IGC Spy

Glider KM Thermal Info (Day7)

		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			00:51:48			18054	3612	20 %	65.5						24 00:00:24 blah			3.4					17
1	Thermal	03:18:15	03:22:56	00:04:41	3950	5400	1450	193	13.3 %	63.2 63.6	50.4 60.5	77.7 66.3	291 295	243 243	337 337	28.1 28.4	24 24	32 32	3 3.2	2.2 2.6	4.3 4.3	Right	9.1	10
1	Orbit	03:18:15	03:18:42	00:00:27	3950	4081	131	26	20 %	64.7			0			27			2.9			Right	0.9
2	Orbit	03:18:42	03:19:11	00:00:29	4081	4291	209	19	9.4 %	66.3			0			29			4.3			Right	1
3	Orbit	03:19:11	03:19:37	00:00:26	4291	4406	114	29	25.7 %	64.6			0			26			2.6			Right	0.9
4	Orbit	03:19:37	03:20:09	00:00:32	4406	4609	203	6	3.2 %	64.2			0			32			3.8			Right	1.1
5	Orbit	03:20:09	03:20:37	00:00:28	4609	4760	150	3	2.2 %	63.2			0			28			3.2			Right	0.9
6	Orbit	03:20:37	03:21:04	00:00:27	4760	4881	121	16	13.5 %	64.7			0			27			2.7			Right	0.9
7	Orbit	03:21:04	03:21:33	00:00:29	4881	5022	141	36	25.6 %	63.2			0			29			2.9			Right	0.9
8	Orbit	03:21:33	03:21:57	00:00:24	5022	5147	124	3	2.6 %	61.7			0			24			3.1			Right	0.8
9	Orbit	03:21:57	03:22:29	00:00:32	5147	5298	150	22	15.2 %	60.5			0			32			2.8			Right	1
10	Orbit	03:22:29	03:22:56	00:00:27	5298	5400	101	29	29 %	59.3			0			27			2.2			Right	0.8
2	Thermal	03:34:07	03:38:00	00:03:53	4317	6335	2017	19	1 %	68.4 69.6	51.3 63.8	91.7 80.6	236 232	201 201	261 250	21.2 20.4	18 18	26 22	5.2 5.5	3.2 3.2	6.8 6.8	Right	8.2	11
15	Orbit	03:34:07	03:34:30	00:00:23	4317	4445	127	6	5.1 %	64.5			0			23			3.3			Right	0.8
16	Orbit	03:34:30	03:34:49	00:00:19	4445	4606	160	0	0 %	64.8			0			19			5			Right	0.6
17	Orbit	03:34:49	03:35:10	00:00:21	4606	4822	216	0	0 %	63.8			0			21			6.1			Right	0.7
18	Orbit	03:35:10	03:35:32	00:00:22	4822	5042	219	0	0 %	67			0			22			5.9			Right	0.8
19	Orbit	03:35:32	03:35:53	00:00:21	5042	5262	219	0	0 %	67.3			0			21			6.2			Right	0.7
20	Orbit	03:35:53	03:36:12	00:00:19	5262	5429	167	0	0 %	70.8			0			19			5.2			Right	0.7
21	Orbit	03:36:12	03:36:32	00:00:20	5429	5538	108	0	0 %	76.4			0			20			3.2			Right	0.8
22	Orbit	03:36:32	03:36:50	00:00:18	5538	5734	196	0	0 %	80.6			0			18			6.5			Right	0.7
23	Orbit	03:36:50	03:37:12	00:00:22	5734	5987	252	0	0 %	68.8			0			22			6.8			Right	0.8
24	Orbit	03:37:12	03:37:34	00:00:22	5987	6171	183	3	1.8 %	66.7			0			22			4.9			Right	0.8
25	Orbit	03:37:34	03:38:00	00:00:26	6171	6335	164	9	6 %	61.4			0			26			3.7			Right	0.8
3	Thermal	03:46:42	03:48:39	00:01:57	5134	6446	1312	68	5.3 %	67.4 66.4	58.7 64.5	79.7 68.6	215 220	197 207	236 236	19.5 20.3	17 19	21 21	6.6 6.8	4.1 5.6	8.4 7.8	Right	4.1	6
