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Roost Air Lounge => The Classroom => Topic started by: Aviation Freak on July 14, 2008, 04:09:05 PM

Title: How to Read METAR
Post by: Aviation Freak on July 14, 2008, 04:09:05 PM
I guess this is one thing a pilot must read before they depart. :P
I've figured out most of it except what is beyond the RMK part is.

METAR KJFK 141551Z 23010KT 10SM FEW055 BKN120 BKN250 24/16 A2987 RMK AO2 SLP116 T02390161

METAR from wunderground.com

EDIT:
I don't know if it's just me, but this one seems longer? http://flightaware.com/live/airport/KJFK (http://flightaware.com/live/airport/KJFK)
Title: Re: How to Read METAR
Post by: Fabo on July 14, 2008, 04:22:27 PM
METAR - we know

KJFK - JFK International, NYC, NY

141551Z - 14th of respective month, issued at 15 51Z

23010KT - wind 230 degrees 10 knots

10SM - visibility 10 statute miles or better

FEW055 - few clouds at 5500ft AGL

BKN120 - broken clouds at 12 000 AGL

BKN250 - broken clouds at 25 000

24/16 - temperature 24 degrees, dewpoint 16, now cause this is JFK I think Fahrenheit (?)

A2987 - altimeter  29.87, roughly equivalent to Q1011.5 hPa

RMK - remarks

AO2 - METAR message is autogenerated, has precip sensors and is observed by real operator

SLP116 - sea level pressure in dunno

T02390161 - hourly temperature and dewpoint - 0 means 0C+, then 239 means 23.9C, same for dewpoint


PS: this might help if you cant decipher ;) http://weather.cod.edu/notes/metar.html
Title: Re: How to Read METAR
Post by: G-man on July 14, 2008, 04:53:42 PM
OK--I'll buy a beer for anyone who can translate the portion of this TAF that is in red AND explain for who and why that information is presented. ::drinking:: ::drinking::

KSUU 141555Z AUTO 23019KT 10SM CLR 18/13 A2989 RMK AO2 PK WND 23028/1530 SLP122 T01810128 $

KSUU 141212 24018G25KT 9999 SKC QNH2984INS
BECMG 1415 24015KT 9999 SKC QNH2982INS
BECMG 2324 24020G25KT 9999 SKC QNH2980INS T32/23Z T15/13Z     

I gave you the METAR also--not that it will help.. ::whistle:: ::whistle:: And yes I do know what it means. ::whistle:: ::whistle::.
Title: Re: How to Read METAR
Post by: AirScorp on July 14, 2008, 08:36:53 PM
Knew the what, found out the who and still can't think of why.. Will hold back for someone to get the beer :)
Title: Re: How to Read METAR
Post by: Oddball on July 14, 2008, 11:01:01 PM
I'm not even going to try decipher that got enough to do as it is lol.
Title: Re: How to Read METAR
Post by: Aviation Freak on July 14, 2008, 11:38:35 PM
24/16 - temperature 24 degrees, dewpoint 16, now cause this is JFK I think Fahrenheit (?)
SLP116 - sea level pressure in dunno


PS: this might help if you cant decipher ;) http://weather.cod.edu/notes/metar.html

It has to be Celsius because 24F would mean it's oddly cold for summer. :P

116 hPa?  ???

I guess I'm set now. :D Thanks!
Title: Re: How to Read METAR
Post by: G-man on July 15, 2008, 12:01:09 AM

SLP116 - sea level pressure in dunno

116 hPa?  ???

[/quote]

It is 31.16--they drop the 3 or the 2, (as in 29.92).
Title: Re: How to Read METAR
Post by: Thunder Eagle on July 15, 2008, 12:29:43 AM

SLP116 - sea level pressure in dunno

116 hPa?  ???


It is 31.16--they drop the 3 or the 2, (as in 29.92).
[/quote]

Close... but not quite right.   It's 1011.6 hPa.  The first 10 part is assumed... unless the station is hit by a hurricane and it's a 9 instead.
Title: Re: How to Read METAR
Post by: chuckar101 on July 15, 2008, 02:01:47 AM

SLP116 - sea level pressure in dunno

116 hPa?  ???


