PS

Sea level pressure, in millibars, but with only the last two digits transmitted. Since sea level pressure typically varies from 960 mb to 1050 mb, the missing numbers will be either a 9 or a 10, and it's always possible to figure out which. These pressure forecasts are particularly useful for pinning down the passage of a front, with the lowest pressure occurring at about the time of frontal passage. In the example below, there is a frontal passage between 12 and 18 hours (00Z to 06Z October 31), indicated by the pressure (falling, then rising), the winds, and the temperatures.

OUTPUT FROM ETA 12Z OCT 30 96

TT PTT R1 R2 R3 VVV LI PSDDFF HH T1 T3 T5

BOS //60 58 60 007 19 131410 56 05 05 04

06 000 81 84 48 042 09 091622 56 08 06 05

12 008 93 51 14 008 02 002126 59 12 12 10

18 000 77 30 14 -18 11 022828 55 12 08 04

24 000 74 35 20 -09 13 092924 49 09 04 00

30 000 64 33 39 -22 16 102818 48 08 03 00

36 000 62 47 49 033 18 112519 47 08 03 00

42 000 61 59 56 -03 18 112621 42 05 02 99

48 000 63 64 54 003 18 132618 40 03 00 97

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