<Back to Archives>

<Back to Main Menu>

NOVEMBER 2000 Wx Summary

I hope you might remember a now-distant post earlier this fall, where Pacifica had been experiencing a continuing, and progressively colder pattern of bringing cutoff lows down the coast on a near N-S axis. The actual beginning of this pattern using 20-20 hindsight appears to have started way back in Sept. The cold air constantly funneling south produced by far the coldest Nov. in my records. Pacifica's mean temp for Nov. was 51.9F.  By comparison, in 1997, I only recorded three days with lo temps below 50F for the entire month. A "typical" Nov. mean is 54-56F. A small difference perhaps temp wise, but the mitigating influence of the ocean on local temps is strong..so any time mean temps fall below SST's (56-58F locally), an anomolous pattern is at work.  My lo for the month was 40F  on the 13th, with heavy ice on cars/lawns due in part to extremely still air and remnants of frigid northern air pulled down by a series of upper lows diving N-S down the coast. Lows at night were in the mid/lo 40's from 6th - 18th. Heavy frosts  were frequent and light freezes occurred  with four straight days of ice/frost from the 10th through the 15th. Golden Gate Park in San Francisco reported a low of 31 degrees on the 12th. The same morning, we had to delay teeing off for my regular Sun. golf (dawn patrol) due to "frost" on the greens. The 18th fairway was so heavily frosted it looked like a snowfall. The golf course is adjacent to the coastline, and moist sea air must have infiltrated about 300 yards inland, then froze on the grass. The 15th fairway alongside was 100 yards closer to the ocean, and virtually frost free. A most beautiful and unusual sight anytime of the year to be sure.... But to have it happen in the beginning of November?. So guess what? The xact same conditions on the following Sat(11/18)!!!! If anything, the frost was heavier..and the temp back in the canyon on the 6th hole at 8:15 was 34F. Usually, our rainy season is just starting to get started by now as lows pelt the NW and tails/troughs drags down the coast..with mavericks dipping farther south. Thanksgiving in 1980 brought 78mph wind to Pacifica (I remember..lost a good portion of my roof)..and as a youngster, I can remember many blustery, early season  storms this time of year...but never the bone chilling cold like we've seen on/off for the last six weeks. Snow was falling as low as 2,000' locally, and unofficial reports had flurries falling in parts of San Francisco (elev. 1,100'). Despite the wild, crazy weather that often accompanies upper lows in the near vicinity, by month's end only .80" of rain fell despite 6 days of rain and 6 other with trace amounts. The coldness and dryness of the continental airmass over us at the surface, coupled with a strong inversion layer under an increasing SW flow aloft, also resulted in widespread tule fog developing in the inland valleys.  Not an unfamiliar pattern associated with such a large dry airmass diving down to the equator ....storms to the north starve for moisture.

                   MONTHLY CLIMATOLOGICAL SUMMARY for NOV. 2000


NAME: HOME CITY: Pacifica  STATE: Ca  ELEV: 540'  LAT: 37.36'N  LONG: 122.27'W 


                   TEMPERATURE (°F), RAIN  (in), WIND SPEED (mph)


