The Norfolk Virginian. [volume] (Norfolk, Va.) 186?-189?, 1895-11-26
THE WEATHER CHART
Something About the Little Maps Seen In
Many Places About This ely.
ABOUT THE lsOBARs AND lsoTHERAs.
Anyone Can Soon Learn to Read una
Understand Them If Thcy Want To
They Con Then Tell All About the
Weather In Any Fart of This Big
md Glorious Country.

= d. b
md Glorious Country.
FOR the past two or three years there
nave been placed at many points In
Norfolk and Portsmouth daily small
outline maps of the United States,yet
there are compurativly few people who
understand them. By them one can
read the state of the weather In almost
any part OF the country, &c they only
knew how. and It Is for this purpose
that the following Is published:
'fhe weather map presents an outline
map of the United States and Canada
showing the stations Where weather OBJ
servations are taken daily at s n. IN. and
S p. M. sevcnty-ffth meridian, and
tclegraphcd to Washington and other
cities. These observations consist of
readings of the barometer. thermomc-
| ter (dry and wcO, direction and ycIoc-
ity of wind, state of sky whether
cloudy or otherwiSe), and amount OF
rain or snow. Solid lines, called iso-
bars are drawn through points having
| the same pressure: n separate line be-
inE drawn for each difference of one
| tenth OF an lTch In the height Of the
barometer. Dotted lines. called iso-
thermc. connecting places having the
same temperature. are drawn for each
| ten degrees of the thermometers Heavy
| dotted lines. inClusinE areas where n
great change In the temperature has
occurred within the last twenty-four
hours, are sometimes added. The dlrcc-
ton of the wind Is Indicated by an ar
row flying with the wind. or opposite
1 to the ordinary rane. and has a square
end when storm signals are displayed
Shaded areas show where rain or snow
has been falling since the last obscrva-
lion.
! The general movement OF storms in
the United States is from west to east,
similar 10 Il series of atmospheric waves
| of which the crcsts nrc designated ON
| the map Highs" and the truuEhs or
Highs and Lows have an average east
erly movement OF about GOO miles per
day.
! High winds, with rain, or snow IT cold
enough, usually prcccde the low area.
often extending to a distance of GOO
miles to the eastward OF the centre Of
| the storm. In advance OF the low cen
| tire the winds are generally southcrly,
and consequently bring high tempera-
ture. When the centre passes to the
east OF place the wind ut once shifts
to the west or northwest. bringing low
or temperature. The temperature on Il
given parallel to the east when the Low
may he reasonably looked for on the
same parallel TO the east when the Low
| has passed. and frost will occur along
and north OF an isothcrm OF about %
degrees. If the night is clear and there
he but little wind. Following the Low
1
nu'..I .o;,cs an arca ol iilSh' prinS
t. ,S =, .' ra,,. MIi'l'cI. Wh,th III its
'" ~. u, ioiioMcu ~: uno'her low
80 ,iit III , n..iiu u lew Rchera.
| movement OF the Low and High. with
tn,ya,.d IT, - nv. WY I'm 'iie ii,s!.
chnno,, ~ ~, Su'',ias Wc'thet
,hn 49,, ny, oe 1891 "E E'uhcc al
os MI, 80 a, :" i i'nM no nov.
fol,ny t,,n, .ro,o,."i ,,;r,,,,io,, ms. w.
io, ,a,s,,,.n s,l,', W., Ais'iS "i
so,,,, ss 80. 80. 10 ,'.ohc ~ me
,;ns'+o ,ho Ni,,s;si, NJ i,.,NA ni"un-
G;,.aet ion -, - ~ ,,,, ".'u 'u"n ct'nEc
nnstarn hoir nr ti,o -" y, w"S' 'nDt 'Ho
Inc chr nr NIoxico nnn,,.,tn ILL., M .'. u,
4, thn ,,.o.t ~ ,r,,.,h 20 ',.l'', .luNr
rn,rbInI tbn 900, W mn"'' put "l,cr
chnn,ra f,iroiior on5 49,, fri'tns
en- stward IJi~h n,on. " ny horth-
.onthaet ana or, ,t,n, ,iivte !" IN"
cold weather 4 cold 49,. Wy '"'r n,,,'