Validation of sea ice concentration - American sector
Bulletin date: 2025-05-29
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-05-23:
| 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 |
8994 |
2864 |
84 |
127 |
14 |
4 |
0 |
0 |
| OW |
48 |
986 |
152 |
283 |
70 |
19 |
1 |
0 |
| VODI |
0 |
112 |
129 |
927 |
491 |
86 |
6 |
0 |
| ODI |
0 |
8 |
1 |
342 |
550 |
246 |
24 |
0 |
| CDI |
0 |
0 |
0 |
234 |
858 |
1745 |
393 |
129 |
| VCDI |
0 |
0 |
0 |
31 |
340 |
2622 |
14156 |
24155 |
|
...date precedes bulletin
|
Date: 2025-05-25:
| 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 |
9175 |
2896 |
86 |
121 |
22 |
3 |
0 |
0 |
| OW |
0 |
909 |
149 |
338 |
120 |
19 |
0 |
0 |
| VODI |
0 |
266 |
171 |
815 |
535 |
117 |
3 |
0 |
| ODI |
0 |
32 |
36 |
296 |
524 |
253 |
31 |
0 |
| CDI |
0 |
7 |
10 |
254 |
819 |
1705 |
424 |
13 |
| VCDI |
0 |
0 |
0 |
37 |
381 |
4157 |
16502 |
20005 |
|
...date precedes bulletin
|
Date: 2025-05-27:
| 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 |
9302 |
3215 |
64 |
109 |
14 |
4 |
0 |
0 |
| OW |
0 |
907 |
238 |
429 |
89 |
14 |
0 |
0 |
| VODI |
0 |
81 |
101 |
1065 |
533 |
50 |
0 |
0 |
| ODI |
0 |
18 |
4 |
222 |
761 |
140 |
19 |
0 |
| CDI |
0 |
17 |
3 |
151 |
1328 |
2026 |
541 |
18 |
| VCDI |
0 |
5 |
0 |
14 |
460 |
5958 |
18523 |
14808 |
|
...date precedes bulletin
|
Date: 2025-05-29:
| 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 |
9675 |
2879 |
89 |
87 |
12 |
5 |
1 |
0 |
| OW |
3 |
1138 |
139 |
330 |
129 |
6 |
0 |
0 |
| VODI |
1 |
306 |
178 |
803 |
519 |
69 |
11 |
0 |
| ODI |
0 |
22 |
14 |
275 |
727 |
173 |
49 |
0 |
| CDI |
0 |
10 |
4 |
236 |
1713 |
2326 |
1430 |
12 |
| VCDI |
0 |
3 |
0 |
132 |
1056 |
4018 |
18001 |
14650 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9671 |
2970 |
113 |
112 |
17 |
4 |
1 |
0 |
| OW |
7 |
1092 |
110 |
318 |
125 |
3 |
0 |
0 |
| VODI |
1 |
264 |
191 |
798 |
485 |
66 |
9 |
0 |
| ODI |
0 |
19 |
6 |
290 |
774 |
158 |
41 |
0 |
| CDI |
0 |
10 |
4 |
204 |
1672 |
2342 |
1491 |
16 |
| VCDI |
0 |
3 |
0 |
141 |
1083 |
4024 |
17950 |
14646 |
|
Date: 2025-05-31:
| 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 |
10087 |
2484 |
87 |
53 |
5 |
3 |
0 |
0 |
| OW |
7 |
1453 |
136 |
325 |
59 |
5 |
0 |
0 |
| VODI |
0 |
423 |
149 |
796 |
466 |
60 |
9 |
0 |
| ODI |
0 |
42 |
35 |
279 |
780 |
249 |
48 |
0 |
| CDI |
0 |
0 |
0 |
272 |
1340 |
3396 |
2450 |
74 |
| VCDI |
0 |
0 |
0 |
117 |
740 |
4560 |
14657 |
15585 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10075 |
2601 |