It is 31.16--they drop the 3 or the 2, (as in 29.92).

Close... but not quite right.   It's 1011.6 hPa.  The first 10 part is assumed... unless the station is hit by a hurricane and it's a 9 instead.
[/quote]

On hpa just add a nine or ten to the front, whichever brings the number closest 1000.
Title: Re: How to Read METAR
Post by: G-man on July 15, 2008, 02:20:01 AM
On hpa just add a nine or ten to the front, whichever brings the number closest 1000.

Yep---thats what comes with not paying attention-- ::drinking:: ::drinking::

Still not takers on the SUU TAF though--c'mon..at least guess..Airscoop??
Title: Re: How to Read METAR
Post by: AirScorp on July 15, 2008, 02:51:29 AM
Ok I'll give it a shot:

What I knew: T32/23Z means surface Temperature is predicted to be 32 degrees at(/) 23:00 Zulu time

What I found out: It's for the air force guys. Seems that the only airports that have this code group are military airports, at least in the US.

What I don't know: Why they put the surface temp in the end of the TAF in that format instead of also giving temp and dewpoint information on every line like the METAR. That would make more sense. Except if they list the max and minimum temp forecasted for the day, but I think the code for max temp should be something like TX32/23Z.

Hehe, the internet is a great thing  |:)\ So, why is it there G-man?
Title: Re: How to Read METAR
Post by: G-man on July 15, 2008, 05:39:44 AM
Ok I'll give it a shot:
What I found out: It's for the air force guys. Seems that the only airports that have this code group are military airports, at least in the US.
So, why is it there G-man?

Pretty good--I'll buy you a beer.

It is the forecasted highest and lowest temperature for the next 24 hours... It is only on "MAC" bases--(Military Air Command), they use it for planning the best time to take off for the most efficient flight.

T32/23Z T15/13Z Highest temp of 32 C will occur @ 2300Z and lowest temp of 15 C will occur @ 1300Z.

Title: Re: How to Read METAR
Post by: TheSoccerMom on July 15, 2008, 05:42:53 AM
Whoaaa, cool.....

Never would have guessed it!  And here I thought it was what hours the airport bar was open....   ::whistle::

"23Z until 13Z"......   ::silly::

 :D

Title: Re: How to Read METAR
Post by: G-man on July 15, 2008, 05:43:49 AM
Whoaaa, cool.....

Never would have guessed it!  And here I thought it was what hours the airport bar was open....   ::whistle::

"23Z until 13Z"......   ::silly::

 :D


Like it--like it a lot.. ::drinking:: ::drinking::
Title: Re: How to Read METAR
Post by: AirScorp on July 15, 2008, 11:26:09 AM
Whoaaa, cool.....

Never would have guessed it!  And here I thought it was what hours the airport bar was open....   ::whistle::

"23Z until 13Z"......   ::silly::

 :D



Nyaaaa! That's what airport NOTAMs are for  ::drinking:: ::drinking:: ::drinking:: ::drinking:: ::drinking::
Title: Re: How to Read METAR
Post by: Baradium on August 02, 2008, 11:40:07 PM
PAFA 011253Z 20004KT 2SM -RA BR FEW008 BKN014 OVC030 09/07 A2975 RMK AO2 RAB03 SLP078 VIS N 3 P0002 T00890072

PAFA 011753Z 20003KT 1 3/4SM R01L/5000VP6000FT -RA BR BKN005 OVC012 11/09 A2977 RMK AO2 RAB16 SLP086 P0001 60006 T01060089 10106 20089 51005

PABR 021753Z AUTO 25007KT 10SM BKN005 BKN008 OVC021 01/00 A2974 RMK AO2 CIG 003V006 SLP073 T00110000 10011 21006 53013 TSNO

