HH

The thickness (in decameters) of the layer of air between 1000 mb and 500 mb. The leading 5 (or, more rarely, 4) is not transmitted. This parameter is used most frequently in snow forecasting, since the thickness of a layer of air between two pressure levels is proportional to its mean temperature. The critical thickness varies from place to place, but typically a thickness less than 534 implies snow while a thickness greater than 540 implies rain. That's assuming anything falls in the first place.

OUTPUT FROM ETA 12Z OCT 30 96

TT PTT R1 R2 R3 VVV LI PS DDFF HHT1 T3 T5

BOS //60 58 60 007 19 13 1410 5605 05 04

06 000 81 84 48 042 09 09 1622 5608 06 05

12 008 93 51 14 008 02 00 2126 5912 12 10

18 000 77 30 14 -18 11 02 2828 5512 08 04

24 000 74 35 20 -09 13 09 2924 4909 04 00

30 000 64 33 39 -22 16 10 2818 4808 03 00

36 000 62 47 49 033 18 11 2519 4708 03 00

42 000 61 59 56 -03 18 11 2621 4205 02 99

48 000 63 64 54 003 18 13 2618 4003 00 97

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