27	Orbit	03:46:42	03:47:01	00:00:19	5134	5403	269	0	0 %	68.2			0			19			8.4			Right	0.7
28	Orbit	03:47:01	03:47:22	00:00:21	5403	5646	242	0	0 %	64.5			0			21			6.8			Right	0.7
29	Orbit	03:47:22	03:47:41	00:00:19	5646	5866	219	0	0 %	66.5			0			19			6.9			Right	0.7
30	Orbit	03:47:41	03:48:01	00:00:20	5866	6128	262	0	0 %	66			0			20			7.8			Right	0.7
31	Orbit	03:48:01	03:48:22	00:00:21	6128	6328	200	13	6.6 %	68.6			0			21			5.6			Right	0.7
32	Orbit	03:48:22	03:48:39	00:00:17	6328	6446	118	55	47.2 %	70.7			0			17			4.1			Right	0.6
4	Thermal	03:56:11	03:58:57	00:02:46	5518	7145	1627	39	2.4 %	62.8 62.4	52.9 60.7	73.1 65.7	213 223	177 203	253 253	20.8 21.8	17 19	25 25	5.9 5.2	4.7 4.7	8.7 5.9	Right	5.3	8
37	Orbit	03:56:11	03:56:29	00:00:18	5518	5784	265	9	3.7 %	64.2			0			18			8.7			Right	0.6
38	Orbit	03:56:29	03:56:50	00:00:21	5784	5951	167	6	3.9 %	62			0			21			4.7			Right	0.7
39	Orbit	03:56:50	03:57:11	00:00:21	5951	6118	167	6	3.9 %	61.9			0			21			4.7			Right	0.7
40	Orbit	03:57:11	03:57:31	00:00:20	6118	6292	173	13	7.5 %	61.9			0			20			5.2			Right	0.6
41	Orbit	03:57:31	03:57:56	00:00:25	6292	6532	239	0	0 %	60.7			0			25			5.7			Right	0.8
42	Orbit	03:57:56	03:58:15	00:00:19	6532	6722	190	3	1.7 %	65.7			0			19			5.9			Right	0.6
43	Orbit	03:58:15	03:58:40	00:00:25	6722	6929	206	0	0 %	61.9			0			25			4.9			Right	0.8
44	Orbit	03:58:40	03:58:57	00:00:17	6929	7145	216	0	0 %	63.7			0			17			7.5			Right	0.6
5	Thermal	04:06:55	04:09:13	00:02:18	6167	7326	1158	82	7.1 %	63.2 64	48.4 58.2	77.3 68.9	237 234	197 197	286 286	23 22.5	19 19	30 30	5.1 5.3	1.6 4.5	8 6.2	Right	4.5	6
46	Orbit	04:06:55	04:07:17	00:00:22	6167	6463	295	22	7.8 %	58.9			0			22			8			Right	0.7
47	Orbit	04:07:17	04:07:36	00:00:19	6463	6637	173	3	1.9 %	63.2			0			19			5.4			Right	0.6
48	Orbit	04:07:36	04:07:57	00:00:21	6637	6817	180	3	1.8 %	65.7			0			21			5.1			Right	0.7
49	Orbit	04:07:57	04:08:17	00:00:20	6817	7027	209	0	0 %	68.9			0			20			6.2			Right	0.7
50	Orbit	04:08:17	04:08:47	00:00:30	7027	7253	226	0	0 %	58.2			0			30			4.5			Right	0.9
51	Orbit	04:08:47	04:09:13	00:00:26	7253	7326	72	52	72.7 %	64.1			0			26			1.6			Right	0.9
6	Thermal	04:22:19	04:26:47	00:04:28	5390	7910	2519	75	3 %	65.9 66.7	46.8 62.7	80.2 71.3	222 226	166 201	247 247	20.6 20.7	18 18	23 23	5.6 5.5	4.6 4.6	6.2 6	Right	9.1	13
54	Orbit	04:22:19	04:22:41	00:00:22	5390	5603	213	3	1.5 %	66			0			22			5.7			Right	0.7