KDEN 021953Z 30019G27KT 10SM SCT080 BKN140 BKN220 35/01 A2998 RMK AO2 PK WND 28027/1949 SLP049 VIRGA ALQDS T03500006

KBIL 020153Z COR 26015KT 10SM FEW030 36/M01 A2968 RMK AO2 SLP007 FU FEW030 FU DSNT SE-SW T03611011

PADQ 021153Z 00000KT 3SM -RA BR OVC004 11/11 A3000 RMK AO2 DZB18E51RAB51 CIG 001V007 SLP158 60003 70003 T01110111 10117 20111 51004

PAJN 021753Z 00000KT 10SM FEW010 SCT017 OVC046 13/09 A3012 RMK AO2 SLP199 MTNS PRTLY OBSCD N-E-SW SUN DMLY VSBL BINOVC T01280089 10128 20100 52003

PAPG 011436Z 03003KT 10SM FEW006 BKN029 OVC085 09/09 A2988 RMK AO1 WEA: NONE PNO


Some are easier than others...  the phrase I was searching for and couldn't find was ACSL... context:

"ACSL DIST NE-SW" 

I've only seen it at a handful of airports, not too common.


http://aviationweather.gov/notice/taf30.php

Some information on the TAF format change that is coming up in November.
Title: Re: How to Read METAR
Post by: AirScorp on August 03, 2008, 05:56:58 AM
Some are easier than others...  the phrase I was searching for and couldn't find was ACSL... context:

"ACSL DIST NE-SW" 

I've only seen it at a handful of airports, not too common.

Mmmmm.. Guys here tell me it stands for AltoCumulus Standing Lenticular. Maybe there was a mountain peak round those airports?
Title: Re: How to Read METAR
Post by: Rooster Cruiser on August 03, 2008, 06:52:10 AM
Some are easier than others...  the phrase I was searching for and couldn't find was ACSL... context:

"ACSL DIST NE-SW" 

I've only seen it at a handful of airports, not too common.

Mmmmm.. Guys here tell me it stands for AltoCumulus Standing Lenticular. Maybe there was a mountain peak round those airports?

Nick, your buddies are correct.  ACSL is what Wx reporting systems use to describe the phenomenon known as a Mountain Wave.  This is generally associated with strong winds blowing across mountain ranges that sets up the Lenticular clouds.  This is a soaring pilots delight as they can stay up for long periods in the updraft portions of a mountain wave.  However, the mountain wave is also associated with severe to extreme turbulence and MUST be treated with enormous caution and respect by all pilots.  This one can be a killer if you get caught in the rotor cloud that sometimes forms in the lee of the mountain range, or if you try to cross the range going into the wind and get caught in a downdraft you cannot climb out of.

ACSL formations are always unique and often are eerily looking.  I love seeing pics of them, but I do not enjoy seeing the underside of them from a cockpit.   |:)\
Title: Re: How to Read METAR
Post by: AirScorp on August 03, 2008, 02:58:21 PM
Great description R/C!  ::bow:: Seen it a couple of times too! We have just the right ingredients on a mountain peak just opposite my city!
Title: Re: How to Read METAR
Post by: TheSoccerMom on August 04, 2008, 06:03:56 PM
That's a pretty common one to see in the mountains... 

that is, if you check the weather....  HAAAAAAAAAAAA.

 ::eek::
Title: Re: How to Read METAR
Post by: Baradium on August 04, 2008, 06:45:30 PM
Used to see them on a regular basis flying over the Alaska Range between fairbanks and Anchorage.


Interestingly enough... I fly into a lot more higher altitude airports now than I did up north....   
Title: Re: How to Read METAR
Post by: chuckar101 on August 05, 2008, 04:00:57 AM
What there's weather reports, I though you just took off and hoped for the best. ::whistle:: ::whistle::  Oh sorry thats just freight dogs, we are a bit different.
Title: Re: How to Read METAR
Post by: TheSoccerMom on August 05, 2008, 06:51:21 PM
ha ha NOPE!!!!!!!!!!!!!!!
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