IGC Spy

Glider FNC Thermal Info (Practice 3-20m multi-seat)

		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			00:51:17			25387	1325	5.2 %	62.7						25 00:00:27 blah			4.9					22
1	Thermal	11:44:04	11:45:46	00:01:42	7283	8612	1328	3	0.2 %	63.7 64.7	47.9 64.5	76.9 64.9	266 265	252 255	281 275	25.5 25	24 24	26 26	7.7 8.3	7.1 7.6	8.9 8.9	Left	3.3	4
1	Orbit	11:44:04	11:44:30	00:00:26	7283	7595	311	0	0 %	66			0			26			7.1			Left	0.9
2	Orbit	11:44:30	11:44:56	00:00:26	7595	7929	334	3	1 %	64.5			0			26			7.6			Left	0.9
3	Orbit	11:44:56	11:45:20	00:00:24	7929	8290	360	0	0 %	64.9			0			24			8.9			Left	0.8
4	Orbit	11:45:20	11:45:46	00:00:26	8290	8612	321	0	0 %	59.2			0			26			7.3			Left	0.8
2	Thermal	12:10:53	12:12:10	00:01:17	4340	4734	393	75	19.2 %	56.9 59.1	45 59.1	68 59.1	240 251	190 251	280 251	25.7 26	22 26	29 26	3 3.4	1.9 3.4	3.5 3.4	Mixed	2.3	3
8	Orbit	12:10:53	12:11:22	00:00:29	4340	4511	170	19	11.5 %	58.9			0			29			3.5			Right	0.9
9	Orbit	12:11:22	12:11:48	00:00:26	4511	4662	150	6	4.3 %	59.1			0			26			3.4			Right	0.8
10	Orbit	12:11:48	12:12:10	00:00:22	4662	4734	72	49	68.2 %	52.7			0			22			1.9			Left	0.6
3	Thermal	12:17:40	12:19:27	00:01:47	5009	6151	1141	3	0.3 %	62.1 62.2	55.5 61.7	70 62.6	272 265	263 263	287 267	26.8 26	26 26	29 26	6.3 5.9	5.8 5.8	7 6	Left	3.4	4
15	Orbit	12:17:40	12:18:06	00:00:26	5009	5314	305	0	0 %	63.4			0			26			7			Left	0.8
16	Orbit	12:18:06	12:18:32	00:00:26	5314	5577	262	0	0 %	61.7			0			26			6			Left	0.8
17	Orbit	12:18:32	12:18:58	00:00:26	5577	5833	255	0	0 %	62.6			0			26			5.8			Left	0.8
18	Orbit	12:18:58	12:19:27	00:00:29	5833	6151	318	3	1 %	60.5			0			29			6.5			Left	0.9
4	Thermal	12:23:32	12:27:23	00:03:51	5600	7526	1925	52	2.7 %	62 61.6	54.1 60.2	70.7 63.6	292 301	251 279	336 336	28.9 29.8	24 27	34 34	4.9 4.9	4 4.6	5.9 5.8	Left	7.3	8
19	Orbit	12:23:32	12:24:00	00:00:28	5600	5787	187	29	15.8 %	62.1			0			28			4			Left	0.9
20	Orbit	12:24:00	12:24:32	00:00:32	5787	6099	311	0	0 %	60.2			0			32			5.8			Left	1
21	Orbit	12:24:32	12:25:01	00:00:29	6099	6338	239	0	0 %	60.9			0			29			4.9			Left	0.9
22	Orbit	12:25:01	12:25:35	00:00:34	6338	6617	278	9	3.5 %	60.4			0			34			4.9			Left	1.1
23	Orbit	12:25:35	12:26:02	00:00:27	6617	6827	209	0	0 %	63.6			0			27			4.6			Left	0.9
24	Orbit	12:26:02	12:26:29	00:00:27	6827	7037	209	0	0 %	63.1			0			27			4.6			Left	0.9
25	Orbit	12:26:29	12:26:59	00:00:30	7037	7286	249	13	5.3 %	61.7			0			30			4.9			Left	1
