. Author manuscript; available in PMC: 2022 May 1.

Published in final edited form as: J Hydrometeorol. 2021 May 13;22(5):1333–1350. doi: 10.1175/jhm-d-20-0128.1

Table 2.

Skill scores of the EnKF method (ability to detect rainfall above various thresholds) for the experiments described in Section 6 (precipitation fields from radar).

Rainfall threshold	POD	FAR	TS	FBIAS
> 0.5 mm h⁻¹	0.95	0.32	0.66	1.40
> 2.5 mm h⁻¹	0.91	0.46	0.51	1.68
> 5 mm h⁻¹	0.78	0.50	0.44	1.55
> 10 mm h⁻¹	0.70	0.55	0.37	1.56
> 20 mm h⁻¹	0.61	0.65	0.28	1.76
> 30 mm h⁻¹	0.53	0.72	0.22	1.89

Statistics are calculated cumulatively for 2 events with 10 minutes duration each, 1-minute time step, over a domain with 30×30 ground cells. POD (probability of detection) = hits/(hits + misses); FAR (false alarm ratio) = false alarms/(hits + false alarms); TS (threat score) = hits/(hits + misses + false alarms); FBIAS (frequency bias index) = (hits + false alarms)/(hits + misses).