Validation of sea ice concentration - Full domain
Bulletin date: 2025-10-23
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-10-17:
| 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 |
123913 |
13276 |
596 |
679 |
119 |
0 |
0 |
0 |
| OW |
359 |
1202 |
429 |
1582 |
380 |
34 |
0 |
0 |
| VODI |
102 |
131 |
93 |
1043 |
1370 |
240 |
0 |
0 |
| ODI |
1 |
36 |
27 |
267 |
1034 |
681 |
23 |
0 |
| CDI |
0 |
4 |
24 |
260 |
833 |
2469 |
1014 |
0 |
| VCDI |
1 |
0 |
0 |
1 |
212 |
12141 |
19193 |
10974 |
|
...date precedes bulletin
|
Date: 2025-10-19:
| 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 |
122524 |
13198 |
554 |
956 |
176 |
2 |
0 |
0 |
| OW |
79 |
1706 |
427 |
1200 |
654 |
40 |
0 |
0 |
| VODI |
18 |
395 |
167 |
1092 |
1266 |
419 |
0 |
0 |
| ODI |
0 |
43 |
39 |
257 |
1079 |
858 |
34 |
0 |
| CDI |
0 |
3 |
22 |
257 |
745 |
2213 |
651 |
0 |
| VCDI |
1 |
0 |
1 |
4 |
270 |
12710 |
18207 |
12476 |
|
...date precedes bulletin
|
Date: 2025-10-21:
| 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 |
121802 |
12591 |
868 |
930 |
212 |
2 |
0 |
0 |
| OW |
26 |
814 |
564 |
1478 |
407 |
18 |
0 |
0 |
| VODI |
16 |
59 |
43 |
1565 |
1119 |
168 |
0 |
0 |
| ODI |
2 |
2 |
1 |
362 |
1287 |
458 |
4 |
0 |
| CDI |
1 |
0 |
0 |
34 |
1411 |
3252 |
538 |
15 |
| VCDI |
1 |
0 |
0 |
0 |
74 |
11922 |
15959 |
16738 |
|
...date precedes bulletin
|
Date: 2025-10-23:
| 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 |
121292 |
10528 |
804 |
1427 |
114 |
41 |
0 |
0 |
| OW |
31 |
414 |
337 |
1663 |
758 |
239 |
0 |
0 |
| VODI |
16 |
75 |
66 |
1167 |
1324 |
480 |
4 |
0 |
| ODI |
0 |
0 |
8 |
322 |
1442 |
770 |
81 |
0 |
| CDI |
1 |
0 |
2 |
101 |
1301 |
2217 |
675 |
0 |
| VCDI |
1 |
0 |
0 |
3 |
191 |
10700 |
19141 |
17007 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
121317 |
10540 |
856 |
1588 |
322 |
88 |
0 |
0 |
| OW |
12 |
386 |
279 |
1501 |
574 |
252 |
0 |
0 |
| VODI |
10 |
90 |
68 |
1188 |
1366 |
507 |
7 |
0 |
| ODI |
0 |
1 |
14 |
286 |
1342 |
741 |
108 |
0 |
| CDI |
1 |
0 |
0 |
113 |
1292 |
2241 |
762 |
0 |
| VCDI |
1 |
0 |
0 |
7 |
234 |
10618 |
19024 |
17007 |
|
Date: 2025-10-25:
| 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 |
119718 |
10337 |
791 |
1416 |
130 |
1 |
0 |
0 |
| OW |
28 |
221 |
240 |
1449 |
779 |
72 |
0 |
0 |
| VODI |
15 |
32 |
40 |
950 |
1543 |
723 |
32 |
0 |
| ODI |
1 |
1 |
0 |
234 |
1431 |
968 |
140 |
0 |
| CDI |
0 |
0 |
0 |
45 |
1194 |
2423 |
603 |
0 |
| VCDI |
1 |
0 |
0 |
0 |
360 |
12129 |
23348 |
13348 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
119740 |
10329 |
799 |
