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for the months of July, August, September, and October 1957.
Daily
100-mb and 50-mb charts for the months of July, 1957 to November, 1957,
inclusive, have been plotted with approximately 80% of all the data
which eventually will become available.
Graphical aids such as solar
radiation correction curves, anticyclonic instability shear criteria,
and geostrophic wind scales have been prepared to aid in the analysis of
charts.
Preliminary analyses for portions of 100-mb charts for the months of
July, August, and September 1957 have been sketched.
A study is being
made to determine whether the thickness technique can be utilized in the
analysis of 50-mb charts.
Two short series of 100-mb charts over the
Eurasian area for several days in July, 1957 and January, 1958 were
prepared upon special request.
Another short series of four hemispheric
100-mb charts for the period of November 16-19th, 1957, inclusive, were
plotted and analyzed for use in connection with an experiment in numerical
computer analysis of 100-mb charts, currently being undertaken in
cooperation with the JNWP Unit at Suitland.
The Navy Weather Research Facility supported a pilot study in
coordination with this Project, Pennsylvania State University, and NWRC
at Asheville to develop regression equations suitable for the extrapolation
of data to the 100-,
50-, and 30-mb levels.
The results of this pilot
project were recently evaluated, and the full-scale development of suitable
regression equations is now in process at Asheville.
The equations will
eliminate several months of work in developing scattergrams for the re-
maining months of the year.