Bay Area Storm Index
San Francisco City 24 Hour Max Precip   in
San Francisco Airport Sustained Wind   mph
Bay Area Peak Wind(Below 1500 ft)   mph

Bay Area Storm Index:

Minor System:

  • San Francisco Rain < 1.00"

  • San Francisco Airport Wind < 20 mph

  • Maximum Bay Area Wind < 40 mph


    Bay Area Storm Index is based on following criteria: Points:

    San Francisco Rain

    SF Airport Wind

    Max Bay Area Wind

    Criteria Points
    2.50" or more4
    2.40" to 2.49"3.9
    2.30" to 2.39"3.8
    2.20" to 2.29"3.7
    2.10" to 2.19"3.6
    2.00" to 2.09"3.5
    1.90" to 1.99"3.4
    1.80" to 1.89"3.3
    1.70" to 1.79"3.2
    1.60" to 1.69"3.1
    1.50" to 1.59"3.0
    1.45" to 1.49"2.8
    1.40" to 1.44"2.6
    1.35" to 1.39"2.4
    1.30" to 1.34"2.2
    1.25" to 1.29"2.0
    1.20" to 1.24"1.8
    1.15" to 1.19"1.6
    1.10" to 1.14"1.4
    1.05" to 1.09"1.2
    1.00" to 1.04"1.0
    0.95" to 0.99"0.9
    0.90" to 0.94"0.8
    0.85" to 0.89"0.7
    0.80" to 0.84"0.6
    0.75" to 0.79"0.5
    CriteriaPoints
    40 mph or more 3
    392.9
    382.8
    372.7
    362.6
    352.5
    342.4
    332.3
    322.2
    312.1
    302
    291.9
    281.8
    271.7
    261.6
    251.5
    241.4
    231.3
    221.2
    211.1
    201
    CriteriaPoints
    100 mph or more3
    95 mph to 99 mph2.875
    90 mph to 94 mph2.75
    85 mph to 89 mph2.675
    80 mph to 84 mph2.5
    75 mph to 79 mph2.375
    70 mph to 74 mph2.25
    65 mph to 69 mph2.125
    60 mph to 64 mph2.0
    55 mph to 59 mph1.75
    50 mph to 54 mph1.5
    45 mph to 49 mph1.25
    40 mph to 44 mph1.00
    Less than 40 mph0