(if located higher than 100 hPa), and maximum wind data (if located higher than 100 hPa). If the upper-air sounding terminated below the 100- hPa level. Part C of the message may be encoded and transmitted  including  only  the  appropriate identification data followed by the code 51515 and the reason for termination code. PART D - UPPER SIGNIFICANT LEVELS Part D is used to report significant temperature and humidity  levels,  significant  wind  levels,  and  regional codes in the same manner as reported in Part B. Section 7,  for  sea-water  temperature  and  the  rawinsonde  system information. and section 8. for cloud information, are never included in Part D. Coded regional information, such as the 101 -groups. arc included as appropriate for any levels above 100 hPa. EARLY  TRANSMISSION MESSAGES Early  Transmission  messages  are  brief  reports  of certain observed upper-air data. which are sent as soon as possible after the radiosonde measures the 500-hPa level. Normally, these messages are manually encoded by all ships and designated synoptic land stations while the MRS continues to receive and process data. These messages  contain  only  the  appropriate  Part  B identification  data,  followed  by,  the  code  groups  51515 10196 and data for the 850-, 700-. and 500-hPa levels (as normally transmitted in Part A). Land stations may also  include  the  stability)  index  and  the  low-level  mean winds. The 10196 group identifies the data as an "early report.” In addition to encoding Parts A through D of the TEMP code, certain stations must encode some data in the  PILOT  code,  which  is  discussed  in  the  following text. Q60. Q61. Q62. How  should  the  following  data  "31313  46105 82325 90173" be decoded? In what part of a TEMP coded message would you expect to find data for the 70-hPa level? Early   Transmission   messages   report information up to what level? PILOT CODE LEARNING  OBJECTIVES:  Identify  the  three forms of the PILOT code and explain the use of each  form.  Identify  the  type  of  information contained  in  each  message  part  and  the meaning of each coded element. Describe the special use of the PILOT code for Rawinsonde observations  conducted  within  WMO  Region IV. The PILOT code is primarily used throughout the world  to  report  PIBAL-observed  wind  directions  and speeds.  In  the  United  States,  it  is  also  used  to  report fixed  regional  level  winds  observed  during  a Rawinsonde observation. Like  the  TEMP  code,  the  PILOT  code  is  also separated  into  four  parts  to  ease  handling  and  speed transmission. Parts A and C include winds observed at the  standard  altitudes  for  the  mandatory  pressure  levels. Parts B and D include winds for the significant wind levels. Parts A and B are for levels from the surface to 100-hPa (about 53,000 feet), while Parts C and Dare for levels  above  the  standard  100-hPa  level.  Each  part begins with an identification Data section. REVIEW   QUESTIONS Q56. What  Information  is  contained  in  Part  B  of  a TEMP coded message? Q57.   What  information  is  contained  in  section  8  in Part B of a TEMP coded message? Q 5 8 .  The 21212 indicator group is followed by what type  of  information? Q59.   How are boundaries of missing data encoded in Part   B? There are three forms of the PILOT code prescribed for use by the WMO. WMO code FM 32-1X PILOT is used  by  designated  shore  stations  to  report  upper-air observations of wind information. The code identifiers PPAA,  PPBB,  PPCC,  and  PPDD  are  used  to  identify this code form. FM 34-1X PILOT MOBIL is used by mobile  sites  ashore  to  report  atmospheric  wind observations.  The  code  identifiers  EEAA.  EEBB, EECC, and EEDD are used to identify thiscode. At sea. shipboard   upper-wind   observations   are   reported   in WMO  code  FM  33-1X  PILOT  SHIP  using  the identifiers  QQAA,  QQBB,  QQCC,  and  QQDD.  Each code form is nearly identical in format except for the identification information contained in the first line of each message part. 1-29