ACTIVE LAYERS PREDICTION THROUGH GFS MODEL FORECAST
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NIGHT	HOUR-UT	ACTIVE LAYERS KM(MASS)	FORECASTED BY GFS KM
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16-17	00-03	0.5-3.5, 10-16   	CL : 12-16+, AL : 3-4			
	03-06	10-16			CL : 14-16+, AL : none
	06-09	10-16, 3-6		CL : 14-16+, AL : 4
17-18	00-03	Ground, 10-16		CL : 12-16+, AL : ground-4
	03-06	10-16			CL : 11-16+, AL : none
	06-09	10-16			CL : 11-16+, AL : none
18-19	00-03	Ground, 3-16		CL : ground-3, 11-16+, AL : none
	03-06	3-16			CL : ground-3, 11-16+, AL : none
	06-09	Ground-16		CL : ground-3, 11-16+, AL : none
19-20	00-03	1.5-16			CL : 12-16+, AL : none
	03-06	Ground, 8-10		CL : 14-16+, AL : none
	06-09	Ground			CL : 14-16+, AL : none
20-21	00-03	ALL (main:4)		CL : 14-16+, AL : 6-7
	03-06	ALL (main:4)		CL : 12-16+, AL : 6-7.5
	06-09	ALL (main:4)		CL : 12-16+, AL : 6-7.5
21-22	00-03	1-8 (main:4)		CL : 12-16+, AL : none
	03-06	1-8 (main:4)		CL : 14-16+, 3-4, AL : 7.5-9      	<-------------------- INTERESTING !! link between CL-AL
	06-09	1-8 (main:4)		CL : 14-16+, 3-4, 7.5-9, AL : none      <-------------------- INTERESTING !! link between CL-AL
22-23	00-03	ground-4		CL : ground-3.5, 14-16+, AL : 5-6
	03-06	2-6			CL : ground-4, 14-16+, AL : 5-6.5
	06-09	3-5			CL : 4.5-6.5, 14-16+, AL: none		<-------------------- INTERESTING !! link between CL-AL
23-24	00-03	NO DATA
	03-06	NO DATA
	06-09	NO DATA
24-25	00-03	ground-12 (main:7-8)	CL : 5, 10-16, AL : ground
	03-06	ground, 8		CL : 3.5-5, 10-16, AL : none
	06-09	main:7-8		CL : 4-5, 10-16, AL : 6
25-26	00-03
	03-06
	06-09
26-27	00-03
	03-06
	06-09
27-28	00-03
	03-06
	06-09
28-29	00-03
	03-06
	06-09
29-30	00-03
	03-06
	06-09

CL : So-called Critical Layers (definition by ARL-NOAA : dT/dz > 0.005, and DT > 2K).
AL : Not specifically defined. Here are depicted only the relevant cases where an instability is apparent in the turbulence profile

NB: As GFS does not take in account mountains, parameters forecasts between 0-5 might be wrong. In this
study it was assumed that the main layers remain the same but with a change in their structure.

"10-16" means that the layer is between 10 and 16 kilometers high.
"5, 7" means that there are two layers, 5 km and 7 km high.

GFS forecast issued at 00Z (beginnig of the astronomical twilight, here at Paranal)