26	Orbit	12:26:59	12:27:23	00:00:24	7286	7526	239	0	0 %	63.8			0			24			5.9			Left	0.8
5	Thermal	12:28:54	12:30:18	00:01:24	7473	8303	830	55	6.7 %	62.3 61.4	54 61	74 61.8	215 286	20 263	310 310	21 28.5	2 26	31 31	4.1 6	-1.9 5	7 7	Left	2.7	4
27	Orbit	12:28:54	12:29:19	00:00:25	7473	7742	269	42	15.9 %	65.4			0			25			6.4			Left	0.8
28	Orbit	12:29:19	12:29:45	00:00:26	7742	8051	308	0	0 %	61.8			0			26			7			Left	0.8
29	Orbit	12:29:45	12:30:16	00:00:31	8051	8310	259	6	2.5 %	61			0			31			5			Left	1
30	Orbit	12:30:16	12:30:18	00:00:02	8310	8303	-6	6	-100 %	61.2			0			02			-1.9			Left	0.1
6	Thermal	12:43:31	12:46:47	00:03:16	5219	7585	2365	36	1.5 %	63.8 64.5	52 63.1	76.7 66.6	258 280	58 251	326 314	24.5 26.5	6 23	31 30	7 7.4	5.1 5.1	9 9	Left	6.5	8
31	Orbit	12:43:31	12:44:02	00:00:31	5219	5574	354	19	5.6 %	64.3			0			31			6.8			Left	1
32	Orbit	12:44:02	12:44:29	00:00:27	5574	5944	370	0	0 %	63.1			0			27			8.1			Left	0.9
33	Orbit	12:44:29	12:44:52	00:00:23	5944	6292	347	0	0 %	66.6			0			23			9			Left	0.8
34	Orbit	12:44:52	12:45:17	00:00:25	6292	6643	351	0	0 %	65.4			0			25			8.3			Left	0.8
35	Orbit	12:45:17	12:45:44	00:00:27	6643	6981	337	0	0 %	63.2			0			27			7.4			Left	0.9
36	Orbit	12:45:44	12:46:11	00:00:27	6981	7273	291	0	0 %	64.7			0			27			6.4			Left	0.9
37	Orbit	12:46:11	12:46:41	00:00:30	7273	7532	259	16	6.3 %	64			0			30			5.1			Left	1
38	Orbit	12:46:41	12:46:47	00:00:06	7532	7585	52	0	0 %	58.9			0			06			5.2			Left	0.2
7	Thermal	12:59:40	13:00:42	00:01:02	5774	5902	127	223	174.4 %	68.5 64.8	57.8 64.8	86.8 64.8	224 287	100 287	287 287	20.7 27	8 27	27 27	-0.9 2.1	-7.8 2.1	3 2.1	Right	2.1	3
43	Orbit	12:59:40	13:00:07	00:00:27	5774	5912	137	88	64.3 %	64.5			0			27			3			Right	0.9
44	Orbit	13:00:07	13:00:34	00:00:27	5912	6007	95	29	31 %	64.8			0			27			2.1			Right	0.9
45	Orbit	13:00:34	13:00:42	00:00:08	6007	5902	-104	104	-100 %	76.2			0			08			-7.8			Right	0.3
8	Thermal	13:07:35	13:10:32	00:02:57	3497	5009	1512	45	3 %	62.3 63	50.9 61.8	70.4 65	228 252	37 223	279 279	22.1 24.5	4 21	27 27	5.1 5.1	4.4 4.4	5.8 5.5	Right	5.7	8
46	Orbit	13:07:35	13:08:01	00:00:26	3497	3694	196	9	5 %	64.2			0			26			4.5			Right	0.9
47	Orbit	13:08:01	13:08:28	00:00:27	3694	3933	239	6	2.7 %	63			0			27			5.3			Right	0.9
48	Orbit	13:08:28	13:08:52	00:00:24	3933	4110	177	13	7.4 %	63.3			0			24			4.4			Right	0.8
49	Orbit	13:08:52	13:09:13	00:00:21	4110	4294	183	0	0 %	65			0			21			5.2			Right	0.7
