Validation of sea ice concentration - American sector
Bulletin date: 2025-09-25
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-09-19:
| 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 |
17442 |
6211 |
78 |
42 |
2 |
0 |
0 |
0 |
| OW |
27 |
1765 |
478 |
482 |
17 |
2 |
0 |
0 |
| VODI |
0 |
157 |
178 |
1006 |
832 |
89 |
0 |
0 |
| ODI |
0 |
24 |
13 |
136 |
677 |
1763 |
109 |
0 |
| CDI |
0 |
17 |
23 |
80 |
529 |
3133 |
787 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
48 |
2090 |
6170 |
1459 |
|
...date precedes bulletin
|
Date: 2025-09-21:
| 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 |
17635 |
5668 |
74 |
60 |
5 |
0 |
0 |
0 |
| OW |
5 |
1885 |
305 |
446 |
113 |
5 |
0 |
0 |
| VODI |
0 |
191 |
147 |
659 |
948 |
165 |
0 |
0 |
| ODI |
0 |
36 |
22 |
193 |
730 |
1612 |
43 |
0 |
| CDI |
0 |
29 |
18 |
97 |
429 |
3046 |
659 |
0 |
| VCDI |
0 |
0 |
0 |
9 |
27 |
2979 |
5767 |
1859 |
|
...date precedes bulletin
|
Date: 2025-09-23:
| 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 |
17692 |
5968 |
63 |
54 |
6 |
0 |
0 |
0 |
| OW |
66 |
1388 |
258 |
363 |
154 |
4 |
0 |
0 |
| VODI |
0 |
288 |
139 |
553 |
831 |
203 |
0 |
0 |
| ODI |
0 |
45 |
32 |
217 |
571 |
1202 |
264 |
0 |
| CDI |
0 |
35 |
20 |
100 |
498 |
2435 |
1766 |
0 |
| VCDI |
0 |
0 |
3 |
11 |
19 |
1507 |
7258 |
1853 |
|
...date precedes bulletin
|
Date: 2025-09-25:
| 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 |
17170 |
5867 |
73 |
60 |
14 |
0 |
0 |
0 |
| OW |
66 |
1767 |
256 |
379 |
147 |
8 |
0 |
0 |
| VODI |
0 |
237 |
150 |
551 |
732 |
263 |
13 |
0 |
| ODI |
0 |
23 |
26 |
190 |
423 |
1098 |
140 |
0 |
| CDI |
0 |
10 |
13 |
144 |
428 |
2398 |
1334 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
24 |
1000 |
7903 |
2955 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
17182 |
6056 |
96 |
117 |
27 |
0 |
0 |
0 |
| OW |
54 |
1547 |
190 |
226 |
177 |
12 |
0 |
0 |
| VODI |
0 |
269 |
191 |
608 |
635 |
246 |
13 |
0 |
| ODI |
0 |
22 |
27 |
226 |
514 |
1107 |
163 |
0 |
| CDI |
0 |
10 |
14 |
141 |
391 |
2407 |
1425 |
0 |
| VCDI |
0 |
0 |
0 |
10 |
24 |
995 |
7789 |
2955 |
|
Date: 2025-09-27:
| 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 |
16346 |
6017 |
66 |
49 |
0 |
0 |
0 |
0 |
| OW |
0 |
2115 |
285 |
331 |
112 |
25 |
0 |
0 |
| VODI |
0 |
230 |
128 |
353 |
547 |
390 |
112 |
0 |
| ODI |
0 |
25 |
27 |
198 |
264 |
695 |
383 |
0 |
| CDI |
0 |
3 |
5 |
54 |
313 |
1243 |
2280 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
13 |
820 |
7328 |
5108 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
16346 |
6376 |
86 |
85 |
14 |
3 |
0 |
0 |
| OW |
0 |
1723 |
236 |
234 |
104 |
51 |
16 |
0 |
| VODI |
0 |
263 |
158 |
420 |
480 |
395 |
125 |
0 |
| ODI |
0 |
22 |
23 |
190 |
355 |
654 |
443 |
0 |
| CDI |
0 |
6 |
8 |
56 |
281 |
1209 |
2175 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
15 |
861 |
7344 |
5108 |
|
Date: 2025-09-29:
| 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 |
15573 |
6333 |
137 |
82 |
16 |
0 |
0 |
0 |
| OW |
0 |
1082 |
411 |
451 |
81 |
0 |
0 |
0 |
| VODI |
0 |
32 |
76 |
950 |
270 |
12 |
0 |
0 |
| ODI |
0 |
0 |
0 |
188 |
721 |
135 |
4 |
0 |
| CDI |
0 |
0 |
0 |
3 |
472 |
1632 |
65 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
7 |
1300 |
12162 |
3671 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
15573 |
5654 |
185 |
249 |
42 |
8 |
0 |
0 |
| OW |
0 |
1310 |
246 |
565 |
312 |
82 |
28 |
0 |
| VODI |
0 |
451 |
161 |
566 |
464 |
441 |
109 |
0 |
| ODI |
0 |
29 |
25 |
209 |
361 |
441 |
378 |
0 |
| CDI |
0 |
3 |
7 |
80 |
348 |
1097 |
1210 |
0 |
| VCDI |
0 |
0 |
0 |
5 |
40 |
1010 |
10506 |
3671 |
|
Date: 2025-10-01:
| 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 |
15409 |
5554 |
112 |
99 |
1 |
0 |
0 |
0 |
| OW |
0 |
1314 |
424 |
555 |
72 |
1 |
0 |
0 |
| VODI |
0 |
118 |
114 |
676 |
424 |
32 |
0 |
0 |
| ODI |
0 |
4 |
15 |
233 |
649 |
240 |
3 |
0 |
| CDI |
0 |
2 |
5 |
23 |
476 |
1295 |
30 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
133 |
2263 |
7146 |
8444 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
15409 |
5249 |
179 |
225 |
29 |
18 |
2 |
0 |
| OW |
0 |
1339 |
290 |
485 |
396 |
114 |
16 |
0 |
| VODI |
0 |
383 |
159 |
550 |
598 |
555 |
81 |
0 |
| ODI |
0 |
19 |
28 |
172 |
292 |
674 |
366 |
0 |
| CDI |
0 |
2 |
14 |
148 |
257 |
711 |
1149 |
0 |
| VCDI |
0 |
0 |
0 |
6 |
183 |
1759 |
5565 |
8444 |
|
Date: 2025-10-03:
| 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 |
14609 |
4946 |
247 |
291 |
17 |
2 |
0 |
0 |
| OW |
0 |
1156 |
339 |
643 |
291 |
32 |
0 |
0 |
| VODI |
0 |
263 |
140 |
648 |
574 |
194 |
1 |
0 |
| ODI |
0 |
23 |
9 |
114 |
459 |
401 |
36 |
0 |
| CDI |
0 |
4 |
2 |
4 |
160 |
1362 |
360 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
37 |
1489 |
9197 |
7816 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
14609 |
4922 |
344 |
471 |
323 |
109 |
47 |
0 |
| OW |
0 |
950 |
207 |
469 |
345 |
347 |
113 |
0 |
| VODI |
0 |
423 |
127 |
308 |
228 |
316 |
364 |
0 |
| ODI |
0 |
96 |
49 |
350 |
348 |
489 |
567 |
0 |
| CDI |
0 |
1 |
7 |
69 |
192 |
472 |
1050 |
12 |
| VCDI |
0 |
0 |
3 |
33 |
102 |
1747 |
7453 |
7804 |
|
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