55	Orbit	04:22:41	04:23:03	00:00:22	5603	5826	223	0	0 %	65.1			0			22			6			Right	0.7
56	Orbit	04:23:03	04:23:25	00:00:22	5826	6023	196	0	0 %	67.4			0			22			5.3			Right	0.8
57	Orbit	04:23:25	04:23:47	00:00:22	6023	6233	209	0	0 %	68.7			0			22			5.7			Right	0.8
58	Orbit	04:23:47	04:24:08	00:00:21	6233	6410	177	16	9.3 %	68			0			21			5			Right	0.7
59	Orbit	04:24:08	04:24:26	00:00:18	6410	6591	180	3	1.8 %	68.3			0			18			5.9			Right	0.6
60	Orbit	04:24:26	04:24:44	00:00:18	6591	6755	164	0	0 %	71.3			0			18			5.4			Right	0.7
61	Orbit	04:24:44	04:25:04	00:00:20	6755	6952	196	0	0 %	65			0			20			5.8			Right	0.7
62	Orbit	04:25:04	04:25:24	00:00:20	6952	7148	196	0	0 %	67.1			0			20			5.8			Right	0.7
63	Orbit	04:25:24	04:25:44	00:00:20	7148	7303	154	6	4.3 %	66.3			0			20			4.6			Right	0.7
64	Orbit	04:25:44	04:26:07	00:00:23	7303	7532	229	9	4.3 %	64			0			23			5.9			Right	0.8
65	Orbit	04:26:07	04:26:29	00:00:22	7532	7723	190	36	19 %	62.7			0			22			5.1			Right	0.7
66	Orbit	04:26:29	04:26:47	00:00:18	7723	7910	187	0	0 %	56.2			0			18			6.2			Right	0.5
7	Thermal	04:30:49	04:33:03	00:02:14	7208	7759	551	216	39.3 %	61 59.9	48.4 59	78.2 61.2	267 275	244 253	290 290	26.8 28	25 26	30 30	2.4 3	-2.2 2.3	5.4 3.7	Right	4.2	5
67	Orbit	04:30:49	04:31:14	00:00:25	7208	7434	226	0	0 %	59.7			0			25			5.4			Right	0.8
68	Orbit	04:31:14	04:31:40	00:00:26	7434	7598	164	13	8 %	59.5			0			26			3.7			Right	0.8
69	Orbit	04:31:40	04:32:08	00:00:28	7598	7732	134	29	22 %	61.2			0			28			2.8			Right	0.9
70	Orbit	04:32:08	04:32:38	00:00:30	7732	7851	118	19	16.7 %	59			0			30			2.3			Right	0.9
71	Orbit	04:32:38	04:33:03	00:00:25	7851	7759	-91	154	-167.9 %	65.6			0			25			-2.2			Right	0.8
8	Thermal	04:37:52	04:40:08	00:02:16	6742	7634	892	157	17.6 %	62.6 63	48.1 61.6	76.3 64.2	278 247	231 231	352 272	27.2 24	22 22	36 27	4 4	3 3	5.8 5.8	Right	4.4	5
72	Orbit	04:37:52	04:38:20	00:00:28	6742	6935	193	68	35.6 %	63.9			0			28			4.1			Right	0.9
73	Orbit	04:38:20	04:38:43	00:00:23	6935	7050	114	22	20 %	63.4			0			23			3			Right	0.7
74	Orbit	04:38:43	04:39:05	00:00:22	7050	7267	216	0	0 %	64.2			0			22			5.8			Right	0.7
75	Orbit	04:39:05	04:39:32	00:00:27	7267	7417	150	9	6.5 %	61.6			0			27			3.3			Right	0.9
76	Orbit	04:39:32	04:40:08	00:00:36	7417	7634	216	55	25.8 %	59.8			0			36			3.6			Right	1.1
9	Thermal	04:49:54	04:54:37	00:04:43	5961	8031	2070	282	13.6 %	66.6 66.7	54.4 62.8	78.7 70.5	256 247	213 213	308 308	23.6 22.7	19 19	30 30	4.5 4.8	0.6 2.9	6.5 6.5	Right	9.7	12
