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EPTEMBER, 1909.
MONTHLY WEATHER REVIEW.
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SPECIAL REPORT ON THE HURRICANE OF SEPTEMBER 20-2 1909, ON THE LOUISIANA AND MISSISSIPPI COASTS.
The hurricane which moved northward over Louisiana an Mississippi, September 20-21, 1909, was of the greatest gei graphic extent and probably the most severe storm that hi been experienced on the central Gulf coast.
WEATHER CONDITIONS AT NEW ORLEANS PRECEDING AN DURING THE HURRICANE.
September 18.—The pressure was quite uniform, ranging froi 29.91 to 29.97 inches. The wind was light with the prevailir direction northeast until 5 p. m., and east, except for a sho intervals, from that hour until" midnight. The temperatu averaged 4° above the normal and ranged from 76° to 88°. T1 day was partly cloudy with cirrus and cirro-stratus cIou< moving from east or northeast during the greater part of tl day, but occasionally from the north. Polar bands tinged wit pink were observed at 7 p. m.
September 19.—Very little changc in pressure conditions toe place until the afternoon when the barometer began fallir slowly; at 10 p. m. a more rapid fall set in. The temperatui averaged 3° above the normal and ranged from 77° to 85°. Tl wind was steady from the northeast during the twenty-foi hours, the velocity increased steadily from a light wind in tl morning until noon, after which it blew generally at a rate i 18 to 20 miles per hour, the maximum velocity being at the rai of 28 miles per hour from the northeast at 12.55 p. m. Cirri stratus clouds prevailed .during the forenoon with some cumuli and alto-stratus during the afternoon. Rain fell at interva commencing at 4:55 p. in. About sunset the clouds were tinge with a brilliant carmine glow lasting from 5:50 to 6:30 p. m being most pronounced at 6:10 p. m.
September 20.—The barometer fell at a steady and unifori rate from 29,80 at midnight of the 19th to 29'.63 at 10 a. m after which the decrease in pressure was more pronounced an was at a uniform rate of nearly one-tenth of an inch in tw hours until 7 p. m. when the lowest reading, 29.23 inches, wf recorded. The lowest temperature during the day, 74°, occurre at 1 p. m.. and the highest recorded during the twenty-foi hours was 79°. The wind was from the northeast until 8 a. m coming in sudden gusts ranging in velocity from 22 to 42 mih per hour, a rate of more than 30 miles per hour being recorde in some five-minute period of every hour after 1 a. m. From to 9 a. m., the wind blew from all directions, not continuous! from anyone direction during a period of five minutes: durin this hour the wind lulled and the velocity was uniformly aboi 16 miles per hour. From-9 to 10 a. m., the wind blew steadil from the northeast and the velocity nearly doubled over tha of the preceding hour with a maximum at the rate of 40 mile per hour at 9:53 a. m. From 10 a. m. until noon the wind ws variable blowing from all directions not remaining from an one direction during a period of more than five minutes. Th wind lulled again during this time and the velocity ranged froi 12 to 24 miles per hour. From 12 noon until 3 p. m. the win oscillated between northeast and southeast, being mostly eas and the hourly wind velocity ranged from 25 to 33 miles pe hour, the maximum for five minute periods being for each hoi; at the rale of 31. 37. and 40 miles, respectively. From 3 to p. in., the wind was mostly (tom the east, but occasionally froi