IGC Spy

Glider CU Thermal Info (Task 4 Meter 18 - 1 August 2018)

		Thermal Time			Thermal Alt					Orbits Speed			Orbits Diam			Orbit Time			Climb Rate			Other
ID	Type	Start [hms]	End [hms]	Duration [hms]	Start [ft]	End [ft]	Delta [ft]	Lost [ft]	Lost [%]	Avg (stab) [kts]	Min (stab) [kts]	Max (stab) [kts]	Avg (stab) [m]	Min (stab) [m]	Max (stab) [m]	Avg (stab) [sec]	Min (stab) [sec]	Max (stab) [sec]	Avg (stab) [kts]	Min (stab) [kts]	Max (stab) [kts]	Direction	Track Length [km]	Count
0	All			00:57:01			21220	4297	20.3 %	64.4						29 blah			3.7					23
1	Thermal	11:53:11	11:55:19	00:02:08	7355	8169	813	255	31.5 %	67.9 68.5	54.7 68.5	81.3 68.5	356 325	325 325	441 325	32 29	29 29	40 29	3.9 4.9	2.4 4.2	5.6 5.6	Right	4.5	4
1	Orbit	11:53:11	11:53:41	00:00:30	7355	7529	173	101	58.5 %	67.4			0			30			3.4			Right	1
2	Orbit	11:53:41	11:54:10	00:00:29	7529	7805	275	26	9.5 %	68.5			0			29			5.6			Right	1
3	Orbit	11:54:10	11:54:39	00:00:29	7805	8008	203	55	27.4 %	68.5			0			29			4.2			Right	1
4	Orbit	11:54:39	11:55:19	00:00:40	8008	8169	160	72	44.9 %	67.3			0			40			2.4			Right	1.4
2	Thermal	12:11:33	12:12:43	00:01:10	7050	7496	446	95	21.3 %	64.9 66.6	47.3 66.6	77.1 66.6	249 338	53 338	355 338	23.3 31	5 31	34 31	5.1 3.3	3.3 3.3	8.6 3.3	Left	2.3	3
6	Orbit	12:11:33	12:12:07	00:00:34	7050	7253	203	95	46.8 %	63.8			0			34			3.5			Left	1.1
7	Orbit	12:12:07	12:12:38	00:00:31	7253	7424	170	0	0 %	66.6			0			31			3.3			Left	1.1
8	Orbit	12:12:38	12:12:43	00:00:05	7424	7496	72	0	0 %	64.2			0			05			8.6			Left	0.2
3	Thermal	12:34:06	12:35:57	00:01:51	6811	7549	738	249	33.8 %	67 65.2	48 64.6	76.6 65.8	296 395	36 349	442 442	27.8 37	3 33	41 41	0.4 4.2	-11.7 2.9	5.5 5.5	Left	3.7	4
11	Orbit	12:34:06	12:34:40	00:00:34	6811	7103	291	52	18 %	63.9			0			34			5.1			Left	1.1
12	Orbit	12:34:40	12:35:13	00:00:33	7103	7408	305	19	6.5 %	64.6			0			33			5.5			Left	1.1
13	Orbit	12:35:13	12:35:54	00:00:41	7408	7608	200	118	59 %	65.8			0			41			2.9			Left	1.4
14	Orbit	12:35:54	12:35:57	00:00:03	7608	7549	-59	59	-100 %	73.9			0			03			-11.7			Left	0.1
4	Thermal	12:45:22	12:47:27	00:02:05	6072	6984	912	301	33.1 %	66 66.8	52.3 66	83.1 68	270 266	245 245	294 294	25 24.3	22 22	27 27	4.4 5.4	1.6 3.8	6.8 6.8	Right	4.2	5
16	Orbit	12:45:22	12:45:49	00:00:27	6072	6145	72	98	136.4 %	64.9			0			27			1.6			Right	0.9
17	Orbit	12:45:49	12:46:11	00:00:22	6145	6351	206	65	31.7 %	68			0			22			5.6			Right	0.8
18	Orbit	12:46:11	12:46:35	00:00:24	6351	6627	275	82	29.8 %	66			0			24			6.8			Right	0.8
19	Orbit	12:46:35	12:47:02	00:00:27	6627	6801	173	29	17 %	66.4			0			27			3.8			Right	0.9
