Support UK radar data by BernardClaxton · Pull Request #1825 · MetOffice/CSET

BernardClaxton (BernardClaxton) · 2025-11-27T11:55:59Z

Contribution checklist

Aim to have all relevant checks ticked off before merging. See the developer's guide for more detail.

Documentation has been updated to reflect change.
New code has tests, and affected old tests have been updated.
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Ensured the pull request title is descriptive.
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Sylvia Bohnenstengel (Sylviabohnenstengel) · 2026-01-20T16:31:03Z

for info if the upgrade of you branch with main causes problems then I have created a branch of your branch and merged main in now including the addition of plotting transverse mercator. So you should be able to plot the radar data.
Branch: #1759_import_nimrod_merge_main

Sylvia Bohnenstengel (Sylviabohnenstengel) · 2026-01-20T18:22:28Z

#https://github.com/MetOffice/CSET/tree/1759_import_nimrod_merge_main adds nimrod radar switch into rose gui and enables nimrod switch in flow.cylc for the workflow.

James Frost (jfrost-mo)

src/CSET/cset_workflow/app/fetch_fcst/bin/fetch_data.py is the main file for this change, as the stuff in fetch_nimrod is largely unused.

What is our plan with this? Are we going to try and reuse the RES capability in cube_utils? Or do we not really need it given the existing capabilities of CSET?

The recipe and such looks broadly sensible, though I think we can get away with hard-coding some more for the initial simple recipe.

github-actions · 2026-01-29T10:53:16Z

Co-authored-by: James Frost <james.frost@metoffice.gov.uk>

This is mostly to satisfy my type checker that nimrod_dir_wei is set when used.

The number of radar sites can change, preventing the cubes from merging. Therefore the respective cube attributes are stripped.

James Frost (jfrost-mo) · 2026-04-20T16:06:46Z

Be warned that plotting spatial plots for 5 minutely data takes ages.

James Frost (jfrost-mo) · 2026-04-21T07:53:50Z

Rainfall rate Composite will also want a colourbar, so the 5 minutely data displays sensibly.

My run: https://wwwspice/~james.frost/CSET-radar-test/

BernardClaxton (BernardClaxton) · 2026-04-24T14:19:44Z

Nimrod 5 minute rainfall rates now plots using the same logarithmic colourbar as the other rainfall plots.

…ite #1759

None of the three constants defined in this file are used. The defined constants are: HOUR_IN_SECONDS = 3600 M_IN_KM = 1000 REAL_MATCH_TOL = 1.0e-4

BernardClaxton (BernardClaxton) added 15 commits October 8, 2025 11:58

add Nimrod radar page to CSET GUI #1759

09b28e4

put nimrod functions in fetch_data.py to grab radar files #1759

af67bf9

added job in cylc workflow to grab nimrod obs #1759

b7eea4a

defined fetchnimrod task as fetch-nimrod.py #1759

0369efb

put in script fetch-nimrod.py #1759

98fb38b

edits to fetch_data.py #1759

450ef6c

edits to fetch-nimrod.py #1759

d6aaf0a

edits to flow-cylc #1759

97c72ad

edits to meta/rose-meta.conf #1759

68b99a7

fetch-nimrod.py update #1759

518c017

constants.py added #1759

1ce6494

added nimrod colorbar #1759

065afab

added rose-meta colorbar #1759

9fe96cd

adding cube_utils

7e146ed

recipe for nimrod #1759

6963f5d

BernardClaxton (BernardClaxton) self-assigned this Nov 27, 2025

BernardClaxton (BernardClaxton) added the enhancement New feature or request label Nov 27, 2025

BernardClaxton (BernardClaxton) requested a review from James Frost (jfrost-mo) November 27, 2025 11:56

