, 1875-10-09

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day a low thermometer was found at
Mobile, but the warm, breath 'ot the cy-
clone was advancing and the cold breath
of the northeast wind was forced to with
draw. Until yesterday it had retraced its
steps as far back as a point in southeastern
Pennsylvania, showing the speedy en-
croachment of the precursor of the cyclone.
Friday last the HERALD published a des-
patch from Houston, Texas, saying sc A
fearful gale has been blowing at Galveston
since yesterday morning. The city is par
TALLY under water. The gale is increasing
aud the barometer is falling. The bay is
so full of water that if the wind changes
to the north the whole island will be
lost"
This was the Identical cyclone reported
a few days before as prevailing on the
southern coast ofCuba. It's regular course
now would be to sweep diagonaIly over
the South and impinge on the Gulf stream
at Cape Hatteras. It might take eight
or ten days to come abreast of the Jersey
coast, but that it will turn out a fearful
traveller to meet on the North Atlantic
may be Judged from its doings at Calves
ton. 1t is possible, however, it may make a
wider sweep than usual over the land ON
its way to meet the warm, humid compa-
ny Of the Gulf Stream.
To learn something for September read
ing of these singular bodies of air called
cyclones and equinotical gales, a HERALD
reporter called yesterday at the weather
signal station on top of the Equitable
Building, Broadway, and through the
courtesy OF the gentleman in charge, DR..
Hiram j. Penrod, who was four years in
charge OF the station at Baltimore, learned
many things that were new and of interest.
Vhe bulletin for the afternoon had lust
been printed, and indicated that the
cyclone was moving in a northeast direc-
ton, the words being " brisk and high
winds and stormy weather have prevailed
on the Middle Atlantic coast, and an area
OF unusually low barometer is central
near PASSPORT. Heavy rains have prevail
ed in the Gulf States and heavy gales have
prevailed in the Gulf" On the wall hung
a weather map, just printed, showing the
barOmetrical conditions all over the Union.
This was worth a full hours study.
The coming cyclone has originated in
the southern region of the zone Of easterly
trade winds east of the Windward Islands,
possibly in the meteorological torrid
zone or equatorial belt of Gains and rains.
A low pressure aud large humidity in it's
central region. Toward this the wind
blows from all points, and, DETECTING
to the right, pursues its spiral course up
ward and inward. The moisture brought
by this wind condenses as the pressure is
reduced and clouds are formed, with hea-
Wy rain. In the centre of the cyclone an
upward current is supposed to exist, and
high above are formed the cirrus clouds
which stream far away in advance on the
upper currents of air. This cyclone is
carried to the north and west until it pass
es into the meteorological temperate zone,
where the prevailing south and west winds
control its motion. The cyclone is now
supposed to pursue a course northward,
parallel to the Gulf Stream with its atten-
dant band of warm, moist air. 1t will
produce heavy easterly gales on our East
Atlantic coast, and will finally get lost in
the Northern Atlantic Ocean, or it may
reach the coast of Great Britain and
cause damage among the shipping. A
despatch from New Orleans yesterday
stated that the ship Marcia Greenleaf, from
ReYal, reported encountering a terrific
hurricane in latitude 25 deg. % min., Ion
gitude 81 deg. 40 min.
The signal station is at q high elevation
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