20	Orbit	12:47:02	12:47:27	00:00:25	6801	6984	183	26	14.3 %	64.7			0			25			4.4			Right	0.8
5	Thermal	13:02:20	13:04:04	00:01:44	4662	5111	449	262	58.4 %	66.8 65.5	44.6 65.5	80.1 65.5	381 333	323 333	487 333	34.7 31	30 31	43 31	2.7 5.3	1.2 5.3	5.3 5.3	Left	3.6	3
22	Orbit	13:02:20	13:02:50	00:00:30	4662	4750	88	111	125.9 %	65.7			0			30			1.7			Left	1
23	Orbit	13:02:50	13:03:21	00:00:31	4750	5026	275	52	19 %	65.5			0			31			5.3			Left	1
24	Orbit	13:03:21	13:04:04	00:00:43	5026	5111	85	98	115.4 %	69.2			0			43			1.2			Left	1.5
6	Thermal	13:10:27	13:12:48	00:02:21	4767	5574	807	324	40.2 %	66.1 67.1	53.3 64	79.4 70.2	380 342	294 294	512 391	35.3 31	28 28	49 34	3.4 3.4	3.3 3.3	3.4 3.4	Left	4.8	4
27	Orbit	13:10:27	13:10:57	00:00:30	4767	4940	173	137	79.2 %	66.2			0			30			3.4			Left	1
28	Orbit	13:10:57	13:11:31	00:00:34	4940	5131	190	62	32.8 %	70.2			0			34			3.3			Left	1.2
29	Orbit	13:11:31	13:11:59	00:00:28	5131	5291	160	65	40.8 %	64			0			28			3.4			Left	0.9
30	Orbit	13:11:59	13:12:48	00:00:49	5291	5574	282	59	20.9 %	63.8			1000			49			3.4			Left	1.6
7	Thermal	13:13:25	13:15:30	00:02:05	5685	6174	488	203	41.6 %	67.3 67.3	49.2 67.3	80.3 67.3	457 452	440 452	481 452	41.7 41	38 41	46 41	2.2 3.1	0.6 3.1	3.1 3.1	Right	4.3	3
31	Orbit	13:13:25	13:14:11	00:00:46	5685	5921	236	52	22.2 %	63.8			0			46			3			Right	1.5
32	Orbit	13:14:11	13:14:52	00:00:41	5921	6135	213	68	32.3 %	67.3			0			41			3.1			Right	1.4
33	Orbit	13:14:52	13:15:30	00:00:38	6135	6174	39	82	208.3 %	70.7			0			38			0.6			Right	1.4
8	Thermal	13:22:01	13:24:30	00:02:29	4996	6046	1049	137	13.1 %	64.2 65	45.3 63.6	87.7 66.5	392 543	122 305	781 781	37.3 51.5	12 28	75 75	3.7 4.7	1.9 4.5	4.9 4.9	Mixed	4.9	4
34	Orbit	13:22:01	13:22:35	00:00:34	4996	5203	206	45	22.2 %	64.8			0			34			3.6			Left	1.1
36	Orbit	13:23:50	13:24:18	00:00:28	5774	6007	232	9	4.2 %	66.5			0			28			4.9			Right	1
37	Orbit	13:24:18	13:24:30	00:00:12	6007	6046	39	16	41.7 %	61.8			0			12			1.9			Right	0.4
9	Thermal	13:24:35	13:25:39	00:01:04	6138	6784	646	42	6.6 %	71.7 66.6	49.9 66.6	86.7 66.6	228 371	28 371	371 371	21.3 34	2 34	34 34	4.5 4.8	1 4.8	7.8 4.8	Left	2.1	3
38	Orbit	13:24:35	13:25:03	00:00:28	6138	6505	367	13	3.6 %	61.8			0			28			7.8			Left	0.9
39	Orbit	13:25:03	13:25:37	00:00:34	6505	6781	275	29	10.7 %	66.6			0			34			4.8			Left	1.2
40	Orbit	13:25:37	13:25:39	00:00:02	6781	6784	3	0	0 %	86.7			0			02			1			Left	0.1
10	Thermal	13:37:40	13:40:31	00:02:51	4983	6079	1095	183	16.8 %	64.5 64.4	48.4 63.1	80.8 65.5	301 292	280 289	356 298	28.5 27.8	26 27	34 28	3.8 4.3	2.1 4	4.5 4.5	Left	5.7	6
41	Orbit	13:37:40	13:38:14	00:00:34	4983	5177	193	78	40.7 %	63.9			0			34			3.4			Left	1.1
