Validation of sea ice concentration - American sector
Bulletin date: 2025-12-04
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-11-28:
| 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 |
8281 |
1082 |
82 |
116 |
31 |
0 |
0 |
0 |
| OW |
23 |
381 |
66 |
153 |
119 |
18 |
0 |
0 |
| VODI |
0 |
229 |
106 |
219 |
258 |
174 |
9 |
0 |
| ODI |
0 |
60 |
45 |
175 |
279 |
240 |
8 |
0 |
| CDI |
0 |
9 |
14 |
91 |
313 |
422 |
47 |
0 |
| VCDI |
0 |
0 |
2 |
26 |
226 |
2589 |
14531 |
15442 |
|
...date precedes bulletin
|
Date: 2025-11-30:
| 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 |
5685 |
2869 |
88 |
174 |
49 |
13 |
0 |
0 |
| OW |
73 |
239 |
122 |
227 |
183 |
76 |
0 |
0 |
| VODI |
2 |
158 |
91 |
218 |
308 |
388 |
12 |
0 |
| ODI |
0 |
73 |
42 |
103 |
208 |
344 |
24 |
0 |
| CDI |
0 |
7 |
19 |
96 |
186 |
585 |
113 |
6 |
| VCDI |
0 |
0 |
2 |
38 |
121 |
2521 |
14630 |
15773 |
|
...date precedes bulletin
|
Date: 2025-12-02:
| 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 |
3834 |
4175 |
103 |
120 |
24 |
0 |
0 |
0 |
| OW |
4 |
312 |
100 |
258 |
110 |
0 |
0 |
0 |
| VODI |
0 |
42 |
57 |
250 |
397 |
5 |
0 |
0 |
| ODI |
0 |
6 |
5 |
67 |
434 |
226 |
0 |
0 |
| CDI |
0 |
9 |
3 |
80 |
389 |
686 |
44 |
6 |
| VCDI |
0 |
0 |
1 |
10 |
141 |
2499 |
13760 |
17709 |
|
...date precedes bulletin
|
Date: 2025-12-04:
| 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 |
3277 |
4055 |
85 |
91 |
29 |
0 |
0 |
0 |
| OW |
44 |
406 |
88 |
187 |
87 |
10 |
0 |
0 |
| VODI |
0 |
135 |
65 |
186 |
320 |
80 |
0 |
0 |
| ODI |
0 |
17 |
23 |
94 |
458 |
240 |
0 |
0 |
| CDI |
0 |
3 |
13 |
81 |
339 |
532 |
2 |
0 |
| VCDI |
0 |
0 |
0 |
109 |
181 |
2017 |
16211 |
16401 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
3268 |
4120 |
92 |
102 |
31 |
0 |
0 |
0 |
| OW |
53 |
362 |
78 |
180 |
96 |
23 |
0 |
0 |
| VODI |
0 |
124 |
78 |
193 |
322 |
84 |
0 |
0 |
| ODI |
0 |
8 |
16 |
91 |
456 |
255 |
0 |
0 |
| CDI |
0 |
2 |
10 |
75 |
351 |
521 |
5 |
0 |
| VCDI |
0 |
0 |
0 |
107 |
158 |
1996 |
16208 |
16401 |
|
Date: 2025-12-06:
| 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 |
3006 |
3770 |
87 |
82 |
30 |
5 |
0 |
0 |
| OW |
69 |
514 |
70 |
131 |
86 |
5 |
0 |
0 |
| VODI |
1 |
261 |
75 |
190 |
173 |
93 |
0 |
0 |
| ODI |
0 |
49 |
17 |
109 |
279 |
164 |
2 |
0 |
| CDI |
0 |
22 |
14 |
84 |
451 |
526 |
37 |
0 |
| VCDI |
0 |
4 |
4 |
19 |
450 |
2026 |
12250 |
20711 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
2981 |
3844 |
90 |
90 |
35 |
5 |
0 |
0 |
| OW |
93 |
460 |
54 |
112 |
83 |
10 |
0 |
0 |
| VODI |
2 |
252 |
94 |
220 |
201 |
95 |
0 |
0 |
| ODI |
0 |
50 |
17 |
104 |
306 |
214 |
2 |
0 |
| CDI |
0 |
12 |
10 |
72 |
400 |
527 |
42 |
0 |
| VCDI |
0 |
2 |
2 |
17 |
444 |
1968 |
12245 |
20711 |
|
Date: 2025-12-08:
| 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 |
2961 |
3494 |
110 |
92 |
23 |
16 |
0 |
0 |
| OW |
185 |
417 |
47 |
109 |
59 |
5 |
0 |
0 |
| VODI |
25 |
249 |
82 |
120 |
161 |
50 |
0 |
0 |
| ODI |
0 |
92 |
42 |
131 |
294 |
121 |
12 |
0 |
| CDI |
0 |
19 |
5 |
38 |
291 |
287 |
62 |
3 |
| VCDI |
0 |
7 |
6 |
64 |
814 |
2768 |
7255 |
25350 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
2937 |
3153 |
100 |
88 |
30 |
18 |
0 |
0 |
| OW |
198 |
576 |
40 |
104 |
66 |
6 |
0 |
0 |
| VODI |
36 |
383 |
87 |
121 |
127 |
45 |
0 |
0 |
| ODI |
0 |
137 |
52 |
149 |
327 |
132 |
9 |
0 |
| CDI |
0 |
26 |
8 |
28 |
276 |
281 |
29 |
1 |
| VCDI |
0 |
3 |
5 |
64 |
816 |
2765 |
7291 |
25352 |
|
Date: 2025-12-10:
| 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 |
3204 |
3341 |
43 |
35 |
8 |
14 |
0 |
0 |
| OW |
164 |
443 |
57 |
92 |
44 |
16 |
0 |
0 |
| VODI |
13 |
159 |
81 |
148 |
124 |
37 |
0 |
0 |
| ODI |
0 |
24 |
23 |
139 |
222 |
117 |
1 |
0 |
| CDI |
0 |
7 |
4 |
32 |
218 |
515 |
90 |
0 |
| VCDI |
0 |
3 |
3 |
15 |
292 |
2613 |
12084 |
21441 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
3152 |
2557 |
45 |
62 |
43 |
20 |
0 |
0 |
| OW |
170 |
601 |
20 |
54 |
74 |
11 |
0 |
0 |
| VODI |
42 |
506 |
57 |
79 |
86 |
27 |
0 |
0 |
| ODI |
17 |
272 |
61 |
175 |
179 |
169 |
6 |
0 |
| CDI |
0 |
37 |
22 |
61 |
176 |
378 |
54 |
11 |
| VCDI |
0 |
4 |
6 |
30 |
350 |
2707 |
12115 |
21430 |
|
Date: 2025-12-12:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
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