LI

Four-layer lifted index. This is a measure of the possibility of thunderstorms forming, with negative numbers implying instability. Of course, they don't actually send negative numbers; that would be too easy to read. Instead, whenever the lifted index is negative, they add 100 to it. Thus, for example, a lifted index of -2 would be coded as 98. In the example below, the lifted index is strongly positive most of the time, indicating that thunderstorms are very unlikely. The only time with a shot at a thunderstorm is at 12 hours, when the lifted index drops to 2.

OUTPUT FROM ETA 12Z OCT 30 96

TTPTTR1R2R3 VVVLI PSDDFF HHT1T3T5

BOS//605860 00719 131410 56050504

06000818448 04209 091622 56080605

12008935114 00802 002126 59121210

18000773014 -1811 022828 55120804

24000743520 -0913 092924 49090400

30000643339 -2216 102818 48080300

36000624749 03318 112519 47080300

42000615956 -0318 112621 42050299

48000636454 00318 132618 40030097

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