This text was obtained via automated optical character recognition.
It has not been edited and may therefore contain several errors.

---

September, IS 15.
MONTHLY WEATHER REVIEW.
457
We shall first consider the meteorological conditions and special features attending the hurricane, and then take up the issue and distribution of warnings by the Weather Bureau, the action taken to protect lives and property, and the value of the warnings.
GENERAL METEOROLOGICAL CONDITIONS.
Tuesday, September 28, 1915.—Early in the morning a few cirrus clouds wero seen at New Orleans spreading over the sky, coming up frcm the south; by 10 a. m. (90th mer. S. T.) the entire sky was covered with a cirrus veil, below which were about 4/10 strato-cumuius moving rapidly from the northeast.
At 11 a. vi., there was 4/10 cirro-stratus moving from the northeast and 2-/10 cumulus coming from the east, the higher clouds were obscured. By noon the cirrus had largely disappeared or were not visible, the strato-cumuius had- decreased to about 2/10, and the sky was covered by cirro-stratus moving from the south. At
1	p. m., there was 1/10 cirrus and 3/10 cirro-stratus, all from the southwest, and 3/10 cumulus from the east. At
2	p. m., about 3/10 of the sky were covered by cirrus streamers coming up from the south and spreading to the north of the zenith; a few cirro-cumulus were moving from the south, and there was 3/10 strato-cumuius moving from the east. At 8 p. m., there was 4/10 cirrus and 3/10 cirro-stratus, all frcm the southwest, and there was 1/10 cumulus from the east. By sunset the cirrus veil had increased in thickness, merging into thin cirro-stratus and covering the entire sky, which at sunset was a faint brick-dust color, with a heavy bank of cumulus in the east. From sunset to 10 p. m., the sky was covered by a veil of high clouds as shown by observations of the stars, very few of the latter could be seen and those were of a peculiar copper tint. From 10 p. m. to midnight the thickness of the clouds gradually increased.
Wednesday, September 29,1915.—By 3 a. m. of the 20th the cloud cover had increased in thickness and was mainly strato-cumuius moving rapidly from the northeast: occasional heavy rain squalls occurred. By daybreak the clouds had increased in thickness, about 7/10 were typical nimbus and 3/10 strato-cumuius and scud moving rapidly from the northeast. This formation of clouds continued all day and into the night, with heavy rain most of the *ime and excessive [see p. 493, Table ll] during the larger portion of the day. After tie passage of the storm center the rainfall gradually decreased ir. intensity and the clouds decreased somewhat in thickness r-r-}:* until at”midnight the rain ceased; but the sky was still( covered with stratc-cumulus clouds moving rapidly from the west.
Thursday, September 80, 1915.—From midnight until 7 a, to. the clouds gradually decreased in density and the strato-cumuius gave way to aito-cumulus and cirro-stratus covering the entire sky. At 9 a. m. the sky was
\ towss*"
V cV
From 7 p. m. of the 28th to 7 a. m. of the 29th tho barometer fell 0.18 inch.
During the 28th the barometer fell rapidly from 29.54 inches at 7 a. m. to 28.11 inches at 5:50 p. m., a tall of 1.43 inches in 10 hours and 50 minutes or slightly more than 0.13 inch per hour. From 3:10 p. m. to 5:50 p. m. the barometer fell 0.90 inch, or at the rate of more than 0.33 inch p-?r hour, A trp.ee of the barograph corrected and reduced to sea-Isvel from observed readings of the mercurial barometer is reproduced in figure 5 on chart xliij-114. Table 1 "ives the readings of the mercurial barometer (rcduced to sea-level) taken at 15-minute and 5-minute intervals. The readings were taken by Mr. Coberly and Mr. Harder, except that the 5-minuts readings were -all taken by Mr. Coberlv and the instantaneous fluctuations as' indicated by the movements of the barograph pen were noted by Mr. Harder, and I took the readings from 10:30 p. m., of’ the 29th until 12:30 a. in., of the 30th, and Mr Coberly continued them until 7 a. m., of the 30th. The wind velocity and direction were taken from the triple register and are given at the time of each barometer reading.
Table 1,—Reduced pressure, barometer fluctuations^ and wind velocity and direction ai New Orleansy La,t Sept. 29, ISiS, 10 a. m. to Sept. S0f 6:55 a. m.
