IDENTIFICATION DATAThe identification data contains the data type, thelocation identifier and/or location, and the date-timegroup. The format is identical to the TEMP code, PartB: MiMiMjMj YYGGa4 IIiii is used with the PILOTcode, while PILOT SHIP and PILOT MOBIL useMiMiMjMj D....D YYGGa4 99LaLaLa QcLoLoLoLoMMMULaULo hOhOhOhOim. The same identificationdata format is used in all four parts of the report.PART A - LOWER MANDATORYLEVELSPart A of the message contains identification data;mandatory level winds. and the maximum wind andwind shear values.Mandatory Level WindsAfter the identification data. the first section of thePILOT code Part A is the winds at the mandatory levelsin the format 44nP1P1 or 55nP1P1 ddfff ddfff ddfff. The55nP1P1 group is used only when the altitudes of thepressure levels are based on standard altitudes abovemean sea level. The 44nP1P1 group is used when thealtitudes are obtained from pressure equipment. such asa radiosonde. This cluster of four five-digit groups,reporting winds at three mandatory levels, is repeatedfour times to include all the mandatory levels throughthe 100-hPa level.In the first group. the n indicates the number ofstandard levels reported in the section and the number ofddfff groups that follow. This figure is usually a 3, butmay be a 1 or 2 in the last repetition. The P1P1 is thehundreds and tens value of the first pressure levelreported.The ddfff group reports wind directions (dd) andwind speeds (fff). As in the TEMP code. the units ofwind speed are meters per second if the date, YY. in theidentification data is simply the UTC date. When thewind speed units are reported in knots, 50 is added to thedate. All wind directions in the PILOT code arereported to the nearest 5 degrees.For example. the coded groups 43300 09535 0805806601 indicate winds at three pressure levels (from aradiosonde). starting at the 1,000-hPa level ("00"). 095°at 35 knots: the 925-hPa level. 080° at 58 knots; and the850-hPa level. 065° at 101 knots.Maximum WindThe following five different formats are used for theindicator group of the level of maximum wind or asecondary level of maximum wind:66PmPmPm—maximum wind at top of sounding,measured pressure level reported.6Hm Hm Hm Hm —maximum wind at top ofsounding. standard altitude reported in meters.77PmPmPm—maximum wind within sounding.measured pressure level reported.7HmHmHmHm—maximum wind within sounding.standard altitude reported in meters.77999—no maximum wind observed.The PmPmPm is the measured pressure level inhectopascals and HmHmHmHm is the altitude indecameters (units rounded off. hundred-thousandsvalue not reported). A maximum wind level must havea wind speed in excess of 60 knots and occur above the500-hPa level. A secondary maximum wind level mayalso be reported.Following the maximum wind indicator group, thewind is reported in the format ddfff, and the optionalvertical wind-shear group, 4vbvbvava, may be reportedthe same as in the TEMP code.PART B - LOWER SIGNIFICANT LEVELSThis part of the PILOT code message containsidentification data, reports of winds at significantlevels, and regional and national coded information forthe levels up through 100 hPa. In WMO Region IV, thefixed regional levels (PPBB) replace any significantlevels (section 6, Part B of TEMP Code).Significant Level WindsWhen only significant levels are reported. asindicated by the identifier group 21212. each level isencoded in two five-digit groups in the format nnPPPddfff. The nn indicates the level (number 00 for surface,and then upward from 11 through 99, and repeating asnecessary. The PPP is the pressure for the level. Theddfff is the wind direction and speed, just as reported forthe mandatory levels.Fixed Regional Level WindsWhen this section is used to report winds at fixedregional levels, a slightly different format is used. The1-30
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business