The processes which resultcd i i i the filling of a tropical cyclone over land h a w been iiivcstigated. Thc eddy fluscs of latciit and sciisible heat and the dissipation of kinetic energy a t the earth's surface have been computed for a 3-day period. 0 1 1 the first two days thc cyclone was over thc occaii and on the third day it was over land. Hciice it was possible to compare thc rates of ciicrgy exchange a t the surface after thc charactcr of the lowcr boundary had changed. Somc significant diffcrciices in these rates of cschaiigc wcrc detected.
Hourly rainfall amounts from 16 hurricanes are plotted relative to the center of the storm to obtain the mean areal rainfall rates around the storm. The rates ahead of the center are greater than those to the rear, but the differences in rates between the right and left sides are not large. The frequency distributions of various hourly amounts are tabulated for stations within about 100 miles of the center. Finally, the latent heat of condensation is calculated from the mean areal rainfall data. This is found to be about 6 x 1028 ergs per day.
Equations for the prediction of hurricane tracks have been developed by use of statistical methods. Data at sea level, 700 mb., and 500 mb. were selected as predictors. Forecasts are prepared in 12-hr. steps for periods up to 48 hr. The forecast equations have been tested on an operational basis during the 1964 and 1965 hurricane seasons. The accuracy of these forecasts compares favorably with that of other standard hurricane forecast techniques .
The NHC-64 statistical equations for predicting the movement of hurricanes have been in operational use for 4 yr. These equations have continued to perform well. Following the 1966 hurricane season, however, it was apparent that the equations could be improved. A new forecast technique, based on additional data and additional predictors, has been derived. Tests on independent data for 1966 and on an operational basis during 1967 indicate that the 1967 method is slightly superior t o NHC-64.
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