Validation of sea ice concentration
Bulletin date: 2025-05-22
Model vs. observations, sea ice class contingency tables
Date: 2025-05-16:
| 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 |
58496 |
23079 |
2988 |
769 |
136 |
43 |
50 |
0 |
| OW |
69 |
982 |
2134 |
2324 |
502 |
345 |
114 |
0 |
| VODI |
2 |
184 |
885 |
2892 |
2836 |
2037 |
626 |
3 |
| ODI |
2 |
36 |
228 |
849 |
1474 |
3772 |
3102 |
44 |
| CDI |
1 |
5 |
83 |
768 |
587 |
3063 |
18265 |
1304 |
| VCDI |
0 |
0 |
0 |
17 |
17 |
66 |
9012 |
14653 |
|
...date precedes bulletin
|
Date: 2025-05-20:
| 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 |
57569 |
22126 |
4781 |
1229 |
312 |
81 |
31 |
0 |
| OW |
13 |
467 |
1770 |
3154 |
1583 |
394 |
204 |
0 |
| VODI |
2 |
7 |
690 |
2461 |
3887 |
3048 |
839 |
5 |
| ODI |
3 |
0 |
134 |
642 |
967 |
3572 |
6132 |
54 |
| CDI |
0 |
0 |
49 |
334 |
461 |
1148 |
17632 |
184 |
| VCDI |
0 |
0 |
0 |
37 |
16 |
15 |
7109 |
15702 |
|
...date precedes bulletin
|
Date: 2025-05-22:
| 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 |
57257 |
22191 |
5105 |
872 |
208 |
99 |
39 |
0 |
| OW |
10 |
281 |
2208 |
3730 |
1441 |
430 |
215 |
0 |
| VODI |
2 |
60 |
446 |
3014 |
3070 |
2444 |
1568 |
7 |
| ODI |
3 |
0 |
102 |
825 |
1403 |
2114 |
6921 |
55 |
| CDI |
0 |
0 |
8 |
354 |
542 |
1133 |
18475 |
191 |
| VCDI |
0 |
0 |
0 |
54 |
52 |
40 |
6160 |
15715 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
57251 |
22203 |
5092 |
944 |
224 |
104 |
46 |
0 |
| OW |
16 |
273 |
2219 |
3671 |
1297 |
356 |
202 |
0 |
| VODI |
2 |
56 |
450 |
3043 |
3199 |
2601 |
1692 |
10 |
| ODI |
3 |
0 |
100 |
780 |
1400 |
2096 |
6821 |
53 |
| CDI |
0 |
0 |
8 |
359 |
550 |
1073 |
18553 |
232 |
| VCDI |
0 |
0 |
0 |
52 |
46 |
30 |
6064 |
15673 |
|
Date: 2025-05-26:
| 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 |
61547 |
20760 |
4869 |
588 |
124 |
40 |
81 |
0 |
| OW |
5 |
187 |
3044 |
2905 |
1712 |
389 |
309 |
0 |
| VODI |
3 |
13 |
571 |
2325 |
3014 |
2654 |
1010 |
0 |
| ODI |
1 |
0 |
154 |
975 |
1373 |
5032 |
3647 |
2 |
| CDI |
0 |
0 |
32 |
374 |
524 |
2331 |
14809 |
79 |
| VCDI |
0 |
0 |
0 |
100 |
67 |
107 |
8008 |
15079 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
61547 |
20718 |
4480 |
504 |
102 |
27 |
52 |
0 |
| OW |
5 |
220 |
3295 |
2808 |
1663 |
329 |
262 |
0 |
| VODI |
4 |
22 |
676 |
2561 |
3098 |
2807 |
1081 |
0 |
| ODI |
0 |
0 |
191 |
931 |
1427 |
5074 |
3767 |
2 |
| CDI |
0 |
0 |
28 |
358 |
467 |
2222 |
14949 |
47 |
| VCDI |
0 |
0 |
0 |
105 |
57 |
94 |
7753 |
15111 |
|
Date: 2025-05-28:
| 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 |
63421 |
22149 |
4660 |
835 |
116 |
29 |
53 |
0 |
| OW |
4 |
70 |
2748 |
2782 |
1231 |
344 |
306 |
0 |
| VODI |
4 |
0 |
570 |
2583 |
3153 |
2043 |
884 |
0 |
| ODI |
0 |
0 |
86 |
638 |
1442 |
4277 |
3370 |
0 |
| CDI |
0 |
0 |
31 |
237 |
489 |
1657 |
15685 |
763 |
| VCDI |
0 |
0 |
0 |
82 |
55 |
77 |
8884 |
13086 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
63422 |
21765 |
2946 |
393 |
108 |
33 |
37 |
0 |
| OW |
3 |
390 |
3884 |
2747 |
1443 |
369 |
242 |
0 |
| VODI |
4 |
64 |
909 |
2640 |
2857 |
2243 |
1083 |
0 |
| ODI |
0 |
0 |
239 |
896 |
1466 |
4048 |
4323 |
0 |
| CDI |
0 |
0 |
117 |
372 |
521 |
1615 |
15196 |
236 |
| VCDI |
0 |
0 |
0 |
109 |
91 |
119 |
8301 |
13613 |
|
Date: 2025-05-30:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
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