The Lake Charles echo. [volume] (Lake Charles, Parish of Calcasieu, La.) 1876-1898, 1888-01-20
YYnArIrErl 80.
MEOw General and H40eRl afoFnaAs
are FOreaOasi Am Amsi@hf late
the Reading of tRae aaane.

WU dlaPNheu w BANV kANAA "Nt9AAtIs
aud study tothe weather mapsreeeiyed
and posted BY DR., W, A, Knapp, Of
this city, the following general infoF-
nation upon The subject from Mr. r,
Z, Kerkam, the signal officer Of the
Louisiana weather service will be
found unusually interesting
In order TO understand the asmos-
pherle changes II will be necessary to
call attention to the weather map Of
signal service that is made up from
weather observations taken at I q, M,
roth meridian time, at nearly all
stations Of the signal service 10
the United States, and that shows
tho pressure barometer readings)
and temperature Of the air direc,
tioa aud velocity Of the wind, the
state og the weather. and on The
rght hand side a column containing
the rain,fall in the past "a hours
The aabroken lines traced thereon
arc lines Of equal pressure, called iso-
bars. The dotted lines are linea Of
equal temperature and are called iso-
therms. The curvature Of these lines
vary greatly from day TO day, ewing
10 the unstable condition Of the at
mosphere,
The pressure Of the air at sea-level
is thirty Jpohas, but on Pixies Peak i
only measures seventeen inches eonse-
quently there must be correction ap.
piled to theao aotaal reading Of the barom-
eter for the elevation Of the ground
above sea,leYet, so that an intelligent
comparison may be made Of the vary
ing air pressure. All barometer read
ings on these maps are therefore cor
Teotod and reduced 70 sea-leyel,
The terms ''highp and dow seer
on the map, represent areas Of high
and low pressure. A line epciFcling
the term Hhlgh" shows that that sec
tion has an air pressure greater than
the surrounding sections, and the
figures found at the terminal Of these
isobaFs show the hight TO tenths Of
inches,
Water flows from 9 higher to
leWar level, and 50 the air flows fEom
a high 10 a lower pressure, II theF'
is a ahighn Of ao6 inches in tbs
northwest and a 'lowp 81 a9.s owe
the south Atlantic States, brisk north
westerly winds with falling tampeFa
tura would prevail in al States from
Tennessee 10 Southern Dakota,
A 'ihighp consisting Of dense coo
air, must, necessarily, lower the ten
peratnro Of all sections in lis Yiclnit
and over which II passes since tho al
from such an area flows outward se
ward lower pressure.
The ''loWn Or eyelopie disiuFbanc
may spring up anywhere If the cond
tons are favorable. Tho initial caut
Of q 'aown q higher temperature
the central than the exterior part
some local temperature disturbance
cause an initial ascending current
air tsinre heated air rises), and thi
heated air Is replaced by the low GU
rents and DETECTED by the eaFlh's Fe
tationr giving rise to 3 gyFalory m'
tion Of the atmosphere causing u
gIow.p
The general tendency of these area
1 Is eastward, and since their power an
progression depend greatly upon th
mqlsture III lile air, it is very hkel
that TIC majority of Che flows form
ed in the northwest are attracted b
Tie chain Of lakes between tho Unite
States ana Canada and move or
through the ST. Lawrence valley,
The rain area is generally found !
ADVANCE of the center 81 Hlow,H AZ
upon the intensity Of fthe latter great
depends lhe section Of coHntrg ailec
ia thaFebg. Ifthere 4 Nlow'' af 29-
covering Dakota and 4 ''higlla of s9'
% tho Maine coast, itisgeFy pFebahI
that the section norlh ef Iennesse
and wcst IF Pennsylvania q MinnesoI
will be atFeelea thereby ip hagiag PF
gailipg caaterly winds higher tsnpe
J ainte ana cloudy weather. wlth re
abonl 800 miles east and Reatheast
lhe depression.
+ General storms arc more iFegAs
!, and gcll defined dpFlpg the laie 4
4 winter ma pghy spring, Ahs a
D uayo seasopl, while ths loeal stSF
4 aFe peepliF 70 tbs garm seasep,
"a When lecal rains aFe PFedIeled
N iliis ~ any qlheF state, the lAsa
s Is meanl g be conveyed IS that
. loeal conditions aee iagorabls te
auce exccasyo clou8ipeas aaa eql
81 qaeai rains but iliet i'ege F NJ
We ela| cyciea5c lslQyssqea aliestii s
Aeim gaoited iipss oa
AZ lle o epFsalaFs