1404 |
233 |
26 |
0 |
0 |
| OW |
11 |
229 |
234 |
1463 |
691 |
150 |
4 |
0 |
| VODI |
10 |
32 |
38 |
931 |
1532 |
736 |
36 |
0 |
| ODI |
1 |
1 |
0 |
233 |
1440 |
899 |
173 |
0 |
| CDI |
0 |
0 |
0 |
63 |
1147 |
2449 |
623 |
0 |
| VCDI |
1 |
0 |
0 |
0 |
394 |
12056 |
23287 |
13348 |
|
Date: 2025-10-27:
| 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 |
119691 |
9077 |
748 |
1170 |
53 |
0 |
0 |
0 |
| OW |
36 |
126 |
171 |
1742 |
324 |
0 |
0 |
0 |
| VODI |
19 |
5 |
6 |
1036 |
1875 |
78 |
2 |
0 |
| ODI |
3 |
1 |
1 |
63 |
1963 |
2061 |
246 |
0 |
| CDI |
0 |
0 |
0 |
5 |
672 |
2976 |
674 |
5 |
| VCDI |
1 |
0 |
0 |
0 |
87 |
9556 |
26088 |
14182 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
119692 |
8959 |
710 |
1519 |
267 |
14 |
0 |
0 |
| OW |
36 |
190 |
175 |
1345 |
737 |
47 |
2 |
0 |
| VODI |
18 |
49 |
34 |
840 |
1580 |
367 |
19 |
0 |
| ODI |
3 |
9 |
4 |
263 |
1284 |
1037 |
14 |
0 |
| CDI |
0 |
2 |
3 |
46 |
871 |
2590 |
412 |
0 |
| VCDI |
1 |
0 |
0 |
3 |
235 |
10616 |
26563 |
14187 |
|
Date: 2025-10-29:
| 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 |
118402 |
9409 |
487 |
853 |
138 |
0 |
0 |
0 |
| OW |
22 |
239 |
172 |
897 |
396 |
6 |
0 |
0 |
| VODI |
3 |
34 |
40 |
1121 |
1363 |
441 |
5 |
0 |
| ODI |
0 |
1 |
1 |
147 |
1635 |
1133 |
135 |
0 |
| CDI |
0 |
0 |
0 |
27 |
759 |
2430 |
791 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
134 |
9266 |
25391 |
18863 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
118388 |
9320 |
490 |
1171 |
387 |
19 |
0 |
0 |
| OW |
36 |
318 |
140 |
860 |
724 |
196 |
2 |
0 |
| VODI |
3 |
40 |
64 |
624 |
1393 |
757 |
78 |
0 |
| ODI |
0 |
4 |
5 |
300 |
835 |
1104 |
241 |
0 |
| CDI |
0 |
1 |
1 |
87 |
866 |
2195 |
1180 |
3 |
| VCDI |
0 |
0 |
0 |
5 |
220 |
9005 |
24821 |
18860 |
|
Date: 2025-10-31:
| 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 |
115949 |
11013 |
451 |
692 |
114 |
4 |
0 |
0 |
| OW |
67 |
513 |
273 |
969 |
191 |
26 |
0 |
0 |
| VODI |
3 |
35 |
67 |
1004 |
754 |
252 |
93 |
0 |
| ODI |
0 |
0 |
6 |
266 |
915 |
1230 |
343 |
0 |
| CDI |
0 |
0 |
0 |
70 |
925 |
1728 |
745 |
30 |
| VCDI |
0 |
0 |
0 |
0 |
122 |
7699 |
22686 |
25508 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
116015 |
10888 |
384 |
1055 |
117 |
15 |
21 |
0 |
| OW |
1 |
527 |
248 |
725 |
483 |
229 |
63 |
0 |
| VODI |
3 |
112 |
131 |
717 |
715 |
882 |
240 |
0 |
| ODI |
0 |
26 |
15 |
278 |
584 |
1019 |
403 |
6 |
| CDI |
0 |
8 |
19 |
208 |
832 |
1643 |
1152 |
64 |
| VCDI |
0 |
0 |
0 |
18 |
290 |
7151 |
21988 |
25468 |
|
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