Validation of sea ice concentration - American sector
Bulletin date: 2025-04-24
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-04-18:
| 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 |
4940 |
2739 |
33 |
69 |
24 |
1 |
0 |
0 |
| OW |
0 |
498 |
92 |
211 |
132 |
8 |
0 |
0 |
| VODI |
0 |
19 |
25 |
343 |
584 |
107 |
15 |
0 |
| ODI |
0 |
0 |
0 |
84 |
684 |
410 |
48 |
0 |
| CDI |
0 |
0 |
0 |
25 |
598 |
1839 |
469 |
6 |
| VCDI |
0 |
0 |
0 |
15 |
464 |
3009 |
13615 |
30125 |
|
...date precedes bulletin
|
Date: 2025-04-20:
| 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 |
5367 |
2592 |
24 |
84 |
21 |
0 |
0 |
0 |
| OW |
0 |
537 |
60 |
212 |
111 |
5 |
0 |
0 |
| VODI |
0 |
34 |
36 |
452 |
441 |
66 |
4 |
0 |
| ODI |
0 |
1 |
1 |
146 |
715 |
333 |
78 |
10 |
| CDI |
0 |
0 |
0 |
54 |
671 |
1491 |
570 |
66 |
| VCDI |
0 |
0 |
0 |
7 |
592 |
2956 |
15123 |
28371 |
|
...date precedes bulletin
|
Date: 2025-04-22:
| 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 |
5428 |
2906 |
52 |
78 |
16 |
0 |
0 |
0 |
| OW |
0 |
162 |
107 |
318 |
55 |
0 |
0 |
0 |
| VODI |
0 |
18 |
26 |
557 |
551 |
89 |
1 |
0 |
| ODI |
0 |
0 |
0 |
135 |
952 |
453 |
48 |
2 |
| CDI |
0 |
0 |
0 |
36 |
726 |
2296 |
820 |
63 |
| VCDI |
0 |
0 |
0 |
0 |
264 |
1564 |
12968 |
30540 |
|
...date precedes bulletin
|
Date: 2025-04-24:
| 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 |
5403 |
2844 |
39 |
85 |
6 |
0 |
0 |
0 |
| OW |
0 |
227 |
128 |
441 |
84 |
5 |
0 |
0 |
| VODI |
0 |
33 |
29 |
526 |
615 |
150 |
3 |
2 |
| ODI |
0 |
2 |
2 |
140 |
1114 |
709 |
128 |
20 |
| CDI |
0 |
0 |
1 |
42 |
535 |
1569 |
1073 |
86 |
| VCDI |
0 |
0 |
0 |
12 |
266 |
1239 |
14528 |
29145 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5403 |
2844 |
43 |
95 |
11 |
0 |
0 |
0 |
| OW |
0 |
210 |
116 |
427 |
89 |
5 |
0 |
0 |
| VODI |
0 |
50 |
37 |
529 |
561 |
145 |
6 |
3 |
| ODI |
0 |
2 |
2 |
133 |
1146 |
694 |
135 |
23 |
| CDI |
0 |
0 |
1 |
46 |
551 |
1585 |
1180 |
90 |
| VCDI |
0 |
0 |
0 |
16 |
262 |
1243 |
14411 |
29137 |
|
Date: 2025-04-26:
| 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 |
5708 |
2674 |
13 |
4 |
2 |
0 |
0 |
0 |
| OW |
0 |
358 |
134 |
524 |
68 |
8 |
0 |
0 |
| VODI |
0 |
100 |
55 |
441 |
675 |
168 |
17 |
0 |
| ODI |
0 |
29 |
25 |
324 |
1009 |
806 |
142 |
10 |
| CDI |
0 |
9 |
6 |
120 |
589 |
1146 |
1079 |
104 |
| VCDI |
0 |
0 |
0 |
47 |
318 |
1152 |
14544 |
28823 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5708 |
2689 |
29 |
20 |
3 |
0 |
