Deseret evening news. [volume] (Great Salt Lake City [Utah]) 1867-1920, 1906-07-04
CAUSES THAT BRING
OUR LOCAL STORMS
Students Make Records Showing
Approach Of Atmospheric
Disturbances.
MORE ABOUT CYCLONES
o..,omena That Concern Everyone
ponuIarly Explained in Nature les
sons at the University.

sons at the University.
-, observations for the 10 days
..s,rg Friday. June %, emitting Satur-
a., and sunday made BY the nature
- class Of the University Of Utah,
..r. reported IN class yesterday All
80 that the barometer fell with
- regularity from 264 inches on
T~n, Il to 25.2 on June 81. On June
-, IN, barometer read 1858 and on the
s.,t Friday, 25.5. These readings were
s,s,.seent. There vas fair and calm
thor eliminating On 8 storm on
,rednesday and Thursday, the az"
eschinr storm being Indicated by The
s'Nlng barometer But low barometer
t-5ls9,es d light atmosphere, or air
~, Is rising. while a high barometer
,.Ji,ates heavy or falling ain and
t"nsf1ilent dry weather. The facts corr
,osrooded with the barometric ind.ca
lions. fair weather both preceding and
following the storm OF last Thursday.
storms are predicted chiefly hy the
action Of the barometer. for reasons
hat we're then explained
4 SALT LAKE STORM.
Z. Was shown that Il a storm origin
atts In salt Lake valley, there win be
erst Of All layer Of warm air lying
reyt 10 the earth and the lake. anu
heoming heated and somewhat satur.
sted with moisture. This layer Of air
Min lie still until some Disturbances
wind from without the sound ot ar,il-
larry. thunder. etc.--disiuybs the oquilih-
rum. and the warm air begins 20 rise.
making the afr light over the valley be-
cause II the upward movement, and In
d.taled by a falling barometer This
air gill rise til IL is cooled 20 the point
al Precipitation, and then The rain viii
nj and the barometer NH rise again
haust the air has become heavier by
losing It's moisture and by becoming
cooled
TROPICAL CYCLONE STORMS.
The greater storms that originate
within the tropics but not in desert ~.
gious are nearly always accompanied
by rain There Is good reason Tor
thinking that these cyclones generally
spring up In the gone Of Gains, much
as The desert whlrls begin for they
sem never 70 begin in places Of well
established wind currents but rather
DID q place OF quiet, weak, or variable
winds. Il is only during timH Of
9agnation when the air has - eStab.
fshed motion. but stands aloSt idly
o. II waiting for command 20 move
on. that the lower air may become very
warm and very moist, and ready for AN
Oerturning. A calm usually precedes
art a these storms at sea the air be-
cmcs close and oppresslvely warm;
fle water settles down 10 a CLASSY sur
hcc-theSe being the conditions that
ause the cyclonic storm. Here the
,rs4 Of disturbance is much greatri
Naa on the desert
AMOUNT or HEAT.
ThUe ia lower temperature Of the
heated air next 10 the water surface
Nus much greater amount Of heat In
MS air because Of the vast amounts
q latent heat stored in the evaporated
uattr held in suspension IN the warm
an. every pound Of water that eyap'
caies takes IN 1000 degrees Of heat
without any rise IN the temperature
n the vapor or OF the air that holds
u. This vapor then absorhs much Of
the SUMS heat that would pass on the
desert 10 the dry sand. and SO the depth
Of The heated stratum over the water
4 much greater than over the land.
Most Of the heat reflected back from
he water Is likewise caught by the
moisture, which Is not nearly 50 dla-
ihemous Cpenetrable by hcau as dry
air IS. While therefore. the temperd-
lure II the heated air next to the des-
on Oess than five feet high often rises
70 40 or $50 degrees +. close 20 the
ground. that over the tropical seas
rarely exceeds IS degrees. Neycrthc-
less. the sea afr contains by far the
greater amount ~ heat, as Just OK
rl8inci. for what the sea air lacks
IN sensible II makes up In latent heat,
md what II lacks In actual heat 10
makes up in amount or depth of the
alr that Is warmed.
WHY MOTION BEGINS.
How the sea-cyclone begins that Is.
what begins the upscttlng Of the air
strata, is not entirely known Prob
ably one place gets a little warmer than
surrounding spaces and a gentle cur
rent begins, which viii be sure 10 in-
crease in rate n once started. Prohab-
ly an excess Of vapor In one spot will
cause q rapid upward diffusion OF va
tor and thus begin the air current. The
Napor o. water Is l23 times lighter than
slr az a temperature Of 90 degrees. and
lhlugh The difference would be rather
Iess al higher temperature. stn the
weight OF pressure of air mixed with
Napo ls always less than thar Of afr
I'ss iuly saturated. But when this
moo.sl ar reaches and altitude where Il
"Hl pVndtnse us moisture into q cloud
eyer ana thereby warm the surround
liS ar both by the latent heat which
lne moisture gives out IN condenslng
slI ON catching the SUMS rays and Il
nalpens mat any breeze penetratcs
.n'' mass OF warm. moist. rising air,
.H,A me cloud viii soon condense into
W.. great amount of heat win DO
nDeraledand the interior body Of warm
au wen be continuously warmed by
,h' h'at given on by the coudensing
moisture.
WHAT is LATENT HEAT
IL u not exactly correct 10 speak Of