Validation of sea ice concentration - American sector
Bulletin date: 2025-05-15
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
6227 |
2468 |
15 |
33 |
3 |
3 |
0 |
0 |
| OW |
0 |
1388 |
172 |
191 |
36 |
15 |
0 |
0 |
| VODI |
0 |
220 |
184 |
1314 |
626 |
43 |
7 |
6 |
| ODI |
0 |
17 |
9 |
162 |
1151 |
273 |
30 |
13 |
| CDI |
0 |
6 |
13 |
107 |
707 |
1172 |
238 |
71 |
| VCDI |
0 |
1 |
0 |
79 |
852 |
2551 |
10220 |
30608 |
|
...date precedes bulletin
|
Date: 2025-05-11:
| 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 |
6591 |
2323 |
29 |
37 |
0 |
0 |
0 |
0 |
| OW |
0 |
1572 |
149 |
229 |
45 |
0 |
0 |
0 |
| VODI |
0 |
321 |
202 |
1328 |
618 |
27 |
8 |
5 |
| ODI |
0 |
21 |
25 |
167 |
767 |
279 |
30 |
16 |
| CDI |
0 |
5 |
16 |
127 |
723 |
894 |
404 |
171 |
| VCDI |
0 |
0 |
2 |
60 |
376 |
3127 |
13033 |
27504 |
|
...date precedes bulletin
|
Date: 2025-05-13:
| 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 |
7040 |
2814 |
28 |
41 |
0 |
0 |
0 |
0 |
| OW |
0 |
1559 |
202 |
282 |
16 |
14 |
0 |
0 |
| VODI |
0 |
262 |
175 |
993 |
461 |
58 |
0 |
4 |
| ODI |
0 |
2 |
5 |
148 |
967 |
225 |
12 |
11 |
| CDI |
0 |
0 |
0 |
39 |
914 |
1416 |
244 |
70 |
| VCDI |
0 |
0 |
1 |
102 |
792 |
3538 |
17578 |
21218 |
|
...date precedes bulletin
|
Date: 2025-05-15:
| 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 |
7408 |
2692 |
89 |
55 |
5 |
0 |
0 |
0 |
| OW |
0 |
1763 |
202 |
290 |
40 |
2 |
1 |
0 |
| VODI |
0 |
209 |
146 |
804 |
598 |
26 |
18 |
2 |
| ODI |
0 |
1 |
3 |
162 |
770 |
144 |
70 |
8 |
| CDI |
0 |
0 |
0 |
75 |
876 |
1335 |
852 |
33 |
| VCDI |
0 |
0 |
0 |
18 |
190 |
2521 |
20474 |
19349 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7408 |
2574 |
93 |
76 |
2 |
0 |
0 |
0 |
| OW |
0 |
1809 |
200 |
292 |
47 |
0 |
2 |
0 |
| VODI |
0 |
281 |
145 |
780 |
540 |
35 |
20 |
2 |
| ODI |
0 |
1 |
2 |
167 |
781 |
161 |
67 |
8 |
| CDI |
0 |
0 |
0 |
71 |
842 |
1211 |
809 |
32 |
| VCDI |
0 |
0 |
0 |
18 |
267 |
2621 |
20517 |
19350 |
|
Date: 2025-05-17:
| 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 |
7527 |
2749 |
39 |
54 |
5 |
4 |
0 |
0 |
| OW |
0 |
1895 |
208 |
308 |
59 |
8 |
0 |
0 |
| VODI |
0 |
246 |
135 |
654 |
618 |
41 |
11 |
0 |
| ODI |
0 |
7 |
15 |
205 |
642 |
247 |
57 |
1 |
| CDI |
0 |
10 |
3 |
126 |
902 |
1078 |
834 |
36 |
| VCDI |
0 |
16 |
6 |
85 |
525 |
2568 |
17325 |
21982 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7527 |
2633 |
54 |
74 |
3 |
4 |
0 |
0 |
| OW |
0 |
1955 |
197 |
313 |
63 |
4 |
0 |
0 |
| VODI |
0 |
302 |
133 |
619 |
598 |
53 |
13 |
0 |
| ODI |
0 |
4 |
12 |
216 |
636 |
246 |
67 |
0 |
| CDI |
0 |
15 |
5 |
120 |
860 |
949 |
803 |
77 |
| VCDI |
0 |
14 |
5 |
90 |
591 |
2690 |
17344 |
21942 |
|
Date: 2025-05-19:
| 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 |
8018 |
3189 |
63 |
86 |
11 |
1 |
0 |
0 |
| OW |
6 |
1351 |
271 |
293 |
35 |
13 |
0 |
0 |
| VODI |
0 |
2 |
16 |
925 |
381 |
33 |
3 |
0 |
| ODI |
0 |
0 |
0 |
155 |
1023 |
147 |
36 |
0 |
| CDI |
0 |
0 |
0 |
62 |
686 |
1670 |
247 |
16 |
| VCDI |
0 |
0 |
0 |
26 |
191 |
2161 |
18322 |
21792 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7996 |
2496 |
66 |
120 |
9 |
3 |
0 |
0 |
| OW |
28 |
1828 |
198 |
357 |
68 |
20 |
0 |
0 |
| VODI |
0 |
215 |
74 |
575 |
674 |
70 |
11 |
0 |
| ODI |
0 |
3 |
12 |
261 |
513 |
280 |
52 |
4 |
| CDI |
0 |
0 |
0 |
174 |
662 |
1099 |
666 |
786 |
| VCDI |
0 |
0 |
0 |
60 |
401 |
2553 |
17879 |
21018 |
|
Date: 2025-05-21:
| 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 |
8974 |
2629 |
61 |
113 |
6 |
3 |
0 |
0 |
| OW |
226 |
889 |
216 |
327 |
45 |
16 |
0 |
0 |
| VODI |
0 |
59 |
69 |
851 |
411 |
63 |
3 |
0 |
| ODI |
0 |
16 |
1 |
307 |
685 |
167 |
14 |
0 |
| CDI |
0 |
0 |
0 |
175 |
840 |
1725 |
425 |
81 |
| VCDI |
0 |
0 |
1 |
38 |
290 |
2289 |
12792 |
26424 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8777 |
2061 |
51 |
108 |
2 |
2 |
0 |
0 |
| OW |
396 |
1372 |
173 |
352 |
70 |
23 |
0 |
0 |
| VODI |
27 |
129 |
111 |
608 |
499 |
105 |
7 |
0 |
| ODI |
0 |
31 |
11 |
360 |
485 |
300 |
35 |
1 |
| CDI |
0 |
0 |
1 |
329 |
737 |
1371 |
618 |
1281 |
| VCDI |
0 |
0 |
1 |
54 |
484 |
2462 |
12574 |
25223 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8673 |
2266 |
66 |
85 |
4 |
8 |
4 |
0 |
| OW |
369 |
1464 |
135 |
342 |
66 |
37 |
14 |
0 |
| VODI |
0 |
200 |
117 |
582 |
448 |
136 |
27 |
0 |
| ODI |
0 |
40 |
45 |
453 |
468 |
342 |
44 |
104 |
| CDI |
0 |
0 |
3 |
446 |
866 |
1898 |
743 |
1424 |
| VCDI |
0 |
0 |
0 |
36 |
471 |
2301 |
13748 |
22756 |
|
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