Pressure Gradient and CESO - Rules of Thumb - Winter Conditions (South Winds)

Period of record - 13 years - January 1995 to January 2008

Gradient Condition
Percentage of time meeting CESO
Cases
When ACV-SBA > 15 MB

(114 cases)
76 % of the time CESO > 50 K (~100 SO)
87 of 114
45% of the time CESO > 100K (~200 SO)
51 of 114
When ACV-SBA > 20 MB

(36 cases)
97 % of the time CESO > 50 K (~100 SO)
35 of 36
89% of the time CESO > 100K (~200 SO)
32 of 36
42% of the time CESO > 250K (~500 SO)
15 of 36

 

Gradient Condition
Percentage of time meeting CESO
Cases
When ACV-SFO > 11 MB

(79 cases)
63 % of the time CESO > 50 K (~100 SO)
50 of 79
41% of the time CESO > 100K (~200 SO)
32 of 79
When ACV-SFO > 13 MB

(30 cases)
83 % of the time CESO > 50 K (~100 SO)
25 of 30
60% of the time CESO > 100K (~200 SO)
18 of 30
27% of the time CESO > 250K (~500 SO)
8 of 30

 

Gradient Condition
Percentage of time meeting CESO
Cases
When SFO>SBA 10 MB

(69 cases)
81 % of the time CESO > 50 K (~100 SO)
56 of 69
65% of the time CESO > 100K (~200 SO)
45 of 69
When SFO>SBA 13 MB

(24 cases)
100 % of the time CESO > 50 K (~100 SO)
14 of 14
92% of the time CESO > 100K (~200 SO)
22 of 24
54% of the time CESO > 250K (~500 SO)
13 of 24

 

Gradient Condition
Percentage of time meeting CESO
Cases
When STS-SJC > 5 MB

(52 cases)
63 % of the time CESO > 50 K (~100 SO)
33 of 52
52% of the time CESO > 100K (~200 SO)
27 of 52
When STS-SJC> 6 MB

(15 cases)
100 % of the time CESO > 50 K (~100 SO)
15 of 15
87% of the time CESO > 100K (~200 SO)
13 of 15
53% of the time CESO > 250K (~500 SO)
8 of 15


(MFR - SAC gradient is mainly included to show how poorly it does compared with the other locations)
Gradient Condition
Percentage of time meeting CESO
Cases
When MFR-SAC > 10 MB

(199 cases)
39 % of the time CESO > 50 K (~100 SO)
77 of 199
20% of the time CESO > 100K (~200 SO)
40 of 199
When MFR-SAC > 15 MB

(36 cases)
67 % of the time CESO > 50 K (~100 SO)
24 of 36
49% of the time CESO > 100K (~200 SO)
17 of 36
22% of the time CESO > 250K (~500 SO)
8 of 36

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