This table gives some verification statistics, year-by-year, for SPC tornado watches -- based only on tornado occurrences.

YEAR	# of tornado watches	% of tornado watch with tornados	# of tornados	POD tornado in tornado watch	Tornado watch lead time	Median tornado watch area	# of F2 or greater tornados	POD F2 or greater tornados
1970	220	31	653	21	2.24	23479	234	28
1971	274	40	889	33	2.33	25172	320	38
1972	181	43	737	22	2.08	22300	222	32
1973	379	45	1102	35	1.95	24307	386	49
1974	238	48	944	38	2.13	25330	339	54
1975	291	44	919	29	1.93	25362	236	35
1976	212	50	834	33	2.03	24243	231	44
1977	199	48	852	30	2.24	26145	182	40
1978	201	47	789	30	2.21	26190	128	41
1979	208	44	855	30	2.26	23832	150	46
1980	207	51	866	36	2.07	28398	199	44
1981	179	49	782	32	2.16	25885	179	45
1982	257	56	1047	45	2.51	28243	251	58
1983	251	54	931	46	2.31	27741	209	60
1984	223	56	907	48	2.1	28938	182	64
1985	207	51	684	43	2.56	29844	117	63
1986	197	46	763	36	2.21	25205	140	46
1987	156	40	656	28	2.31	25136	77	53
1988	168	48	702	43	2.5	25814	108	69
1989	261	50	856	45	2.44	24893	123	59
1990	314	53	1133	53	2.25	23781	211	72
1991	294	56	1132	51	2.31	24674	149	78
1992	348	52	1297	52	2.34	22696	186	75
1993	350	48	1173	50	2.33	24299	116	71
1994	275	52	1082	47	2.02	23355	116	66
1995	420	48	1234	61	2.17	25986	129	84
1996	479	48	1171	63	2.11	25317	114	72
1997	324	51	1148	54	2.14	24170	124	88
1998	379	58	1426	57	2.05	23760	160	84
1999	255	64	1343	57	1.94	25395	188	89
2000	226	60	1071	40	2.08	23607	85	76

NOTES: %Tor Verf is percent of all tornadoes nationwide in tornado watches. [Severe thunderstorm watches not included.] POD is probability of detection, the percentage of watches containing at least one tornado. Lead T (also "projection time") is the lead time between watch issuance and first tornado report. Median Area is the middle value of all watch areas for the year. The annual counts of reports are number of reports through time verification was calculated, and may not include reports received late.