50	Orbit	13:09:13	13:09:39	00:00:26	4294	4534	239	6	2.7 %	62			0			26			5.5			Right	0.8
51	Orbit	13:09:39	13:10:04	00:00:25	4534	4747	213	6	3.1 %	61.8			0			25			5.1			Right	0.8
52	Orbit	13:10:04	13:10:28	00:00:24	4747	4970	223	3	1.5 %	62.8			0			24			5.5			Right	0.8
53	Orbit	13:10:28	13:10:32	00:00:04	4970	5009	39	0	0 %	56.1			0			04			5.8			Right	0.1
9	Thermal	13:10:55	13:12:03	00:01:08	5193	5636	442	19	4.4 %	64 64.1	58.2 64.1	70.2 64.1	237 263	147 263	303 263	22.7 25	14 25	29 25	4.1 3.9	3.3 3.9	5 3.9	Right	2.2	3
54	Orbit	13:10:55	13:11:24	00:00:29	5193	5354	160	9	6.1 %	63.8			0			29			3.3			Right	1
55	Orbit	13:11:24	13:11:49	00:00:25	5354	5518	164	9	6 %	64.1			0			25			3.9			Right	0.8
56	Orbit	13:11:49	13:12:03	00:00:14	5518	5636	118	0	0 %	63.9			0			14			5			Right	0.5
10	Thermal	13:12:07	13:13:53	00:01:46	5695	6384	688	85	12.4 %	65.9 64	58.3 63	78.7 65.4	225 265	82 257	271 271	21.2 25.3	7 24	26 26	2.3 4.5	-6.9 3.2	5.8 5.8	Right	3.5	5
57	Orbit	13:12:07	13:12:30	00:00:23	5695	5892	196	0	0 %	66.2			0			23			5.1			Right	0.8
58	Orbit	13:12:30	13:12:54	00:00:24	5892	6125	232	0	0 %	65.4			0			24			5.8			Right	0.8
59	Orbit	13:12:54	13:13:20	00:00:26	6125	6325	200	0	0 %	63.6			0			26			4.6			Right	0.9
60	Orbit	13:13:20	13:13:46	00:00:26	6325	6466	141	3	2.3 %	63			0			26			3.2			Right	0.8
61	Orbit	13:13:46	13:13:53	00:00:07	6466	6384	-82	82	-100 %	71.5			0			07			-6.9			Right	0.3
11	Thermal	13:26:41	13:29:01	00:02:20	2513	3169	656	177	27 %	60.1 60.7	51.8 57.3	73.5 63.4	275 284	221 252	319 319	28 28.7	23 25	34 34	2.9 2.5	1.7 1.7	4.9 3.5	Right	4.3	5
62	Orbit	13:26:41	13:27:12	00:00:31	2513	2631	118	95	80.6 %	59.4			0			31			2.3			Right	0.9
63	Orbit	13:27:12	13:27:46	00:00:34	2631	2726	95	65	69 %	57.3			0			34			1.7			Right	1
64	Orbit	13:27:46	13:28:11	00:00:25	2726	2874	147	13	8.9 %	61.5			0			25			3.5			Right	0.8
65	Orbit	13:28:11	13:28:38	00:00:27	2874	2979	104	3	3.1 %	63.4			0			27			2.3			Right	0.9
66	Orbit	13:28:38	13:29:01	00:00:23	2979	3169	190	0	0 %	58.7			0			23			4.9			Right	0.7
12	Thermal	13:29:05	13:31:45	00:02:40	3208	4150	941	62	6.6 %	58.8 59.4	49.4 58.3	65.6 60.7	258 287	65 246	353 353	26.7 29.5	7 25	37 37	3.2 3.8	0.6 3.1	4.2 4.2	Right	4.9	6
67	Orbit	13:29:05	13:29:40	00:00:35	3208	3402	193	9	5.1 %	58.6			0			35			3.3			Right	1.1
68	Orbit	13:29:40	13:30:05	00:00:25	3402	3579	177	9	5.6 %	60			0			25			4.2			Right	0.8
69	Orbit	13:30:05	13:30:32	00:00:27	3579	3763	183	13	7.1 %	60.7			0			27			4			Right	0.8
