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Weather Summary- FEB1998

A record month by any standards for Pacifica, with 13.53" of rain and 23.88" since Jan 1,'98, AND 38.56" for the climatological year (July-Jun).Average YEARLY rainfall in Pacifica is about 23", so we have received more than a typical year's worth of rain in the last two months alone. El Nino fueled storms pummeled the coast in a seemingly constant parade for the entire month. By my count, 12 separate storms hit the Pacific coast, with many more embedded troughs and squalls. Only the last two days, the 27th and 28th, did we get two consecutive days without rain (in fact,only.02" has fallen for the last five days. Peak winds were frequently in the 40mph category, and twice hit 60. Much destruction along the coast due to surf constantly in the 15-25' category and coupled with high tides, eroded local cliffs at record rates. Over 30' of erosion has been frequently noted and even more in hardest hitareas. Many areas of the Bay Area are running 200-250% of normal rain..and most areas are forecast to have received over 250% of rain once the rainy season is over in May. We had 19 days of measurable rain, and 2 others with drizzle. With still 3 full months left in our rainy season, this is now regarded as the third wettest year ever. A new annual record is not out of the question but unlikely (49+" in 1861-62 in San Francisco ...current rain total in SF is 38.5"- normal annual rain is 20"). A peculiar characteristic of storms this month was the amount of convective activity and snow levels actually lower than normal. I noted pea hail 9 times and genuine hail in T'Storms twice. T'storms were noted on 7 different days in the immediate area, and is likely conservative overall. This can mostly be attributed to the track many cold cores followed, which brought many vortex max very near the Bay Area supported by 140-185kt jet streams (reaching 200kt). In one waywe were fortunate as ground saturation has reached a critical stage where any rain becomes runoff - these storms didn't linger as some "pineapple connections" do (when the front line runs 90 degrees to the coast then stalls). Most of these February storm fronts and squall lines maintained a more parallel axis, thus rains were intense and frequent, not prolonged.

MONTHLY CLIMATOLOGICAL SUMMARY for FEB. 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  55.4  57.5   2:00p  52.3   7:30a  10.1   0.0  0.70   7.7  39.0  10:45a     S
 2  55.6  58.4   2:45p  53.0  12:00m   9.3   0.0  2.63   8.9  60.0   4:45p     S
 3  51.5  53.3   2:15p  49.1  10:30p  13.8   0.0  1.27   4.6  22.0  12:30a     S
 4  51.8  56.9   1:45p  47.9   3:00a  12.6   0.0  0.26   4.7  30.0   7:45p     S
 5  53.5  55.7  12:45p  49.9   5:15a  12.2   0.0  0.30   7.5  41.0  12:15p    SE
 6  52.5  55.4  12:15a  50.3   3:30p  12.2   0.0  1.88   9.3  47.0   8:15a     S
 7  52.8  56.2   3:30p  50.2   5:30a  11.8   0.0  0.95   9.3  40.0   8:15a     S
 8  49.2  52.4  12:15a  45.5  12:00m  16.0   0.0  0.30   2.4  20.0   1:00a   NNE
 9  48.0  55.2   2:45p  42.2   7:30a  16.3   0.0  0.00   1.2  11.0  11:45a     N
10  49.9  51.9   9:30a  45.4   1:30a  16.3   0.0  0.19   6.3  46.0   1:45p     S
11  53.3  59.5   2:00p  49.3  10:30p  10.6   0.0  0.10   1.9  14.0   1:00a    SE
12  52.4  57.1   2:00p  49.1   8:30a  11.9   0.0  0.16   4.6  32.0   3:30p   SSW
13  54.3  59.0   2:00p  50.1   6:00a  10.5   0.0  0.00   2.1  19.0   9:15p   ESE
14  51.6  55.1  10:00a  46.9  10:15p  14.0   0.0  0.66   7.9  43.0   3:30a     S
15  50.4  56.1   1:15p  46.6   6:30a  13.7   0.0  0.00   2.1  13.0  12:00p   SSE
16  48.9  51.3   4:15p  45.9   1:45a  16.4   0.0  0.53   5.6  46.0   1:45p     S
17  51.1  56.8   2:15p  46.6   4:30a  13.3   0.0  0.08   2.5  17.0   3:15p     S
18  52.1  59.3   1:15p  47.0   2:30a  11.8   0.0  0.03   3.1  23.0  10:30p     S
19  50.2  54.0  10:00a  45.5  11:30p  15.3   0.0  1.01   6.3  39.0  11:00a   SSW
20  48.5  54.2  12:30p  41.7   7:00a  17.0   0.0  0.02   2.5  18.0  12:00m   ESE
21  51.7  55.7  10:15a  48.0  11:15p  13.2   0.0  1.52   8.1  47.0  10:30a     S
22  50.4  55.5  12:45p  46.0   6:00a  14.3   0.0  0.01   3.4  19.0   2:00p     S
23  50.0  52.7   7:30a  45.6  12:00m  15.8   0.0  0.91   7.0  36.0   1:45p     S
24  50.1  56.1   1:45p  44.0   5:45a  15.0   0.0  0.00   3.8  31.0   7:15p     N
25  52.2  55.7  11:00a  50.2   3:00a  12.0   0.0  0.01   5.1  23.0  12:45a     N
26  51.5  55.6   1:00p  47.4   6:45a  13.5   0.0  0.01   4.1  24.0   4:00a     N
27  54.1  58.1  12:45p  52.1   3:15a   9.9   0.0  0.00   2.2  13.0   4:00p   SSW
28  52.2  55.6  10:00a  50.8   7:15a   0.0   0.0  0.00   2.5  14.0   1:45a     N
-------------------------------------------------------------------------------------
    51.6  59.5    11    41.7    20   358.7   0.0 13.53   4.9  60.0     2       S


Max >= 90.0:  0
Max <= 32.0:  0
Min <= 32.0:  0
Min <=  0.0:  0
Max Rain: 2.63 ON  2/02/98
Days of Rain: 19 (>.01 in) 15 (>.1 in) 5 (>1 in)
Heat Base:  65.0  Cool Base:  65.0  Method: (High + Low) / 2