42	Orbit	13:38:14	13:38:42	00:00:28	5177	5383	206	39	19 %	63.1			0			28			4.4			Left	0.9
43	Orbit	13:38:42	13:39:10	00:00:28	5383	5574	190	16	8.6 %	63.9			0			28			4			Left	0.9
44	Orbit	13:39:10	13:39:37	00:00:27	5574	5774	200	3	1.6 %	65.5			0			27			4.4			Left	0.9
45	Orbit	13:39:37	13:40:05	00:00:28	5774	5987	213	13	6.2 %	64.9			0			28			4.5			Left	0.9
46	Orbit	13:40:05	13:40:31	00:00:26	5987	6079	91	32	35.7 %	65.7			0			26			2.1			Left	0.9
11	Thermal	13:44:53	13:49:10	00:04:17	5144	6610	1466	173	11.9 %	65.9 64.8	51.7 63	76.2 66.3	305 335	96 298	380 380	28.6 31.6	8 28	36 36	3.5 3.5	2.6 3	4.6 4	Left	8.6	9
47	Orbit	13:44:53	13:45:21	00:00:28	5144	5265	121	62	51.4 %	66.1			0			28			2.6			Left	1
48	Orbit	13:45:21	13:45:57	00:00:36	5265	5459	193	32	16.9 %	63			0			36			3.2			Left	1.2
49	Orbit	13:45:57	13:46:28	00:00:31	5459	5669	209	6	3.1 %	64.2			0			31			4			Left	1
50	Orbit	13:46:28	13:47:00	00:00:32	5669	5859	190	13	6.9 %	64.3			0			32			3.5			Left	1.1
51	Orbit	13:47:00	13:47:28	00:00:28	5859	6020	160	3	2 %	64.9			0			28			3.4			Left	0.9
52	Orbit	13:47:28	13:47:57	00:00:29	6020	6200	180	19	10.9 %	65.2			0			29			3.7			Left	1
53	Orbit	13:47:57	13:48:27	00:00:30	6200	6371	170	13	7.7 %	65.4			0			30			3.4			Left	1
54	Orbit	13:48:27	13:49:02	00:00:35	6371	6548	177	22	13 %	66.3			0			35			3			Left	1.2
55	Orbit	13:49:02	13:49:10	00:00:08	6548	6610	62	0	0 %	73.5			0			08			4.6			Left	0.3
12	Thermal	13:57:11	14:02:23	00:05:12	4668	6049	1381	285	20.7 %	63.9 63.6	47 62.1	82.6 66.4	325 334	203 283	403 403	31.2 32.1	18 26	39 39	2.6 2.7	1.8 2	4.3 4.3	Right	10.2	10
56	Orbit	13:57:11	13:57:48	00:00:37	4668	4862	193	19	10.2 %	61			0			37			3.1			Right	1.2
57	Orbit	13:57:48	13:58:22	00:00:34	4862	4990	127	32	25.6 %	63.7			0			34			2.2			Right	1.1
58	Orbit	13:58:22	13:58:54	00:00:32	4990	5124	134	32	24.4 %	63.5			0			32			2.5			Right	1
59	Orbit	13:58:54	13:59:33	00:00:39	5124	5275	150	55	37 %	63.2			0			39			2.3			Right	1.3
60	Orbit	13:59:33	14:00:04	00:00:31	5275	5393	118	22	19.4 %	63.9			0			31			2.3			Right	1
61	Orbit	14:00:04	14:00:35	00:00:31	5393	5528	134	32	24.4 %	62.6			0			31			2.6			Right	1
62	Orbit	14:00:35	14:01:01	00:00:26	5528	5715	187	3	1.8 %	66.4			0			26			4.3			Right	0.9
63	Orbit	14:01:01	14:01:31	00:00:30	5715	5879	164	16	10 %	63.5			0			30			3.2			Right	1
64	Orbit	14:01:31	14:02:05	00:00:34	5879	5994	114	29	25.7 %	62.1			0			34			2			Right	1.1
65	Orbit	14:02:05	14:02:23	00:00:18	5994	6049	55	39	70.6 %	68.9			0			18			1.8			Right	0.6
