. The climate and weather of Baltimore . Fig. 153.—The Thunderstorm of July 20, 1902. remaining at this velocity until p. m. In the next five minutes thevelocity suddenly increased to 46 miles, and at p. m. it blew at theexcessive rate of 75 miles per hour from the west. Coincident witli thesudden increase in the wind velocity the pressure rose nearly a tenth ofan inch in the course of a few minutes, while the temperature fell asrapidly from 94° to 69° and the rain fell in torrents for a few wind rapidly fell and by 2 p. m. had regained its early morningvelocity of 5 to 6
. The climate and weather of Baltimore . Fig. 153.—The Thunderstorm of July 20, 1902. remaining at this velocity until p. m. In the next five minutes thevelocity suddenly increased to 46 miles, and at p. m. it blew at theexcessive rate of 75 miles per hour from the west. Coincident witli thesudden increase in the wind velocity the pressure rose nearly a tenth ofan inch in the course of a few minutes, while the temperature fell asrapidly from 94° to 69° and the rain fell in torrents for a few wind rapidly fell and by 2 p. m. had regained its early morningvelocity of 5 to 6 miles per hour. The pressure regained in half an MARYLAND WEATHER SERVICE 441 hour the height at which it stood before the sudden rise, and thencontinued to fall slowly until about 8 p. m. The temperature roserapidly after the sudden fall, recording 84° at p. m., maintaining M DT. 6 A. NOON 6 P. Fig. 154.—The Thunderstorm of July 20, 1902. this reading approximately until 6 p. ni., when it fell rapidly to 76°shortly after 8 p. m. An hour or so before the sudden fluctuations in wind velocity, tem-perature, and pressure recorded above, the wind veered from southwest to 442 THE CLIMATE OF BALTmORE
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