Open AccessAn objective method of prognosticating the five-day mean 700-mb chart two to four days ahead
Author(s) -
P. S. PANT,
Sunit Das,
T. R. NATARAJAN
Publication year - 1965
Publication title -
mausam
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.243
H-Index - 12
ISSN - 0252-9416
DOI - 10.54302/mausam.v16i3.5648
Subject(s) - chart , anomaly (physics) , mathematics , statistics , linear regression , geodesy , geology , physics , condensed matter physics
A few grid points representing different portions of the area covered by the latitudes 35°N and 5"N and longitudes 65°E and 95°E were chosen, For each selected grid point prognostic equations based on linear regression were obtained for predicting the mean 700.mb cloud contour anomaly for a pentad from the corresponding contour anomaly for the first and middle days of the same pentad, Data for the 5-year period 1957-61 were utilised for obtaining the regression equations for July and data for the period 1958.62 for obtaining corresponding equations for January.
The above prognostic equations were applied to a few situations in January 1963 and July 1962, in order to obtain the prognostic 5-day mean 700-mb charts two to four days ahead. The prognostic charts so obtained were compared with the actual charts and good agreement was noticed between them.