0 |
0 |
| OW |
0 |
317 |
119 |
486 |
75 |
5 |
0 |
0 |
| VODI |
0 |
133 |
50 |
457 |
627 |
161 |
25 |
0 |
| ODI |
0 |
22 |
29 |
325 |
1051 |
760 |
165 |
30 |
| CDI |
0 |
9 |
5 |
116 |
595 |
1162 |
1179 |
98 |
| VCDI |
0 |
0 |
1 |
56 |
310 |
1192 |
14413 |
28809 |
|
Date: 2025-04-28:
| 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 |
5785 |
2713 |
5 |
12 |
0 |
0 |
0 |
0 |
| OW |
0 |
479 |
236 |
216 |
15 |
0 |
0 |
0 |
| VODI |
0 |
16 |
36 |
1374 |
466 |
27 |
0 |
0 |
| ODI |
0 |
13 |
3 |
158 |
1611 |
269 |
22 |
0 |
| CDI |
0 |
26 |
0 |
64 |
384 |
1665 |
353 |
11 |
| VCDI |
0 |
0 |
0 |
3 |
235 |
1718 |
14690 |
28626 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5785 |
2565 |
27 |
32 |
11 |
0 |
0 |
0 |
| OW |
0 |
384 |
140 |
523 |
127 |
20 |
0 |
0 |
| VODI |
0 |
207 |
42 |
547 |
756 |
147 |
13 |
1 |
| ODI |
0 |
32 |
50 |
470 |
1001 |
720 |
141 |
22 |
| CDI |
0 |
10 |
2 |
155 |
387 |
1053 |
1185 |
122 |
| VCDI |
0 |
49 |
19 |
100 |
429 |
1739 |
13726 |
28492 |
|
Date: 2025-04-30:
| 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 |
5690 |
2670 |
10 |
33 |
0 |
0 |
0 |
0 |
| OW |
0 |
652 |
187 |
275 |
92 |
1 |
0 |
0 |
| VODI |
0 |
36 |
93 |
1496 |
628 |
48 |
0 |
0 |
| ODI |
0 |
8 |
4 |
135 |
1254 |
529 |
26 |
1 |
| CDI |
0 |
4 |
2 |
65 |
293 |
1150 |
545 |
76 |
| VCDI |
0 |
0 |
0 |
5 |
234 |
2167 |
14671 |
28151 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5690 |
2565 |
35 |
76 |
4 |
0 |
0 |
0 |
| OW |
0 |
484 |
111 |
589 |
181 |
31 |
4 |
0 |
| VODI |
0 |
291 |
98 |
677 |
791 |
186 |
48 |
0 |
| ODI |
0 |
26 |
28 |
437 |
886 |
702 |
122 |
7 |
| CDI |
0 |
4 |
4 |
169 |
371 |
1152 |
1258 |
68 |
| VCDI |
0 |
0 |
20 |
61 |
268 |
1824 |
13810 |
28153 |
|
Date: 2025-05-02:
| 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 |
5657 |
2410 |
21 |
30 |
7 |
0 |
0 |
0 |
| OW |
0 |
1014 |
146 |
316 |
78 |
0 |
0 |
0 |
| VODI |
0 |
75 |
144 |
1476 |
785 |
40 |
7 |
0 |
| ODI |
0 |
8 |
2 |
172 |
1256 |
498 |
62 |
1 |
| CDI |
0 |
6 |
0 |
55 |
363 |
887 |
491 |
84 |
| VCDI |
0 |
0 |
0 |
12 |
246 |
2044 |
14195 |
28643 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5657 |
2506 |
36 |
71 |
10 |
0 |
0 |
0 |
| OW |
0 |
623 |
139 |
625 |
176 |
3 |
0 |
0 |
| VODI |
0 |
354 |
105 |
789 |
961 |
152 |
40 |
0 |
| ODI |
0 |
27 |
29 |
380 |
882 |
439 |
126 |
14 |
| CDI |
0 |
3 |
4 |
153 |
406 |
1253 |
1482 |
154 |
| VCDI |
0 |
0 |
0 |
43 |
300 |
1622 |
13107 |
28560 |
|
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