13	Thermal	14:12:11	14:13:46	00:01:35	3953	4419	465	121	26.1 %	63.2 59.9	45.2 59.5	83.9 60.2	239 309	22 302	316 316	23.8 31.5	2 31	32 32	3.8 2.7	2.4 2.4	6.8 3.1	Left	3	4
66	Orbit	14:12:11	14:12:41	00:00:30	3953	4107	154	49	31.9 %	64.4			0			30			3			Left	1
67	Orbit	14:12:41	14:13:12	00:00:31	4107	4268	160	22	14.3 %	59.5			0			31			3.1			Left	0.9
68	Orbit	14:13:12	14:13:44	00:00:32	4268	4396	127	49	38.5 %	60.2			0			32			2.4			Left	1
69	Orbit	14:13:44	14:13:46	00:00:02	4396	4419	22	0	0 %	68.5			0			02			6.8			Left	0.1
14	Thermal	14:13:52	14:17:27	00:03:35	4534	6131	1597	305	19.1 %	65.9 64.5	46.4 60.8	83.3 66.1	289 294	259 259	333 333	26.9 27.8	23 25	31 31	4.3 5.4	-1.6 4.3	6.1 6.1	Left	7.3	8
70	Orbit	14:13:52	14:14:17	00:00:25	4534	4671	137	59	42.9 %	63.4			0			25			3.3			Left	0.8
71	Orbit	14:14:17	14:14:43	00:00:26	4671	4862	190	13	6.9 %	60.8			0			26			4.3			Left	0.8
72	Orbit	14:14:43	14:15:11	00:00:28	4862	5134	272	19	7.2 %	64.5			0			28			5.8			Left	0.9
73	Orbit	14:15:11	14:15:36	00:00:25	5134	5387	252	16	6.5 %	64.7			0			25			6			Left	0.8
74	Orbit	14:15:36	14:16:04	00:00:28	5387	5666	278	6	2.4 %	66.1			0			28			5.9			Left	1
75	Orbit	14:16:04	14:16:33	00:00:29	5666	5964	298	0	0 %	64.9			0			29			6.1			Left	1
76	Orbit	14:16:33	14:17:04	00:00:31	5964	6194	229	39	17.1 %	65.6			0			31			4.4			Left	1
77	Orbit	14:17:04	14:17:27	00:00:23	6194	6131	-62	150	-242.1 %	76.7			0			23			-1.6			Left	0.9
15	Thermal	14:20:29	14:21:43	00:01:14	5629	5980	351	88	25.2 %	64.9 64.9	46.5 64.6	81.4 65.1	393 393	384 384	402 402	37 37	36 36	38 38	2.8 2.8	2.8 2.8	2.9 2.9	Left	2.5	2
78	Orbit	14:20:29	14:21:05	00:00:36	5629	5803	173	49	28.3 %	65.1			0			36			2.9			Left	1.2
79	Orbit	14:21:05	14:21:43	00:00:38	5803	5980	177	39	22.2 %	64.6			0			38			2.8			Left	1.3
16	Thermal	14:31:44	14:35:14	00:03:30	4990	6617	1627	206	12.7 %	68.3 68	49.4 66.2	85.6 69.8	391 354	310 310	494 392	35 31.8	28 28	43 35	4.7 5	3.6 3.6	6.3 6.3	Left	7.4	6
82	Orbit	14:31:44	14:32:27	00:00:43	4990	5291	301	29	9.8 %	62.2			0			43			4.2			Left	1.4
83	Orbit	14:32:27	14:32:57	00:00:30	5291	5613	321	9	3.1 %	66.2			0			30			6.3			Left	1
84	Orbit	14:32:57	14:33:25	00:00:28	5613	5839	226	36	15.9 %	67.6			0			28			4.8			Left	1
85	Orbit	14:33:25	14:33:59	00:00:34	5839	6145	305	22	7.5 %	69.8			0			34			5.3			Left	1.2
86	Orbit	14:33:59	14:34:34	00:00:35	6145	6354	209	59	28.1 %	68.5			0			35			3.6			Left	1.2
87	Orbit	14:34:34	14:35:14	00:00:40	6354	6617	262	49	18.8 %	75.4			0			40			3.9			Left	1.6
17	Thermal	14:46:13	14:49:13	00:03:00	5091	6889	1797	259	14.4 %	66.8 63	48 60.9	103.5 67.7	236 247	126 239	278 263	22.5 24	8 23	28 26	5 6.8	-5.6 3.9	7.8 7.8	Left	5.9	8
