Validation of sea ice concentration - American sector
Bulletin date: 2025-10-02
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-09-26:
| 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 |
17085 |
5610 |
68 |
51 |
9 |
0 |
0 |
0 |
| OW |
155 |
1924 |
221 |
313 |
136 |
28 |
0 |
0 |
| VODI |
0 |
283 |
131 |
410 |
573 |
491 |
29 |
0 |
| ODI |
0 |
33 |
21 |
171 |
251 |
865 |
380 |
0 |
| CDI |
0 |
4 |
11 |
118 |
365 |
1799 |
1871 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
12 |
595 |
6525 |
5328 |
|
...date precedes bulletin
|
Date: 2025-09-28:
| 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 |
15843 |
5991 |
117 |
87 |
1 |
0 |
0 |
0 |
| OW |
0 |
1867 |
378 |
568 |
129 |
26 |
0 |
0 |
| VODI |
0 |
199 |
125 |
473 |
447 |
364 |
51 |
0 |
| ODI |
0 |
15 |
21 |
180 |
411 |
577 |
210 |
0 |
| CDI |
0 |
3 |
2 |
60 |
330 |
1133 |
1633 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
13 |
945 |
9178 |
4489 |
|
...date precedes bulletin
|
Date: 2025-09-30:
| 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 |
15552 |
6021 |
101 |
72 |
0 |
0 |
0 |
0 |
| OW |
0 |
1242 |
412 |
426 |
62 |
0 |
0 |
0 |
| VODI |
0 |
99 |
119 |
674 |
377 |
15 |
0 |
0 |
| ODI |
0 |
4 |
8 |
217 |
780 |
90 |
4 |
0 |
| CDI |
0 |
1 |
2 |
26 |
551 |
1197 |
20 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
36 |
2011 |
11598 |
4149 |
|
...date precedes bulletin
|
Date: 2025-10-02:
| 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 |
15033 |
5199 |
187 |
222 |
10 |
0 |
0 |
0 |
| OW |
0 |
1357 |
322 |
713 |
166 |
3 |
0 |
0 |
| VODI |
0 |
144 |
94 |
659 |
546 |
55 |
0 |
0 |
| ODI |
0 |
9 |
13 |
132 |
653 |
289 |
4 |
0 |
| CDI |
0 |
0 |
2 |
11 |
301 |
1514 |
116 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
108 |
1916 |
8522 |
7566 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
15033 |
5596 |
256 |
327 |
51 |
0 |
0 |
0 |
| OW |
0 |
966 |
254 |
686 |
173 |
5 |
0 |
0 |
| VODI |
0 |
142 |
94 |
582 |
542 |
68 |
0 |
0 |
| ODI |
0 |
5 |
14 |
133 |
646 |
358 |
5 |
0 |
| CDI |
0 |
0 |
0 |
9 |
283 |
1469 |
134 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
89 |
1877 |
8503 |
7566 |
|
Date: 2025-10-04:
| 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 |
13854 |
4924 |
294 |
426 |
83 |
0 |
0 |
0 |
| OW |
0 |
672 |
266 |
765 |
312 |
27 |
0 |
0 |
| VODI |
0 |
223 |
122 |
863 |
667 |
364 |
14 |
0 |
| ODI |
0 |
14 |
11 |
118 |
406 |
543 |
61 |
0 |
| CDI |
0 |
0 |
3 |
11 |
101 |
939 |
550 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
25 |
2740 |
13615 |
2853 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13854 |
5029 |
350 |
639 |
165 |
7 |
0 |
0 |
| OW |
0 |
604 |
220 |
773 |
339 |
80 |
0 |
0 |
| VODI |
0 |
194 |
114 |
657 |
640 |
373 |
13 |
0 |
| ODI |
0 |
6 |
10 |
107 |
352 |
550 |
72 |
0 |
| CDI |
0 |
0 |
2 |
7 |
73 |
1043 |
690 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
25 |
2560 |
13465 |
2853 |
|
Date: 2025-10-06:
| 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 |
14421 |
4806 |
113 |
61 |
0 |
0 |
0 |
0 |
| OW |
0 |
376 |
254 |
446 |
14 |
0 |
0 |
0 |
| VODI |
0 |
7 |
58 |
967 |
349 |
0 |
0 |
0 |
| ODI |
0 |
3 |
0 |
108 |
862 |
196 |
17 |
0 |
| CDI |
0 |
0 |
1 |
2 |
345 |
1946 |
133 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
22 |
2911 |
13297 |
4151 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
14421 |
4745 |
176 |
296 |
29 |
0 |
0 |
0 |
| OW |
0 |
384 |
164 |
524 |
344 |
66 |
0 |
0 |
| VODI |
0 |
53 |
77 |
621 |
594 |
414 |
6 |
0 |
| ODI |
0 |
8 |
8 |
129 |
438 |
772 |
125 |
0 |
| CDI |
0 |
2 |
1 |
14 |
161 |
764 |
560 |
22 |
| VCDI |
0 |
0 |
0 |
0 |
26 |
3037 |
12756 |
4129 |
|
Date: 2025-10-08:
| 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 |
14614 |
4697 |
118 |
60 |
5 |
0 |
0 |
0 |
| OW |
0 |
309 |
217 |
406 |
86 |
2 |
0 |
0 |
| VODI |
0 |
35 |
55 |
522 |
591 |
32 |
0 |
0 |
| ODI |
0 |
3 |
3 |
75 |
596 |
322 |
3 |
0 |
| CDI |
0 |
0 |
2 |
9 |
119 |
1161 |
280 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
23 |
2511 |
12107 |
6903 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
14614 |
4655 |
217 |
385 |
144 |
0 |
0 |
0 |
| OW |
0 |
320 |
123 |
327 |
289 |
91 |
0 |
0 |
| VODI |
0 |
63 |
42 |
314 |
580 |
592 |
62 |
0 |
| ODI |
0 |
6 |
13 |
38 |
349 |
722 |
194 |
0 |
| CDI |
0 |
0 |
0 |
8 |
49 |
758 |
728 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
9 |
1865 |
11406 |
6903 |
|
Date: 2025-10-10:
| 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 |
13979 |
4758 |
142 |
141 |
32 |
0 |
0 |
0 |
| OW |
0 |
384 |
188 |
344 |
191 |
11 |
0 |
0 |
| VODI |
0 |
28 |
60 |
337 |
508 |
228 |
2 |
0 |
| ODI |
0 |
4 |
3 |
95 |
275 |
496 |
88 |
0 |
| CDI |
0 |
1 |
1 |
8 |
197 |
734 |
323 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
49 |
5418 |
15228 |
1613 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13979 |
4830 |
251 |
468 |
343 |
105 |
0 |
0 |
| OW |
0 |
285 |
86 |
223 |
336 |
257 |
16 |
0 |
| VODI |
0 |
50 |
47 |
175 |
335 |
805 |
296 |
0 |
| ODI |
0 |
10 |
8 |
54 |
138 |
610 |
352 |
0 |
| CDI |
0 |
0 |
2 |
5 |
77 |
784 |
763 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
23 |
4326 |
14214 |
1613 |
|
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