METAR - SPECI Observations

I Disappear When You Log In - Register

 

I Disappear When You Log In - Register

^^ The Advertisements above disappear once you log in. Not a member? Register Now, it's free! ^^
Page 1 of 2 1 2 LastLast
Results 1 to 20 of 30
  1. #1
    I am THE Pocket Ninja

    Status
    Offline
    Join Date
    Jun 2008
    Location
    farmingdale ny
    Posts
    1,510

    METAR - SPECI Observations

    what in the hell are metar speci, what do they stand for and are they some type of mean alien chinchilla things?
    Mother is the name for God on the lips and hearts of all children. Do you understand?-Eric Draven, The Crow

  2. #2
    Roddy_Piper's Avatar
    Resident Knucklehead

    Status
    Offline
    Join Date
    Jun 2008
    Location
    Vegas baby
    Posts
    3,339

    Re: can someone explain...

    both are weather terms. i don't remember exactly what metar stands for, but it's something like meteorological report. speci is just a special metar.

    metar - the normal weather sequence reported every hour by a certified weather observer.
    speci - a special weather sequence reported at any time because it meets certain criteria. if you see a speci it's usually because the weather is deteriorating, or it's already bad and it's improving. you won't see a speci on a clear day.

  3. #3
    Roddy_Piper's Avatar
    Resident Knucklehead

    Status
    Offline
    Join Date
    Jun 2008
    Location
    Vegas baby
    Posts
    3,339

    Re: can someone explain...

    here's the criteria for a speci. probably more than u ever care to know about it. if u get a tower there's a chance you could be a LAWRS observer. so maybe u do care to know it.

    7-13. CRITERIA FOR SPECI OBSERVATIONS
    The observer shall take, record and disseminate a SPECI observation when any of the following is observed to occur:

    a. Wind Shift. Wind direction changes by 45 degrees or more in less than 15 minutes
    and the wind speed is 10 knots or more throughout the wind shift.

    b. Visibility. Visibility as reported in the body of the report decreases to less than, or if below, increases to equal or exceed:
    (1) 3 miles
    (2) 2 miles
    (3) 1 mile
    (4) The lowest standard instrument approach procedure minimum as published in the National Ocean Service (NOS) U.S. Terminal Procedures. If none published, use 1/2 mile.

    c. Runway Visual Range. (NA LAWRS) The highest value from the designated
    RVR runway decreases to less than, or if below, increases to equal or exceed 2,400 feet during the preceding 10 minutes.

    d. Tornado, Funnel Cloud, or Waterspout.
    (1) Is observed
    (2) Disappears from sight or ends

    e. Thunderstorm.
    (1) Begins (a SPECI report is not required to report the beginning of a new thunderstorm if one is currently reported)
    (2) Ends

    f. Precipitation.
    (1) Hail begins or ends
    (2) Freezing precipitation begins, ends, or changes intensity
    (3) Ice pellets begin, end, or change intensity

    g. Squall. Wind speed suddenly increases by at least 16 knots and is sustained at 22 knots or more for at least one minute.

    h. Ceiling. The height of the base of clouds covering five eighths or more (e.g., broken and overcast) of the sky forms or dissipates below, decreases to less than or, if below, increases to equal or exceed:
    (1) 3,000 feet
    (2) 1,500 feet
    (3) 1,000 feet
    (4) 500 feet
    (5) The lowest standard instrument approach procedure minimum as published in the National Ocean Service (NOS) U.S. Terminal Procedures. If none published, use 200 feet.

    i. Sky Condition. A layer of clouds or obscuring phenomenon aloft is present below 1,000 feet and no layer aloft was reported below 1,000 feet in the preceding METAR or SPECI observation.

    j. Volcanic Eruption. When eruption is first noted.

    k. Aircraft Mishap. Upon notification of an aircraft mishap, unless there has been an intervening observation.

    l. Miscellaneous. Any other meteorological situation that, in the opinion of the observer, is critical.

  4. #4
    irishcarbomb's Avatar
    Epic Member

    Status
    Offline
    Join Date
    Dec 2008
    Location
    Houston, TX
    Posts
    1,801

    Re: can someone explain...

    metar - routine aviation weather report
    speci - metars come out 50-55 past the hour. if they have to make one at any other time for some reason, they make it a speci
    Last edited by irishcarbomb; 06-08-2009 at 02:11 PM. Reason: way to read above...just echoing i guess :(
    Commercial SEL, MEL, Instrument, CFI, CFII

  5. #5
    I am THE Pocket Ninja

    Status
    Offline
    Join Date
    Jun 2008
    Location
    farmingdale ny
    Posts
    1,510

    Re: can someone explain...

    actually im a dorky nerd, i was hoping someone would put a bunch of info up...awesome....
    Mother is the name for God on the lips and hearts of all children. Do you understand?-Eric Draven, The Crow

  6. #6
    Rookie

    Status
    Offline
    Join Date
    Feb 2009
    Posts
    46

    Re: can someone explain...

    For the civilian side,

    FMH-1: Federal Meteorological Handbook No. 1 - Surface Weather Observations and Reports

    FMH-1

    For the military, Air Force, side of the house,

    AFMAN 15-111: Air Force Manual 15-111

    http://www.e-publishing.af.mil/share...FMAN15-111.pdf

    Thanks to the head of Air Force Weather in all his brilliance removed the table of contents from the 15-111 among many other things that continues to drive AF Weather into the ground.

    Some fine reading there for you

  7. #7
    Singingastro's Avatar
    Trusted Member

    Status
    Offline
    Join Date
    May 2009
    Location
    Houston, TX
    Posts
    337

    Re: can someone explain...