BernardClaxton (BernardClaxton) added 3 commits January 20, 2026 14:43

debugging code added to fetch-nimrod.py at L715 #1759

8d73e22

debugging code added to fetch-nimrod.py at L715 #1759

b76224e

Merge remote-tracking branch 'origin/main' into 1759_import_nimrod

671f904

James Frost (jfrost-mo) changed the title ~~supporting UK radar data~~ Support UK radar data Jan 23, 2026

James Frost (jfrost-mo) reviewed Jan 23, 2026

View reviewed changes

Nimrod fetching code moved into fetch_nimrod.py #1759

a63cefc

tidied the Nimrod radio buttons in GUI #1759

a84e98f

Stephen Gallagher (SGallagherMet) added the R2O Trials Items of significance to the Met Office Research to Operations Team. label Feb 16, 2026

rewrote fetch_nimrod.py to output Nimrod data as NetCDF #1759

8102db4

James Frost (jfrost-mo) added 4 commits April 20, 2026 14:44

Update terminology in comments

ee06dda

Co-authored-by: James Frost <james.frost@metoffice.gov.uk>

Remove prints

0733c77

Co-authored-by: James Frost <james.frost@metoffice.gov.uk>

Clean up radar recipe files

78ff5aa

Create directory for weights when needed

7e8590b

This is mostly to satisfy my type checker that nimrod_dir_wei is set when used.

James Frost (jfrost-mo) force-pushed the 1759_import_nimrod branch from 9bb07f8 to 7e8590b Compare April 20, 2026 13:48

Merge branch 'main' into 1759_import_nimrod

f671af7

James Frost (jfrost-mo) reviewed Apr 20, 2026

View reviewed changes

Comment thread src/CSET/cset_workflow/meta/observations/rose-meta.conf

James Frost (jfrost-mo) added 5 commits April 20, 2026 15:49

Add NIMROD normalisation callback

4c7b118

The number of radar sites can change, preventing the cubes from merging. Therefore the respective cube attributes are stripped.

Add configuration for 5 minute rainfall rate

ac824fb

Rearrange loader to use simpler structure

785ffc7

Add 5 minute rainfall rate to loader

7453503

Remove troublesome attributes from 5 minute rainrate cubes

0f960ff

BernardClaxton (BernardClaxton) added 3 commits April 23, 2026 15:58

changed Composite to composite in name of Nimrod_5min variable #1759

4e72b1a

Added entry in _colorbar_definition.json for Nimrod_5min data #1759

d87bcd2

Added log rainfall colorbar for Nimrod_5min 2-D field plots #1759

3c6a742

BernardClaxton (BernardClaxton) added 11 commits April 29, 2026 08:29

Changed the varname for Nimrod 5min data back to Rainfall rate Compos…

0926bbc

…ite #1759

Changed the Nimrod Rose GUI buttons to boolean #1759

dbfc638

Tidied logic handling of the Nimrod toggles #1759

f4ab1f9

Removed commented out Nimrod lines in rose-meta.conf #1759

e21cbe1

Updated comments for retrieve_nimrod #1759

204b43a

Delete src/CSET/cset_workflow/app/fetch_nimrod/bin/constants.py

21360fd

None of the three constants defined in this file are used. The defined constants are: HOUR_IN_SECONDS = 3600 M_IN_KM = 1000 REAL_MATCH_TOL = 1.0e-4

Implemented plotting of Nimrod accumulation weight fields #1759

dff633b

Changed an except from Exception to FileNotFoundError #1759

aedd1de

Refactored fetch_nimrod.py #1759

39dbaa7

Corrected the time stepping in fetch_nimrod.py #1759

ecb4c0a

Change the units for Nimrod weights to dimensionless #1759

6cf3503

James Frost (jfrost-mo) self-requested a review May 1, 2026 15:43

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Support UK radar data#1825

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BernardClaxton (BernardClaxton) wants to merge 71 commits intomainfrom
1759_import_nimrod

BernardClaxton (BernardClaxton) commented Nov 27, 2025 •

edited by jfrost-mo

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BernardClaxton (BernardClaxton) commented Nov 27, 2025 •

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