102 |
81 |
4 |
3 |
0 |
0 |
| OW |
19 |
1366 |
106 |
311 |
72 |
4 |
0 |
0 |
| VODI |
0 |
399 |
177 |
794 |
473 |
69 |
11 |
0 |
| ODI |
0 |
35 |
22 |
296 |
779 |
226 |
41 |
0 |
| CDI |
0 |
1 |
0 |
235 |
1320 |
3257 |
2321 |
75 |
| VCDI |
0 |
0 |
0 |
125 |
742 |
4714 |
14791 |
15584 |
|
Date: 2025-06-02:
| 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 |
10697 |
2548 |
95 |
82 |
6 |
4 |
0 |
0 |
| OW |
27 |
1464 |
216 |
387 |
49 |
7 |
0 |
0 |
| VODI |
0 |
62 |
29 |
1075 |
427 |
34 |
0 |
0 |
| ODI |
0 |
11 |
5 |
319 |
1408 |
160 |
11 |
8 |
| CDI |
0 |
0 |
0 |
97 |
1407 |
4472 |
450 |
19 |
| VCDI |
0 |
0 |
0 |
0 |
755 |
2511 |
15335 |
17054 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10663 |
2121 |
101 |
103 |
5 |
4 |
0 |
0 |
| OW |
46 |
1419 |
105 |
441 |
80 |
15 |
0 |
0 |
| VODI |
15 |
498 |
118 |
763 |
492 |
67 |
6 |
0 |
| ODI |
0 |
42 |
14 |
363 |
892 |
231 |
37 |
10 |
| CDI |
0 |
5 |
7 |
281 |
1645 |
2656 |
2779 |
38 |
| VCDI |
0 |
0 |
0 |
9 |
938 |
4215 |
12974 |
17033 |
|
Date: 2025-06-04:
| 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 |
10463 |
2960 |
92 |
101 |
11 |
8 |
0 |
0 |
| OW |
1 |
1384 |
211 |
433 |
60 |
20 |
0 |
0 |
| VODI |
0 |
221 |
105 |
990 |
438 |
88 |
0 |
0 |
| ODI |
0 |
6 |
8 |
519 |
1078 |
247 |
27 |
0 |
| CDI |
0 |
3 |
4 |
204 |
1587 |
4170 |
865 |
0 |
| VCDI |
0 |
0 |
0 |
17 |
459 |
4262 |
15312 |
14877 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10464 |
2340 |
81 |
119 |
10 |
8 |
0 |
0 |
| OW |
0 |
1643 |
138 |
392 |
110 |
24 |
0 |
0 |
| VODI |
0 |
553 |
168 |
789 |
439 |
111 |
0 |
0 |
| ODI |
0 |
30 |
24 |
547 |
769 |
220 |
18 |
0 |
| CDI |
0 |
6 |
5 |
363 |
1715 |
3221 |
1905 |
9 |
| VCDI |
0 |
2 |
4 |
54 |
590 |
5211 |
14281 |
14868 |
|
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 |
10495 |
3217 |
79 |
75 |
2 |
2 |
0 |
0 |
| OW |
0 |
1287 |
186 |
452 |
68 |
15 |
0 |
0 |
| VODI |
0 |
206 |
109 |
944 |
603 |
125 |
0 |
0 |
| ODI |
0 |
14 |
28 |
521 |
897 |
426 |
64 |
0 |
| CDI |
0 |
6 |
7 |
186 |
1662 |
4292 |
2003 |
7 |
| VCDI |
0 |
2 |
3 |
29 |
443 |
2344 |
15006 |
15426 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10495 |
2400 |
94 |
136 |
11 |
15 |
0 |
0 |
| OW |
0 |
1808 |
123 |
423 |
117 |
31 |
0 |
0 |
| VODI |
0 |
436 |
99 |
731 |
525 |
153 |
1 |
0 |
| ODI |
0 |
74 |
78 |
446 |
679 |
325 |
40 |
2 |
| CDI |
0 |
9 |
15 |
422 |
1534 |
3671 |
2717 |
26 |
| VCDI |
0 |
5 |
3 |
49 |
809 |
3009 |
14315 |
15405 |
|
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