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September, 1915.
MONTHLY WEATHER REVIEW.
40'J
Table 4.—Readings of aneroid barometer at Morgan City, La.
(Con’ectior., perhaps +0.C2 inch.',	’
Time (SOth M. 8. T.).
Stpt. IS.
i.M.
4:10...........
7.-03..........
S:00............
8K»...
10:00 .........
11:00........
1100, noon.
T. H.
1:00...
2:00...
Aneroid barom- eter.	Time.	Aneroid barom- eter.
	' Sept. f$.	
Inches.	: p. M.	Inches.
29.53	i 3:00.		29.06
20.56	» 400....			29 05
29.53	; 5:30			29.1C
20.50	: 8 U0		29 U
29.43	J 9:0:)				29.24
29. 38	• 10:00		29 31
29.30		
	i Scz-t tO,	
29 20	3:00		29. bC
29.10		
			
Mr. Squires reports that the wind blew hardest from a direction 2 to 4 points west of north about 4 p. m. to 4:30 p. rn., and went to the west about 8:30 p. m. His barometer reads, at ordinary pressures, 0.02 inch lower than the Weather Bureau barometer at New Orleans.
The following barometer readings were taken at Bay St. Louis, Miss., and furnished by Prof. Pierian ScEgrWTof ew Orleans, who was spending the summer at that place:
Table 5.—Readings of an aneroid barometer at Bay St. Louis, iiiis., bv
F. Schajjfter.
[Correction, see tsxt.l
Time OCtoM. S. T.).	Aneroid barom- eter.	Time.
Sept. t5. A.U.	fnchss. W 60 29.48 29.34 29.14	Sept. tO..
11,30				
u< 8:00					Srpt. SO, A. M, 145	 '	 8:00. 				
		
		
Annc;J
Vrom-
ater.
Tnc-itt.
29.12
29.
29 56 29.52
Prof. Schaffter says that the lowest barometer occurred at 8:00 p. m. of the 29th and is represented by the reading given. The aneroid barometer he used is a good one, and at ordinary pressures it reads the same as the Weather Bureau mercurial barometer at New Orleans. I am of the oiiinicn that a mercurial barometer at Bay St.Toms wouklliave shown a pressure onrfiout 28.90 inches. The actual readings given bv the aneroid show abaro-
metric gradient of 1 inch in 50 rFTTr^T Bay StTXoiiis, Miss.,"is eastToT ar-d a little north of New Orleans.
The following table gives aneroid barometer readings during the hurricane, September 29, 1915, which were made in New Orleans at' Stanley Thomas hall, Tulane Universitv of Louisiana, by Prof. W. B. Gregory and Mr. N. C:Curtis:	'
Tab&b 6.—Readings of an aneroid barometer at Tulane Vnivorrlit:, Sept. f.9s 1915.
Tirce (90lh 11. 3. T\>.	Aneroid barom- eter.	rims.	Aneroid baioni- eter.
A. H	fnzhes.	F H	IntXet.
&30		29 60	2:16 		29 1C
5:05	 				29 So	2:30		2S.CS
9.30		2fi 52	2;;& 		 . .	
1C:30	 		29.45	2:40= 		29 01
10:50		29.38	2'45			29 00
11:00.		29.40	3-00 . - -	2S 97
11:13		 		29.36	3:10		2S 9:
U;30		29.30	315.... 		28.93
12:00, ccoq		29.30	1 3:30 		2S.93
12:40 .. 		29.23	i 4:00		2S. 76
		4 30			28.56
S',			2S.35
1:00		29.20	5.15	 		^ 2b
1:20		29. i?	5 30 , 		2s. v
1 45			99.'.4	'122		ic
Tulane University is 7 miles west of the local office, Weather Bureau, and 1 mile north of the sugar experiment station, the grounds of Tulano University and Loyola University are adjacent, hence these records will be of value in connection with the wind directions re-
Eorted from the sugar experiment station and from oyola University.
WINDS.
The wind gradually increased during the afternoon and night of Se'piernbsr 28, the prevailing direction being from the cast and oscillating between northeast anci southeast; the most frequent oscillations were toward the northeast. From midnight to 2 :45 a. m. of the 29th; the wind was blowing steadily from the northeast with a velocity of from 17 to 18 miles per hour. From 2:45 to 8 a. m. the prevailing direction was east, oscillating occasionally between northeast and southeast; when the wind changed from northeast to east the velocity increased to 25 miles per hour, and a maximum velocity of 34 miles per hour occurred for a period of five minutes at 3:50 a. m. At 8 a. m . the wind tucked to northeast and continued from that direction until! :1Q p. m.; from 1:10 p. m. to 4:15 p. m. the prevailing direction was east, oscillating at frequent intervals to the southeast; from 4:15 p. m. to 5:20 p. m. the prevailing direction was southeast, but there were intervals of three to five min-ut'ss with the direction from the east. From 5:20 p. m. to 6:30 p. m. the wind •was steady from the southeast. The wind’shifted from southeast to south at 6:35 p. m. and to southwest at 6:45 p. m., continuing from that direction during the night. The velocity now subsided rapidly, falling below 30 mis./hr. during the hour ending at 9 p. m.: however, maximum velocities of 32 to 36 miles were recorded in each hour from 11 p. m. of tho 29th to 3 e. ra. of the 30th.
iV e:.- 7.—Wind velcdiies &nd directions at weather bureau, New Orleans, La., Sept. 29, ISIS.
Time.
Midnight (28)-2:45 a. m......................................
3:50 s. m....................................	..	..
5:4$-8 a. m. ............................................
7-8 a. =.................................................
5-9 ft. IE...............................................
S-1C a. m................................................
:o-n&.n:
U-noos...................................................
Koon-1 p. e........ .....................................
i io p m.................................................
I ? p. 3.................................................
2-3	p. m.................................................
3-4	p. m.................................................
t:l4 ?. m................................................
5-C p. m ................................................
S35 F •=■................................................
6:C5p.n............ ...	............................
£-7 p. 3!................................................
?S p. a..................................................
NE.
E.
E.: ne.,S9 E.
NE.
NE.
NE.
N3.
N2.
o.
E ; se.
E.
17 to 18
SB.
3E.
SE.
S
sw.
S3.. SW, SW.
41
39
43
45
48
53
54
W
56
54
72 1 86
1 E-SE.
The wind velocity was 50 mis./hr. or higher for four hours and was 60 or above for two hours, the maximum velocity, 86 mis./hr., was 20 miles in excess of the highest velocity, 66 miles, previously recorded at New Orleans. The wind attained the greatest velocity when it shifted from east to southeast. • The wind subsided rapidly after
3	a. m. September 30, and died out almost completely between 5 p. m. and 8 p. m. The wind backed to the west •it 8:45 a. m., and to the northwest at 1 p. m., September 30. The wind, when at its height, wa.3 net steady but