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Not a warning service. Follow IPMA, ANEPC and your local authorities. We aggregate public sources, each with its source and the time we read it.

Open data and APIs

stated on the page: nomads.ncep.noaa.govpublishesNOAA (NWS, NCEP, NESDIS)Bodiesstated on the page: open-meteo.comtakes its data fromOpen-MeteoOpen data and APIsstated on the page: nomads.ncep.noaa.govcarriesGFS (NOAA/NCEP)Modelsstated on the page: nomads.ncep.noaa.govcarriesGEFS (NOAA/NCEP)ModelsNOAA NOMADS (NCEP model output)Open data and APIs

Left: what points at it. Right: what it points at. Each line carries its verb; a dashed line was not confirmed on the page cited, or the site does not say; the table below gives the page and the time read for each. From data-noaa-nomads.json

Where a forecast comes from · Open data and APIs · id data-noaa-nomads · as data

GFS, GEFS and other NCEP model output as GRIB2 over HTTPS, with a filter that cuts a region and variables.

Address: https://nomads.ncep.noaa.gov/ (leaves this site)

What it is connected to, and who says so

ThisVerbThatThe page that says soReadCheck
NOAA NOMADS (NCEP model output)carriesGFS (NOAA/NCEP)nomads.ncep.noaa.gov: "the column headings for description of each data access method. Data Set freq grib filter https Global Models AIGFS 6 hours - https AIGEFS 6 hours - https GDAS 6 hours grib filter https GDAS 0.25 6 hours grib filter http"11:29 UTC, 11 Novstated on the page
NOAA NOMADS (NCEP model output)carriesGEFS (NOAA/NCEP)nomads.ncep.noaa.gov: "description of each data access method. Data Set freq grib filter https Global Models AIGFS 6 hours - https AIGEFS 6 hours - https GDAS 6 hours grib filter https GDAS 0.25 6 hours grib filter https GFS 0.25 Degree 6 hour"11:29 UTC, 11 Novstated on the page
NOAA NOMADS (NCEP model output)published byNOAA (NWS, NCEP, NESDIS)nomads.ncep.noaa.gov: "NOMADS at ncep.noaa.gov Home --> HOME Forecast Local Graphical Aviation Marine Rivers and Lakes Hurricanes Severe Weather Fire Weather Space Weather Sun/Moon Long Range Forecasts"11:29 UTC, 11 Novstated on the page
NOAA NOMADS (NCEP model output)is what Open-Meteo takes its data fromOpen-Meteoopen-meteo.com: "Centre for Medium-Range Weather Forecasts ECMWF ( CC-BY Licence ) Atmospheric, ensemble and wave forecasts from NOAA NCEP ( Licence ) Atmospheric and ensemble forecasts from Canadian Meteorological Centre CMC ( Licence )"11:29 UTC, 11 Novstated on the page

Licence: what we may do with it

NOAA / US National Weather Service (GFS, NOMADS, Aviation Weather Center, NHC): US government work: public domain (weather.gov, read 11:30 UTC, 11 Nov, stated on the page).

ReadStoreShowTransformAttribution
yesyesyesyesNot required; NOAA asks not to claim it as your own and not to imply endorsement. We credit "NOAA/NWS".

Do not present modified data as official NWS information.

What it offers for Lisbon and Madeira this week

GFS at 0.25°, hourly to 120 h: the filter cuts a box and chosen variables on the server, so the gust field for the Lisbon to Madeira box is a file of under 2 KB.

  • Endpoint: https://nomads.ncep.noaa.gov/cgi-bin/filter_gfs_0p25.pl
  • Key: none
  • Format: GRIB2
  • Size: a full file is 477 to 513 MB per time step; our cut-out (surface gust, 32 to 40 N, 18 to 8 W, one step) was 1,702 bytes
  • Cadence: four runs a day (00, 06, 12, 18 UTC), on the server about 3.5 to 5 hours after run time (18 UTC run: first file 21:34 UTC)
  • This week (probe read 02:29 UTC, 11 Nov): Read 02:29 UTC: the 18 UTC run of 10 November was there; directories from 1 to 10 November. Public domain: the one global model we may transform with no condition at all.
  • How to read it: filter_gfs_0p25.pl?dir=/gfs.YYYYMMDD/HH/atmos&file=gfs.tHHz.pgrb2.0p25.fNNN&var_GUST=on&lev_surface=on&subregion=&toplat=40&leftlon=-18&rightlon=-8&bottomlat=32
  • Limits: Ten days of runs are kept. Binary: decode outside git. NOAA asks for no more than 120 hits a minute.

Not a warning service: this page explains where data comes from. For warnings follow IPMA and ANEPC.