Validation of sea ice concentration - American sector
Bulletin date: 2025-05-29
Data source: OSI SAF N.H. AMSR 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 |
0 |
299 |
11 |
11 |
2 |
0 |
0 |
0 |
| OW |
0 |
321 |
37 |
54 |
24 |
8 |
0 |
0 |
| VODI |
0 |
266 |
142 |
239 |
160 |
63 |
17 |
0 |
| ODI |
0 |
59 |
57 |
286 |
283 |
199 |
80 |
0 |
| CDI |
0 |
29 |
49 |
243 |
438 |
1381 |
848 |
24 |
| VCDI |
0 |
8 |
8 |
62 |
209 |
2696 |
24411 |
12842 |
|
...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 |
0 |
374 |
14 |
5 |
0 |
0 |
0 |
0 |
| OW |
0 |
308 |
50 |
82 |
31 |
16 |
3 |
0 |
| VODI |
0 |
356 |
136 |
246 |
181 |
99 |
36 |
0 |
| ODI |
0 |
94 |
76 |
211 |
300 |
209 |
93 |
0 |
| CDI |
0 |
63 |
64 |
251 |
391 |
1298 |
843 |
0 |
| VCDI |
0 |
21 |
12 |
82 |
292 |
5032 |
26260 |
8337 |
|
...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 |
0 |
372 |
11 |
8 |
0 |
0 |
0 |
0 |
| OW |
0 |
588 |
121 |
116 |
32 |
8 |
0 |
0 |
| VODI |
0 |
250 |
150 |
438 |
242 |
72 |
1 |
0 |
| ODI |
0 |
43 |
27 |
229 |
383 |
285 |
20 |
0 |
| CDI |
0 |
64 |
29 |
154 |
826 |
1755 |
774 |
0 |
| VCDI |
0 |
8 |
9 |
88 |
609 |
6906 |
23588 |
7660 |
|
...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 |
0 |
345 |
8 |
11 |
1 |
0 |
0 |
0 |
| OW |
0 |
686 |
96 |
129 |
45 |
8 |
0 |
0 |
| VODI |
0 |
404 |
136 |
314 |
267 |
77 |
2 |
0 |
| ODI |
0 |
77 |
58 |
214 |
415 |
251 |
26 |
0 |
| CDI |
0 |
48 |
37 |
214 |
1057 |
2607 |
1329 |
1 |
| VCDI |
0 |
24 |
23 |
162 |
1051 |
5326 |
23693 |
6724 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
409 |
18 |
21 |
0 |
0 |
0 |
0 |
| OW |
0 |
669 |
94 |
130 |
47 |
9 |
0 |
0 |
| VODI |
0 |
372 |
138 |
302 |
243 |
66 |
2 |
0 |
| ODI |
0 |
62 |
51 |
234 |
441 |
241 |
21 |
0 |
| CDI |
0 |
48 |
31 |
189 |
1046 |
2642 |
1380 |
2 |
| VCDI |
0 |
24 |
26 |
168 |
1059 |
5311 |
23647 |
6723 |
|
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 |
0 |
364 |
13 |
3 |
2 |
0 |
0 |
0 |
| OW |
0 |
798 |
103 |
136 |
37 |
3 |
0 |
0 |
| VODI |
0 |
438 |
110 |
330 |
299 |
67 |
2 |
0 |
| ODI |
0 |
103 |
65 |
236 |
496 |
235 |
45 |
0 |
| CDI |
0 |
51 |
53 |
294 |
836 |
3331 |
2542 |
5 |
| VCDI |
0 |
15 |
30 |
287 |
441 |
5055 |
22176 |
6865 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
446 |
19 |
8 |
2 |
0 |
0 |
0 |
| OW |
0 |
777 |
97 |
141 |
34 |
4 |
0 |
0 |
| VODI |
0 |
408 |
115 |
328 |
305 |
70 |
4 |
0 |
| ODI |
0 |
74 |
66 |
243 |
500 |
225 |
40 |
0 |
| CDI |
0 |
45 |
46 |
278 |
835 |
3174 |
2421 |
6 |
| VCDI |
0 |
19 |
31 |
288 |
435 |
5218 |
22300 |
6864 |
|
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 |
0 |
602 |
15 |
13 |
2 |
0 |
0 |
0 |
| OW |
0 |
890 |
129 |
129 |
30 |
1 |
1 |
0 |
| VODI |
0 |
352 |
142 |
532 |
288 |
69 |
3 |
0 |
| ODI |
0 |
124 |
56 |
382 |
803 |
345 |
39 |
0 |
| CDI |
0 |
38 |
34 |
152 |
537 |
3797 |
1494 |
0 |
| VCDI |
0 |
11 |
10 |
85 |
619 |
3104 |
21406 |
9632 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
436 |
9 |
8 |
6 |
0 |
0 |
0 |
| OW |
0 |
912 |
114 |
147 |
53 |
8 |
1 |
0 |
| VODI |
0 |
423 |
129 |
395 |
292 |
118 |
3 |
0 |
| ODI |
0 |
156 |
55 |
362 |
503 |
231 |
79 |
0 |
| CDI |
0 |
65 |
61 |
277 |
740 |
2801 |
3094 |
1 |
| VCDI |
0 |
25 |
18 |
104 |
685 |
4158 |
19766 |
9631 |
|
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 |
0 |
617 |
17 |
17 |
3 |
0 |
0 |
0 |
| OW |
0 |
922 |
140 |
175 |
30 |
8 |
0 |
0 |
| VODI |
0 |
329 |
160 |
659 |
404 |
55 |
7 |
0 |
| ODI |
0 |
59 |
66 |
452 |
742 |
315 |
30 |
0 |
| CDI |
0 |
69 |
49 |
229 |
1204 |
3749 |
1086 |
0 |
| VCDI |
0 |
8 |
10 |
45 |
418 |
4521 |
17432 |
11839 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
400 |
14 |
31 |
7 |
1 |
0 |
0 |
| OW |
0 |
970 |
104 |
203 |
76 |
14 |
0 |
0 |
| VODI |
0 |
423 |
148 |
505 |
364 |
72 |
6 |
0 |
| ODI |
0 |
102 |
98 |
384 |
539 |
252 |
30 |
0 |
| CDI |
0 |
80 |
56 |
376 |
1225 |
3218 |
1859 |
1 |
| VCDI |
0 |
29 |
22 |
78 |
590 |
5091 |
16660 |
11838 |
|
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 |
0 |
681 |
13 |
9 |
0 |
0 |
0 |
0 |
| OW |
0 |
980 |
156 |
221 |
14 |
10 |
0 |
0 |
| VODI |
0 |
346 |
172 |
653 |
461 |
86 |
9 |
0 |
| ODI |
0 |
89 |
73 |
437 |
661 |
368 |
69 |
0 |
| CDI |
0 |
64 |
41 |
305 |
1405 |
4079 |
1779 |
0 |
| VCDI |
0 |
16 |
15 |
40 |
373 |
2637 |
17838 |
11766 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
447 |
31 |
51 |
16 |
4 |
0 |
0 |
| OW |
0 |
950 |
125 |
242 |
85 |
32 |
1 |
0 |
| VODI |
0 |
461 |
106 |
476 |
389 |
90 |
11 |
0 |
| ODI |
0 |
204 |
106 |
292 |
485 |
260 |
70 |
0 |
| CDI |
0 |
80 |
75 |
508 |
1221 |
3773 |
2341 |
0 |
| VCDI |
0 |
34 |
27 |
96 |
718 |
3021 |
17272 |
11766 |
|
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