7 ms·

Does anyone know of any weather sites which show the actual outcomes? It is very easy to find forecasts. It is quite difficult to find what the weather actual

Does anyone know of any weather sites which show the actual outcomes? It is very easy to find forecasts. It is quite difficult to find what the weather actually was on a given day at a location, but at least it is possible. I have never seen a site that shows the predicted weather for a day alongside the actual weather for that day. I presume professional meteorologists know where to look for this data, but for the rest of us, it feels like it is hidden. I know no one wants to advertise their mistakes, but showing a history of your accuracy which was transparently updated would build more credibility with the public than anything else. Perhaps someone is scraping this info and posting it?

deleted 1y ago
[deleted]
nerdralph 1y ago
Environment Canada has hourly historical data for many stations. Some may be daily. https://climate.weather.gc.ca/historical_data/search_historic_data_e.html https://climate.weather.gc.ca/historical_data/search_histori...
lif 1y ago
agree. Even a site that displays 'just' recent weather specifics (sans how the forecast was) would be quite helpful. e.g., the hourly precipitation for the last week or month. Am NOT talking about generalized monthly climate data, fwiw. Anyone?
- grigri907 1y ago
  University of Iowa has a service to aggregate this sort of thing. It's CSV format, but otherwise seems like what you're looking for? https://mesonet.agron.iastate.edu/request/download.phtml https://mesonet.agron.iastate.edu/request/download.phtml
havaloc 1y ago
Somewhat related: Before launching our new long range (5 day) turbulence forecast tool (for nervous flyers), we spent time experimenting to see how far out we could reliably predict turbulence. Once we had something promising, we started posting daily snapshots—each showing the forecast from five days earlier alongside what actually happened. The model updates continuously, and we’ve kept the process public to demonstrate how well it works, not just claim it does. https://www.turbulenceforecast.com/drift https://www.turbulenceforecast.com/drift
sunshinesnacks 1y ago
This NOAA National Blend of Models (NBM) viewer lets you enable observations and then roll back the forecast initialization date to see forecasts and observations at the same time. It’s experimental, and selecting weather stations is a little clunky, but it has some really cool info that’s hard to find other places. https://apps.gsl.noaa.gov/nbmviewer/?col=2&hgt=1&obs=true&fontsize=1&location=KGEG&selectedgroup=Default&darkmode=on&graph=fa-chart-bar&probfield=Tmax&proboperator=%3E%3D&probvalue=40&colorfriendly=false&whiskers=false&boxes=true&median=false&det=true&tz=local https://apps.gsl.noaa.gov/nbmviewer/?col=2&hgt=1&obs=true&fo... Edit: This GEFS plume viewer is cool, too. https://www.emc.ncep.noaa.gov/users/meg/gefs_plumes/index.html?stationname=KEET https://www.emc.ncep.noaa.gov/users/meg/gefs_plumes/index.ht... You can check a box to plot observations and then pick an older “cycle”. Both are limited to the US.
BrenBarn 1y ago
I have wondered this for years. Several times I looked for a dataset of historical forecasts. It seems wild that with all the data available out there, there's no go-to source that has past forecasts together with the actual recorded data for each day. That said, these posts do mention some sources: https://opendata.stackexchange.com/questions/2009/historical-weather-forecasts https://opendata.stackexchange.com/questions/2009/historical... https://www.reddit.com/r/meteorology/comments/1crs6lu/seeking_historical_forecast_data/ https://www.reddit.com/r/meteorology/comments/1crs6lu/seekin... (These aren't "sites" that display the past data, just datasets you can download.)
Leftium 1y ago
One challenge is the forecast is constantly updated, as often as several times in a single day. So which forecast would you use for the predicted weather? On https://weather-sense.leftium.com https://weather-sense.leftium.com, you can see the daily forecasts change on a regular basis.

deleted 1y ago

[deleted]

nerdralph 1y ago

Environment Canada has hourly historical data for many stations. Some may be daily. https://climate.weather.gc.ca/historical_data/search_historic_data_e.html https://climate.weather.gc.ca/historical_data/search_histori...

lif 1y ago

agree. Even a site that displays 'just' recent weather specifics (sans how the forecast was) would be quite helpful. e.g., the hourly precipitation for the last week or month. Am NOT talking about generalized monthly climate data, fwiw. Anyone?

grigri907 1y ago
University of Iowa has a service to aggregate this sort of thing. It's CSV format, but otherwise seems like what you're looking for? https://mesonet.agron.iastate.edu/request/download.phtml https://mesonet.agron.iastate.edu/request/download.phtml

havaloc 1y ago

Somewhat related: Before launching our new long range (5 day) turbulence forecast tool (for nervous flyers), we spent time experimenting to see how far out we could reliably predict turbulence. Once we had something promising, we started posting daily snapshots—each showing the forecast from five days earlier alongside what actually happened. The model updates continuously, and we’ve kept the process public to demonstrate how well it works, not just claim it does. https://www.turbulenceforecast.com/drift https://www.turbulenceforecast.com/drift

sunshinesnacks 1y ago

This NOAA National Blend of Models (NBM) viewer lets you enable observations and then roll back the forecast initialization date to see forecasts and observations at the same time. It’s experimental, and selecting weather stations is a little clunky, but it has some really cool info that’s hard to find other places. https://apps.gsl.noaa.gov/nbmviewer/?col=2&hgt=1&obs=true&fontsize=1&location=KGEG&selectedgroup=Default&darkmode=on&graph=fa-chart-bar&probfield=Tmax&proboperator=%3E%3D&probvalue=40&colorfriendly=false&whiskers=false&boxes=true&median=false&det=true&tz=local https://apps.gsl.noaa.gov/nbmviewer/?col=2&hgt=1&obs=true&fo... Edit: This GEFS plume viewer is cool, too. https://www.emc.ncep.noaa.gov/users/meg/gefs_plumes/index.html?stationname=KEET https://www.emc.ncep.noaa.gov/users/meg/gefs_plumes/index.ht... You can check a box to plot observations and then pick an older “cycle”. Both are limited to the US.

BrenBarn 1y ago

I have wondered this for years. Several times I looked for a dataset of historical forecasts. It seems wild that with all the data available out there, there's no go-to source that has past forecasts together with the actual recorded data for each day. That said, these posts do mention some sources: https://opendata.stackexchange.com/questions/2009/historical-weather-forecasts https://opendata.stackexchange.com/questions/2009/historical... https://www.reddit.com/r/meteorology/comments/1crs6lu/seeking_historical_forecast_data/ https://www.reddit.com/r/meteorology/comments/1crs6lu/seekin... (These aren't "sites" that display the past data, just datasets you can download.)

Leftium 1y ago

One challenge is the forecast is constantly updated, as often as several times in a single day. So which forecast would you use for the predicted weather? On https://weather-sense.leftium.com https://weather-sense.leftium.com, you can see the daily forecasts change on a regular basis.