Bay Area Storm Index (BASI) ARCHIVE (updated 2/7/2024) Jan Null, CCM Golden Gate Weather Services

All Storms greater than BASI 6.0 since 1950

		SF City		SFO Max		Bay Area Max
		24-hour Rain		Sustained Wind		Wind Gust*
Date	BASI	in.	pts	mph	pts	mph	pts
2/4/2024	9.1	1.60	3.1	41	3.0	102	3.0
1/31/2024	7.75	2.56	4.0	25	1.5	73	2.25
1/4/2023	7.0	1.06	1.2	38	2.8	101	3.0
12/31/2022	7.1	4.56	4.0	26	1.6	53	1.5
12/27/2022	7.7	1.61	3.1	36	2.6	63	2.0
12/13/2021	8.3	2.56	4.0	33	2.3	61	2.0
10/24/2021	9.7	4.02	4.0	41	3.0	86	2.8
2/13/2019	8.7	2.49	3.9	33	2.3	84	2.5
1/16/2019	6.7	1.14	1.4	39	2.9	75	2.4
2/20/2017	6.3	1.84	3.3	25	1.5	53	1.5
1/8/2017	8.2	1.46	2.8	44	3.0	77	2.4
12/11/2014	8.2	3.40	4.0	29	1.9	71	2.3
3/24/2011	7.3	1.56	3.0	33	2.3	61	2.0
12/28/2010	6.7	1.30	2.2	35	2.5	60	2.0
10/13/2009	9.3	2.48	3.9	41	3.0	77	2.4
1/4/2008	9.2	2.01	3.5	53	3.0	87	2.7
2/27/2006	7.9	1.29	2.0	55	3.0	97	2.9
12/31/2005	9.2	2.80	4.0	38	2.8	77	2.4
12/18/2005	8.9	2.99	4.0	36	2.6	71	2.3
12/1/2005	7.1	1.16	1.6	43	3.0	81	2.5
2/25/2004	8.6	2.01	3.5	38	2.8	73	2.3
1/1/2004	8.6	1.84	3.3	44	3.0	72	2.3
12/29/2003	7.9	2.15	3.6	33	2.3	61	2.0
12/16/2002	9.3	2.07	3.5	43	3.0	91	2.8
11/7/2002	8.7	1.47	2.8	40	3.0	96	2.9
12/2/2001	8.8	2.14	3.6	38	2.8	76	2.4
12/1/2001	7.8	2.00	3.5	32	2.2	65	2.1
2/14/2000	9.3	2.50	4.0	39	2.9	79	2.4
2/3/1998	8	3.00	4.0	30	2.0	60	2.0
1/1/1997	8.3	2.00	3.5	35	2.5	70	2.3
1/16/1996	6.6	1.27	2.0	35	2.5	69	2.1
12/12/1995	10	3.27	4.0	54	3.0	108	3.0
12/11/1995	9.7	3.61	4.0	43	3.0	85	2.7
3/22/1995	6.6	1.28	2.0	35	2.5	69	2.1
1/10/1995	6.8	1.33	2.2	35	2.5	69	2.1
1/13/1993	8.4	1.94	3.4	37	2.7	74	2.3
2/16/1990	8.6	1.40	2.6	55	3.0	110	3.0
2/13/1987	8.6	2.22	3.7	36	2.6	71	2.3
2/18/1986	9	1.87	3.3	44	3.0	87	2.7
2/17/1986	8.8	1.68	3.1	44	3.0	87	2.7
2/16/1986	8.2	1.74	3.2	37	2.7	74	2.3
2/15/1986	8.8	1.88	3.3	41	3.0	83	2.5
2/14/1986	9.2	1.83	3.3	48	3.0	97	2.9
2/8/1985	7.8	1.70	3.2	35	2.5	69	2.1
11/12/1984	7.7	1.68	3.1	35	2.5	69	2.1
12/22/1982	9.3	2.00	3.5	47	3.0	94	2.8
3/31/1982	9.5	2.57	4.0	40	3.0	81	2.5
11/13/1981	8.3	1.43	2.6	45	3.0	89	2.7
1/21/1967	9.2	2.45	3.9	39	2.9	78	2.4
1/20/1964	9.1	1.86	3.3	45	3.0	90	2.8
1/31/1963	7.3	1.26	2.0	39	2.9	78	2.4
1/30/1963	9.3	1.87	3.3	51	3.0	101	3.0
10/13/1962	9.5	3.56	4.0	41	3.0	83	2.5
10/12/1962	9.7	3.11	4.0	43	3.0	86	2.7
12/1/1960	8.8	1.68	3.1	44	3.0	87	2.7
9/18/1959	8.4	2.01	3.5	36	2.6	71	2.3
1/5/1959	7.2	1.44	2.6	35	2.5	69	2.1
1/12/1957	6.8	1.25	1.8	37	2.7	74	2.3
12/23/1955	9.1	2.18	3.6	41	3.0	83	2.5
12/22/1955	9.8	2.57	4.0	42	3.0	90	2.8
1/14/1952	8.7	1.71	3.2	41	3.0	83	2.5
12/3/1951	8.2	1.58	3.0	38	2.8	76	2.4
12/1/1951	8.7	1.59	3.0	43	3.0	85	2.7
11/18/1950	8.2	1.88	3.3	36	2.6	71	2.3

Criteria Used to Calculate BASI

* below 1500' elevation
return too Bay Area Storm Index

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