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September, 1915.	MONTHLY	WEATHER	REVIEW.	46
Reserve, La.—During the recent hurricane the wind shifted from northeast to east, predominating from the northeast. The storm started here about 10 a. m., and blew steadily from the northeast until about 6 p. m., then from that hour it shifted from northeast to east until about midnight; after midnight it turned to the west for quite a time. During the storm there was no period of calm, but the wind blew in. gusts most of the time.— Edward Godchaux.
St. Gabriel, La.—The wind began from the northeast about 7 a. m. of the 29th, and gradually increased until 9:30 p. in., when it shifted to the northwest and subsided.—Capt. John B. Murphy.
Don a IdsonvxUe, La.—The direction of the wind in the hurricane of September 29 was northeast from the time of observation at 7 a. m. until 5:30 p. m., when there was a period of calm, after which the wind shifted to north, keeping that direction until 8:45 p. m., when it backed to northwest.—Alfred J. Landry.
Cinchre, La.—The wind on September 29 was from the northeast until about 5 p. m., when it shifted to the north and remained from that direction until it subsided. The wind was high from neon until 11 p. m. There was no noticeable period of calm.—*4. W. Wallace.
Covington, La.—High east wind began on the morning of the 2Sth; about 6 p. m. the wind increased in velocity and commenced from a southeasterly direction. The velocity increased from 7 p. m. until 10 p. m., when it blew hardest. After the wind shifted to southeast there were lulls of a short duration, then the wind would blew with greater fury than ever — Mrs. 2L Q. Buquoi.
Bcion Rouge, La.—On the morning of September 29 there was a light northeast wind, which increased in velocity as the day passed, and between 5 p. m. and 6 p. m. ft shifted to northwest, and about 7;30 p, m. the wind was highest.—Elmo M. 3ott.
Hammond, La.—The wind started in blowing from the northeast in the morning and gradually increased in velocity as night approached. About 5 p. rc. it lulled slightly, but then began to blow harder until about 7 p. m., when it came out of the north, and about this time the storm seemed to reach its maximum.—O. C. Carr.
Amite, La.—The winds came alternately high and light from the same direction, northeast. There were high winds from the northwest also.— Miss Lviv, M. V/ente.
SPECIAL FEATURES SECWK BY TEE WINES.
An interesting feature brought out by the foregoing reprirts on the winds in this hurricane’ is that in the eastern or right-hand segment of the hurricane the highest velocities are invariably reported to have occurred with the change from easterly to southeasterly winds, being as a rule from the southeast, and probably coincident with the passage of the hurricane center. The •ecords at New Orleans find Burrwood show this positively. In the western or left-hand segment, the highest velocities are reported to have occurred at some pnint between north and northwest, and with a change of the winds towards the west. The highest winds in the right hand segment, came from the opposite quadrant from that in which they occurred in the left hand segment, being almost from directly opposite directions.
At New Orleans with the change in direction from southeast to south the wind velocity fell off to 50 per cent of what it had been with the same barometric gradient when the direction was from the northeast to southeast. A similar decrease in velocity is reported to have
hurricane when the wind shifted from northwest to wes and southwest. The progressive movement of the hurri cane being about 12 miles per hour (see path and move ment o: hurricane center) accounts for part of this, viz The progressive movement would increase the gradien wind 3.7-12 miles per hour in the front segment, an< diminish the gradient wind by the same amount in th rear segment, which together would ^ive an apparen difference in velocity, making it 24 mites greater in th front segment than in the rear segment ot the cycloni area. This leaves a falling off in the wind velocity in th rear segment below that in the front segment when com pared to barometric gradients of something like 10 mile per hour, which is not - explained by the prcgressiv velocity of the cyclonic area.
PRECIPITATION.
Light precipitation began at 2:35 a. m., on the 29tl and with the exception of a heavy shower for a few mit utes about 3:40 a. m., soon after the wind veered fror northeast to east, very little precipitation occurred pric to 7 a. m., during which time the wind was from the eas Soon after 7 a. m., the wind backed to the northeast an the precipitation increased until 12 noon, 1.59 inehe being recorded in the hour ended at 12 noon. The pr« cipitation became lighter again after the wind veered t the east at 1:10 p. m,, and it diminished until the fa during the hour ending at 3 p. m,, was only 0.30 in cl As the wind veered toward the southeast the precipite tion became heavier again and during the hour ended s 5 p. in., also the hour in which the complete change froi east to southeast occurred, the precipitation amour.te to 1.05 inches. The precipitation then diminished an almost ceased about half an hour before the wind veere from southeast to south at 6:35 p. xn., or rather it cease during the hour in which the change to south was takin place. A Light misting rain, however, continued tint 11:30 p. m, The total precipitation during the passas of the hurricane amounted to S.20 inches. A notabl feature in connection with the precipitation was th increase In precipitation just prior to the time that th wind snifted from northeast to*east near the middle of th day, tne falling off in the amount of precipitation bot during the early morning hours and again in the afternoo hours’during the time the wind was from the east, th increase in the amount of precipitation again as the win was shifting from the east to southeast, and that th precipitation almost ceased when the wind veered froi southeast to south.
The distribution cf the precipitation in the area coverc by the cyclonic movement of tne atmosphere is of specis interest. The heaviest precipitation occurred near th center and within a distance of 25 miles to the east of th center, but heavy precipitation occurred over a larg area in the eastern segment of the storm, while to the wes of the rath of the center of the storm the prccipitatio: diminished rapidly and 50 miles to the west ot the pat of the center of the storm the precipitation was negligible The distribution of nrecipitation in relation to the cente of the hurricane is shown in figure 7 i.XLiir-114).
LIGHTNING ANI> THUNDER.
The flashes of lightning, supposed to be a special fes ture in a tropical hurricane, were not present in this on< There was an absence of lightning and thunder, whic cans for snecial comment. About 3 a. m. of Sentembc