77	Orbit	04:49:54	04:50:23	00:00:29	5961	6181	219	49	22.4 %	62.4			0			29			4.5			Right	0.9
78	Orbit	04:50:23	04:50:44	00:00:21	6181	6282	101	36	35.5 %	63.5			0			21			2.9			Right	0.7
79	Orbit	04:50:44	04:51:08	00:00:24	6282	6479	196	36	18.3 %	65.2			0			24			4.9			Right	0.8
80	Orbit	04:51:08	04:51:31	00:00:23	6479	6633	154	59	38.3 %	69.7			0			23			4			Right	0.8
81	Orbit	04:51:31	04:51:50	00:00:19	6633	6843	209	3	1.6 %	68.4			0			19			6.5			Right	0.7
82	Orbit	04:51:50	04:52:10	00:00:20	6843	7004	160	6	4.1 %	69.5			0			20			4.8			Right	0.7
83	Orbit	04:52:10	04:52:31	00:00:21	7004	7214	209	0	0 %	69.1			0			21			5.9			Right	0.7
84	Orbit	04:52:31	04:52:52	00:00:21	7214	7391	177	0	0 %	70.5			0			21			5			Right	0.8
85	Orbit	04:52:52	04:53:18	00:00:26	7391	7595	203	22	11.3 %	65.8			0			26			4.6			Right	0.9
86	Orbit	04:53:18	04:53:40	00:00:22	7595	7834	239	0	0 %	63			0			22			6.5			Right	0.7
87	Orbit	04:53:40	04:54:10	00:00:30	7834	8001	167	3	2 %	62.8			0			30			3.3			Right	1
88	Orbit	04:54:10	04:54:37	00:00:27	8001	8031	29	65	222.2 %	69.3			0			27			0.6			Right	1
10	Thermal	05:02:16	05:03:37	00:01:21	6000	5856	-144	374	0 %	67.1 67.1	43.6 65.6	89.7 68.6	446 446	397 397	494 494	40.5 40.5	37 37	44 44	-0.8 -0.8	-3.6 -3.6	1.9 1.9	Right	2.8	2
89	Orbit	05:02:16	05:02:53	00:00:37	6000	6122	121	72	59.5 %	65.6			0			37			1.9			Right	1.2
90	Orbit	05:02:53	05:03:37	00:00:44	6122	5856	-265	301	-113.6 %	68.6			0			44			-3.6			Right	1.6
11	Thermal	05:04:31	05:05:57	00:01:26	5859	6108	249	157	63.2 %	66.3 61.5	40.5 61.5	95.5 61.5	318 272	227 272	454 272	28.7 27	23 27	36 27	1.7 3.4	0.8 3.4	3.4 3.4	Right	3	3
91	Orbit	05:04:31	05:05:07	00:00:36	5859	5925	65	101	155 %	77			0			36			1.1			Right	1.4
92	Orbit	05:05:07	05:05:34	00:00:27	5925	6079	154	16	10.6 %	61.5			0			27			3.4			Right	0.9
93	Orbit	05:05:34	05:05:57	00:00:23	6079	6108	29	39	133.3 %	60.2			0			23			0.8			Right	0.7
12	Thermal	05:06:02	05:07:13	00:01:11	6079	6318	239	167	69.9 %	76.5 63.2	33.3 63.2	159.1 63.2	295 259	237 259	390 259	23.7 25	23 25	25 25	2 2.2	0.8 2.2	3 2.2	Right	2.8	3
94	Orbit	05:06:02	05:06:25	00:00:23	6079	6112	32	78	240 %	103.4			0			23			0.8			Right	1.2
95	Orbit	05:06:25	05:06:50	00:00:25	6112	6204	91	42	46.4 %	63.2			0			25			2.2			Right	0.8
96	Orbit	05:06:50	05:07:13	00:00:23	6204	6318	114	45	40 %	62.9			0			23			3			Right	0.7
13	Thermal	05:07:20	05:11:37	00:04:17	6371	7404	1033	538	52.1 %	66.4 64.5	46.9 61.2	112.9 72.2	275 275	213 213	390 390	25.7 26.3	18 18	38 38	2.5 3.3	-5 0.2	6 6	Right	8.6	10
