• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
REMARKS AND ADDITIVE DATA
SHIPBOARD SURFACE AVIATION WEATHERSHIP AVIATION CODE

Aerographers Mate, Module 01-Surface Weather Observations
Page Navigation
  117    118    119    120    121  122  123    124    125    126    127  
All remarks and additive data groups used in an METAR coded observation must be indicated by the abbreviation "RMK" and should be in the order listed in table 3-3. Some general comments on certain remarks appear  below. SEA   LEVEL   PRESSURE   (SLPppp).  This remark  is  MANDATORY.  Sea  level  pressure  is encoded as SLPppp where SLP is the remark identifier and ppp is the sea-level pressure coded by using the tens,  units,  and  tenths  digits  in  hectopascals.  For example,  a  sea  level  pressure  of  998.2  hectopascals would be encoded as "SLP982." If sea level pressure is not  available,  it  is  coded  as  "SLPNO." AIRCRAFT MISHAP (ACFT MSHP). If a report is taken to document weather conditions when notified of an aircraft mishap, the remark ACFT MSHP will be included on the observation form but will not be transmitted. Table 3-4.—Additive Data Groups Additive Data (RMK) Element METAR  SPECI Hourly Precipitation X Amount 3- and 6-hourly Precipitation X Amount 24-hour Precipitation X Amount Snow Depth on the Ground, X 4/sss Water Equivalent of Snow on X the ground, 933RRR Cloud Types 8/CLCMCH X Hourly Temperature and X Dew Point 6-Hourly Maximum X Temperature 6-Hourly Minimum X Temperature 24-Hour   Maximum   and X Minimum  Temperature 3-Hour Pressure Tendency X 5appp X indicates element included at all stations FIRST and LAST (FIRST and LAST). At part- time stations, the first and last reports transmitted will be  identified  by  including  the  word  "FIRST"  in  the report of the day after a break in observing coverage and/or the word "LAST" in the last report of the day before a break in observation coverage. Additive Data Groups Additive  data  consists  of  supplementary precipitation,   temperature,   cloud,   and   pressure information reported hourly, every 3 hours or every 6 hours.  At  0300Z,  0900Z,  1500Z,  and  2100Z,  the  3- hourly additive data is included in observation reports. At  0000Z,  0600Z,  1200Z,  and  1800Z,  the  6-hourly additive data is included in the observation reports. The 3-hourly additive data consists of the 3-hour pressure  tendency,  cloud  type  information,  and precipitation data reported in the symbolic format shown in table 3-4. The 6-hourly additive data shown in this  table  is  identical  except  it  contains  6-hour precipitation  data. 3-10 Other supplementary information consists of snow depth,  maximum  or  minimum  temperature,  and  24-hour precipitation.  The  snow  depth  group  is  reported  (in inches) only if there is snow or frozen precipitation on the ground. It is normally reported in the OOOOZ and 1200Z  observations,  and  at  subsequent  6-hourly observations  (18002,  OOOOZ,  06002)  if  measurable precipitation has occurred during those periods. The maximum  and  minimum  temperatures  during  the  past  6 hours are reported at 0000Z, 0600Z, 1200Z, and 1800Z, while maximum and minimum temperatures during the past 24 hours are reported at 0600Z. The 24-hour precipitation (liquid equivalent) is reported only at 1200Z. If a station is closed down for a weekend or holiday, the 24-hour precipitation should also be used to report total precipitation since the last reported 24-hour precipitation  In  this  case,  the  24-hour precipitation  may actually be used to report a 72-hour total precipitation. Runway Conditions Runway surface condition (RSC) and average runway condition reading (RCR) are included in a METAR coded report when runway conditions produce less than normal braking for landing aircraft. Different codes may be combined to describe conditions. Each condition should be followed by a decelerometer reading (RCR) from 02, poor braking action, to 25, excellent braking action. Codes used for RSC include "WR" for wet runway, "SLR" for slush on runway,







Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.