. The climate and weather of Baltimore . but there wasconsiderable sunshine from 7 a. m. until 1 p. m., when a sheet of stratusclouds appeared in the west, intensely dark and advancing rapidlytowards the zenith. At p. m. small torn cumulus clouds passedrapidly southwest to northeast in advance of the cloud of dust. Thiswas followed by a stratus layer which by p. m. covered the entiresky. At p. m. the stratus clouds, moving southwest to northeast,began to break away. Between the open spaces strato-cumulus cloudswere visible above moving from west to east. (See Fig. 154.) 29 440 T
. The climate and weather of Baltimore . but there wasconsiderable sunshine from 7 a. m. until 1 p. m., when a sheet of stratusclouds appeared in the west, intensely dark and advancing rapidlytowards the zenith. At p. m. small torn cumulus clouds passedrapidly southwest to northeast in advance of the cloud of dust. Thiswas followed by a stratus layer which by p. m. covered the entiresky. At p. m. the stratus clouds, moving southwest to northeast,began to break away. Between the open spaces strato-cumulus cloudswere visible above moving from west to east. (See Fig. 154.) 29 440 THE CLIMATE OF BALTIMORE The first peals of thunder were heard at p. m., coming from thesouthwest. The electrical display was brilliant during the height of thestorm. The last thunder was heard at p. m. Light rain began p, m., changing to a heavy shower at p. m.; the rain moved indense sheets from southwest to northeast. In the meantime the windwas increasing in velocity; at 1 p. m. it registered 17 miles per hour,. 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. MDT.
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