MODIFICATION OF REPORT MESSAGE

MODIFICATION OF REPORT MESSAGE The MRS coded message is in the proper WMO International code but does not conform to the United States national coding practice with regard to significant level winds. By national coding practice, all fixed and mobile land upper-air stations within the United States do not report significant wind levels, but only include fixed regional level winds. In addition, fixed regional level winds are reported in the PILOT code in message Parts B and D. However, U.S. Navy ships, even though they may be operating within WMO Region IV, report significant winds levels only in Part B of the TEMP code. U.S. Naval ships may use Additional Data groups, the so-called "101-code groups" (table 1-6), as specified by WMO Region IV practice, even when operating outside the region. These codes must be used by all mobile and fixed land stations within North America, the eastern Pacific, and the Caribbean. These data groups are not encoded by the MRS, but must be manually entered. The 101-codes are used following the "51515" Regional Data Identifier group, as appropriate, in sections B and D of the TEMP codes. Designated Synoptic stations use many of these 101 codes to indicate why a report for a scheduled sounding is not available at the normal time. Most Navy and Marine Corps upper-air observers use the code groups to explain the reason for sounding termination, to indicate levels of doubtful data, and to report corrected data. The FMH-3 contains a complete list of all 101 code groups. We will discuss where and how these codes groups are used within the TEMP code later in this chapter. In addition to the 101 codes, most ships insert the balloon release height immediately after the Table 1-6.—Region IV Additional Data Groups 10154 Local radio interference AND UPPER LIMITS OF DATA 10155 Fading signal 10165 Altitude and temperature doubtful 10156 Weak signal 10166 Altitude doubtful 10158 Flight equipment failure (radiosonde, balloon, etc.) 10167 Temperature doubtful 10159 Any reason not listed above 10168 Dew-point depression doubtful 10187 Surface data 10188 Additional data DOUBTFUL DATA FOLLOWED BY ONE OR MORE OP_nP_nP_nP_n GROUPS, FOR LOWER 10150 Ascent did not reach 400 hPa level 10151 Balloon forced down by icing 10152 Balloon forced down by precipitation 10153 Atmospheric radio interference REASON FOR NO REPORT OR AN CORRECTED DATA FOLLOWS INCOMPLETE REPORT 10140 Report not filed 10178 Tropopause data 10141 Incomplete report; full report to follow 10179 Maximum wind 10142 Ground equipment failure 10180 Entire report (parts to follow A, B, C, and D) 10143 Observation delayed 10181 Parts A and B 10144 Power failure 10182 Parts C and D 10145 Unfavorable weather conditions 10183 Parts A and C 10146 Low maximum altitude (less than 1500 feet AGL) 10184 Parts B and D 10147 Leaking balloon 10185 Minor error in this report. correction follows 10149 Military operations preclude sounding 10186 Additional significant levels not in original report follow 1-16