88	Orbit	14:46:13	14:46:41	00:00:28	5091	5298	206	108	52.4 %	60.7			0			28			4.4			Left	0.9
89	Orbit	14:46:41	14:47:04	00:00:23	5298	5580	282	19	7 %	63.6			0			23			7.3			Left	0.8
90	Orbit	14:47:04	14:47:30	00:00:26	5580	5882	301	3	1.1 %	61.7			0			26			6.9			Left	0.8
91	Orbit	14:47:30	14:47:54	00:00:24	5882	6197	314	3	1 %	60.9			0			24			7.8			Left	0.8
92	Orbit	14:47:54	14:48:18	00:00:24	6197	6502	305	3	1.1 %	62.2			0			24			7.5			Left	0.8
93	Orbit	14:48:18	14:48:42	00:00:24	6502	6814	311	0	0 %	62			0			24			7.7			Left	0.8
94	Orbit	14:48:42	14:49:05	00:00:23	6814	6965	150	45	30.4 %	67.7			0			23			3.9			Left	0.8
95	Orbit	14:49:05	14:49:13	00:00:08	6965	6889	-75	75	-100 %	95.9			0			08			-5.6			Left	0.4
18	Thermal	14:52:37	14:54:24	00:01:47	6404	6932	528	127	24.2 %	68.5 64.2	52.9 63.8	87.2 64.6	290 321	174 313	346 328	26.8 30.5	13 30	33 31	2.2 3.7	-1.9 3.6	3.9 3.9	Left	3.6	4
96	Orbit	14:52:37	14:53:10	00:00:33	6404	6591	187	55	29.8 %	64.1			0			33			3.4			Left	1.1
97	Orbit	14:53:10	14:53:40	00:00:30	6591	6788	196	16	8.3 %	63.8			0			30			3.9			Left	1
98	Orbit	14:53:40	14:54:11	00:00:31	6788	6975	187	6	3.5 %	64.6			0			31			3.6			Left	1
99	Orbit	14:54:11	14:54:24	00:00:13	6975	6932	-42	49	-115.4 %	81.6			0			13			-1.9			Left	0.5
19	Thermal	14:59:38	15:01:01	00:01:23	5823	6062	239	98	41.1 %	64.7 64.7	48.9 63.5	85.4 65.8	439 439	410 410	468 468	41.5 41.5	38 38	45 45	1.6 1.6	0.9 0.9	2.4 2.4	Left	2.8	2
100	Orbit	14:59:38	15:00:23	00:00:45	5823	6007	183	36	19.6 %	63.5			0			45			2.4			Left	1.5
101	Orbit	15:00:23	15:01:01	00:00:38	6007	6062	55	62	111.8 %	65.8			0			38			0.9			Left	1.3
20	Thermal	15:22:32	15:30:53	00:08:21	4183	7519	3336	347	10.4 %	56.5 55.9	41.8 53.4	94.6 59.3	258 250	221 221	353 312	27.8 27.3	24 24	38 33	4 4.3	0.3 3	5.8 5.8	Left	14.6	18
105	Orbit	15:22:32	15:23:10	00:00:38	4183	4370	187	42	22.8 %	56.7			0			38			2.9			Left	1.1
106	Orbit	15:23:10	15:23:36	00:00:26	4370	4530	160	26	16.3 %	55.5			0			26			3.7			Left	0.7
107	Orbit	15:23:36	15:24:02	00:00:26	4530	4668	137	19	14.3 %	55.1			0			26			3.1			Left	0.7
108	Orbit	15:24:02	15:24:29	00:00:27	4668	4806	137	36	26.2 %	55.8			0			27			3			Left	0.8
109	Orbit	15:24:29	15:24:58	00:00:29	4806	5006	200	13	6.6 %	57.6			0			29			4.1			Left	0.9
110	Orbit	15:24:58	15:25:25	00:00:27	5006	5213	206	6	3.2 %	54.2			0			27			4.5			Left	0.8
111	Orbit	15:25:25	15:25:51	00:00:26	5213	5396	183	13	7.1 %	53.4			0			26			4.2			Left	0.7
112	Orbit	15:25:51	15:26:17	00:00:26	5396	5603	206	16	7.9 %	55.1			0			26			4.7			Left	0.7
113	Orbit	15:26:17	15:26:43	00:00:26	5603	5807	203	9	4.8 %	54.6			0			26			4.6			Left	0.7
