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TERMS
GRAPHIC  HISTORY

Aerographers Mate, Module 01-Surface Weather Observations
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from the National Weather Service. Products produced by processing data fields received from FNMOC must have a legend line (or lines) added across the bottom or top   of   the   graphic   identifying   the   information displayed. The legend line identifies the product using standard  abbreviations  and  the  valid  time.  For  example, an analysis of the surface pressure data field of the 1800Z  12  December  1996  observation  data  may  be identified  with  a  legend  line  SFC  PRESSURE ANALYSIS VALID 08DEC96 1800Z. The  valid  time  is  the  UTC  date/time  that  is represented by the information on the graphic. On some products,  the  valid  time  is  identified  with  the designation VT: or the word valid; on other products, the date and time are just listed. In the case of an TERM SYMBOL COLOR Cold front at the surface BLUE Cold front aloft BLUE Cold front frontogenesis BLUE Cold front frontolysis BLUE Warm front at the surface RED Warm front aloft RED Warm  front  frontogenesis RED Warm  front  frontolysis RED Occluded front at the surface PURPLE Occluded front aloft PURPLE Stationary front at the surface RED AND BLUE Stationary front aloft RED AND BLUE Stationary  front  frontolysis RED AND BLUE Instability / Squall line PURPLE Trough axis BLACK Ridge axis BROWN Shear line BLUE Inter-tropical  Convergence  Zone RED Tropical Wave BLACK Jetstream  core RED High  Pressure/height  center BLUE Low  pressure/height  center RED Tropical  Depression  center RED Tropical Storm center RED Hurricane / Typhoon center RED Figure 4-12.—Symbols used on surface pressure and constant-pressure level analysis and prognosis charts. 4-14







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