The San Francisco call. [volume] (San Francisco [Calif.]) 1895-1913, 1899-05-21
FORECAST OF WIND AND WEATHER IN
THE NORTH PACIFIC OCEAN FOR
JUNE, 1899.

Atmospheric equilibrium obtains in June
more than during any other month of the
year.
The area Of high barometer: the northeast
trades-The sub-chart OF isObars and isotherms
Tor this month shows an almost permanent area
of high barometer, with center latitude
~ degrees north. longitude las degrees west,
slightly farther to the north and west than
during May. This movement Of the high
causes the region Of the trades TO extend far
Their to the northward than during the pre-
cedng month over the eastern half Of the
ocean the trades VIII be found blowing with
average force OF (Beaufort scale), varying
in direction from north northeast along the
meridian of 100 degrees to east northeast in
midOcean, the polar and equatorial limits ~
ing slightly to the northWard of the parallels
of 80 degrees north and 10 degrees north. re-
spectively. West of the Hawaiian Islands the
trades will probably be from the east North
trades between the American coast and line
drawn from 70 degrees north. 100 degrees W.
10 10 degrees north, 1l5 degrees west. In the
doldrums, calm region. between the trades,
which is rapidly attaining its greatest width,
much ram anu 4IequeN stOI iilS may De
expected, accompanied by Gains, light vari-
able winds or squalls.
Occasional cycIonic storms OF no great In
tensity may be encountered between the paral-
lels OF 10 degrees north and 20 degrees north,
along the sailing route from San Francisco
20 the line Heavy thunderstorms also
likely 70 occur along the coast Of Mexico and
Central America.
The area of low barometer; the prevailing
westerly winds-To the northward Of the Aleu-
tan Islands viii be found an almost perma-
nent low, but OF less depth than the correspond
ing area OF last month The general circula-
ton Of the winds around this low is left
handed, or against the sun. Between this
low and the high TO the southeastward there
IS a steady movement of the air from west
TO east, as evidenced by the westerly and
southwesterly winds These winds Will be
somewhat lighter in force than during the
month OF May.
Cyclonic and anti-cyclonic circulations-Oc-
casonal spiral circulaticns, viz, the cyclonic
(in which the winds rotate against the SUM.
with low barometer and anti-cyclonic din
high barometer, will be found moving in
a general easterly direction across the ocean.
weather is damp, the thermometer rises and
the barometer falls while the general direc-
ton OF the winds is equatorial; In advance
OF anti-cyclonic area, high, il Is dry
the thermometer falls and the barometer rises
while the general direction of the winds Is
polar. The progress of these low areas dis
turbing the mean distribution of pressure will
give rise TO occasional gales between the paral-
lels Of 80 degrees north and 90 degrees north
accompanied by rain and periods of foul wealth.
er generally These, however, VIII be Iese
frequent and OF less duration than during the
month just passed.
Monsoons-As a consequence Of the fall OF
pressure over Central Asia. the southwest
monsoon Will be found to have set in on the
southeast coast of Asia and throughout th4
Philippines. bringing with it hot sultry wealth.
or and abundant rain.
Typhoons-The probability of the occurrence
Of typhoons has increased, especially in tbt
neighborhood OF the Philippines and the south.
east China coast. The region which these
storms most frequent and the tracks fol.
lowed by the various classes are shown upor
The chart.
Fog-Feg and mist will be prevalent alons
the American coast north of latitude 80 de.
grees north and throughout the Gulf of Alaska
Fog may also be expected north OF the 40tf
parallel from the American to the Asiatic coast
stream.