. The climate and weather of Baltimore . ed 11 times on July 5, in the same period, makingthe maximum probability 41 per cent of the total number of such daysin 29 years. Consecutive Days vfiTu Thundeestorms. Thunderstorms generally occur as isolated storms in the vicinity ofBaltimore. In over 80 per cent of all instances, a second storm doesnot occur on the following day. In only 14 per cent of all cases havethere been thunderstorms recorded on two successive days, and in onlya little over three per cent have storms occurred on three successivedays. Only on one occasion have as many as 5 occu
. The climate and weather of Baltimore . ed 11 times on July 5, in the same period, makingthe maximum probability 41 per cent of the total number of such daysin 29 years. Consecutive Days vfiTu Thundeestorms. Thunderstorms generally occur as isolated storms in the vicinity ofBaltimore. In over 80 per cent of all instances, a second storm doesnot occur on the following day. In only 14 per cent of all cases havethere been thunderstorms recorded on two successive days, and in onlya little over three per cent have storms occurred on three successivedays. Only on one occasion have as many as 5 occurred on 5 successivedays. These percentages vary in different montlis Init they are not MARYLAND WEATHER SERVICE 281 large in any month. The following table shows the figures for eachmonth and for the year: CONSECUTIVE DAYS WITH THUNDERSTORMS.(Total number in 28 years.) aa>-> 4= p. -> 3 o 3 11 16 i 3620 65132 87 18 4 1 1 94 21 6 3 6713 4 2661 7 6 2 410 73 17 4 1 On 3 consecutive days 3 4 5. s. 80.—The Direction of Movement of Thunderstorms. The diagram shows the actual and relative frequency of thunderstorms from eachdirection of the compass. The total number of storms represented is nearly 400. Direction of Thunderstorms. In the vicinity of Baltimore, thunderstorms usually come into viewfrom some point between northwest and southwest. Out of a total of 282 THE CLIMATE OF BALTIMORE about 400 storms, nearly 90 per cent moved from some one of tliesepoints. (See Fig. 80.) The order of frequency of direction is asfollows: THUNDERSTORM DIRECTIONS.(1876-1902.) Jan. Feb. Mar. Apr. 8 31 May 26 19 12 2 2 2 June July Aug. Sept. Oct. Nov. Dec. Year NW to SE 1 i 3 4 i 202931 312 5 33 32 20 2 6 52 21 18 21 3 2 2 2 186 7 ii 1 i .. 2 1 .. 126 W E 115 SW NE. S • N 2 1 104 8 SE NVV E W \ E S W 1 144 N S 13 Pressure Changes During thunderstorm usually occurs with a falling barometer; the bar-ometer rises during the first few minutes after the storm has beg
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