5Bh_Bh_Bh_Bt_L is the forecast turbulence group that is encoded to report all forecast levels of turbulence other than that in thunderstorms (thunderstorms imply severe or extreme tur-bulence). Omit the group when no turbulence is forecast. Use the group as many times as necessary to cover all turbulence conditions.

B is the turbulence type and intensity code from table 4-4-5.

The term occasional in table 4-4-5 means less than one-third of the time.

h_Bh_Bh_B is the height of the base of the tur-bulence layer above the surface (AGL) in hun-dreds of feet, rounded down to the nearest hundred.

t_L is the thickness of the turbulence layer in thousands of feet, rounded up to the nearest thousand. When a layer exceeds 9,000 feet, encode a second group using the top of the 9,000-foot layer in the last group as the base of the layer in the second group.

When extreme turbulence is forecast, use the turbulence group in the forecast (reporting code figures 6, 7, 8, or 9), and add EXTRM TURB

h_Bh_Bh_B-h_th_th_tto the remarks section. The h_Bh_Bh_B is the height of the base of the layer; h_th_th_t is the height of the top of the layer in hundreds of feet.

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