298 Tornado in N. E. part of Ohio, Feb. A, 1842. 
TORNADOES IN THE 
Date, Hour. Temp. Attendant phenomena. Course} 
“hac Miss., 1823 May 
gan, Ohio, 1823 June 19/9 1-2. m./unusual heat lightn’g|rain East : 
Natchez, Miss., 1824 May 
Maury Co., Tenn., |1830 Mar. ee 
dc Tenn., ; ar Bi }midnight sultry lightn’g ages are pe East ' 
ingston, Mis: by Be 
Peringteli. Ohio, 1833 Apnit ni ee j 
N. ©, 33 Oct. 12! 
Utic 1834 ace 14/4-5 P.M. hot lightn’g'rain and hail East | 
Kinderhook’ N. Y.,/1835 June 19/4 P. m. 84° lightn’g rain N. E. 
N. Brunswick, N i 1835 June 19/5 1-2 p. um. 82 htn’ Leta and hail ln.80°R.) 
lightn’g, ; 
Pine Plains, N. Y., |1837 June 3/6 p. m. sultry lightn’g rain East 
Stow, Ohio, 1837 Oct. 20/3 a.m. |75°2p.m. onl9th lightn’g!rain East 
Mast, N. ¥., —|1838 July 25/p. m. ° lig tn’g| ees 
arerideuss, RL, |1838 ine. Fo P. M, lightn’g rain 4 8. E. 
Maumee, Ohio, 1839 M lightn’g rain 
a sawed: Ct., 1839 bel re noon 76° lightn’g rain and hail 
Mobile, Ala., 1840 Mar. 24/7 p. mu. sultry lightn’g'rain and hail 1 inch |s- 
, I. . ,,| § rain8 2-3in.: very 2 |. 
Natchez, Miss., |1840May 7/2. m. 80°" flightn’g| } Trge hallstones 
May field, Ohio, 1842 Feb. 441-22. um. 60 lightn’g rain and hail 
‘Tuscaloosa, Ala., |1842Mar. 416 a.m. {| copious rain 
oe 
From the preceding table it may be inferred, 1. That no sea 
son of the year is exempt from tornadoes, but that they occur by 
most frequently in May and June. 2. That they occur chiefly , 
between noon and sunset. Only three out of fourteen occu 
during the night; and 3. That the temperature at the time is. 
unusually elevated. This is a generalization of co Am 
that tornadoes are to be expected only at hig smpera- 
tures, aaa if they occur in cold months, the temperature. is unt 
sually high for the season. 4. They ate invariably accom 
by lightning and rain, and frequently by hail. 5. Their progress | 
in this country is invariably eastwardly, the mean being about ; 
twelve degrees north of east. 6, Their average breadth is about. | 
one hundred and twenty rods; length fifteen miles ; velocity of 
progress when violent about thirty miles per hour ; duration of de- 
structive violence forty five seconds. The haseiicls of destructive . 
violence may be computed from the breadth and velocity © the 
tornado, on the supposition that its base is circulars, and | 
result is more to be depended upon than the estimates of ob- 
servers, which are generally made under the influence of fear and 
likely to be exaggerated. 7. Light objects are frequently trans: _ 
ported by the the wind a distance of from three to twenty miles. 
8, Very few human lives are lost by tornadoes. With the exceP” 
tion of the Natchez tornado, the average is but about one toa tor 
