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WEATHER SUMMARY JULY 2000

Mother Nature continues her wild tantrums this month, with 8 days of precip, mostly in  the form of drizzle from heavy, low fogs and 1 bonafide rain event which deposited .15" locally on the 5th. A total of .27" fell for the month, while not a lot, it was still the wettest July for my record base dating to 1984. After the blistering record heat of June, winds have persisted under strong onshore pressure gradients.  The mean temp of 58.7 was also the coolest in memory. Only 6 days reached the 70 degree mark, 3 of them on the last three days of the month after two weeks of solid fog and drizzle. Our warm temps came after a switch in the near constant W-E wind flow aloft early in the month, to the SSE . Around the 26th  winds at 30k' were actually due East. The cause was a large high centered over the four corners going retrograde and quickly moving westward. Heavy T'storms were noted in the Sierra and  western Nevada as tropical moisture was flung north around the high's western edge. Only high clouds were noted here, although dew points  rose considerably. Sea surface temps nudged upward to 57-58F locally, and up to 62F about 35 miles offshore. Major red tide explosions have virtually halted the local fishing scene, which is very unusual considering the SST's were below the generally accepted 60+ temps required to foster heavy plankton growth. Some salmon are being caught near the bait schools, and after a 1 day flurry on the 18th, only 3 Striped Bass have been reportedly caught since then along the beaches.  Around the 20th, a huge red tide invaded Half Moon Bay, trapping bait fish by the tens of millions near shore, and eventually suffocated them as oxygen went to nil. The major, (in size) kill resulted in anchovy, sardine, smelt, mackarel and hearing all washed ashore and piled up in places up to an estimated 1 1/2 feet deep.  The combination of fish, in addition to the quantity, was an interesting note. The stench was unbelievable....with the odor clearly noticeable all the way to Pacifica when the winds shifted the right way (south). Locally, huge schools of anchovy and sardine started crashing the beaches with many locales noting bait washing up on shore.

                   MONTHLY CLIMATOLOGICAL SUMMARY for JUL. 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  56.3  60.3   2:00p  54.1   6:15a   7.8   0.0  0.00   5.3  18.0   3:00p     S
 2  54.9  57.5   1:00p  53.1   7:45a   9.7   0.0  0.00   5.7  20.0   9:00p   SSW
 3  54.8  58.7   4:30p  52.3   7:00a   9.5   0.0  0.00   6.3  25.0   6:00p   SSW
 4  58.2  66.6  11:30a  51.0   6:45a   6.2   0.0  0.00   4.1  21.0   9:00p   SSW
 5  55.7  58.3   2:15p  53.4   2:45a   9.2   0.0  0.15   4.4  18.0  12:15a   SSW
 6  57.6  64.4   3:30p  53.8   7:15a   5.9   0.0  0.00   4.2  17.0   1:15p   SSW
 7  59.4  66.3   3:00p  55.2   6:00a   4.3   0.0  0.00   4.6  18.0   3:45p   SSW
 8  59.8  68.5   2:30p  56.0   6:30a   2.8   0.0  0.00   3.2  13.0   4:45p   SSW
 9  62.6  73.9   4:30p  53.4   6:45a   1.3   0.0  0.00   2.1  10.0   1:30a     W
10  59.3  68.0   2:15p  51.7   4:15a   5.2   0.0  0.00   4.4  23.0  10:45a     S
11  60.5  72.6  12:30p  51.5   5:00a   3.0   0.0  0.01   4.4  26.0   3:15p   SSW
12  61.9  69.8   2:45p  56.5   4:15a   1.8   0.0  0.00   4.4  17.0   9:00a     S
13  61.3  70.6   1:00p  54.1   4:45a   2.7   0.0  0.00   2.8  14.0  12:45p     N
14  60.2  68.5   1:15p  54.3   7:30a   3.6   0.0  0.00   2.6  11.0   5:00p   SSW
15  58.2  64.4  12:00p  55.3   5:30a   5.2   0.0  0.00   3.2  15.0   4:00p   SSW
16  57.0  60.2   2:15p  55.2   3:30a   7.3   0.0  0.01   4.7  14.0   2:45p   SSW
17  58.7  63.5   3:45p  56.0   5:30a   5.3   0.0  0.03   3.9  14.0   3:30p   SSW
18  59.3  66.8   4:15p  55.8   6:15a   3.7   0.0  0.00   3.7  14.0   8:45p     S
19  58.7  66.8   2:30p  54.6  12:00m   4.3   0.0  0.00   3.9  16.0   7:00p   SSW
20  55.5  63.1   1:45p  53.3   8:30a   6.8   0.0  0.01   3.8  15.0   2:15p   SSW
21  55.1  58.3   4:00p  52.8   6:15a   9.5   0.0  0.03   5.2  18.0   2:45p     S
22  57.1  64.2   2:45p  53.5   7:00a   6.2   0.0  0.02   4.1  16.0   3:30p   SSW
23  57.8  68.0   3:15p  51.6   5:15a   5.2   0.0  0.00   2.2  11.0   5:30p   SSE
24  58.0  69.2  12:00p  50.5   5:15a   5.2   0.0  0.00   2.3  11.0   5:15p   SSW
25  59.0  67.1   2:45p  52.8   5:00a   5.1   0.0  0.00   4.5  21.0   7:30p     S
26  58.9  66.2   3:45p  54.2   6:00a   4.8   0.0  0.00   5.8  26.0   5:45p     S
27  59.8  66.7   3:30p  56.2   6:45a   3.6   0.0  0.00   4.1  15.0   3:00a   SSW
28  58.8  66.8  12:15p  54.0   6:30a   4.6   0.0  0.01   3.3  12.0   5:15p   SSW
29  61.2  76.4   3:15p  53.8   6:15a   0.0   0.1  0.00   2.2  10.0   2:00p     W
30  60.4  71.2  12:30p  54.3   6:45a   2.3   0.0  0.00   2.2  11.0  12:45p   SSW
31  62.5  73.4   3:15p  53.3   7:00a   1.7   0.0  0.00   2.1   9.0  12:30p   SSW
-------------------------------------------------------------------------------------
    58.7  76.4    29    50.5    24   153.2   0.1  0.27   3.9  26.0    11     SSW


Max >= 90.0:  0
Max <= 32.0:  0
Min <= 32.0:  0
Min <=  0.0:  0
Max Rain: 0.15 ON  7/05/00
Days of Rain: 4 (>.01 in) 1 (>.1 in) 0 (>1 in)
Heat Base:  65.0  Cool Base:  65.0  Method: (High + Low) / 2