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| | | | | | |
| Order.|Vortex.| Date. | Meridian |Passage.| Calculated latitude |
| | | | Passage. | | and Remarks. |
|_______|_______|_________|__________|________|______________________|
| | | | | | |
| 1st | I. A. | June 22 | 7 A.M. | south | Centre. About 40d. |
| | | 23 | 8 A.M. | north | Warsaw. Storm. |
| 2d | O. D. | 27 | 0 noon | north | |
| | | 28 | 1 A.M. | south | See record. |
| 3d | C. A. | July 1 | 9 A.M. | south | |
| | | 2 | 10 A.M. | north | Lat. 43d. Storm. |
| 4th | I. D. | 7 | 5 P.M. | north | |
| | | 8 | 6 P.M. | south | Lat. New York. Storm.|
| 5th | C. D. | 12 | 5 P.M. | north | Aurora. |
| | | 13 | 6 P.M. | south | Stormy, very. |
| 6th | O. A. | 14 | 10 A.M. | south | |
| | | 15 | 11 A.M. | north | See Record. |
|_______|_______|_________|__________|________|______________________|
The intervals between the ascending and descending passages of the
different vortices, are
Between I. A. and I. D. from 11 to 14 days.
" O. A. " O. D. " 10 " 12 "
" C. A. " C. D. " 9 " 11 "
and the effect is greatest when the vortex comes to the meridian before
the sun, and least when after the sun; in which case the full effect is
not developed, sometimes until the following day.
A brief abstract from a journal of the weather for one sidereal period
of the moon, in 1853.
_June_ 21st. Fine clear morning (S. fresh)[15]: noon very warm 88d;
4 P.M. plumous _cirri in south_; ends clear.
22d. Hazy morning (S. very fresh) arch of cirrus in west; 2 P.M., black
in W.-N.-W.; 3 P.M., overcast and rainy; 4 P.M., a heavy gust from
south; 4.30 P.M., blowing furiously (S. by W.); 5 P.M., tremendous
squall, uprooting trees and scattering chimneys; 6 P.M., more moderate
(W.)
23d. Clearing up (N.-W.); 8 A.M., quite clear; 11 A.M., bands of mottled
cirri pointing N.-E. and S.-W.; ends cold (W. N.-W.); the cirri seem to
rotate from left to right, or with the sun.