70	Orbit	13:30:32	13:31:01	00:00:29	3763	3950	187	3	1.8 %	58.7			0			29			3.8			Right	0.9
71	Orbit	13:31:01	13:31:38	00:00:37	3950	4143	193	22	11.9 %	58.3			0			37			3.1			Right	1.1
72	Orbit	13:31:38	13:31:45	00:00:07	4143	4150	6	3	50 %	56.3			0			07			0.6			Right	0.2
13	Thermal	13:34:17	13:40:14	00:05:57	3914	7066	3152	13	0.4 %	62 62.3	54.2 59.8	70.4 64.4	260 277	19 254	297 297	25.5 27.2	2 26	29 29	5.6 5.3	4 4.3	10.7 6.2	Right	11.4	14
74	Orbit	13:34:17	13:34:46	00:00:29	3914	4107	193	13	6.8 %	62.4			0			29			4			Right	0.9
75	Orbit	13:34:46	13:35:13	00:00:27	4107	4304	196	0	0 %	61.2			0			27			4.3			Right	0.9
76	Orbit	13:35:13	13:35:39	00:00:26	4304	4511	206	0	0 %	59.8			0			26			4.7			Right	0.8
77	Orbit	13:35:39	13:36:06	00:00:27	4511	4727	216	0	0 %	60.2			0			27			4.8			Right	0.8
78	Orbit	13:36:06	13:36:32	00:00:26	4727	4960	232	0	0 %	62.6			0			26			5.3			Right	0.8
79	Orbit	13:36:32	13:37:01	00:00:29	4960	5246	285	0	0 %	62.4			0			29			5.8			Right	0.9
80	Orbit	13:37:01	13:37:29	00:00:28	5246	5541	295	0	0 %	61.2			0			28			6.2			Right	0.9
81	Orbit	13:37:29	13:37:56	00:00:27	5541	5777	236	0	0 %	63.2			0			27			5.2			Right	0.9
82	Orbit	13:37:56	13:38:23	00:00:27	5777	6046	269	0	0 %	64.4			0			27			5.9			Right	0.9
83	Orbit	13:38:23	13:38:51	00:00:28	6046	6335	288	0	0 %	61.9			0			28			6.1			Right	0.9
84	Orbit	13:38:51	13:39:19	00:00:28	6335	6574	239	0	0 %	63.1			0			28			5.1			Right	0.9
85	Orbit	13:39:19	13:39:45	00:00:26	6574	6801	226	0	0 %	63.3			0			26			5.2			Right	0.8
86	Orbit	13:39:45	13:40:12	00:00:27	6801	7030	229	0	0 %	63.8			0			27			5			Right	0.9
87	Orbit	13:40:12	13:40:14	00:00:02	7030	7066	36	0	0 %	58.2			0			02			10.7			Right	0.1
14	Thermal	13:51:42	13:54:40	00:02:58	3700	5039	1338	131	9.8 %	59.8 59.2	49.6 57.6	69.4 61.1	290 286	273 283	324 290	29.7 29.5	27 29	33 30	4.5 4.7	3.5 4.3	5.1 5.1	Left	5.5	6
88	Orbit	13:51:42	13:52:15	00:00:33	3700	3894	193	62	32.2 %	60			0			33			3.5			Left	1
89	Orbit	13:52:15	13:52:45	00:00:30	3894	4124	229	26	11.4 %	58.3			0			30			4.5			Left	0.9
90	Orbit	13:52:45	13:53:15	00:00:30	4124	4340	216	3	1.5 %	57.6			0			30			4.3			Left	0.9
91	Orbit	13:53:15	13:53:44	00:00:29	4340	4589	249	26	10.5 %	59.8			0			29			5.1			Left	0.9
92	Orbit	13:53:44	13:54:13	00:00:29	4589	4832	242	6	2.7 %	61.1			0			29			5			Left	0.9
93	Orbit	13:54:13	13:54:40	00:00:27	4832	5039	206	6	3.2 %	61.7			0			27			4.5			Left	0.9
