Questions tagged [weather-forecasting]
Questions about the application of weather data in meteorology/forecasting.
178 questions
0 votes
1 answer
201 views
How can humidity drop as it rains?
A Washington DC meteorologist on WTOP radio said that the humidity will continue to drop despite it raining this afternoon. How does that work? Is it normal? It was on Saturday September 6, 2025 ...
1 vote
0 answers
42 views
How to interpret GFS accumulated precipitation
I'm currently looking into some rainfall forecast data obtained from NCEI's Global Forecasting System (GFS) model. Since this is my first time making use of such a dataset, I'm a bit confused on how ...
- 11
0 votes
1 answer
78 views
What's more important for weather, location or time?
Let's say we have a set of forecasts. None of them is 100% relevant. Some may be outdated, some are related to a different city. We want to predict the weather in the current spot. What would we ...
- 101
2 votes
1 answer
136 views
Suggestion for data analysis with meteorological data
not sure if this is the right place or not to ask for advise about my issue, if not sorry you can close this post. I have a project at university where I have to analyse a dataset with meteorological ...
- 121
2 votes
1 answer
81 views
Pressure levels and heights levels
I am a newbie, so bear with me. I was looking into AI driven weather predictions model, and in particular Nvidia StormCast. Looking at the ERA5 variables used to train the model I got confused. Almost ...
- 21
5 votes
1 answer
711 views
Local accuracy of the daily precipitation forecast
I'm currently evaluating the accuracy of available weather models (e.g., ECMWF forecasts as provided by windy.com and open-meteo.com) as part of a side project. I’m not a weather expert, but I'm ...
- 53
1 vote
1 answer
83 views
Forecasting cloud vista for sunset
Mostly for coding fun, and also because I appreciate the clouds, I am wondering, how could one forecast that clouds will form a beautiful scenery in the sky? Ideally, I would like to derive it from ...
- 61
3 votes
1 answer
196 views
Complete list of Environment Canada weather stations in Ontario
Where does Environment Canada have weather stations in Ontario? Specifically, weather stations that are used to create Environment Canada weather forecasts. There is a map on this page: https://...
- 141
1 vote
1 answer
149 views
What is Hardest to Forecast / Most Likely to be Forecast Wrong, and Easiest / Most Likely to be Right? [closed]
Among the common weather forecast variables: Temperature Wind Speed Wind Direction Precipitation Cloud coverage ... other variables? Which ones are the most robust when forecast and which ones are ...
- 119
0 votes
1 answer
132 views
Rainfall Rate - unit conversion
when converting the Rainfall Rate unit from mm per HR (Sq. m) to inch per HR (Sq. ft) why are they multiplying by 25.4 only and not considering the conversion from m2 to ft2 for example mm/m2 --> ...
- 3
1 vote
0 answers
147 views
What is root mean squared bias?
I've stumbled across this publication in nature (Neural general circulation models for weather and climate) where the authors test an AI driven weather forecast model against ECWMF's ensemble forecast....
- 121
1 vote
1 answer
149 views
Up to what radius/distance/area maximum do weather parameters remain constant?
Up to what radius/distance/area maximum do weather parameters remain constant? For example, precipitation is so variable that it can vary even within a few meters, while sunshine durations may not ...
1 vote
0 answers
51 views
What does the SST field represent in the GFS forecast/ analysis?
What does the SST field represent in the GFS forecast/ analysis? For example, in the ERA5 reanalysis product, the SST is a foundation SST taken from the OSTIA. Similarly, what is the SST in GFS? Is it ...
0 votes
0 answers
273 views
NCEP GFS data products: ANL and FH000
I'm confused with the GFS model data products, presented at NCEP Products Inventory website. There are two types of products for analysis: ANL ("**.anl") and FH000 ("*.f000"). As ...
- 101
1 vote
0 answers
33 views
How is cloud column water calculated in GDAS model files?
The question NOAA helpfully provides model outputs from the Global Data Assimilation System (GDAS) for the past 10 days (https://nomads.ncep.noaa.gov/pub/data/nccf/com/gfs/prod/). Products include ...
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