The San Francisco call., 1899-10-29
WEATHER FORECAST FOR NOVEMBER
Continued From Page 19.

erIy winds: An elongated trough OF low bar
ometer (pressure 2s.6O inchesl lies to the
southward of the Aleutian Islands. AROUND
this area the circulation OF the winds Is cy-
clonc, or against the sun. The TWO clrcula-
tons, cyclonic (around the low) and anti-cy-
clonc (around the high thus unite in giving
rise to belt of westerly winds extending
from 80 degrees north to 30 degrees north. 1he
average strength of these winds will show a
marEed Increase over October They will be
subject to frequent Interruptions by the tenn
porary wind systems proper to the eastward
scribed below. Gains and variable winds VIII
occur throughout belt extending from % TO
40 degrees north, 145 to 175 degrees west.
The northeast monsoon-The winter area OF
high pressure central Continental Asia
is now well established and the anIi.cy IS @
circulation to which this area gives rise covers
the China and the Ceebes seas, the Phlhppihe
Islands and the eastern coast OF Asia as IaI
north as Shanghai, with the northeast (Ii (Win-
teri monsoon. Beyond this point the prevail
ing direction of the wind will be north 70
northwest In the vicinity of the mainland the
monsoon exhibits marked tendency to follow
the trend of the coast. Here II also Weahens
slightly by night and at the same time blows
somewhat of shore, often permitting Vessei
close under the land to make way northWaro
against 1t. The monsoon brings thick weather
and rain along a weather shore. A rising par
ometer foreruns an increase in strength; a rail-
ing barometer a decrease.
Cyclonic and anti-cyclonic circulations-Iem-
porary areas OF alternately high and low bar
ometer will be found moving in a general east
areas of high barometer the winds circulate in
the same direction the hands OF watch
(nnti-cycIon1c); around the area or low Daro-
meter in the opposite direction (cyclonic). In
advance OF an anti-cyclonic area, or high, the
weather is dry (shown by the large difference
between the wet and the dry bulb; the baro-
meter rises; the thermometer falls; the clouds
(cirrus. cirro-cumulus, alto-cumulus) tend to
dissolve and the general direction OF the
winds is polar or westerly. In advance Of a
cyclonic area, or low, the weather is damp
(shown by the small difference between the
wet and the dry bulb; the barometer falls the
thermometer rises; the clouds (cirro-stratus,
alto-stratus nimbus) tend to gather, and the
general direction of the winds Is quatorial
or easterly. The eastward passage of an anti
cyclone is marked by light winds and fair
weather; OF a cyclone, by gales, rain and foul
weather. The path of the center OF the latter
is generally confined to the region between IS
degrees north and 80 degrees north. Their oc-
currence increases in frequency as the season
advances. Out of 233S wind observations dur
ing November within the belt 35 to 80 degrees
north and 125 west to 145 east A per cent gave
force OF or over beaufort scale); 80 per
cent force OF or over; as compared with
a per cent and Il per cent, respectively. for
October.
Typhoons-The probability Of the occurrence
of typhoons is much diminished, the average
for the month being two. The region through
ut which these storms occur and the tracks
followed by the several classes are shown
elsewhere upon the chart.
Fog-Fog and heavy mist will be met along
the American coast, also along the trans
Pacific routes north of the 45th parallel but
with less frequency than during October