Validation of sea ice concentration - American sector
Bulletin date: 2025-11-20
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-11-14:
| 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 |
9148 |
2712 |
179 |
170 |
46 |
0 |
0 |
0 |
| OW |
0 |
533 |
96 |
239 |
127 |
5 |
0 |
0 |
| VODI |
0 |
255 |
106 |
307 |
280 |
150 |
0 |
0 |
| ODI |
0 |
26 |
21 |
103 |
220 |
374 |
11 |
0 |
| CDI |
0 |
12 |
22 |
31 |
109 |
871 |
191 |
0 |
| VCDI |
0 |
9 |
1 |
41 |
120 |
1750 |
12002 |
15599 |
|
...date precedes bulletin
|
Date: 2025-11-16:
| 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 |
9173 |
2323 |
117 |
76 |
3 |
0 |
0 |
0 |
| OW |
21 |
408 |
159 |
350 |
155 |
8 |
0 |
0 |
| VODI |
0 |
105 |
83 |
365 |
448 |
153 |
1 |
0 |
| ODI |
0 |
12 |
17 |
73 |
265 |
223 |
20 |
0 |
| CDI |
0 |
1 |
1 |
18 |
240 |
546 |
141 |
0 |
| VCDI |
0 |
0 |
0 |
6 |
232 |
1946 |
13094 |
15083 |
|
...date precedes bulletin
|
Date: 2025-11-18:
| 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 |
8666 |
2253 |
163 |
133 |
32 |
0 |
0 |
0 |
| OW |
0 |
332 |
137 |
291 |
133 |
4 |
0 |
0 |
| VODI |
0 |
83 |
61 |
283 |
613 |
77 |
0 |
0 |
| ODI |
0 |
3 |
6 |
60 |
435 |
276 |
11 |
0 |
| CDI |
0 |
0 |
0 |
12 |
297 |
771 |
72 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
170 |
2285 |
11782 |
16425 |
|
...date precedes bulletin
|
Date: 2025-11-20:
| 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 |
8554 |
2148 |
96 |
87 |
20 |
0 |
0 |
0 |
| OW |
0 |
372 |
107 |
212 |
59 |
8 |
0 |
0 |
| VODI |
0 |
281 |
91 |
329 |
358 |
76 |
0 |
0 |
| ODI |
0 |
60 |
41 |
159 |
365 |
233 |
19 |
0 |
| CDI |
0 |
11 |
14 |
77 |
315 |
598 |
77 |
0 |
| VCDI |
0 |
1 |
4 |
25 |
182 |
3079 |
13102 |
14706 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8554 |
2168 |
110 |
107 |
15 |
0 |
0 |
0 |
| OW |
0 |
365 |
101 |
212 |
66 |
4 |
0 |
0 |
| VODI |
0 |
275 |
84 |
308 |
379 |
81 |
0 |
0 |
| ODI |
0 |
59 |
45 |
175 |
359 |
213 |
11 |
0 |
| CDI |
0 |
6 |
13 |
71 |
322 |
638 |
68 |
0 |
| VCDI |
0 |
0 |
0 |
16 |
158 |
3058 |
13119 |
14706 |
|
Date: 2025-11-22:
| 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 |
8484 |
1724 |
142 |
128 |
17 |
7 |
0 |
0 |
| OW |
0 |
283 |
76 |
244 |
78 |
23 |
5 |
0 |
| VODI |
0 |
192 |
75 |
250 |
447 |
119 |
7 |
0 |
| ODI |
0 |
72 |
64 |
133 |
383 |
288 |
26 |
0 |
| CDI |
0 |
2 |
9 |
87 |
351 |
613 |
72 |
0 |
| VCDI |
0 |
0 |
0 |
7 |
219 |
2842 |
13066 |
15331 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8484 |
1749 |
141 |
142 |
23 |
13 |
5 |
0 |
| OW |
0 |
278 |
88 |
252 |
81 |
8 |
5 |
0 |
| VODI |
0 |
181 |
80 |
244 |
429 |
112 |
7 |
0 |
| ODI |
0 |
64 |
47 |
137 |
396 |
319 |
8 |
0 |
| CDI |
0 |
1 |
10 |
65 |
337 |
662 |
47 |
0 |
| VCDI |
0 |
0 |
0 |
9 |
229 |
2778 |
13104 |
15331 |
|
Date: 2025-11-24:
| 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 |
8488 |
1418 |
93 |
90 |
59 |
21 |
0 |
0 |
| OW |
0 |
436 |
132 |
150 |
31 |
29 |
0 |
0 |
| VODI |
0 |
38 |
82 |
387 |
212 |
40 |
5 |
0 |
| ODI |
0 |
0 |
0 |
71 |
671 |
185 |
17 |
0 |
| CDI |
0 |
0 |
0 |
11 |
475 |
1060 |
112 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
148 |
2062 |
10088 |
19255 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8488 |
1383 |
126 |
140 |
85 |
75 |
5 |
0 |
| OW |
0 |
264 |
62 |
169 |
88 |
53 |
9 |
0 |
| VODI |
0 |
176 |
70 |
196 |
356 |
136 |
31 |
0 |
| ODI |
0 |
52 |
37 |
127 |
365 |
272 |
39 |
0 |
| CDI |
0 |
17 |
12 |
70 |
469 |
636 |
108 |
0 |
| VCDI |
0 |
0 |
0 |
7 |
233 |
2225 |
10030 |
19255 |
|
Date: 2025-11-26:
| 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 |
8492 |
1273 |
78 |
110 |
38 |
36 |
2 |
0 |
| OW |
0 |
388 |
120 |
147 |
62 |
17 |
9 |
0 |
| VODI |
0 |
129 |
118 |
310 |
260 |
24 |
20 |
0 |
| ODI |
0 |
7 |
20 |
146 |
410 |
106 |
28 |
0 |
| CDI |
0 |
3 |
6 |
46 |
321 |
701 |
154 |
0 |
| VCDI |
0 |
0 |
1 |
16 |
146 |
1811 |
11453 |
18858 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8492 |
1191 |
101 |
136 |
77 |
66 |
18 |
0 |
| OW |
0 |
296 |
78 |
158 |
135 |
8 |
24 |
0 |
| VODI |
0 |
192 |
108 |
258 |
315 |
57 |
45 |
0 |
| ODI |
0 |
79 |
29 |
139 |
293 |
237 |
51 |
0 |
| CDI |
0 |
42 |
25 |
63 |
267 |
572 |
213 |
0 |
| VCDI |
0 |
0 |
2 |
21 |
150 |
1755 |
11315 |
18858 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8289 |
1022 |
99 |
136 |
90 |
12 |
0 |
0 |
| OW |
15 |
298 |
74 |
160 |
139 |
90 |
2 |
0 |
| VODI |
0 |
303 |
72 |
223 |
251 |
197 |
11 |
0 |
| ODI |
0 |
83 |
32 |
134 |
280 |
240 |
25 |
0 |
| CDI |
0 |
48 |
30 |
79 |
243 |
499 |
110 |
0 |
| VCDI |
0 |
7 |
8 |
48 |
223 |
2405 |
14447 |
15442 |
|
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