Validation of sea ice concentration
Bulletin date: 2025-06-12
Model vs. observations, sea ice class contingency tables
Date: 2025-06-06:
| 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 |
70643 |
19644 |
4995 |
1122 |
151 |
34 |
116 |
0 |
| OW |
0 |
353 |
3294 |
3796 |
762 |
178 |
313 |
4 |
| VODI |
0 |
7 |
685 |
2489 |
3018 |
1703 |
1017 |
40 |
| ODI |
0 |
0 |
41 |
637 |
1376 |
3294 |
3509 |
109 |
| CDI |
0 |
0 |
0 |
155 |
284 |
955 |
14097 |
6503 |
| VCDI |
0 |
0 |
0 |
103 |
35 |
13 |
4425 |
8944 |
|
...date precedes bulletin
|
Date: 2025-06-10:
| 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 |
75641 |
18191 |
6058 |
716 |
336 |
79 |
134 |
2 |
| OW |
0 |
185 |
3972 |
1891 |
1009 |
298 |
355 |
19 |
| VODI |
0 |
1 |
862 |
1571 |
2564 |
2647 |
955 |
53 |
| ODI |
0 |
0 |
38 |
351 |
730 |
3256 |
4120 |
103 |
| CDI |
0 |
0 |
4 |
114 |
168 |
655 |
10958 |
939 |
| VCDI |
0 |
0 |
0 |
73 |
64 |
77 |
5999 |
13656 |
|
...date precedes bulletin
|
Date: 2025-06-12:
| 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 |
74215 |
20915 |
5023 |
1137 |
454 |
193 |
286 |
2 |
| OW |
0 |
821 |
2908 |
2088 |
903 |
562 |
509 |
20 |
| VODI |
0 |
12 |
711 |
1527 |
1993 |
2839 |
1466 |
69 |
| ODI |
0 |
0 |
43 |
269 |
814 |
2446 |
4280 |
113 |
| CDI |
0 |
0 |
9 |
102 |
117 |
907 |
10616 |
253 |
| VCDI |
0 |
0 |
0 |
18 |
70 |
81 |
5669 |
14384 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
74215 |
20979 |
5332 |
1278 |
465 |
196 |
305 |
3 |
| OW |
0 |
764 |
2632 |
2043 |
907 |
595 |
528 |
19 |
| VODI |
0 |
5 |
681 |
1384 |
1892 |
2698 |
1399 |
60 |
| ODI |
0 |
0 |
43 |
287 |
888 |
2497 |
4107 |
112 |
| CDI |
0 |
0 |
6 |
136 |
125 |
960 |
10998 |
241 |
| VCDI |
0 |
0 |
0 |
13 |
74 |
82 |
5489 |
14406 |
|
Date: 2025-06-16:
| 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 |
75966 |
19293 |
8269 |
816 |
122 |
57 |
262 |
8 |
| OW |
0 |
176 |
3261 |
2855 |
605 |
215 |
360 |
27 |
| VODI |
0 |
0 |
397 |
2142 |
2585 |
1915 |
1270 |
72 |
| ODI |
0 |
0 |
34 |
183 |
447 |
1659 |
5432 |
101 |
| CDI |
0 |
0 |
12 |
62 |
121 |
121 |
6967 |
293 |
| VCDI |
0 |
0 |
0 |
13 |
6 |
5 |
7941 |
14774 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
75966 |
19062 |
7087 |
804 |
123 |
66 |
278 |
4 |
| OW |
0 |
397 |
4108 |
2485 |
513 |
327 |
419 |
27 |
| VODI |
0 |
10 |
711 |
2346 |
2041 |
1471 |
1618 |
72 |
| ODI |
0 |
0 |
61 |
320 |
986 |
1628 |
5177 |
126 |
| CDI |
0 |
0 |
6 |
109 |
218 |
478 |
10772 |
895 |
| VCDI |
0 |
0 |
0 |
7 |
5 |
2 |
3968 |
14151 |
|
Date: 2025-06-18:
| 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 |
75475 |
20563 |
7880 |
1053 |
142 |
51 |
291 |
1 |
| OW |
0 |
479 |
2907 |
2915 |
608 |
338 |
465 |
21 |
| VODI |
0 |
69 |
842 |
2162 |
1805 |
1896 |
1804 |
103 |
| ODI |
0 |
0 |
72 |
442 |
549 |
1079 |
4505 |
130 |
| CDI |
0 |
0 |
24 |
143 |
220 |
323 |
7194 |
534 |
| VCDI |
0 |
0 |
0 |
2 |
4 |
10 |
7622 |
14121 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
75475 |
20232 |
7013 |
878 |
154 |
61 |
303 |
1 |
| OW |
0 |
839 |
3676 |
2564 |
543 |
368 |
482 |
20 |
| VODI |
0 |
40 |
836 |
2299 |
1550 |
1525 |
2091 |
97 |
| ODI |
0 |
0 |
190 |
739 |
720 |
1240 |
4673 |
141 |
| CDI |
0 |
0 |
10 |
203 |
354 |
488 |
9260 |
514 |
| VCDI |
0 |
0 |
0 |
34 |
7 |
15 |
5072 |
14137 |
|
Date: 2025-06-20:
| 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 |
75168 |
20266 |
8478 |
911 |
152 |
70 |
367 |
0 |
| OW |
0 |
384 |
3626 |
2704 |
786 |
359 |
501 |
0 |
| VODI |
0 |
6 |
794 |
2382 |
1744 |
2033 |
1777 |
0 |
| ODI |
0 |
0 |
82 |
271 |
494 |
1646 |
3933 |
0 |
| CDI |
0 |
0 |
165 |
242 |
340 |
535 |
6660 |
116 |
| VCDI |
0 |
0 |
44 |
132 |
106 |
67 |
10657 |
10846 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
75168 |
19939 |
7481 |
1031 |
155 |
89 |
304 |
0 |
| OW |
0 |
715 |
4193 |
2264 |
733 |
345 |
554 |
0 |
| VODI |
0 |
2 |
1159 |
2353 |
1521 |
1751 |
2154 |
0 |
| ODI |
0 |
0 |
169 |
580 |
664 |
1582 |
4504 |
0 |
| CDI |
0 |
0 |
141 |
373 |
486 |
827 |
8774 |
246 |
| VCDI |
0 |
0 |
46 |
41 |
63 |
116 |
7605 |
10716 |
|
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