97	Orbit	05:07:20	05:07:49	00:00:29	6371	6519	147	75	51.1 %	61.9			0			29			3			Right	0.9
98	Orbit	05:07:49	05:08:11	00:00:22	6519	6719	200	0	0 %	63.8			0			22			5.4			Right	0.7
99	Orbit	05:08:11	05:08:29	00:00:18	6719	6856	137	0	0 %	72.2			0			18			4.5			Right	0.7
100	Orbit	05:08:29	05:08:50	00:00:21	6856	7070	213	0	0 %	65.9			0			21			6			Right	0.7
101	Orbit	05:08:50	05:09:15	00:00:25	7070	7253	183	22	12.5 %	61.2			0			25			4.4			Right	0.8
102	Orbit	05:09:15	05:09:53	00:00:38	7253	7267	13	170	1300 %	62.7			0			38			0.2			Right	1.2
103	Orbit	05:09:53	05:10:20	00:00:27	7267	7372	104	22	21.9 %	64.6			0			27			2.3			Right	0.9
104	Orbit	05:10:20	05:10:45	00:00:25	7372	7490	118	36	30.6 %	64.1			0			25			2.8			Right	0.8
105	Orbit	05:10:45	05:11:19	00:00:34	7490	7555	65	59	90 %	61.4			0			34			1.1			Right	1.1
106	Orbit	05:11:19	05:11:37	00:00:18	7555	7404	-150	150	-100 %	85.7			0			18			-5			Right	0.8
14	Thermal	05:15:41	05:17:00	00:01:19	6469	6519	49	341	693.3 %	64.5 62.6	53 62.6	88.9 62.6	279 298	179 298	360 298	26.3 29	17 29	33 29	1 2.1	-3.1 2.1	4.1 2.1	Right	2.6	3
107	Orbit	05:15:41	05:15:58	00:00:17	6469	6587	118	13	11.1 %	64.3			0			17			4.1			Right	0.6
108	Orbit	05:15:58	05:16:27	00:00:29	6587	6692	104	68	65.6 %	62.6			0			29			2.1			Right	0.9
109	Orbit	05:16:27	05:17:00	00:00:33	6692	6519	-173	259	-149.1 %	66.6			0			33			-3.1			Right	1.1
15	Thermal	05:23:20	05:28:33	00:05:13	5036	6594	1558	226	14.5 %	64.5 63.9	52.8 61.2	77.9 67.7	254 252	222 222	291 283	24.1 24.1	20 21	28 27	2.9 3	2.1 2.2	4.2 4.2	Right	10.4	13
111	Orbit	05:23:20	05:23:48	00:00:28	5036	5203	167	22	13.7 %	63.5			0			28			3.5			Right	0.9
112	Orbit	05:23:48	05:24:13	00:00:25	5203	5314	111	32	29.4 %	61.2			0			25			2.6			Right	0.8
113	Orbit	05:24:13	05:24:34	00:00:21	5314	5462	147	6	4.4 %	64.7			0			21			4.2			Right	0.7
114	Orbit	05:24:34	05:25:00	00:00:26	5462	5593	131	49	37.5 %	63.2			0			26			3			Right	0.8
115	Orbit	05:25:00	05:25:24	00:00:24	5593	5725	131	16	12.5 %	64.1			0			24			3.2			Right	0.8
116	Orbit	05:25:24	05:25:46	00:00:22	5725	5849	124	0	0 %	62.8			0			22			3.4			Right	0.7
117	Orbit	05:25:46	05:26:12	00:00:26	5849	5944	95	3	3.4 %	61.4			0			26			2.2			Right	0.8
118	Orbit	05:26:12	05:26:39	00:00:27	5944	6089	144	19	13.6 %	64			0			27			3.2			Right	0.9
119	Orbit	05:26:39	05:27:02	00:00:23	6089	6210	121	13	10.8 %	64.1			0			23			3.1			Right	0.8
120	Orbit	05:27:02	05:27:26	00:00:24	6210	6305	95	3	3.4 %	65.2			0			24			2.3			Right	0.8
