Questions tagged [metar]

METAR is a format for reporting the latest available weather information. It is similar to but distinct from TAF.

Filter by
Sorted by
Tagged with
37
votes
4answers
80k views

When are winds given with respect to true vs. magnetic north?

Wind information can be reported by various sources (ATIS, METAR, TAF, spoken on the radio, etc). I was taught that officially some of these sources are relative to magnetic north and others to true ...
11
votes
4answers
2k views

Why don't we get more user-friendly weather reports than METARs?

This question is not about how to decode METARs or what software or tools can be used to decode METARs. It is about why we are still using METARs today. Given that we have smartphones with video ...
30
votes
4answers
60k views

How is wind direction reported (blowing from or blowing to)?

When the tower controller, the ATIS or a METAR says Wind 270, 15 knots does it mean the wind is blowing in the westward or in the eastward direction? Is there a single convention used to express the ...
5
votes
2answers
16k views

What are the criteria for "variable" in METAR reports?

Regarding variable wind direction in METAR reports, what are the criteria for VARIABLE when the authority uses "VRB"? An Advisory Circular mentions the authority uses "V" when the wind direction ...
19
votes
1answer
25k views

Why is mist abbreviated BR on METARs and TAFs?

The abbreviation for a condition of mist is BR on METAR and TAF reports. How did mist end up getting abbreviated as BR?
12
votes
1answer
6k views

What is the difference between RVR and visibility?

What is the difference between Runway Visual Range (RVR) and visibility? Looking at the definitions, both RVR and visibility tells the pilot whether they have enough visibility to land on the runway ...
19
votes
1answer
9k views

What does a dollar sign mean in a METAR?

Look at this METAR: KLOU 151553Z 21005KT 10SM CLR 13/M01 A3044 RMK AO2 SLP309 T01281011 $ What does the dollar sign mean?
11
votes
1answer
5k views

What do the different colors of weather stations indicate on SkyVector?

In this particular map from SkyVector, what are the meanings of the different colored circles, and for the different amounts of 'fill-in'? It's obvious by hovering over them, that they are weather ...
15
votes
1answer
2k views

Does the "Maintenance Indicator" sign on a METAR imply we can't trust it?

As explained in this Q/A: What does a dollar sign mean in a METAR? The presence of a Dollar Sign ($) at the end of a METAR is included when an ASOS/AWSS detects that maintenance is needed on the ...
12
votes
1answer
3k views

What is METAR and how is it read?

I was reading an article about TAM Airlines Flight 3054 crash and I saw the following: METAR SBSP 172200z 35008kt 7000 -ra Bkn008 Ovc070 15/14 Q1018 SBSP 172200z 35008kt 7000 -ra Bkn008 ...
10
votes
2answers
51k views

What are ISA +10, ISA -15 and ISA -30?

I have found out that an ISA atmosphere is: 15 °C temperature 5 °C dewpoint 1013.25 hPa pressure What are the conditions of an ISA +10, ISA -15 and ISA -30? I know the temperature, but what are ...
8
votes
2answers
9k views

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

I'm looking at developing an app where one of the functions I would like to implement needs to use data which is normally available in AIP, like: Aerodrome names, ICAO codes, GPS location, elevation ...
11
votes
1answer
22k views

Where can I get a history of METARs? [duplicate]

Is there a place where past METARs are logged? Suppose I want all the METAR for a given airport from October 1st to October 15th 2015. Where can I find them? If it matters, I'm looking in particular ...
37
votes
2answers
21k views

What is the difference between mist and fog?

Fog is a form of a cloud and it is said clouds are visible moisture. We all know that mist (baby rain) is also moisture so I am curious when will a METAR say BR (mist) or FG (fog)?
15
votes
1answer
862 views

What does the code FU1FU2FU5 mean in this metar?

In their METAR, CYPK reported ... 25SM FEW037 SCT050 OVC250 21/15 A3016 RMK FU1FU2FU5 DENSITY ALT 400FT. Since it's quite smokey out, I would have expected a ...
7
votes
2answers
576 views

What does one do when the weather report has a bogus altimeter setting?

I saw a METAR for a nearby airport that had A2248 ... SLPNO in it with no maintenance indicator. Is the SLPNO a sign that the altimeter setting in the METAR is untrustworthy as well? How else does ...
5
votes
1answer
3k views

Why do METARs report wind relative to true north rather than magnetic?

Why isn't the wind in a METAR given in magnetic heading, to match the runway numbers? Especially for areas where there is a double-digit magnetic declination. Secondary/optional question: does the ...