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11.1 General Functions and Subroutines NCLOCK, ICLOCK, HHMMSS, DATEJ are time and date conversion conveniences. SIND, COSD, and TAND are trigonometric functions using inputs in degrees (0) rather than radians. BEAMHT(R,E,A) calculates the height of the center of the radar beam at input radius R (km), elevation angleE (degrees), and antenna altitude A (km). The formula uses a 4/3 earth radius relationship. Setting A=O, gives radar beam height above the radar antenna. The following is a "tree" showing, by indentations, which program units call the others. GETRADAR is called by three program units, twice by the main program; the data that are subsequently used are different with each call. The above program units in the "tree" are omitted. Program units with names starting with "A31" are equivalents to PPS and VAD routines of the same names. The specific differences in each unit between this Snow Algorithm and those provided by the OSF are listed in appendix J. ~ PROGRAM RADAR7 A3133D A3133F GETRADAR GETPROF GETRADAR A317G2 A317H2 A317I2 A317J2 A317K2 GETRADAR GETARI GETRADAR OCCULT NOSPIKES PRECIP ADVECT FILENAME ! The main program that calls the other units ! _INIT_ADAPT loads the adaptable parameters ! _FILL_PRECIP _TABLE biased dBZ to mmIh * 100 ! The unpacker of Level II data: header ! Calculates the vertical wind profile to 15k ft ! The unpacker of Level II data: (dBZ and velocity) ! _VAD_PROC ! _VAD_LSF ! _VAD_RMS ! _FIT_TEST ! _SYM_CHK ! The unpacker of Level II data: header ! Loads azimuth-range arrays ! The unpacker of Level II data: dBZ (and velocity) ! Performs occultation adjustment ! Cleans reflectivities of isolateds and outliers ! Integrates snowfall rates for both falling styles ! Calculates volume scan bins for advected snow ! Increments input file name 11.2 Program Unit Description for the Snow Algorithm GETRADAR: The IRADIAIllist has indices such that an index of 0 indicates a location centered at the range of the radar antenna itself. The subroutine loads all data for each radial into two named commons whether they are ever used or not. The ICLOCK/list has all of the dates and times in "yymmdd" and "hhmmss" format. The VAL array has floating point numbers and the NUM has integer numbers for what might be considered housekeeping numbers: V AL(2), the center azimuth angle; V AL(3), the center elevation angle; NUM(7), the radial status; and NUM(8), the RDA elevation number, are used extensively by the rest of the Snow Algorithm. The other arrays present the reflectivities, velocities, and spectrum widths in 41