Perrysburg journal. (Perrysburg, Wood Co., O. [Ohio]) 186?-1965, 1872-12-20
Facts Abont Storms.

vast amount OF information is constantly
being collected BY the United States Signal
Service respecting storms, &C., out Of which ID
being gradually built up the true science ol
that class Of meteorological phenomena. The
War Department at Washington issue daily
. maps In the inter Of commerce and agrieul-
sure, all observations being made at the same
moment Of actual time from seventy-two signal
stations located throughout the United States
not directing the storms, but giving information
from whence they are coming, when to prepare
for them, 10. Among the general observation,
rtSss FAR noted may bs mentioned the following
which will be Of especial interest to those
teachers and others who had the pleasure o
hearing Prof. HARvEr's "lscture on storms" al
She'rscent session of the Teachers Institute:
Storms are accompanied with a depression o
the barometer near the central line Of the storm
and rise Of the barometer in the front and rear
This central line of minimum pressure is gen
eraNy 81 great length from North to Souri
and moves side-foremnst toward the sea.
This line is sometimes nearly straight but
generally curVel, and most frequently with its
convex side toward the East.
The velocity OF this line Is such that IL travels
from the Mississippi to the Connecticut river in
about twenty four hours, AMI from the Con
necticut to 81. john NewfOundl md, in nearly
the Same time, OF about thirtysix miles an
hour.
When the barometer falls suddenly in the
western part of New England, it rises at the
same tim. in the valley OF the Mississippi, aud
also at st. Johns, newfoundland.
In great st0rms the wind for several hundred
miles on both sides OF the line Of minimum
pressure blows toward that line directly or ub-
liquelY.
The force of the wind ia in proportion to tha
suddenness and greatness OF tue depression OF
the barometer.
In all great and sudden depression Of the
barometer there is much rain or snow and i n
all sudden great rains or snow there is great
depression Of the barometer near the centor oi
she storm, and rise beyond its borders.
9sany storms are OF great and unknown length
from north t0 south. reaching beyond our oh
servers on the Gulf Of Mexico and IN the North
sTn Lakea, while their sast and west diameter is
comparatively small. The storms, thsref fore,
moge sils IoTSnost.
Most storms commence in the "fAr West, -
beyond our most eStern observers, bat Eome
commence In the United States.
During the passage Of storms the wind aener-
ally changes from the Eastward tO the West
ward by tho S"ulh. especially in the Southern
part ofths United States.
The Northern part Of the storm generally Y
HaVsfs more rapidly toward the East than the
S,uthern part.
During als high barometer OF the day pro-
ceedipE tho StOrm it 10 generally clear and mild
in temperature, especially II very cold.
The temperature generally falls suddenly on
the passage Of the center great storms and
sometimes, when n stprm is in the middle rf The
United States, the lowest temperature 0f the
M NTH will be in the West On the same day that
the highest Temperature is in the East.
The first Of the principles upon which the
SSgnal Corps proceeds is, that the invariable
asurse Of air currents 10 such as will equali1s
1le atmospheric pressure upon the eArth's
ssrhaeeI. and that whenever ineqna lities exist
the wIniSare set In mOti0n, the air thWs hnding
its level-jast az wafer or any other visible Aud
does.
When storm commences IN the United States
She line Of miuinIuHl, pressure d0es not eOme
from the "far West" bat commences With the
storm, and travels with ID toward the Eastward.
There Is generally a talf Of winda tho line
OF minimum pressure, ant sometimes q calm.
When this line Of minimum pressure passes
an observer towards tha East, the " End generally
soon changes 10 the West, and the bSsrIulvtSr
begins ~ rise.
There is generally but little wind nnsr the
line Of ma ximnm pressure and on each side 0f
ahat line thl winds are irregular, but tend out
taard ham that line.
phe fluctuations of the barometer are generally
greater in the Northern aud The Western parts
Of :he United States.
lathe Nng;hern parts Of tho United states
Che wind geaerAlly, Ia great storms, sets IN
from the Earth af Rast anI terminates from the
North Ut West, aad In the Southern parts the
utnis generally sets Ia from the South Oi East
AMI tOIlnlnites frOm tbs South Of West.