Time. (90tb il. S, T.)
Mt. Sepl. t9.
k- M,
10 00 .. 10:30.. 11:00.. 11:15.. 11:33.. 11:45..
12:0c,:
P rss&are.
>ocu.
F. K,
12:15	.....
12:E0..........
12:45__________
1:0ft...........
1:15...........
1:33__________
1.45...........
2 Xi...........
2:15............
230____________
2:45...........
3:0C...........
3:15...........
3:33...........
3.45...........
i 00 ..........
4:15...........
:3C..........
entirely clear of clouds.
V"
s*-*?
FBESSUHE.
,0 -
fV<.U
vJ* b
From Sept,ember 22 to 25, the fluctuations cf the barometer show nothing more than the ordinary norma: diurnal changes. The faint rise ir. the barometer which is supposed to precede the gradual fall indicating the approach of a hurricane did not occur. A gradual fall in the barometer commenced on the morning of the 25th and the fall amounted to about. 0.10 inch in 24 hours until noon of September 28 when the fait became more rapid.
4:00.... SOS.. 5:10. .. 5:15....
5:3C...........
5 35...........
5:4?.
8:00..............
e-os________ ..
8:1C.............
m;...............
S"23
625..............
ft 30.
6:35..............
6:40..............
*:45............
£:5C.............
S.55...........
7 30.............
7:35 ............
710..............
7:15.............
...........
7.2«...	..
~;.*d...............
Inches. 29.40 20.33 2S\30 29.25 29.24 29.19 29.18
29 15 1*9.14 2S. IS 29.10 29.09 29.08 29,06 29.05 2S.C-23.98 23.94
28.33 28.90 28.87 2S 81 28.75 28.68 28 56 28.53 2S 44 2S.39 28.3?
28.34 28.28 28.23 2S. 17 28.16 28 15 28.13
2ST3
28.14 28 15
28.14 28 15
28.17 28.1?
28.17 28,19 28 19 28 23 2S.28 28 28 28.31 28.33 28.35 28. 3S 28. 41 2S 44 28 54
■Wind.		Flucta- A f Vrt*4E' itl	Observers.
Velocity.	Direction.	tll’XOus 111 pressure.	
AR/*f. 3?	ne.	Inch??.	Ccbo.rly * Harder.
48	ne.	0.02	Do.
38	ne.		Do.
43	ne.	Slight.	Do.
53	H6.	0 01	Do.
34	ne.	. .	Do.
46	,ne.	0.05	Do.
48	D6.	0.03	Do.
49	ne.	0 01	Do,
46	ne.	0.01	Do.
54	0.	0.02	Do.
50	e.	0.01	Do,
49	e.	0.01	Do.
44	0.	Steady.	Do.
44	ne.	0.01	Do,
50	a.	0 02	Do.
50	0.	0.02	Do.
54	e.	0.03	Do.
5S	e.	0.02	Do.
52	9	0.01	. Do.
54	e.	Steady,	Do.
48	0.	Steadv.	Do.
52	e.	0.02	Do
63	se.	0.03	Do.
60	se.	Steadv.	Do.
66	se<	0.03	Do.
72	e.	0 02	Coberly.
72	e.	0.03	Do.
7fl	sa.	0 03	Do.
•" 86	sa.	0,02	Do.
75	se.	0.02	Do.
70	S6	0.03	Do.
70	se.	o.o;	Do.
62	36	0.02	Do.
44	se.	Stsadv.	Do,
42	58.	0 tK	Do.
46	3e.	0.03	Do.
44	se.	0.03	Do.
50	3.	Steadr.	Do.
50	se.	Steadv.	Do.
60	so.	0.S5	Do.
44	$6.	Steady.	Do.
45	se.	Steady.	Do.
48	s.	Stoat1 v	Do.
42	se.	0.02	Do.
33	s.	0.02	Do.
34	s.	I 0.02	Do.
31	$Vf.	Steadv.	Do.
32	sw.	Steady.	Do.
36		Steady.	Do.
* 31 33	sw.	Steady.	Do.
	Variable.	Steady	Do
39	sw.	j Steady,	Do,
3S	sw.	Steady.	Do
38	s.	Steady.	Do.
38		Steady.	Do.
29	sw.		Do.