ...
Ralph J's user avatar
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9 votes
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What regulation or publication specifies that a TAF is good for a 5 statute mile radius around the reporting point?

I've found it in two official US government documents where it describes the 5 SM radius for TAFs. One from NOAA: NWS TAFs consist of the expected meteorological conditions significant to aviation at ...
Canuk's user avatar
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8 votes
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How to programmatically access AIP data, METAR, TAF, NOTAMs?

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, ...
60levelchange's user avatar
6 votes

Why do NOTAMs consist of code instead of plain language?

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 ...
Raffzahn's user avatar
  • 555
6 votes

Why do NOTAMs consist of code instead of plain language?

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.
Steven Brame's user avatar
5 votes
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Why the "Terminal" in Terminal Aerodrome Forecast?

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 ...
John K's user avatar
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5 votes
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How to interpret BECMG and TEMPO in TAF?

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 ...
J W's user avatar
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5 votes
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What exactly is the difference between RA, SHRA and TSRA in METAR and TAF reports?

Short answer: RA: Moderate rain TSRA: Thunderstorm with rain SHRA: Shower(s) of rain How ...
mins's user avatar
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5 votes

Why are min and max temperatures (TN TX) not published in TAFs in the United States?

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 ...
Pondlife's user avatar
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5 votes
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Is the "PROB" in a TAF only applying to the next group or all following ones?

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 ...
busdriver's user avatar
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5 votes

Is "11/2SM" a typo in this TAF message?

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/...
StephenS's user avatar
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3 votes
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How can an inexperienced pilot tell if the weather is good enough for flying?

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 ...
GdD's user avatar
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3 votes

How should I interpret this TAF involving TEMPO and BECMG blocks?

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 ...
Tristan Beaton's user avatar
3 votes

How should I interpret this TAF involving TEMPO and BECMG blocks?

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 ...
GdD's user avatar
  • 54k
3 votes

Why do NOTAMs consist of code instead of plain language?

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 ...
StephenS's user avatar
  • 27.7k
2 votes

Why do NOTAMs consist of code instead of plain language?

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 ...
quiet flyer's user avatar
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2 votes

How can an inexperienced pilot tell if the weather is good enough for flying?

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 ...
kamran's user avatar
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2 votes

What exactly is the difference between RA, SHRA and TSRA in METAR and TAF reports?

TS stands for thunderstorms, so TSRA means rain associated with thunderstorms. RA means steady and continuous rain. SHRA means rain showers. Showers stop and start abruptly and can vary in intensity.
Chris's user avatar
  • 16k
2 votes

What exactly is the interval and duration of occurrence represented by the acronym TEMPO?

Weather is dynamic and it doesn't always go along with the weather report. TEMPO 0414/0418 -SHRA This indicates that between 14z and 18z there will be rain showers ...
wbeard52's user avatar
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2 votes
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Is a question mark in a TAF forecast ever valid?

There are no question marks nor any reference to them in neither the ICAO Annex 3 nor the WMO 306 Manual on Codes. These documents are the standards used for meteorological reports and forecasts in ...
cars's user avatar
  • 36
2 votes

What are the duration of TAFs?

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 ...
shogunnyan's user avatar
2 votes

How to programmatically access AIP data, METAR, TAF, NOTAMs?

You can find a nice set of APIs at: https://developer.laminardata.aero/documentation/notamdata/v2
b.a.0's user avatar
  • 21
2 votes

How to interpret BECMG and TEMPO in TAF?

TEMPO is a temporary fluctuations in the time frame given, the fluctuations should be not more than an hour in each instant and in aggregate it should be not more than half of the forecasting period. ...
emmanel's user avatar
  • 21
1 vote
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1.VRB02KT: Is it varying more or less than 180°? 2.VRB03KT: Is it surely varying more than 180°?

Based on these criteria, is there a way to identify if a variable 2KT wind is varying less or more than 180° when the indication is just VRB02KT? No, there is no way to tell. And you don't need to ...
60levelchange's user avatar
1 vote

How to interpret BECMG and TEMPO in TAF?

In plain words- Becoming means that once the change occurs, you can now relate to the changes noted in the Becoming report as prevailing. More closely- you regard every improvement occurring as it ...
Stan's user avatar
  • 443
1 vote

How can an inexperienced pilot tell if the weather is good enough for flying?

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 ...
mongo's user avatar
  • 17.8k
1 vote

How can an inexperienced pilot tell if the weather is good enough for flying?

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 ...
Barry's user avatar
  • 11
1 vote

How are METARs published?

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 ...
mike's user avatar
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