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1998 Year in Review


1998 will be remembered as one of the most abnormal weather years in history here on the Central Pacific Coast. Jan and Feb, during the heart of the great 97-98 El Nino, saw over 25" rain, or more than a typical annual rain total (23"). Feb. alone had 14". Rains/temps in May resembled those of a typical March with around 600% of normal rain (near 3.6" vs. 0.62 normally). May also brought three separate tornado days, 12 T'storm days, and 15 days of rain. An F2, anti-cyclonic tornado in Sunnyvale on May 4, brought extensive damage to dozens of homes . Rains in May also brought snow down to the local hills to 2K', which is virtually unheard of. By June, rains quit, as the ENSO started shifting to La Nina conditions. Summer was quite dry, no severe heat spells and near record cool temps in early and mid summer. Below average precip occurred in the Sierra during the summer, and due to cool temps, snowmelt was very late. No significant tropical storms made it this far north, however some severe storminess was noted in SoCal in early summer. EPacific hurricanes were significantly lower in number, although several reached near record intensities in July/Aug. As La Nina intensified, hurricanes dropped off in the Pacific, although activity in the western Atlantic was significantly higher. Early fall rains brought near to slightly above normal rains to the Central Coast, above average rains near Eureka and flooding rains to the PacNW. SoCal has received much below normal rain for the last half of 1998, and severe Santa Ana winds have been common with some local damage. In December, two extremely cold events occurred, one bringing snow to the deserts and Las Vegas early in the month, and the other on December 20, as snow fell as flurries in Pacifica  and heavily in Monterey/Santa Cruz from a series of squalls riding along an arctic front that brought near record temps to all of California. Lows in the lower teens were recorded in Marin COunty and elsewhere. 24F was noted in Golden Gate Park on the 23rd. By year's end, skies were P/C and with little rain on the horizon, and below normal rains for the remainder of season are now anticipated. Highest temp for the year was 81F in September and the low 30.7F in late December. 

ANNUAL CLIMATOLOGICAL SUMMARY-1998


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


               TEMPERATURE (°F), HEAT BASE 65.0, COOL BASE 65.0
                          DEP.  HEAT  COOL                                          
        MEAN  MEAN        FROM  DEG   DEG                        MAX  MAX  MIN  MIN 
 YR MO  MAX   MIN   MEAN  NORM  DAYS  DAYS  HI  DATE  LOW  DATE  >=90 <=32 <=32 <=0 
------------------------------------------------------------------------------------
 98  1  58.6  46.1  52.8   0.0   368     0  64.7  17  42.1    5    0    0    0    0
 98  2  55.6  48.0  51.7   0.0   368     0  60.6  28  41.7   20    0    0    0    0
 98  3  59.9  47.0  53.8   0.0   325     0  68.5  11  41.1   29    0    0    0    0
 98  4  62.9  48.3  53.7   0.0   313     0  78.4  21  42.5   14    0    0    0    0
 98  5  60.2  52.1  56.0   0.0   258     0  68.8  18  47.4   17    0    0    0    0
 98  6  67.0  55.6  58.2   0.0   159     1  77.0  17  50.3   19    0    0    0    0
 98  7  62.4  54.7  59.5   0.0    52     0  71.7  25  52.0    3    0    0    0    0
 98  8  66.9  56.4  61.1   0.0    87     6  79.3   5  50.3   27    0    0    0    0
 98  9  68.7  56.7  61.3   0.0    94    19  80.1   4  51.7   10    0    0    0    0
 98 10  67.5  52.1  58.3   0.0   180     6  78.6  20  47.0   31    0    0    0    0
 98 11  56.7  50.3  53.6   0.0   324     0  65.7  26  44.4    9    0    0    0    0
 98 12  64.6  36.2  49.1   0.0   485     0  69.9  17  30.7   21    0    0    1    0
-------------------------------------------------------------------------------------
        62.6  50.3  55.8   0.0  3012    32  80.1 SEP  30.7  DEC    0    0    1    0


                                PRECIPITATION (in)


              DEP.   MAX        DAYS OF RAIN 
              FROM   OBS.          OVER
 YR MO  TOTAL NORM   DAY  DATE .01   .1   1
--------------------------------------------
 98  1 10.27  5.49  1.67   18   23   17    3
 98  2 13.53  9.79  2.63    2   19   15    5
 98  3  2.22 -1.20  0.61   31   13    4    0
 98  4  2.37  0.74  0.69    3   12    6    0
 98  5  3.58  2.96  0.93   28   15   10    0
 98  6  0.25  0.02  0.07   25    5    0    0
 98  7  0.03 -0.06  0.01    3    0    0    0
 98  8  0.02 -0.16  0.01    3    0    0    0
 98  9  0.19 -0.21  0.07   27    4    0    0
 98 10  0.96 -0.43  0.87   24    2    1    0
 98 11  4.60  1.75  1.12   30   15    9    1
 98 12  1.82 -2.20  0.56    3    6    4    0
--------------------------------------------
       39.84 16.49  2.63  FEB  114   66    9


                                WIND SPEED (mph)
                          DOM
 YR MO   AVG.  HI   DATE  DIR
---------------------------------
 98  1   4.6  48.0   26    S
 98  2   4.9  60.0    2    S
 98  3   3.6  46.0   23    S
 98  4   4.0  49.0   30    S
 98  5   4.0  35.0    1    S
 98  6   3.6  24.0   20  SSW
 98  7   1.7  27.0   24  SSW
 98  8   2.8  22.0   17  SSW
 98  9   2.8  30.0    4  SSW
 98 10   2.3  33.0   24  SSW
 98 11   3.7  58.0   30    S
 98 12   3.3  44.0    5    N
----------------------------------
         3.4  60.0  FEB  SSW