The San Francisco call., 1898-05-04
THE CALL CALENDAR.
NOTICE TO MARINERS.

Branch Photographic Office San Francisco.
 Cal, May 3, lssS
 in the North Pacific Ocean for May 1928. has just been received from the Photographic
 During the month of May. the sun being we'll north of the equator, the wind and weather may be expected, to 3o undergo dnl marked The sub-chart of sobars and isotherms which appears on the pilot chart and which express generally the meteorological conditions shows an almost permanent high, with its center near latitude 35 degrees north and longitude 14o degrees west Around the high the general circulation of the wind Is with the sun. Along the south side the northeast trade winds will be found with an average force of or Q (Beaufort scale). varying In direction from northeast to east-northeast and with northern limit near the thirteth parallel to the west of the Hawaiian Islands in the vicinity of the twentieth parallel. they will prob ably be from the east. Near the American coast, within the trade wind limits. northerly and northwesterly winds may be expected in stead of northeasterly winds. The southern limit of the northeast and northern limit of the southeast trades will be found farther calm region between the trades. much rain and frequent thlnderstorms may be expected or squalls. A moderate amount of fog may be expected along the coast of the United States. Occasionally thunderstorTns may be ex- pected along the coast of Central America Over the Aleutian Islands will be found an almost permanent low of considerable depth. The general circulation Of the winds around this low is against the sun. In this low area 1t will be observed, by inspection of the Sub-Chart, that the pressure dlmlnSheS more gradually than last month, hence lighter winds are to be expected Between this low and high there is a general movement of the atmosphere from Asia to America evidenced by the westerly and southwesterly winds. In the zone between B degrees and 50 degrees north ire ouent moderate westerly gales may be pected accompanied by rain, and north of 45 degrees north latitude with occasional hail and snow. These gales may be expected. however, to be less frequent as compared with last month Tn this region occasional fog may also be expected.
 Occasional spiral circulations, viz, the cy- clonic fagainst the sun(, with low baromet ter, and the anttcyclonic (with the sun), with high barometer. will be found moving in gen eral easterly direction across te ocean, Gen erally in front of the cyclonic area. or the low the weather Is damp. with thermometer rising and barometer falling. while In front of the anticyclonic circulation. or the high, if Is dry cooler and the barometer rises, The average storm track traced on the chart shows the average path of the centers of these lows. and as this crosses the Pacihc above DO degrees north latitude the storms and gales experienced in this ocean to the southward of the track and above 8 degrees north latitude are generally from southwest through west to northwest.
 logical conditions over Asia during thi, sea- son we may expect to find the northeast mon soon dying out 1t being interrupted with var iabIe winds and calms until the southwest monsoon sets In steadily along the southeast coast of Asia towards the end of the month. This monsoon brings the wet season with it, and hot, sultry and rainy Wea>-Ier may De eN- pected.
 Fog mist and rain will be prevalent about the Iapan Islands and coast Of China. and freouent squalls and thunder storms may be expected in the vicinity of the Philippine Is ianSe ]. T. MCMILLAN.
 AssMtant in Charge