Savannah morning news. [volume] (Savannah) 1868-1887, 1885-08-31
TIME OF OCCURRENCE.

oHoH " ~ p ~ rr~ -
400 to 1870 D. m ....I5 Afternoon" ........ 4
4 so 10 500 p. m III Evening ......... 4
The following are some OF the conclu-
siOns which appear to proceed from a
study of the relation OF tornAdo-centres 10
areas Of barometric minimum:
!. That there is a definite portion Of an
area OF low pressure within which the
conditions for the development of lorna
does are most favorable, and this is called
the dangerous octant.
9. That there Is a definite relation be-
tween the position of tornado regions and
the region of high contrasts In temperR-
ture, the former lying to the South and
East.
%. That there is a similar definite rela-
tion OF position of tornado regions and the
region Of high contrasts in the dew-point,
the former being, as before, to the South
and East.
4. That the position of tornado regions
is to the south M east of the region OF
high contrasts OF cool northerly and
warm sOutherly winds, a condition that
appears 10 be dependent upon the pre-
ceeding, and is OF use when observations
of temperature and dew-pOint are not &C
cessible.
3. The relation of tornado regions to
the movement Of upper and lower clouds,
presents some interesting points for
study. but. as yet, no decided results.
6. The study OF the relation of tornado
regions to the form of barometric depres-
sions appears TO show that tornadoes are
more frequent when the major axes OF
the barometric trOughs trend north aud
south or northeast and southwest, than
when they trend east and west,
CHARACTER OF H STORMS.
The rotary movement OF the whirling
AnFnaAn Gland d in rtnaFH.afn ~.
ported as against the hands of a clock,
and in six cases as probably moving with
the hands of q clock. Electrical dis
charges were observed in eighty cases, as
occurring in the clouds surrounding the
tornado cloud, that Is, ia the clouds near
the horizon; and in twenty-seven cases as
occurring IN he funnel cloud. The
width Of the path OF destruction supposed
TO embrace the distance between the areas
OF sensible winds on the two sides OF the
tornado cloud, varied, in sixty-two cases
from 70 TO $3.50 feet, the average being
1887 feet. The length of the tornado's
track, reported in thlrty-seyen cases.
varied from , to 1870 miles, the AVERAGE
being 500 miles. The velocity of pro-
gression OF the tornado cloud, as deter
mined from the reports in seventeen
cases, varied from fifteen to eighty miles
per hour, the average being forty-twO
lhG bAOA AGct AlAiG ONtuH lCu ~ Alb
tornado cloud in passing a given point
varied from san instant" TO about two
minutes, the average being about forty
five seconds.
The appearance OF thunder storms in re-
latiOn TO t~ornadOes is reported upon as
follows: In Is cases they occurred be-
fore the tornado cloud appeared, in l6
cases accompanying the tornado cloud, in
II cases after the disappearance of the
fnppnAA aloud 80 -, - 400 900 Nsra.
"during the day" Concerning the char
acter OF the formation of the tornado
cloud 1t is almost Invariably reported as
ssfunnel-shaped.n In III out OF 14T cases
where reports were rendered the tempera-
ture before the appearance OF the tornado
cloud is reported as ''warm"-thRt IS, I'M
usually warm for that locality at that
time OF day and year. In LOG out OF
1877 cases where reports were rem
dered the temperature after the tornado
cloud is reported as "cOolv or "coOler;"
that is, unusually cool for that locality at
that time Of the day and year. Concern
ing the time Of occurrence Of the lorna
does, the time OF greatest frequency Is
given as from A 10 $3.50 p. m. The state
mWhlch the g%rentest number Of tornadoes
occurred Is Georgia, followed neXt In or
der BY South Carolina and Alabama. The
month In which the largest number OF tor
AAHAA1R 1kANAANA 10 IEnAn NA lEN AnAh
does not indicate that il WAS the month or
greatest frequency, because there were
only two days out OF the entire month on
which these storms occurred.
b mont OF greatest frequency, that
is, the month embracing the largest num-
Der OF days on which tOrnadoes occurred,
Is July. The prevailing direction Of the
progressive movement Of the tornado
cloud Is gwen as northeast. or 145 cases
where the time OF rain was recorded, A.
reported precipitation AS preceding the
tornado, "a as following It, and ~ MS &C.
D0mpanying IL. OF 93 cases where the
time OF bail was recorded, 80 reported the
precipitation as preceding the tornado, 20
AS following IL, and 70 as accompanying
Il.
A RECORD OF PREVIOUS YEARS.
a previous report issued by the signal
Office, and covering nearly 600 %tOrnadOes,
showed the following relative frequency,
the greatest numb Der being in Kansas, the
relative frequency By seasons being sum.
mer, spring, fan and winter, ~ follows.
6hfa and No. TISfafss and No.. 81
IerritOTtes. sfOrnf Ierrif0yios. Storms.