About NOTAMET
What this service is, and what it is not
NOTAMET gathers aeronautical information published by official providers — observations, forecasts, warnings and notices — and puts it in one place for flight preparation and for keeping a record of what was checked. It is an independent service. It is not an aeronautical information service, and it does not issue, amend or interpret any notice.
01 Where each datum comes from
“Collected” is the interval at which our workers pull the feed. “Read on request” means the provider is queried when a page or a briefing asks for that aerodrome. All times are UTC.
| Data | Provider | Refresh |
|---|---|---|
| METAR · SPECI · TAF | NOAA / NWS Aviation Weather Center | Collected every 15 minutes |
| SIGMET | NOAA / NWS Aviation Weather Center SIGMET only. AIRMET is not part of this feed, so we do not publish it. | Collected every 15 minutes |
| NOTAM — worldwide | FAA NOTAM system (NMS) | Delta every 3 minutes · full file daily at 04:30 UTC |
| NOTAM — Spain | ENAIRE / INSIGNIA Falls back to the FAA feed when INSIGNIA returns nothing. | Read on request, per aerodrome |
| NOTAM — Chile | DGAC Chile, IFIS (AIP Chile) Falls back to the FAA feed when IFIS returns nothing. | Read on request, per aerodrome (10–25 s) |
| Aerodrome reference | OurAirports (public domain) | Fixed dataset, refreshed with releases |
| Climate normals | NOAA GSOD, 1991–2020 | Fixed reference period |
| Wind and temperature profiles | NOAA GFS 0.5°, via NOMADS | Four cycles a day (00/06/12/18 UTC), published with a delay of several hours |
The text you see is the one the provider currently publishes: when a notice is replaced or cancelled, the page shows the new one. The raw feed we archive is kept for reconstruction, not shown as if it were current.
02 What we stand behind
- The provider’s own wording. Every notice keeps the text its provider published. The Q-code decoding, severity labels and flight categories are ours; the raw message is one click away in every list.
- Provenance you can check. Each item records which provider it came from and when it was received. The raw feed is archived unedited, so a past briefing can be rebuilt from what actually arrived.
- Gaps are shown as gaps. An empty list means the provider returned nothing current for that filter. We do not fill a gap with yesterday’s data or with a plausible-looking example, and a value that did not arrive is left blank rather than guessed.
- UTC, next to the number. Observation, issue and validity times are UTC and sit beside the value they qualify — not in a footnote.
03 What we do not promise
- It is not an official briefing. NOTAMET is not an aeronautical information service and none of this is approved for operational use. The pilot in command and the operator remain responsible for the flight and for verifying every item against the official publication of the competent authority.
- It is not complete. We show what the providers publish and transmit to us. A notice issued minutes ago may not have arrived yet, and we cannot show what no provider sends us.
- Generated text can be wrong. The summary in a briefing is written by a language model. It is checked against the values it cites and it can still be wrong: read the raw METAR, TAF and NOTAM behind it.
- The archive is not a legal record. It is an operational record of what we received and when — useful for a compliance file, not a certified or legal archive, and no substitute for the provider’s own publication.
- No warranty of availability. The service can be interrupted by maintenance or by a provider outage. It is offered “as is”, without warranty of any kind.
04 Who is behind it
NOTAMET is run by José María Hontoria de la Esperanza, an independent operator based in Seville, Spain. It is not affiliated with, endorsed by or acting on behalf of ENAIRE, DGAC Chile, the FAA, NOAA, Eurocontrol or any other authority whose data it re-uses. The names of those bodies appear only to identify where a datum comes from.
Company details are in the legal notice; the terms and privacy policy describe the rest.
05 Report an error
Write to hola@notamet.com with the aerodrome or FIR, the time in UTC and, if you have it, the raw text of the message. Say what you expected to see. We read every report.
If the mistake is in the provider’s own publication, only that provider can correct it; we will tell you when that is the case.
Page updated 9 November 2026.