<p>Your question is extremely broad and it would be comprehensive to answer in detail.
How it is done varies from one application to another. But in general, all weather forecasts come from a numerical prediction which is based on an analysis. The analysis is created by combining a prior (the previous forecast) with observations. There are many ways this can be implemented in practice. If you are interested you can start by looking up sequential assimilation and variational assimilation.</p>

<p>Some applications apply a Kalman Filter (a recursive method) to update a forecast when new observations come in, but this is probably becoming less relevant as models start to be run in rapid update cycles, e.g. a new analysis (and forecast) every 10-60 minutes. The weather model itself is a big subject in its own, with numerical approximations, optimisation and parameterisations.</p>

CC BY-SA 4.0
2019-11-20T09:57:35.183Z
2019-11-20T09:57:35.183Z
Whir
<p>Given the proprietary nature of that information, I don't think that can really be answered. </p>

<p>But my best guess is that it may be updated by a computer, and adjusted by a meteorologist to better align with observations. There is probably some algorithm that mediates between the two.</p>

CC BY-SA 4.0
2019-11-19T15:41:56.380Z
2019-11-19T15:41:56.380Z
BarocliniCplusplus
<p>Are weather forecasts such as on weather.com or other apps continuously updated for each location and updated by an operator or is it just a computer automatically updating the forecast?</p>

CC BY-SA 4.0
2019-11-20T10:28:36.287Z
you might take a look here http://discovermagazine.com/2019/septemberoctober/weathering-the-storm to understand the basics.
trond hansen
<weather-forecasting><weather-satellites>
Weather Forecasts
Ryan Amalfitano
# Weather Forecasts

(Asked by: username_0 on 2019-11-18)

Are weather forecasts such as on weather.com or other apps continuously updated for each location and updated by an operator or is it just a computer automatically updating the forecast?

**Tags:** weather-forecasting, weather-satellites

> **Comments:**
> **username_1**: you might take a look here http://discovermagazine.com/2019/septemberoctober/weathering-the-storm to understand the basics.  

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## 2 answers

### Answer by username_2 on 2019-11-20. Score: 1

Your question is extremely broad and it would be comprehensive to answer in detail.
How it is done varies from one application to another. But in general, all weather forecasts come from a numerical prediction which is based on an analysis. The analysis is created by combining a prior (the previous forecast) with observations. There are many ways this can be implemented in practice. If you are interested you can start by looking up sequential assimilation and variational assimilation.

Some applications apply a Kalman Filter (a recursive method) to update a forecast when new observations come in, but this is probably becoming less relevant as models start to be run in rapid update cycles, e.g. a new analysis (and forecast) every 10-60 minutes. The weather model itself is a big subject in its own, with numerical approximations, optimisation and parameterisations.


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### Answer by username_3 on 2019-11-19. Score: 0

Given the proprietary nature of that information, I don't think that can really be answered.

But my best guess is that it may be updated by a computer, and adjusted by a meteorologist to better align with observations. There is probably some algorithm that mediates between the two.


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