The National tribune., 1889-07-04
THE WEATHER.
Notable Occurrences for the Week Ending June 90
1850.

| ''N'e"sS 'Va hnS "hVh hnolHk 1uHe 10
1850.
| ny LIEUT.. J. p. FINLEY, U. q. SIGNAL SERVICE
| Correspondence invited. suggestions desired
ahd information chcerfully furnished. Every 81
Tort employed To make this Bureau OF practical use
! To the readers Of THE NATIONAL tribune. All
communications should be Addressed Weather
The NATIONAL TRIBUNE Office. Washington. ID. O.
Lows. OR AREAS or WARM. MOIST AIR, CLOUDY
WEATHER, WITH GENERAL RAIN OR SNOW
AND HfGH WINDS.
Two such areas affected the weather of the
United States both Of which came from the
Northwest Territory, north OF Washington
Average progressive velocity eastward IA miles
per hour Average duration days.
HIGHS, OR AREAS OF COLD, DRY AIR AND GEN.
ERALLY CLEAR WEATHER, WITH MODERATE
WINDS
Three such areas affected tho weather of the
United States. Two came from the North
Pacific coast and one from the Northwest Ter
rit0ry. One OF the former remained practically
stationary on the Pacific coast du ring the week.
Average progressive velocity eastward 12 miles
Average duration days
Temperdture.-The greatest fall in "a hours
t22'l occurred Mt Fort Buford, Mont, on the
23d. The greatest rise (i8o) occurred at Pueblo.
Colo, on the 23d, and at bismarck, OAK, on
the 9th. The maximum ul0o) occurred at
Yuma, ArZ.. on the 23d. On tho 9th the
temperature rose to 1902 at Fort Custer, Mont,
and ut Fort Buford Oak. on the 9th and 28th.
The minimum 1857 occurred at Mortified, VT,
on the 25th.
eyery State and Territory except Utah. The
heaviest lover one inch in "a hours) was re-
ported from Florida, Texas, South Carolina,
Kansas. North Carolina, District OF Columbia,
West Virginia, New York, Louisiana, Michi-
gan, Wisconsin, Illinois, Kentucky and Geor-
gia. The maximum in "a hours (2.9O inches)
occurred Mt Savannah, Ga, on the 27th aud
2sth
Winds-The highest winds 40 miles per hour
and overl were reported from Montana New
Mexico, Minnesota. Kansas, Texas Washington
Territory and Dakota. The highest measured
velocity ga miles per hour occurred ut Fort
Cauley, Wn. T., on the 18th.
Ripers.-The maximum rise ga inches) oc-
Cured at Little Rock, Ark, on the cath. The
maximum fall (42 inchos) occurred at Nash
vile, Tenn, on the 25th.
Existing Conditions. principal lo,O ia locat-
cd in the Northwest Territory just north Of
Montana. A small low is developing in south
theFn California. The principal high is central
in Pennsylvania. Another high is approaching
eastwardly from the North Pacific coast. Rain
IN the northwest and along the South Atlantic
coast Elsewhere generally fair weather
Facts 70 be MISUNDERSTANDING meteorologi-
use of the word nimbus in cloud nomenclature,
aud In some quarters an unfortunate confusion
has arisen from the uncertain use of the term.
Every kind of cloud from which rain falls is
ninbus, and there are practically two sorts /: "a
cumulo nimbns, the rocky cumulus cloud from
which rain falls in squalls or showers (2) pure
nimbus, a natter cloud, moro like tho heavy
strat0-cumnlus that forms from or under cirro-
stratus in front of extra tropical cyclones. How
ard calls nimbus "a cloud or system of clouds
from which rain is falling. 1t is a horizontal
sheet above which the cirrus spreads, while the
oumulus enters it aterally and from beneath"
Hildebrandson uses the word in more con-
tracted sense, and reserves the name nimbus
for the lower layers of dark, torn clouds from
which rain falls. Paey calls the same broken
clouds fractocumulus Weibach designates
by nimbus tho property which cloud mani
tests To be or TO become u source of rain in par
ticular circumstances. The reason for making
nimbns class OF ITS own comes from the fact
that sudden, striking change comes over the
appearance of the upper surface of cloud the
moment rain begins to fall. the precise nature
OF which we cannot at present explain.