The San Francisco call., 1899-08-31
Forecast of WInd and We4Aer
IN THE NORTH PACIFIC OCEAN FOR SEP
TENDER, 1899

IN THE NOklH GAtlIlO Otf.A-N L Olh ser %
TENDER, 1899.
The Area of High BaTometer-The NE.
Trades-The sub-chart Of average pressure con-
Gitious for the month of September shows an
area Of high borometer tprcssure 3J30 mches)
central in latitude y degrees y, longitude li6
degrees W. Around this area Of high barometer
the winds of the North Pacific circulate in a
positive or anti-cyclonic direction, i. in the
same direction as the hands of a clock, the
wind arrows OF the pilot chart showing the
prevalence Of nOrtherly winds between the area
OF maximum pressure and the Pacific coast of
the United States, northeasterly and easterly
winds tthe Sc. trades on the southern slope
souT heaSt-rly, sDutherly and SOuthWeSterly
winds To the west of the center, and variable
winds, the prevailing Clrectlon belhs S.N.'
along the northern slope In the immediate
uelghborhood of the center itself calms and
light variable winds Will abound. The prob
able limits of the trades shown upon the
chart Their strength will be somewhat
greater than during August, their prevailing
direction ranging from NNE. along the me-
riaian OF l30 degrees W. TO ENE. in mid-Ocean,
and to ESE beyond the meridian of 1S0 de
grees To the westward Of this meridian and
between the line and the parallel Of 10 degrees
N frequent light variahles and Gains may be
expected. NoTtherly and northwesterly winds
viii replace the trades between the American
coast and a line drawn from 40 degrees N, l35
degrees W. 10 l5 degrees n, llO degrees W.
Southeasterly and southerly winds, becomlng
sOuthwesterly as they gain in latitude Will pre-
vail from the American coast westward to 10
degrees w. and from the line 10 ~ degrees n
Light easterly winds may be expected between
80 degrees y. and - degrees n. and within five
degrees Of the coast The winds Of this re-
gion especially Of its more northern portions,
will be subject TO frequent Interruptions by
tedious Gains.
The sW Monsoon-The cyclonic circulation
around the OF low pressure which covers
southeastern Asia gives rise to the SW. mon
soon. which viii continue to blow throughout
the China Sea during the present month.
Before the close OF the present month, however,
this area OF low pressure Will begin to give way
before the advance Of the area or high pressure
which covers continental Asia during the
itself lelt the northern coast Of Formosa and
IN the Foru0sa Channel. Less rain and cooler
weather may De expected along the western
coast uf LuzOn.
Storms on the Mexican Coast-The months Of
September and October. the period during
which the wet season on the coast Of Lower
California anN Mexico is supplanted by the
dr., noted in those regions for the occur
renee of q local storm OF great violence known
lsl CurdouazO de san Francisco CThe Whip
Of 81. Francis. These storms develop rapidly
and are especially dangerous to vessels lying
al anchor as the open harbors along the coast
offer. but slight protection. They OF cyClOniC
nature. setting IN from the east and shifting
20 west by way Of north Il the observing vessel
is 10 the left Of the storm track, by way of
south il she is 10 the right OF the track. The
motion of the storm center is toward point
between north and east. Heavy thunderstorms
are also probable along the coast OF Mexico
and Central America, and in the doldrums, or
region between the trades. Squally weather,
vicinity OF the Hawaiian Islands.