15	Thermal	13:55:45	13:57:13	00:01:28	4842	5649	807	13	1.6 %	60.5 59.4	51.9 59.4	69.3 59.4	291 292	282 292	299 292	29.3 30	28 30	30 30	5.4 6	4.4 6	6 6	Left	2.7	3
94	Orbit	13:55:45	13:56:15	00:00:30	4842	5141	298	9	3.3 %	60.8			0			30			5.9			Left	0.9
95	Orbit	13:56:15	13:56:45	00:00:30	5141	5442	301	3	1.1 %	59.4			0			30			6			Left	0.9
96	Orbit	13:56:45	13:57:13	00:00:28	5442	5649	206	0	0 %	61.4			0			28			4.4			Left	0.9
16	Thermal	14:01:14	14:03:38	00:02:24	6131	7522	1391	72	5.2 %	63.6 64.3	53.6 62.1	76.3 66.7	250 273	133 251	305 305	24 26	13 23	30 30	5.9 5.5	4.9 4.9	7.6 6.3	Left	4.7	6
99	Orbit	14:01:14	14:01:41	00:00:27	6131	6394	262	0	0 %	62			0			27			5.8			Left	0.9
100	Orbit	14:01:41	14:02:11	00:00:30	6394	6643	249	49	19.7 %	62.1			0			30			4.9			Left	1
101	Orbit	14:02:11	14:02:34	00:00:23	6643	6889	246	13	5.3 %	66.7			0			23			6.3			Left	0.8
102	Orbit	14:02:34	14:02:58	00:00:24	6889	7125	236	6	2.8 %	65			0			24			5.8			Left	0.8
103	Orbit	14:02:58	14:03:25	00:00:27	7125	7355	229	3	1.4 %	63.5			0			27			5			Left	0.9
104	Orbit	14:03:25	14:03:38	00:00:13	7355	7522	167	0	0 %	62.5			0			13			7.6			Left	0.4
17	Thermal	14:07:21	14:08:37	00:01:16	7273	7811	538	85	15.9 %	65.7 60.7	53.5 60.7	79.7 60.7	264 358	118 358	358 358	25.3 36	10 36	36 36	3.7 4.5	2.1 4.5	4.5 4.5	Left	2.5	3
106	Orbit	14:07:21	14:07:51	00:00:30	7273	7500	226	16	7.2 %	64.2			0			30			4.5			Left	1
107	Orbit	14:07:51	14:08:27	00:00:36	7500	7775	275	52	19 %	60.7			0			36			4.5			Left	1.1
108	Orbit	14:08:27	14:08:37	00:00:10	7775	7811	36	16	45.5 %	72			0			10			2.1			Left	0.4
18	Thermal	14:15:42	14:20:17	00:04:35	5892	8166	2273	62	2.7 %	63.6 64	51.3 62.8	74.6 65.1	287 314	30 265	361 361	27.5 30	3 25	35 35	5.2 5	3.8 4	7.8 5.8	Left	9	10
109	Orbit	14:15:42	14:16:14	00:00:32	5892	6099	206	22	11.1 %	62.7			0			32			3.8			Left	1
110	Orbit	14:16:14	14:16:43	00:00:29	6099	6309	209	0	0 %	64			0			29			4.3			Left	1
111	Orbit	14:16:43	14:17:08	00:00:25	6309	6541	232	0	0 %	64.7			0			25			5.5			Left	0.8
112	Orbit	14:17:08	14:17:34	00:00:26	6541	6748	206	0	0 %	65.1			0			26			4.7			Left	0.9
113	Orbit	14:17:34	14:18:08	00:00:34	6748	7011	262	3	1.3 %	62.8			0			34			4.6			Left	1.1
114	Orbit	14:18:08	14:18:43	00:00:35	7011	7339	328	0	0 %	63			0			35			5.6			Left	1.1
115	Orbit	14:18:43	14:19:11	00:00:28	7339	7614	275	0	0 %	64.6			0			28			5.8			Left	0.9
116	Orbit	14:19:11	14:19:39	00:00:28	7614	7890	275	9	3.6 %	64.6			0			28			5.8			Left	0.9
117	Orbit	14:19:39	14:20:14	00:00:35	7890	8126	236	26	11.1 %	62.8			0			35			4			Left	1.1