    Quote Originally Posted by liandrajade View Post
    actually im a dorky nerd, i was hoping someone would put a bunch of info up...awesome....
    haha usually very exciting to do... especially during boring times!! do it again, do it again

  8. #8
    BoRn2CoNtRoL's Avatar
    Senior Member

    Status
    Offline
    Join Date
    Apr 2009
    Location
    Virginia Beach via Jersey
    Posts
    166

    Re: can someone explain...

    a speci is a special weather report when signifigant weather change happends within an hour

  9. #9
    Newcomer

    Status
    Offline
    Join Date
    Jul 2009
    Posts
    1

    Re: can someone explain...

    Hey there -

    SPECI stands for, essentially a SPECIAL aviation weather report.
    METAR, I believe, stands for Aviation Routine METeorological report, or words to that effect. I read somewhere it was a French term.

    METAR's are ROUTINE hourly weather observations which contain information about winds, present weather conditions (precip, fog, etc), sky cover, visibility, temperature and dew point, and atmospheric pressure, which are significant to safe aviation. They are usually done 5 or 10 minutes before every hour under any weather condition, clear skies to hurricane.

    SPECI's are weather observations which are taken under SPECIAL situations such as severe weather situations which could be hazardous to aviation (thunderstorm, tornado, volcanic eruption!, ice pellets, etc). They are done as soon as possible when significant weather phenomena appear which therefore could be at any time during any given hour.

    Hope this helps!

    Regards,

    raspberryroses
    Last edited by raspberryroses; 07-11-2009 at 02:06 AM. Reason: clarification

  10. #10
    SnowAviation's Avatar
    Senior Member

    Status
    Offline
    Join Date
    Jan 2009
    Location
    Southern California TRACON
    Posts
    292

    Re: can someone explain...

    Another good reference - National Weather Service Handbook #8 however it's from 1996.

    http://www.nws.noaa.gov/os/coop/Publications/WSOH8.pdf

  11. #11
    PapaGolf's Avatar
    Trusted Member

    Status
    Offline
    Join Date
    Jun 2009
    Location
    Biscuit
    Posts
    382

    Re: METAR - SPECI Observations

    now do you know how to READ one?

  12. #12
    otterstrom's Avatar
    Trusted Member

    Status
    Offline
    Join Date
    Jun 2008
    Location
    of NATCA
    Posts
    461

    Re: METAR - SPECI Observations

    :deadhorse:


    haha, i think shes got the flick.

  13. #13
    Senior Member

    Status
    Offline
    Join Date
    Oct 2009
    Location
    Ohio
    Posts
    164

    Re: can someone explain...

    Quote Originally Posted by SnowAviation View Post
    Another good reference - National Weather Service Handbook #8 however it's from 1996.

    http://www.nws.noaa.gov/os/coop/Publications/WSOH8.pdf
    This is the current version used for producing METARs, etc. Usually the NWS is about 20 years behind on publishing new material.

  14. #14
    otterstrom's Avatar
    Trusted Member

    Status
    Offline
    Join Date
    Jun 2008
    Location
    of NATCA
    Posts
    461

    Re: can someone explain...

    Quote Originally Posted by Roddy_Piper View Post
    metar - the normal weather sequence reported every hour by a certified weather observer.
    but more often an AWOS or ASOS.

  15. #15
    Roddy_Piper's Avatar
    Resident Knucklehead

    Status
    Offline
    Join Date
    Jun 2008
    Location
    Vegas baby
    Posts
    3,339

    Re: can someone explain...

    Quote Originally Posted by otterstrom View Post
    but more often an AWOS or ASOS.
    true...but some of the codes in an automated ob are different than in a manual.

    ie. SKC vs CLR, 10SM vs 25SM, blah blah.

  16. #16
    otterstrom's Avatar
    Trusted Member

    Status
    Offline
    Join Date
    Jun 2008
    Location
    of NATCA
    Posts
    461

    Re: METAR - SPECI Observations

    yep. .

  17. #17
    Senior Member

    Status
    Offline
    Join Date
    Oct 2009
    Location
    Ohio
    Posts
    164

    Re: can someone explain...

    Quote Originally Posted by otterstrom View Post
    but more often an AWOS or ASOS.
    I believe the output from an AWOS/ASOS is something like every 3 minutes (depends on the system and how new it is). While it outputs often, the ATIS is only updated with the current wx information every hour (or when a SPECI warrants) and at large airports the data is looked at by a weather observer to check for accuracies and change anything that is incorrect. Most of your normal METARs are normally the exact data from the AWOS/ASOS but they aren't perfect, which is why the weather observer checks the data for accuracies.

    But officially, a METAR is only published once per hour (and a SPECI as those conditions are observed).

  18. #18
    Rookie

    Status
    Offline
    Join Date
    Aug 2009
    Posts
    58

    Re: METAR - SPECI Observations

    I know this is an old thread...but I was wondering if I should spend much time learning METAR before I go to the academy?

  19. #19
    Roddy_Piper's Avatar
    Resident Knucklehead

    Status
    Offline
    Join Date
    Jun 2008
    Location
    Vegas baby
    Posts
    3,339

    Re: METAR - SPECI Observations

    i wouldn't bother learning to encode or the criteria, but u eventually need to know how to read one (or decode).

  20. #20
    Rookie

    Status
    Offline
    Join Date
    Aug 2009
    Posts
    58

    Re: METAR - SPECI Observations

    Thank you!

Page 1 of 2 1 2 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •