<p>There is no traceable uncertainty associated with each datum in the ERA-Interim reanalysis.</p>

<p><strong>However</strong>, in ERA-5 there is an <em>ensemble</em>.  This multiplies the data volume, but it means you can use the spread between the ensemble members to get an estimate.  See <a href="https://confluence.ecmwf.int//display/CKB/What+is+ERA5" rel="noreferrer">ERA-5 page</a>.  ECMWF want us to use ERA-5 now anyway.</p>

CC BY-SA 4.0
2021-11-30T11:39:23.440Z
That page doesn't exist anymore, but there's this: https://confluence.ecmwf.int/display/CKB/ERA5%3A+uncertainty+estimation?searchId=HC1ESI8OY . There's a good paragraph there that describes the uncertainty that could be useful as a quote.
naught101
CC BY-SA 4.0
2018-07-27T09:08:32.767Z
2018-07-27T09:08:32.767Z
gerrit
<p>Greeting,
What is the estimated uncertainty value in Temperature, relative humidity, U and V winds of ERA-Interim data?</p>

CC BY-SA 4.0
2018-07-27T07:25:05.307Z
Do they make such estimations?
Communisty
<meteorology><climate-models><era>
Uncertainty In ERA-Interim data
SUNNY KANT
# Uncertainty In ERA-Interim data

(Asked by: username_0 on 2018-07-27)

Greeting,
What is the estimated uncertainty value in Temperature, relative humidity, U and V winds of ERA-Interim data?

**Tags:** meteorology, climate-models, era

> **Comments:**
> **username_1**: Do they make such estimations?  

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## 1 answers

### Answer by username_2 on 2018-07-27. Score: 5

There is no traceable uncertainty associated with each datum in the ERA-Interim reanalysis.

**However**, in ERA-5 there is an *ensemble*. This multiplies the data volume, but it means you can use the spread between the ensemble members to get an estimate. See [ERA-5 page](https://confluence.ecmwf.int//display/CKB/What+is+ERA5). ECMWF want us to use ERA-5 now anyway.

> **Comments:**
> **username_3**: That page doesn't exist anymore, but there's this: https://confluence.ecmwf.int/display/CKB/ERA5%3A+uncertainty+estimation?searchId=HC1ESI8OY . There's a good paragraph there that describes the uncertainty that could be useful as a quote.  

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