                                      HEAT  COOL        AVG
    MEAN                              DEG   DEG         WIND                 DOM
DAY TEMP  HIGH   TIME   LOW    TIME   DAYS  DAYS  RAIN  SPEED HIGH   TIME    DIR
------------------------------------------------------------------------------------
 1  53.1  60.0   2:15p  47.5   7:30a  11.3   0.0  0.01   1.3  10.0   3:00p     E
 2  55.2  64.1   1:15p  49.4   7:30a   8.3   0.0  0.00   1.2   9.0  12:15p   SSW
 3  61.2  70.0   3:30p  54.2  12:15a   2.9   0.0  0.00   3.4  18.0   4:30a   NNE
 4  54.9  61.6   1:00p  51.3   8:15a   8.6   0.0  0.00   2.1  11.0   3:45p   SSW
 5  54.7  59.1   2:00p  52.4   7:45a   9.3   0.0  0.00   3.0  20.0   9:30p   SSW
 6  54.1  60.0   2:15p  49.7  11:30p  10.2   0.0  0.00   3.5  19.0   4:45a     N
 7  57.3  66.0   1:15p  48.9  12:45a   7.5   0.0  0.00   3.4  20.0   1:45a     N
 8  52.1  56.0   3:30p  48.6   4:45a  12.7   0.0  0.01   2.9  20.0   3:00p     W
 9  51.3  56.5   1:15p  48.6   7:00a  12.5   0.0  0.00   4.3  24.0   3:30a   WNW
10  49.2  55.7   2:30p  44.3  12:00m  15.0   0.0  0.01   1.8  12.0   2:15p     S
11  47.5  55.4   4:45p  42.5   3:30a  16.0   0.0  0.00   1.6  14.0  11:15a     N
12  48.6  57.8   1:45p  42.3   4:45a  15.0   0.0  0.00   1.2   9.0   2:00p   NNE
13  46.4  53.9   1:00p  40.5   7:00a  17.8   0.0  0.10   2.6  22.0  12:45p   SSE
14  47.2  54.9   2:30p  42.6   6:45a  16.3   0.0  0.01   1.3  13.0   1:45p   ESE
15  50.0  56.4   2:30p  44.3   1:45a  14.7   0.0  0.05   0.9  13.0   1:00p   NNW
16  49.1  55.2   3:30p  44.3  12:00m  15.3   0.0  0.04   2.8  18.0   2:00p   NNE
17  50.2  58.6   3:30p  43.7   1:30a  13.8   0.0  0.00   2.5  15.0  11:00a   SSW
18  50.7  60.8   2:15p  44.2   8:00a  12.5   0.0  0.00   1.3  13.0  12:15p    SE
19  51.7  60.1   4:15p  46.3   7:30a  11.8   0.0  0.00   2.2  13.0  12:45p   SSW
20  52.0  60.9   1:45p  46.9   8:00a  11.1   0.0  0.00   2.3  16.0  12:00p     N
21  52.4  57.0   3:30p  48.0  12:15a  12.5   0.0  0.19   1.5  12.0   4:15p     N
22  51.0  56.1   3:45p  48.1  10:00p  12.9   0.0  0.00   2.0  13.0   7:15a   SSW
23  51.5  55.9   4:00p  47.0   7:45a  13.5   0.0  0.00   1.3  10.0  10:45a     N
24  52.2  57.5   4:00p  46.3  12:00m  13.1   0.0  0.00   2.1  14.0   4:00a     S
25  50.6  59.9   2:30p  45.6   8:30a  12.3   0.0  0.01   1.5  13.0  11:00a    SE
26  52.0  60.2   4:30p  46.9   1:30a  11.4   0.0  0.01   2.2  13.0  11:00a     N
27  53.5  63.3   3:45p  46.5  12:45a  10.1   0.0  0.00   2.1  19.0  11:30p     S
28  52.0  57.8   3:00p  47.3   8:15a  12.5   0.0  0.00   5.1  22.0   8:15a     S
29  54.4  58.8   2:30p  48.7  12:00m  11.3   0.0  0.34   7.5  42.0   7:30a     S
30  50.6  57.0   2:45p  47.4   6:30a  12.8   0.0  0.02   1.6  11.0   7:15a   SSE
-------------------------------------------------------------------------------------
    51.9  70.0     3    40.5    13   364.6   0.0  0.80   2.4  42.0    29       N


Max >= 90.0:  0
Max <= 32.0:  0
Min <= 32.0:  0
Min <=  0.0:  0
Max Rain: 0.34 ON 11/29/00
Days of Rain: 6 (>.01 in) 2 (>.1 in) 0 (>1 in)
Heat Base:  65.0  Cool Base:  65.0  Method: (High + Low) / 2