Validation of sea ice concentration - American sector
Bulletin date: 2025-04-10
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-04-04:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
0 |
1 |
2 |
6 |
0 |
| ODI |
0 |
0 |
0 |
0 |
5 |
22 |
25 |
0 |
| CDI |
0 |
0 |
0 |
0 |
5 |
83 |
162 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
66 |
1155 |
11224 |
33110 |
|
...date precedes bulletin
|
Date: 2025-04-06:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
0 |
6 |
0 |
1 |
0 |
| ODI |
0 |
0 |
0 |
0 |
1 |
24 |
19 |
0 |
| CDI |
0 |
0 |
0 |
3 |
13 |
112 |
163 |
6 |
| VCDI |
0 |
0 |
0 |
11 |
172 |
1334 |
13550 |
30451 |
|
...date precedes bulletin
|
Date: 2025-04-08:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
| VODI |
0 |
1 |
2 |
21 |
8 |
12 |
0 |
0 |
| ODI |
0 |
3 |
4 |
25 |
26 |
18 |
8 |
0 |
| CDI |
0 |
4 |
5 |
22 |
63 |
171 |
184 |
6 |
| VCDI |
0 |
3 |
5 |
30 |
117 |
1308 |
11735 |
32084 |
|
...date precedes bulletin
|
Date: 2025-04-10:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
5 |
2 |
2 |
0 |
0 |
| VODI |
0 |
1 |
2 |
31 |
20 |
4 |
5 |
0 |
| ODI |
0 |
4 |
8 |
15 |
25 |
22 |
19 |
0 |
| CDI |
0 |
2 |
15 |
68 |
113 |
108 |
218 |
9 |
| VCDI |
0 |
5 |
4 |
109 |
227 |
1336 |
13286 |
30201 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
9 |
2 |
2 |
0 |
0 |
| VODI |
0 |
1 |
3 |
27 |
21 |
8 |
6 |
0 |
| ODI |
0 |
4 |
8 |
18 |
23 |
17 |
18 |
0 |
| CDI |
0 |
3 |
14 |
76 |
126 |
125 |
246 |
8 |
| VCDI |
0 |
4 |
4 |
98 |
215 |
1320 |
13258 |
30202 |
|
Date: 2025-04-12:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
1 |
1 |
0 |
0 |
0 |
| VODI |
0 |
12 |
1 |
20 |
5 |
4 |
3 |
0 |
| ODI |
0 |
18 |
7 |
13 |
20 |
23 |
19 |
0 |
| CDI |
0 |
57 |
23 |
92 |
108 |
229 |
355 |
4 |
| VCDI |
0 |
33 |
25 |
108 |
240 |
1315 |
15169 |
27961 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
1 |
1 |
0 |
0 |
0 |
| VODI |
0 |
9 |
0 |
20 |
5 |
4 |
3 |
0 |
| ODI |
0 |
21 |
8 |
13 |
20 |
32 |
18 |
1 |
| CDI |
0 |
68 |
28 |
103 |
107 |
227 |
376 |
15 |
| VCDI |
0 |
22 |
20 |
97 |
241 |
1308 |
15149 |
27949 |
|
Date: 2025-04-14:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
2 |
1 |
0 |
0 |
0 |
0 |
| VODI |
0 |
10 |
11 |
45 |
17 |
5 |
1 |
0 |
| ODI |
0 |
6 |
15 |
58 |
70 |
41 |
21 |
0 |
| CDI |
0 |
11 |
18 |
157 |
199 |
323 |
276 |
2 |
| VCDI |
0 |
0 |
0 |
39 |
204 |
1710 |
17577 |
25047 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
4 |
4 |
0 |
0 |
0 |
| VODI |
0 |
0 |
1 |
22 |
4 |
3 |
5 |
0 |
| ODI |
0 |
12 |
13 |
27 |
25 |
48 |
39 |
0 |
| CDI |
0 |
3 |
22 |
97 |
148 |
245 |
575 |
5 |
| VCDI |
0 |
12 |
10 |
150 |
309 |
1783 |
17256 |
25044 |
|
Date: 2025-04-16:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
2 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
13 |
14 |
0 |
0 |
0 |
| VODI |
0 |
5 |
8 |
32 |
49 |
13 |
3 |
0 |
| ODI |
0 |
0 |
3 |
23 |
60 |
78 |
34 |
0 |
| CDI |
0 |
0 |
0 |
50 |
223 |
416 |
395 |
0 |
| VCDI |
0 |
0 |
4 |
57 |
264 |
1674 |
14918 |
27528 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
7 |
11 |
0 |
0 |
0 |
| VODI |
0 |
4 |
5 |
29 |
25 |
7 |
12 |
0 |
| ODI |
0 |
1 |
4 |
12 |
57 |
62 |
83 |
1 |
| CDI |
0 |
0 |
2 |
47 |
107 |
304 |
579 |
17 |
| VCDI |
0 |
0 |
4 |
82 |
410 |
1808 |
14676 |
27510 |
|
Date: 2025-04-18:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
3 |
5 |
3 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
3 |
30 |
9 |
0 |
0 |
0 |
| VODI |
0 |
6 |
12 |
48 |
52 |
36 |
6 |
0 |
| ODI |
0 |
4 |
5 |
41 |
97 |
124 |
43 |
0 |
| CDI |
0 |
5 |
7 |
50 |
199 |
391 |
441 |
1 |
| VCDI |
0 |
1 |
10 |
70 |
409 |
1519 |
16947 |
25289 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
2 |
1 |
2 |
0 |
0 |
0 |
0 |
| OW |
0 |
1 |
12 |
33 |
4 |
0 |
0 |
0 |
| VODI |
0 |
8 |
7 |
50 |
25 |
12 |
6 |
0 |
| ODI |
0 |
1 |
4 |
44 |
86 |
82 |
44 |
0 |
| CDI |
0 |
4 |
5 |
45 |
162 |
363 |
462 |
5 |
| VCDI |
0 |
3 |
13 |
68 |
489 |
1613 |
16925 |
25285 |
|
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