121	Orbit	05:27:26	05:27:50	00:00:24	6305	6417	111	9	8.8 %	64.5			0			24			2.8			Right	0.8
122	Orbit	05:27:50	05:28:13	00:00:23	6417	6522	104	19	18.8 %	67.7			0			23			2.7			Right	0.8
123	Orbit	05:28:13	05:28:33	00:00:20	6522	6594	72	29	40.9 %	72.5			0			20			2.1			Right	0.7
16	Thermal	05:37:03	05:40:46	00:03:43	4265	4632	367	354	96.4 %	65.1 64.3	48.4 62.2	86.9 67.8	298 286	247 247	392 319	27.9 27.2	24 24	33 29	1 1.2	-0.7 -0.7	2 2	Right	7.5	8
124	Orbit	05:37:03	05:37:30	00:00:27	4265	4333	68	29	42.9 %	62.6			0			27			1.5			Right	0.9
125	Orbit	05:37:30	05:37:58	00:00:28	4333	4422	88	9	11.1 %	62.2			0			28			1.9			Right	0.9
126	Orbit	05:37:58	05:38:22	00:00:24	4422	4504	82	13	16 %	62.9			0			24			2			Right	0.8
127	Orbit	05:38:22	05:38:50	00:00:28	4504	4560	55	29	52.9 %	63.1			0			28			1.2			Right	0.9
128	Orbit	05:38:50	05:39:16	00:00:26	4560	4619	59	29	50 %	62.7			0			26			1.3			Right	0.8
129	Orbit	05:39:16	05:39:44	00:00:28	4619	4681	62	42	68.4 %	67.8			0			28			1.3			Right	1
130	Orbit	05:39:44	05:40:13	00:00:29	4681	4648	-32	114	-350 %	67.2			0			29			-0.7			Right	1
131	Orbit	05:40:13	05:40:46	00:00:33	4648	4632	-16	85	-520 %	72.5			0			33			-0.3			Right	1.2
17	Thermal	05:46:10	05:50:12	00:04:02	3795	4898	1102	318	28.9 %	62.5 62.7	48.5 60.9	75.2 64.8	226 245	20 222	265 265	22 23.9	2 21	25 25	2.9 2.7	1.7 1.7	4.9 3.9	Right	7.8	11
133	Orbit	05:46:10	05:46:35	00:00:25	3795	3910	114	36	31.4 %	62.9			0			25			2.7			Right	0.8
134	Orbit	05:46:35	05:46:59	00:00:24	3910	3992	82	22	28 %	61.4			0			24			2			Right	0.8
135	Orbit	05:46:59	05:47:23	00:00:24	3992	4150	157	6	4.2 %	61.8			0			24			3.9			Right	0.8
136	Orbit	05:47:23	05:47:48	00:00:25	4150	4258	108	22	21.2 %	60.9			0			25			2.6			Right	0.8
137	Orbit	05:47:48	05:48:11	00:00:23	4258	4399	141	19	14 %	62.7			0			23			3.6			Right	0.7
138	Orbit	05:48:11	05:48:32	00:00:21	4399	4498	98	59	60 %	64.4			0			21			2.8			Right	0.7
139	Orbit	05:48:32	05:48:56	00:00:24	4498	4612	114	16	14.3 %	61.8			0			24			2.8			Right	0.8
140	Orbit	05:48:56	05:49:21	00:00:25	4612	4708	95	65	69 %	62			0			25			2.3			Right	0.8
141	Orbit	05:49:21	05:49:45	00:00:24	4708	4809	101	22	22.6 %	64.5			0			24			2.5			Right	0.8
142	Orbit	05:49:45	05:50:10	00:00:25	4809	4881	72	45	63.6 %	64.8			0			25			1.7			Right	0.8
143	Orbit	05:50:10	05:50:12	00:00:02	4881	4898	16	0	0 %	59.8			0			02			4.9			Right	0.1

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 (KM)

Glider KM Thermal Info (Day7)

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