Table Al 

 Keynotes on Meterological Observations 



1. Wind Field Gustiness (WFG) : A plus symbol (+) is entered if the wind 

 speed varies by more than 5 m/sec. 



2. Variation (VAR) : The peak value of the wind speed is entered under VAR 

 when the peak value exceeds the value of the wind speed by at least 5 m/sec. 



3. Weather conditions: 



WS Water spout 



TH Thunderstorm 



FD Freezing drizzle 



F Fog 



SS Snow shower 



RS Rain shower 



H Hail 



S Snow 



R Rain 



D Drizzle 



K Haze or smoke 



4. Intensity of weather conditions: 



(+) Unusually intense 

 (-) Mild conditions 



5. Pressure Trend: 



First number indicates characteristic of change 



= Increasing then decreasing 



1 = Increasing then steady, or increasing more slowly 



2 = Increasing either steady or unsteady 



3 = Decreasing or steady, then increasing; or increasing, then increasing 



more rapidly 



4 = Steady 



5 = Decreasing then increasing 



6 = Decreasing then steady or decreasing more slowly 



7 = Decreasing steady or unsteady 



8 = Steady or increasing then decreasing or decreasing then decreasing more 



slbwly 



Next two columns indicate code of the amount of change in last 3 hours; higher 

 numbers indicate more change, i.e. 



00 = 0.0 millibars 



51 = 5.1 millibars 

 100 = 10.0 millibars 

 200 = 20.0 millibars 



A2 



