Sponsor Message:
Civil Aviation Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Atis / ASOS....What Is The Difference?  
User currently offlineRefueler1974 From United States of America, joined Mar 2004, 235 posts, RR: 0
Posted (12 years 1 month 2 weeks 3 days 5 hours ago) and read 24823 times:

Hello! I work at the FBO at AEX, and I hear pilots asking for the ATIS frequency quite a bit They seem a little upset when they are told that we don't have ATIS, be we have ASOS instead. I thought that these 2 were about the same...but I guess I was wrong. Can anyone tell me what is the difference between these 2?

The only time you have too much fuel is when you're on fire.
3 replies: All unread, jump to last
User currently offlineBritPilot777 From United Kingdom, joined Apr 2004, 1075 posts, RR: 2
Reply 1, posted (12 years 1 month 2 weeks 3 days 4 hours ago) and read 24807 times:


The ASOS system is a collection of automated surface weather instruments that collect data. It performs surface observations in places that either do not have a human observer, or an observer 24-hours a day. The pilot is required to tune into the frequency and listen to the weather. On talking to ATC at an airfield tell them they have ASOS (also there is AWOS)

The ATIS requires a human observer looking at the weather themselves using instruments such as the barometer etc, and records the latest weather themselves talking. These are done several times a day as the human observer feels the weather has sufficiently changed that the pilot must know. Each of these recordings is given the code of Alpha, then Bravo, Charlie etc to Zulu. This goes on all day. On contact with Approach or the airfield the pilot will respond with saying "with Zulu" therefore telling the controller he has the latest weather.

Forever Flight
User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 2, posted (12 years 1 month 2 weeks 3 days 4 hours ago) and read 24795 times:

ATIS is for Automated (or Automatic, I can't recall which) Terminal Information Service, and it's a short endless loop tape recorded each hour by tower personnel that gives weather, runway in use, and NOTAM info. It's usually "cut" or recorded once an hour (when the new METAR comes out) can be updated sooner should conditions warrant. Each ATIS broadcast is given a letter, "Alpha", "Bravo", etc. so you can tell when it's been updated.

ASOS is for Automated Surface Observation System, and it's a system comprised of various sensors that actually take readings used in the hourly METAR report, stuff like wind direction/speed, cloud cover, temp/dewpoint, and baro pressure. The observations that ASOS creates are available via conventional computer access, but they are also broadcast on a VHF freq assigned to a specific ASOS, and some can even be accessed by phone. ASOS takes an observation every minute.

The main differences are that ASOS doesn't give you any runway in use info, or NOTAM info.

User currently offlineFsuwxman From United States of America, joined Jan 2002, 439 posts, RR: 3
Reply 3, posted (12 years 1 month 2 weeks 2 days 23 hours ago) and read 24766 times:

ASOS- "A Shitty Observing System"- as it is know by many, is a collection of weather instruments which requires constant babysitting and amending. It requires an (overpaid) observer, certified by the NWS to take surface weather observation, to sit there and look at the OID during commercials, to push F19 twice an hour to silence the alarm, walk out side at :45 past the hour to check the sky cover, cuz even when the sky is BKN, ASOS like to show CLR, and when the instruments on the ASOS break down, the observer much go outside and take manual observation... When you call the number you get the ASOS. I got much more I could say about it, but that is the gist of it. BTW, I am the "overpaid" observer on duty right now at a major South Florida airport...

About the ATIS... ATIS is the recording done by the tower whenever I transmit an observation that is assigned a letter and contains any pertinent information about the airfield at that time. ATIS is transmitted on a airband frequency... I know one airport where the ATIS is actually broadcasted when you call the ASOS number... BTW- that airport is KHWO...

ASOS... Another Shi#y Observation Station
Top Of Page
Forum Index

This topic is archived and can not be replied to any more.

Printer friendly format

Similar topics:More similar topics...
What Is The Difference Between A342 And 343/346 posted Wed Jul 5 2006 18:48:39 by Myk
Airlines & Airways - What Is The Difference? posted Fri Jan 14 2005 06:39:01 by September11
What Is The Difference Between ER And LR? posted Tue Aug 3 2004 22:58:24 by BoeingPride800
What is the difference between the B737-300, -400 etc posted Mon Mar 15 2004 18:51:03 by Catholic2006
What Is The Difference Between Chinese Airlines? posted Tue Feb 24 2004 15:34:51 by Amirs
What Is The Difference Between A Saab 340A & 340B? posted Sun Oct 27 2002 04:23:02 by Aussie_
What Is The Difference Between Lease And Wet-Lease posted Thu Sep 5 2002 20:38:50 by Ptica2000
What Is The Difference Between A MD82 And MD83? posted Sat Mar 30 2002 00:45:23 by 9Y-ISA
What Is The Difference Btn The 747-200F & 300F? posted Sat Mar 9 2002 15:24:54 by Flying-b773
What Is The Difference, TAP Business/economy? posted Fri Nov 9 2001 03:24:54 by JAT
What Is The Difference, TAP Business/economy? posted Fri Nov 9 2001 03:24:54 by JAT