Corrigendum to: Circular Flip-Flop Index: quantifying revision stability of forecasts of direction

Deryn Griffiths; Nicholas Loveday; Benjamin Price; Michael Foley; Alistair McKelvie

doi:10.1071/ES21010_CO

CORRIGENDUM (Open Access)

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Corrigendum to: Circular Flip-Flop Index: quantifying revision stability of forecasts of direction

Deryn Griffiths , Nicholas Loveday , Benjamin Price , Michael Foley and Alistair McKelvie

Journal of Southern Hemisphere Earth Systems Science 75, ES21010_CO https://doi.org/10.1071/ES21010_CO

Published: 29 May 2025

© 2025 The Author(s) (or their employer(s)). Published by CSIRO Publishing on behalf of the Bureau of Meteorology. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

This corrigendum corrects Journal of Southern Hemisphere Earth Systems Science 71(3) 266–271. doi:10.1071/ES21010

The authors of the above-mentioned paper regret to inform readers that the two values of 30 in the bottom row in Table 1 were incorrect in the published version of this paper. Those values should instead be 16. This is corrected below (highlighted cells):

Table 1.

Forecast sequences for wind direction and corresponding Circular Flip-Flop Index calculations. Forecast f_i was issued i days prior to the validity period of the forecast.

	Official forecasts for Melbourne Airport valid 0000 UTC 27 December 2020	Synthetic Example 1	Synthetic Example 2	Synthetic Example 3	Synthetic Example 4
Direction (°)
f₇	9	50	340	360	360
f₆	341	80	10	40	80
f₅	354	70	360	80	360
f₄	353	120	50	120	240
f₃	5	110	40	160	320
f₂	1	100	30	200	80
f₁	359	60	350	240	360
$\| \underset{i}{Sector} (f_{i}) \| (\circ)$
f_i in {f₅, f₆, f₇}	28	30	30	80	80
f_i in {f₁, f₂, f₃}	6	50	50	80	80
f_i in {f₁, f₂, f₃, f₄, f₅, f₆, f₇}	28	70	70	240	200
Circular Flip-Flop Index (°)
For sequence f₅, f₆, f₇	13	10	10	0	80
For sequence f₁, f₂, f₃	0	0	0	0	80
For sequence f₁, f₂, f₃, f₄, f₅, f₆, f₇	6.4	16	16	12	76

Thank you to Philip Gill and Clare Bysouth from The Met Office for alerting us to the error.

We apologise for these errors and any confusion their inclusion may have caused.

Corrigendum to: Circular Flip-Flop Index: quantifying revision stability of forecasts of direction

Forecast sequences for wind direction and corresponding Circular Flip-Flop Index calculations. Forecast fi was issued i days prior to the validity period of the forecast.

Forecast sequences for wind direction and corresponding Circular Flip-Flop Index calculations. Forecast f_i was issued i days prior to the validity period of the forecast.