New station added to data stream

The maximum number of stations changed from 14 to 15 on 10/1/97. The new 
station is Winnfield, AR (31.90, 92.78). The ingest was changed to
accommodate the extra station.

• ebeam_el_stn
• site_num_stn
• vbeam_el_stn
• wspd
• rh
• nbeam_az_stn
• temp
• press
• alt_stn
• anem_ind
• alt
• time_offset
• orient_n_stn
• rain
• checkout_mode
• nbeam_el_stn
• ebeam_az_stn
• lon
• dp
• vbeam_az_stn
• wdir
• avg_count
• lat
• lon_stn
• base_time
• lat_stn
• magnetic_dcn_stn