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NOVEMBER 1998 WEATHER SUMMARY

November is generally the month when the early season weather pattern takes hold. With this year's La Nina in full swing, (but not yet a major event), the pattern is a bit less well etablished. The Pacific Northwest was battered with up to 20" in some coastal areas in Oregon, and more along the Olympic Peninsula in Wash. The area of above average rains extends down to about the Eureka/Redding line, and drops off the farther south. While monthly rain totals were above normal in Pacifica, (4.6" or 1.75" over historical norms ('61-'90)the monthly totals were locally enhanced by the proximity of the most significant event to date on the 29th-30th, when 1.18" fell. Santa Rosa, to our north, is still below average for the year. With 15 days of rain, 4.6" isn't really a lot. Last year for example, we had 11 days of rain but 7.93" of rain for Novemeber. Early this month, zonal flows centering on the NW became entrenched, with occassional errosion of the EPac ridge which allowed tails to sweep through. This latest storm however, marked a change in the pattern with a deep, cold core low coming onshore just north of the Bay Area, bringing gusty wind to 58mph here and generally gale force winds elsewhere.  Surf was very high with >25' sea/swells reported along the coast. The Pacifica shoreline was hit hard by waves on the night of the 29th. The next 4-6 days will likely feature more cold storms, with a chance of snow in the local hills down to 2-3K' in 4-5 days. This cold air streaming south also should bring an enhancement to the dry stable air of the EPac High, and we should go dry for a while. In weak La Nina years, as the Winter progresses, the ridge should build ever stronger and rain events subside. Stronger La Nina years can steer storms down the coast and bring colder, windier event to Central California.  With the ENSO index not looking exceptional, I currently tend to go with the weaker La Nina scenario. Temps overall were quite mild, with a low of only 44.4F. The high for the month was set on the 26th (66F), and temps in general were a bit cooler early in the month under mostly cloudy skies. Many trees have not completed their fall drop, due in part to the mild fall temps and the very late bloom last spring. As a result of the altered growing season, many fruit trees, while loaded with fruit, were generally undersized. Particularly hardhit were apples and pears. Other harvests, such as the wine vinyards had lower than average yieds, but the quality is said to be very good.  

                   MONTHLY CLIMATOLOGICAL SUMMARY for NOV. 1998


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  55.1  61.9   2:00p  49.4  12:00m   9.3   0.0  0.03   1.8  11.0   6:30a     W
 2  53.7  60.2   2:00p  48.3   3:30a  10.8   0.0  0.01   1.9  13.0   2:30p     E
 3  55.4  62.7  12:30p  51.6   2:00a   7.8   0.0  0.03   1.1   7.0   1:00p     S
 4  53.2  55.8  12:30p  49.0   5:30a  12.6   0.0  0.01   1.7   9.0   5:30p     E
 5  54.1  59.7   1:30p  49.9  12:00m  10.2   0.0  0.00   4.5  25.0  12:00p     N
 6  53.1  57.7   3:00p  47.9   4:00a  12.2   0.0  0.07   3.9  21.0  10:00a     S
 7  53.5  56.9  10:00a  48.5  11:00p  12.3   0.0  0.78   7.8  43.0   5:00a   SSW
 8  51.6  57.6  12:00p  46.4  12:00m  13.0   0.0  0.11   1.7  13.0  12:30p   SSW
 9  50.3  58.5   2:00p  44.4   5:00a  13.5   0.0  0.01   1.4  11.0  12:30p    SW
10  51.3  53.5  10:30a  48.3  12:30a  14.1   0.0  0.13   3.9  24.0   6:00p     S
11  51.6  55.9   2:00p  47.3  12:00m  13.4   0.0  0.00   2.2  16.0  10:00a   ENE
12  51.7  60.2   3:30p  46.7   6:00a  11.5   0.0  0.00   1.6  13.0   1:30p   NNE
13  53.9  61.6   2:30p  48.6  12:30a   9.9   0.0  0.00   2.6  13.0  11:00a   SSW
14  53.7  61.0   2:30p  47.1   8:00a  11.0   0.0  0.01   1.5  13.0  11:30a     W
15  56.5  61.0  11:30a  51.4  11:00p   8.8   0.0  0.04   1.7  12.0   7:30a    SE
16  55.6  62.2   3:00p  51.8   6:30a   8.0   0.0  0.04   3.7  25.0  11:00p     S
17  54.0  58.6   1:00p  50.8   9:00p  10.3   0.0  0.08   4.4  25.0  12:30a     S
18  52.0  59.0   1:30p  46.9   7:30a  12.0   0.0  0.00   1.8  18.0   4:30p     S
19  51.6  60.9   1:00p  46.5   7:30a  11.3   0.0  0.01   1.4  11.0   1:00p    SE
20  52.2  61.4   2:30p  45.1   5:30a  11.8   0.0  0.01   1.1   8.0  10:30a    NE
21  56.6  62.0  11:30a  52.8   1:00a   7.6   0.0  0.23   4.4  24.0   6:30p     S
22  56.5  61.1  12:00p  51.2   7:30a   8.8   0.0  0.00   1.9  17.0  12:00m   SSW
23  56.4  58.6  12:30a  53.0  12:00m   9.2   0.0  0.91  14.5  48.0   1:00p     S
24  53.0  58.6   2:00p  49.5   9:00p  11.0   0.0  0.00   2.0  17.0   1:00a   SSW
25  53.6  61.4   1:30p  47.9   5:00a  10.3   0.0  0.00   1.8  11.0   1:30p   ESE
26  56.7  65.7  11:30a  52.1  12:00m   6.1   0.0  0.12   3.8  26.0  12:30p     S
27  53.5  55.9   1:00p  51.3  12:00m  11.4   0.0  0.12   0.9   9.0   3:30p     N
28  50.8  54.1   1:00p  47.5   8:30a  14.2   0.0  0.01   2.9  21.0  12:00p   SSW
29  53.4  57.6  12:00m  50.3   3:00a  11.1   0.0  0.72  14.0  45.0   6:30a     S
30  54.6  59.1   5:00a  51.0  12:00m  10.0   0.0  1.12  11.9  58.0   7:30a     S
-------------------------------------------------------------------------------------
    53.6  65.7    26    44.4     9   323.6   0.0  4.60   3.7  58.0    30       S


Max >= 90.0:  0
Max <= 32.0:  0
Min <= 32.0:  0
Min <=  0.0:  0
Max Rain: 1.12 ON 11/30/98
Days of Rain: 15 (>.01 in) 9 (>.1 in) 1 (>1 in)
Heat Base:  65.0  Cool Base:  65.0  Method: (High + Low) / 2