114	Orbit	15:26:43	15:27:07	00:00:24	5807	6007	200	0	0 %	56.2			0			24			4.9			Left	0.7
115	Orbit	15:27:07	15:27:32	00:00:25	6007	6213	206	3	1.6 %	55.5			0			25			4.9			Left	0.7
116	Orbit	15:27:32	15:27:58	00:00:26	6213	6466	252	0	0 %	55.3			0			26			5.8			Left	0.7
117	Orbit	15:27:58	15:28:25	00:00:27	6466	6673	206	0	0 %	55.4			0			27			4.5			Left	0.8
118	Orbit	15:28:25	15:28:53	00:00:28	6673	6902	229	9	4.3 %	55			0			28			4.9			Left	0.8
119	Orbit	15:28:53	15:29:22	00:00:29	6902	7089	187	32	17.5 %	57.8			0			29			3.8			Left	0.9
120	Orbit	15:29:22	15:29:53	00:00:31	7089	7296	206	0	0 %	59.3			0			31			4			Left	0.9
121	Orbit	15:29:53	15:30:26	00:00:33	7296	7506	209	13	6.3 %	57.7			0			33			3.8			Left	1
122	Orbit	15:30:26	15:30:53	00:00:27	7506	7519	13	104	800 %	67.2			0			27			0.3			Left	0.9
21	Thermal	15:49:29	15:50:29	00:01:00	3402	3671	269	72	26.8 %	50.8 50.8	37.2 47.9	72.8 53.7	252 252	188 188	317 317	30 30	24 24	36 36	2.5 2.5	1.8 1.8	3.2 3.2	Right	1.6	2
123	Orbit	15:49:29	15:50:05	00:00:36	3402	3599	196	49	25 %	53.7			0			36			3.2			Right	1
124	Orbit	15:50:05	15:50:29	00:00:24	3599	3671	72	22	31.8 %	47.9			0			24			1.8			Right	0.6
22	Thermal	15:50:34	15:51:38	00:01:04	3687	3986	298	91	30.8 %	58.1 58.1	46 57.8	80.1 58.5	305 305	274 274	335 335	32 32	29 29	35 35	2.7 2.7	2.1 2.1	3.3 3.3	Right	1.9	2
125	Orbit	15:50:34	15:51:09	00:00:35	3687	3884	196	49	25 %	58.5			0			35			3.3			Right	1.1
126	Orbit	15:51:09	15:51:38	00:00:29	3884	3986	101	42	41.9 %	57.8			0			29			2.1			Right	0.9
23	Thermal	15:51:52	15:53:07	00:01:15	4002	4416	413	62	15.1 %	58 55.3	43.8 55.3	69.3 55.3	234 299	89 299	313 299	25 33	9 33	33 33	3.5 2.1	2.1 2.1	4.2 2.1	Right	2.2	3
127	Orbit	15:51:52	15:52:25	00:00:33	4002	4235	232	16	7 %	58			0			33			4.2			Right	1
128	Orbit	15:52:25	15:52:58	00:00:33	4235	4353	118	36	30.6 %	55.3			0			33			2.1			Right	0.9
129	Orbit	15:52:58	15:53:07	00:00:09	4353	4416	62	9	15.8 %	60.7			0			09			4.1			Right	0.3

Color of the track indicates climb rate
Width of the track indicates ground speed (not air speed)
Pink arrow indicates wind (not always reliable)
Fire indicates thermal source based on wind

IGC-SPY Gliders Competitions Flight LOG analysis (CU)

Glider CU Thermal Info (Task 4 Meter 18 - 1 August 2018)

Color of the track indicates climb rate Width of the track indicates ground speed (not air speed) Pink arrow indicates wind (not always reliable) Fire indicates thermal source based on wind

Color of the track indicates climb rate
Width of the track indicates ground speed (not air speed)
Pink arrow indicates wind (not always reliable)
Fire indicates thermal source based on wind