Daily Kennebec journal. [microfilm reel] (Augusta, Me.) 1870-1975, 1891-11-13
OFFICE OF TEE
s, WEATHER BUREAU,

UFFIcE OF TEE
| U. s. WEATHER BUREAU,
PORTLAND, Me, Nov. ~. 1891.
| All those who are interested in meteor
! ology or The work OF the weather bureau,
as sdmirisered by the department Of asri-
! culture, are cordially invited to cali at the
weather bureau oftice, on the fourth foot
Of the First NAIioaal Bank building
Among the books in the library furnished
| by the government are scientific and pro-
| fessiousl papers which are very interesting,
| also rainfall and temperature charts,
! weather maps AMI records which would be
Of crest value TO any one desiring inform,-
tion in regard t1 the climstology Of any
secfion or vicinity whsre observations have
| been carried on.
/ Pas;icalsr attention is invited to the daily
weather charts issued from this office, as
| beng instructive TO msny who have access
TO them. They arc posted i1 many public
| places. furnished to the city schools, a. d
! mailed to institutions Of learning through
Out the State.
| The chief of the Weather Bufesu has
| decided 10 distribute these charts, AS widely
| as possible, in order that the intelligent part
OF svery community msy utilize them by
making special anu locai predictions. The
follow ing explanation taken from the report
of the chief Of the bureau is given for the
| benz Il Of all
| These maps not only contain the fore
casts prepared in Warrington and the local
fore css:r, but sl.o the da'a shich the
foreca are based, SO that they may be
studied and persoDsl conclusions drawn b.
| everyone engaged in any profession or
| business affected ~ the weather, and this
includes all classes of business.
! TIE dsis embodied 10 tee maps are the
| sir pressure, the temperature at o'clock
A. NJ 18th meridian time, the mioimum
| temps ralures, wind direction and velocity,
| the character of the weather at the hour of
| observation and the amount Of rain or snow.
| As soon as the charting of these data is
, completed the isobers Qiues connecting
places or embracing sections Of equal air
p;e.sure) are drswa for each tenth of An
inch; i,otberms dotted lines connecting
! places having the same degree Of temper.
,ure) are drawn for each ten degrees the
section or sections Of country having the
highest or lowest air pressure are
| The former is anti cyclonic and
ide latter cyeionic in its ffects, or in other
words, the area covered by high pressure
>- Gather, whereas the reverse is the case in
! advance of and surrounding an area of low
| pressure, where rain or snow aud cloudi-
u@ss, With = comparatively high tempers
, tute prevail. The dri't OF the atmosphere
eaiuy from west to east, th' ohsrting Of
these cyc,oric and sntl-cyclonic areas, by
/ lsobers, is necessary TO snow at glance
7 their respective centres and the direc ion in
hipf1 fbnx hoafipo uParhipaliu
! tray ed by he curvature Of the seyeral un'
! broken lines, and BY the arrow showing the
wind direcuou, the air flowing INTO the
Low" with spiral III yard motion, con-
| trsry to the movements Of the hands Of
watch, aud Gus Of High" with the hands
! of q watch,
! After little study on the put Of the
! intelligent observer 1t is evident tina. the
| nearer the areas of high and low pressure
sie to each other aud The greater the diff
( ference 10 the pressure, the more rapid will
| be the fl w OF air from ibe greater TO the
lesser pressure, Ihs Isothesms (tempera.
tare lines) vary according to the i.obars.
| II a low pressure area 10 sdvat eng
eastward over the middle lstitudes and
a high pressure sres 10 moving east
ward from the Jar vest or northwest
I tn isotherms will assume toward the per-
pendlculsr If the conditions are static, ie.,
| thst there is but little vAristion in the pres
sure, the isotherms will appear ia q neatly
ho;izontsl position, according to the lati-
tute. Ccld waves, weather and tempera-
tu,e changes, the probability OF thunder
storms or severe local storms are easily To-
ca,ed by giving the daily weather maps
m omens's ssudy. The several laws OF
storm will gradually unyeii themselves to
the mind Of The student Of the map and the
apparently unite lligihle mass Of lines and
| figures of a day becomes ihs gaide for
business transactions Of any character.
That severe locsl storms occur in the
southess. quadrant of a low pressure area;
that the wind will back from southwes, to
northwest, # io~er pressure moves south
| of given place or shifts ftom southeast 20
nor vest as she storm moves north Of the
place tn II ths temperature rises in advance
of \ storm. ard falls sf'er it has passed;
that storms generally move IA the direction
of the greatest rainfall or snowfall or
where the sir is most humid are oil fsctors
! evolved by study Of the maps
| The maps issued 81 Portland contain an
explanation of the NET. OF o.ogicsl features
! stfec ing this dis.iics.
E z. JoNzs,
Observer Wea'her Bureau.