118	Orbit	14:20:14	14:20:17	00:00:03	8126	8166	39	0	0 %	61.3			0			03			7.8			Left	0.1
19	Thermal	14:28:58	14:30:51	00:01:53	6502	7319	816	39	4.8 %	63.6 63.9	51.9 63.5	71.9 64.3	294 267	260 260	328 274	28.3 25.5	25 25	31 26	4.3 4.4	3.1 3.5	5.4 5.2	Right	3.7	4
121	Orbit	14:28:58	14:29:29	00:00:31	6502	6784	282	16	5.8 %	61.7			0			31			5.4			Right	1
122	Orbit	14:29:29	14:29:55	00:00:26	6784	6938	154	0	0 %	64.3			0			26			3.5			Right	0.9
123	Orbit	14:29:55	14:30:20	00:00:25	6938	7158	219	0	0 %	63.5			0			25			5.2			Right	0.8
124	Orbit	14:30:20	14:30:51	00:00:31	7158	7319	160	22	14.3 %	64.7			0			31			3.1			Right	1
20	Thermal	14:36:35	14:37:54	00:01:19	6702	7270	567	16	2.9 %	65.4 62.4	50.4 62.1	77 62.8	202 256	37 254	258 257	19.8 25	3 25	26 25	3.4 3.7	0.6 3.1	5.8 4.3	Right	2.5	4
125	Orbit	14:36:35	14:37:01	00:00:26	6702	6955	252	6	2.6 %	60.6			0			26			5.8			Right	0.8
126	Orbit	14:37:01	14:37:26	00:00:25	6955	7135	180	0	0 %	62.1			0			25			4.3			Right	0.8
127	Orbit	14:37:26	14:37:51	00:00:25	7135	7267	131	9	7.5 %	62.8			0			25			3.1			Right	0.8
128	Orbit	14:37:51	14:37:54	00:00:03	7267	7270	3	0	0 %	76.1			0			03			0.6			Right	0.1
21	Thermal	14:45:29	14:47:05	00:01:36	5803	6564	761	42	5.6 %	61.7 63	50.7 62.2	75.7 63.8	248 314	28 303	336 326	24 30.5	3 29	32 32	4.7 5.4	3.5 4.7	6 6	Left	3.1	4
129	Orbit	14:45:29	14:46:01	00:00:32	5803	5994	190	39	20.7 %	64.2			0			32			3.5			Left	1.1
130	Orbit	14:46:01	14:46:30	00:00:29	5994	6289	295	0	0 %	63.8			0			29			6			Left	1
131	Orbit	14:46:30	14:47:02	00:00:32	6289	6541	252	3	1.3 %	62.2			0			32			4.7			Left	1
132	Orbit	14:47:02	14:47:05	00:00:03	6541	6564	22	0	0 %	56.8			0			03			4.5			Left	0.1
22	Thermal	14:53:36	14:56:17	00:02:41	6456	7841	1384	9	0.7 %	62.4 62.9	47.3 62.5	74.3 63.6	325 289	104 276	654 302	32.2 28	10 27	67 29	5.3 5.2	4.4 4.4	6.1 6.1	Right	5.1	5
135	Orbit	14:53:36	14:54:43	00:00:00	6456	7007	551	9	1.8 %	59.6			1000			00			4.9			Right	2.1
136	Orbit	14:54:43	14:55:10	00:00:27	7007	7286	278	0	0 %	62.5			0			27			6.1			Right	0.9
137	Orbit	14:55:10	14:55:38	00:00:28	7286	7522	236	0	0 %	62.7			0			28			5			Right	0.9
138	Orbit	14:55:38	14:56:07	00:00:29	7522	7739	216	0	0 %	63.6			0			29			4.4			Right	0.9
139	Orbit	14:56:07	14:56:17	00:00:10	7739	7841	101	0	0 %	63.6			0			10			6			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 (FNC)

Glider FNC Thermal Info (Practice 3-20m multi-seat)

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