The Osceola times., 1881-02-19
The Remarkable narumetrie Pressure.
v I0GI, EeTublIca


Tie Remarkable Barumetric Pressure.
-, Lagi, Republican.
The great waves of high barJmetric
pressure which. since the middle Of Nov
yembyr. have chased each other in rapid
succession across the American continent,
indicate the prevalence OF very peculiar
atmospheric conditions over the North
eu hemisphere. During the season Of
summer and early autumn the pressure
over the Northern hemisphere j. relative
ly very l0W-much lower than il is in the
same season over the Southern hemls-
phcrr. especially II We take into account
the oceanic character Of the latter and
the enormous mass of vapOr in the air
south Of the equator. This phenomenon
l. lre % the prepondercuce IF land sur
face i'm our half Of the globe, which, when
heated by the summer sun. purlticS the
air resting on il and cXpels ii in part be-
y0nd it, maritime borders Autumn
therefore finds a. it, shadows begin 10
creep over the higher American and
Asian latitudes, the continental interiors
drained Of their atmospheric pressure; so
true j. that. that the British Arctic eNpc-
dtion Of lN45, exploring British America
near llud~pn's bay, reported mean pres
sure wa, lowest in November This
wear. however. before the autumn closed
the atmosphere was abnormally massed
over the northern half Of this continent
and the enormous baromctric areas ot
high pressure began 10 descend over
Manitoba and our Northwest. "NIHc
such areas the signal service reports,
prevailed during November, 1850 only
two of which were eucroaChmeutSo Of the
area Of high pressure from the North
Pacific ocean The greatest Of these
waves. starting November -. wa, ap-
iarentlY am outflow Of dry, cold air from
Saskatchewan or Manitoba, it SAYS. "and
moving Eastward wa, increased 10y an adj
liti1ual outflow from lluison's Bay ter
ritorv. 50 that while the center remained
nearly stationary i'm the Ohio valley dur
ing the 34d and 2}d. the pressure at Gin
ciuuati rose % 30.~ inches. or g.67 above
the normal. the highest pressure ever
noted Al that station such an acrumu-
lation of dry aud frigid air over the re-
giou west 81 Hudson bay. So early in the
winter. indicates the operation Of forces
iu that region the intensity ot which, few
if any If the most accomplished meterOl-
Ugi,ts would have been likely 90 autici-
pate. But these November waves, cn0r-
nous a. they We're. have been exceeded
hy those Of December. which brought NJ
one Of the most memorable cold periods
recorded in American meteprolugy.
The fact has long been known that the
high latitulcs uf the continental inter-
iors. such "a, Manitoba and the great plain
Of Siberia. are the birth-plJces Of these
gigantic meteor>, which in their south
ward march spread over and refrigerate
q whole country at the same time. Doubt
lc-- thcy are generated during period, Of
excessive terrestrial radiation. and c-pec-
iIllv i'm the absence ot a yappr-laden at
mosphcrc The high latitude- was favoI-
able for their formation. not merely be
cause Of their proximity 10 the polar
basins. bat chiefly because being remote
from the yapor-beJr,ug Southerly winds
the air superintendent upon the soil i a
free medium through which the soil j.
enabled to rapidly rJdiate it, heat into
the higher atmosphere and Ultimately in
t stellar space. II would appear from
these data. therefore. that the present
season l. one of great aridl'y in British
America, and the soil, probably but seam
tilv clad with the usual winter snow
mantle. is now freely ullJtiug it, small
surplus temperature" If any such remains,
into the outlying regions of 81 ace.
We're there no other considerations for
the early extension Of weather ob~crya-
tiJu- into Manitoba. the iuca,Cu.ahie adj
yantaEeS 90 tha I uitol states Of early
prcmouit.ou- uf tine winter waves now
rolling over rs demand such extension.
Had We a few hygr1metrin and b9romet-
ric reports from the trau>->gsRatchcwan
district indicating the march uf the sea-
-uu- and tle presence there of any alb
normal WUicJrul1gic condition. the prob
lem of iYrrra,tiug the generation and de-
scent of these terrific frosty spell, would
bee very simple and approach might
Doe announced several DAYS, perhaps
whole weeks. prryiou- to their arrival on
our northern frontier The magnitude of
the Interests involved i'm such weather
warning will proupt the earnest public
desire That the genius Of Gen. lIazcn, the
new chici signal officer, may speedily
strike 9It some method of ,clcerlphir
communication with this region, in
which lia, the .Euliau cave Of our lev
winter winds