Validation of sea ice concentration
Bulletin date: 2025-05-01
Model vs. observations, sea ice class contingency tables
Date: 2025-04-25:
| 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 |
54261 |
22041 |
4770 |
926 |
314 |
101 |
0 |
0 |
| OW |
0 |
192 |
1588 |
875 |
640 |
509 |
99 |
0 |
| VODI |
0 |
8 |
700 |
776 |
606 |
995 |
762 |
20 |
| ODI |
0 |
0 |
136 |
357 |
344 |
967 |
2249 |
107 |
| CDI |
0 |
0 |
26 |
198 |
254 |
1156 |
11266 |
793 |
| VCDI |
0 |
0 |
2 |
19 |
86 |
760 |
23057 |
26884 |
|
...date precedes bulletin
|
Date: 2025-04-29:
| 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 |
54200 |
22425 |
4887 |
1001 |
319 |
71 |
4 |
2 |
| OW |
0 |
112 |
1529 |
1001 |
746 |
248 |
84 |
19 |
| VODI |
0 |
0 |
490 |
998 |
1151 |
746 |
510 |
74 |
| ODI |
0 |
0 |
74 |
183 |
430 |
1003 |
1713 |
290 |
| CDI |
0 |
0 |
9 |
114 |
171 |
1120 |
10273 |
1563 |
| VCDI |
0 |
0 |
0 |
56 |
48 |
209 |
20856 |
29246 |
|
...date precedes bulletin
|
Date: 2025-05-01:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
Date: 2025-05-05:
| 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 |
54881 |
23531 |
3766 |
673 |
74 |
17 |
4 |
0 |
| OW |
88 |
276 |
2297 |
1326 |
698 |
161 |
66 |
0 |
| VODI |
18 |
70 |
1018 |
1179 |
1357 |
932 |
447 |
4 |
| ODI |
3 |
5 |
195 |
581 |
864 |
1773 |
2950 |
42 |
| CDI |
0 |
2 |
44 |
343 |
447 |
953 |
16445 |
824 |
| VCDI |
0 |
0 |
1 |
147 |
114 |
178 |
22143 |
17907 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
54844 |
23273 |
3123 |
732 |
175 |
37 |
8 |
0 |
| OW |
95 |
484 |
2109 |
1116 |
738 |
337 |
67 |
0 |
| VODI |
27 |
109 |
1319 |
946 |
1085 |
930 |
644 |
4 |
| ODI |
19 |
16 |
600 |
646 |
736 |
1277 |
3488 |
37 |
| CDI |
5 |
2 |
162 |
621 |
654 |
1101 |
14013 |
1395 |
| VCDI |
0 |
0 |
8 |
188 |
166 |
332 |
23835 |
17341 |
|
Date: 2025-05-07:
| 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 |
55264 |
23943 |
3673 |
421 |
93 |
28 |
39 |
0 |
| OW |
88 |
378 |
2418 |
1417 |
569 |
211 |
160 |
0 |
| VODI |
8 |
44 |
1060 |
1476 |
1065 |
821 |
943 |
10 |
| ODI |
2 |
2 |
151 |
818 |
958 |
1459 |
3463 |
77 |
| CDI |
0 |
2 |
64 |
530 |
645 |
846 |
16706 |
726 |
| VCDI |
0 |
0 |
4 |
111 |
200 |
180 |
21256 |
16515 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
55214 |
23376 |
2656 |
543 |
197 |
60 |
45 |
0 |
| OW |
106 |
857 |
2283 |
1051 |
499 |
323 |
238 |
1 |
| VODI |
28 |
132 |
1443 |
1121 |
940 |
836 |
1022 |
25 |
| ODI |
10 |
2 |
675 |
902 |
799 |
1244 |
4172 |
99 |
| CDI |
4 |
2 |
306 |
965 |
763 |
698 |
14982 |
1117 |
| VCDI |
0 |
0 |
7 |
191 |
332 |
384 |
22108 |
16086 |
|
Date: 2025-05-09:
| 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 |
56497 |
24056 |
3224 |
283 |
131 |
44 |
15 |
0 |
| OW |
79 |
527 |
2824 |
932 |
489 |
250 |
197 |
0 |
| VODI |
12 |
36 |
1264 |
1716 |
989 |
719 |
897 |
3 |
| ODI |
0 |
2 |
425 |
930 |
1033 |
1188 |
3753 |
72 |
| CDI |
0 |
2 |
198 |
771 |
679 |
1158 |
16398 |
507 |
| VCDI |
0 |
0 |
80 |
272 |
303 |
350 |
19393 |
16146 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
56442 |
22694 |
2693 |
310 |
200 |
77 |
31 |
0 |
| OW |
110 |
1636 |
2276 |
651 |
312 |
249 |
236 |
0 |
| VODI |
26 |
283 |
1633 |
1439 |
840 |
634 |
1141 |
8 |
| ODI |
10 |
8 |
808 |
1205 |
1148 |
1220 |
4550 |
66 |
| CDI |
0 |
2 |
548 |
903 |
795 |
1078 |
14186 |
588 |
| VCDI |
0 |
0 |
57 |
396 |
329 |
451 |
20509 |
16066 |
|
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