Validation of sea ice concentration - Full domain
Bulletin date: 2025-11-27
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-11-21:
| 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 |
104752 |
11064 |
325 |
269 |
13 |
0 |
0 |
0 |
| OW |
117 |
1541 |
303 |
668 |
106 |
0 |
0 |
0 |
| VODI |
8 |
603 |
245 |
1182 |
583 |
48 |
0 |
0 |
| ODI |
1 |
95 |
49 |
580 |
917 |
305 |
3 |
0 |
| CDI |
9 |
11 |
1 |
258 |
1395 |
1358 |
128 |
6 |
| VCDI |
10 |
13 |
0 |
100 |
584 |
6200 |
23386 |
37507 |
|
...date precedes bulletin
|
Date: 2025-11-23:
| 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 |
104392 |
10336 |
315 |
473 |
42 |
1 |
0 |
0 |
| OW |
187 |
1046 |
218 |
633 |
137 |
10 |
0 |
0 |
| VODI |
73 |
984 |
252 |
922 |
522 |
160 |
0 |
0 |
| ODI |
24 |
112 |
62 |
673 |
818 |
476 |
13 |
0 |
| CDI |
20 |
17 |
2 |
249 |
1189 |
1506 |
152 |
26 |
| VCDI |
11 |
9 |
3 |
117 |
454 |
5340 |
20703 |
42064 |
|
...date precedes bulletin
|
Date: 2025-11-25:
| 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 |
101783 |
12116 |
426 |
572 |
61 |
3 |
0 |
0 |
| OW |
57 |
1044 |
384 |
985 |
120 |
19 |
0 |
0 |
| VODI |
3 |
413 |
261 |
1568 |
402 |
33 |
0 |
0 |
| ODI |
0 |
17 |
34 |
553 |
960 |
148 |
7 |
0 |
| CDI |
0 |
0 |
1 |
193 |
1319 |
1547 |
115 |
23 |
| VCDI |
0 |
1 |
1 |
34 |
510 |
5182 |
19430 |
44418 |
|
...date precedes bulletin
|
Date: 2025-11-27:
| 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 |
100899 |
12031 |
399 |
463 |
46 |
0 |
0 |
0 |
| OW |
54 |
1283 |
338 |
891 |
169 |
32 |
0 |
0 |
| VODI |
4 |
500 |
259 |
1402 |
653 |
77 |
0 |
0 |
| ODI |
0 |
30 |
55 |
754 |
987 |
161 |
17 |
0 |
| CDI |
0 |
1 |
6 |
256 |
1212 |
1076 |
93 |
29 |
| VCDI |
0 |
0 |
0 |
50 |
652 |
5505 |
20320 |
44039 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
100896 |
12084 |
433 |
481 |
49 |
0 |
0 |
0 |
| OW |
56 |
1242 |
302 |
874 |
154 |
36 |
0 |
0 |
| VODI |
5 |
490 |
266 |
1426 |
651 |
82 |
1 |
0 |
| ODI |
0 |
28 |
46 |
722 |
1041 |
160 |
24 |
0 |
| CDI |
0 |
0 |
10 |
256 |
1169 |
1132 |
85 |
29 |
| VCDI |
0 |
1 |
0 |
57 |
655 |
5441 |
20320 |
44039 |
|
Date: 2025-11-29:
| 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 |
99578 |
12493 |
406 |
516 |
65 |
4 |
0 |
0 |
| OW |
235 |
1316 |
287 |
896 |
318 |
32 |
0 |
0 |
| VODI |
27 |
769 |
267 |
1011 |
635 |
294 |
0 |
0 |
| ODI |
0 |
243 |
82 |
668 |
641 |
323 |
9 |
0 |
| CDI |
0 |
66 |
54 |
394 |
1204 |
865 |
82 |
14 |
| VCDI |
0 |
8 |
15 |
320 |
996 |
7527 |
23693 |
38390 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
99584 |
12625 |
434 |
573 |
101 |
4 |
0 |
