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AUGUST 2000 WX REVIEW

Record cold/rain at the end of month! A usually quiet month, early August certainly lived up to it's  typical, and boring, pattern of F&LCATCNM ...until the last 3 days, when an very unusual combination of sub tropical moisture swinging around a vigorous cutoff low off the SCent Calif. coast merged with a deep, cool trough digging south from GOA. Officially, Pacifica received only .09" for the month, however many records were set on the 30th through Sept.1 for both daily precip and daily lo/highs  throughout Cent and No. Calif.  Both Santa Rosa and San Jose, at the northern and southern extremities of the Bay Area had record lo/highs, 62 and 64 respectively...a full 20 degrees below normal. Some scattered convection was noted in southern Monterey County on the 30th, and also in the Cent Valley on Sept. 1. As the northern trough rapidly dug south off the coast, snow level in the northern Sierra dropped to 6,500' on 9/01, prompting a special adisary from the NWS.  Snow levels in the Cent Sierra near Tahoe was 7,500'. It was unusual but not unheard of for snow this time of year...I personally encountered 7 inches of snow at Caples Lake (elv. 7,8200') in the Cent Sierra in late August of 1968, with snow in decent accumulation down to 7,000'.  Record lows near the coast were set by a combination of an unusually deep and cold trough digging from the north, and our below average Sea Surface Temps, which consistantly were below 60F north of Point Concepcion and only 53-55F locally. Due to the almost constant onshore flows, the largest anomolies were nearest the coast (as expected) and as much as 4 degrees below normal for this time of year. Despite the overall cold water data, the ocean remains offcolor from plankton (red tide) growth. The cause is interesting....while the overall SST is below normal, there has been a persistant trend for  "relatively"  shallow warmer layer (54F on the top and 53 belowF) to cap upwelling. Hence water clarity dramitically improves, and allows deeper light penetration into the sea. Increased light means extra plankton growth...hence the red tide explosion. UNFORTUNATELY, the red tide has also clobbered our local striper fishing, which was virtually none-existant all month.

                   MONTHLY CLIMATOLOGICAL SUMMARY for AUG. 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  63.2  76.0   3:45p  54.7   6:15a   0.0   0.3  0.00   1.5  11.0   2:30p   SSW
 2  66.7  83.3   3:00p  52.9   5:45a   0.0   3.1  0.00   2.4  26.0   1:45p    SW
 3  61.8  67.8   3:45p  56.9   5:30a   2.6   0.0  0.00   6.9  27.0   1:00p     S
 4  62.5  72.2  11:00a  56.7  11:15p   0.6   0.0  0.00   4.1  24.0   6:00a   SSE
 5  57.3  63.3   4:00p  53.2   5:30a   6.8   0.0  0.00   2.4  10.0   1:00p   SSW
 6  56.2  59.1   2:45p  54.1   7:30a   8.4   0.0  0.01   4.9  17.0   5:45p   SSW
 7  57.8  62.6   2:45p  55.0   7:15a   6.2   0.0  0.03   5.6  21.0  10:45a     S
 8  58.9  63.7   2:30p  55.7   5:00a   5.3   0.0  0.01   3.1  16.0   4:45p   SSW
 9  60.7  66.8  11:45a  56.7   4:45a   3.3   0.0  0.00   3.6  16.0   5:30p   SSW
10  62.0  69.0   2:45p  57.9  11:30p   1.5   0.0  0.00   3.4  15.0   3:00p   SSW
11  62.8  74.3   3:00p  52.6   7:00a   1.5   0.0  0.00   2.5  10.0   3:15p   SSW
12  59.2  71.3  12:00p  51.5   7:00a   3.6   0.0  0.00   2.2  14.0   6:30p    NW
13  60.5  71.4  10:00a  52.9   4:15a   2.8   0.0  0.00   2.0  14.0   5:30p     W
14  60.3  70.5   9:45a  51.8   5:45a   3.8   0.0  0.00   2.8  14.0   5:00p     E
15  60.0  69.8   2:15p  51.5   7:00a   4.3   0.0  0.00   2.1  10.0   2:15p    SE
16  60.1  73.0   2:45p  49.5   5:30a   3.8   0.0  0.00   2.4  11.0   4:30p   SSW
17  59.3  69.0   2:15p  50.8   5:45a   5.1   0.0  0.01   2.8  19.0   4:30p     S
18  59.2  67.5   1:30p  52.9   5:30a   4.8   0.0  0.00   5.3  25.0   9:15p     S
19  57.7  64.9   2:15p  54.1   6:00a   5.5   0.0  0.01   5.1  20.0   6:45p     S
20  60.1  69.4  12:15p  53.0   7:00a   3.8   0.0  0.00   3.3  15.0   5:00p   SSW
21  61.0  73.8   1:15p  51.1   7:15a   2.5   0.0  0.00   2.2  13.0   7:00p   NNW
22  60.8  69.4   2:45p  53.4   4:30a   3.6   0.0  0.00   4.0  20.0   1:15p     S
23  60.4  66.8   2:30p  55.2   5:15a   4.0   0.0  0.00   4.7  19.0  12:15p     S
24  62.5  70.5  12:30p  55.5  10:15p   2.0   0.0  0.00   2.9  11.0   1:30a   SSW
25  60.7  71.2  12:45p  52.4   6:30a   3.2   0.0  0.00   2.8  14.0   5:30p   SSW
26  60.3  71.7   2:00p  54.7  10:45p   1.8   0.0  0.02   2.7  14.0   2:15a     W
27  60.4  75.1   1:15p  51.7   7:15a   1.6   0.0  0.00   1.8  12.0   2:45p     W
28  60.7  72.8   1:45p  52.8   3:15a   2.2   0.0  0.00   2.5  14.0   9:00a     N
29  58.3  61.2   1:00p  55.6   7:00a   6.6   0.0  0.00   2.0  15.0  12:00p   SSW
30  61.9  69.0   2:15p  58.0   1:15a   1.5   0.0  0.00   3.2  13.0   2:00p     S
31  62.1  69.7  10:00a  57.4   3:45a   1.5   0.0  0.00   3.6  15.0   4:15p     S
-------------------------------------------------------------------------------------
    60.5  83.3     2    49.5    16   104.3   3.5  0.09   3.3  27.0     3     SSW


Max >= 90.0:  0
Max <= 32.0:  0
Min <= 32.0:  0
Min <=  0.0:  0
Max Rain: 0.03 ON  8/07/00
Days of Rain: 2 (>.01 in) 0 (>.1 in) 0 (>1 in)
Heat Base:  65.0  Cool Base:  65.0  Method: (High + Low) / 2