0 |
| OW |
215 |
1220 |
272 |
830 |
279 |
37 |
0 |
0 |
| VODI |
41 |
732 |
250 |
1064 |
647 |
284 |
0 |
0 |
| ODI |
0 |
246 |
82 |
612 |
676 |
347 |
13 |
0 |
| CDI |
0 |
65 |
58 |
410 |
1155 |
886 |
68 |
19 |
| VCDI |
0 |
7 |
15 |
316 |
1001 |
7487 |
23703 |
38385 |
|
Date: 2025-12-01:
| 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 |
96361 |
15008 |
423 |
427 |
7 |
0 |
0 |
0 |
| OW |
277 |
1597 |
388 |
1051 |
132 |
5 |
0 |
0 |
| VODI |
22 |
569 |
139 |
1253 |
528 |
36 |
0 |
0 |
| ODI |
0 |
84 |
27 |
422 |
1223 |
101 |
1 |
0 |
| CDI |
0 |
60 |
37 |
276 |
1398 |
1702 |
54 |
24 |
| VCDI |
1 |
99 |
48 |
222 |
508 |
8149 |
24781 |
37303 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
96222 |
14487 |
348 |
552 |
67 |
2 |
0 |
0 |
| OW |
362 |
1400 |
305 |
900 |
337 |
40 |
0 |
0 |
| VODI |
75 |
703 |
187 |
1016 |
933 |
285 |
0 |
0 |
| ODI |
1 |
377 |
95 |
516 |
767 |
361 |
3 |
0 |
| CDI |
0 |
226 |
25 |
262 |
927 |
1184 |
105 |
34 |
| VCDI |
1 |
224 |
102 |
405 |
765 |
8121 |
24728 |
37293 |
|
Date: 2025-12-03:
| 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 |
92893 |
16518 |
495 |
647 |
7 |
0 |
0 |
0 |
| OW |
48 |
1373 |
381 |
1195 |
181 |
0 |
0 |
0 |
| VODI |
15 |
300 |
241 |
1194 |
929 |
55 |
0 |
0 |
| ODI |
0 |
60 |
53 |
586 |
1197 |
184 |
1 |
0 |
| CDI |
0 |
51 |
15 |
413 |
1368 |
1202 |
119 |
15 |
| VCDI |
0 |
4 |
4 |
279 |
969 |
5718 |
24472 |
41561 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
92882 |
15931 |
404 |
706 |
24 |
0 |
0 |
0 |
| OW |
56 |
1476 |
333 |
976 |
347 |
33 |
0 |
0 |
| VODI |
14 |
562 |
282 |
924 |
930 |
169 |
0 |
0 |
| ODI |
4 |
153 |
85 |
762 |
1091 |
341 |
9 |
1 |
| CDI |
0 |
130 |
70 |
603 |
1239 |
1042 |
181 |
34 |
| VCDI |
0 |
54 |
15 |
343 |
1020 |
5574 |
24402 |
41541 |
|
Date: 2025-12-05:
| 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 |
90211 |
16911 |
475 |
769 |
20 |
0 |
0 |
0 |
| OW |
71 |
1366 |
387 |
1131 |
326 |
119 |
0 |
0 |
| VODI |
2 |
262 |
184 |
1241 |
630 |
297 |
0 |
0 |
| ODI |
0 |
28 |
14 |
687 |
1136 |
332 |
4 |
0 |
| CDI |
0 |
13 |
0 |
284 |
1859 |
1374 |
136 |
6 |
| VCDI |
0 |
3 |
0 |
46 |
1286 |
5126 |
21630 |
46377 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
89907 |
16026 |
437 |
808 |
54 |
0 |
0 |
0 |
| OW |
363 |
1920 |
294 |
1016 |
318 |
116 |
0 |
0 |
| VODI |
14 |
537 |
261 |
1166 |
664 |
299 |
3 |
1 |
| ODI |
0 |
70 |
45 |
643 |
1028 |
583 |
9 |
11 |
| CDI |
0 |
23 |
20 |
368 |
1625 |
1148 |
100 |
109 |
| VCDI |
0 |
7 |
3 |
157 |
1568 |
5102 |
21658 |
46262 |
|
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