Validation of sea ice concentration - American sector
Bulletin date: 2025-06-26
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-06-20:
| 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 |
545 |
2617 |
23 |
11 |
1 |
0 |
0 |
0 |
| OW |
71 |
1982 |
204 |
192 |
23 |
0 |
0 |
0 |
| VODI |
6 |
592 |
227 |
652 |
319 |
31 |
18 |
0 |
| ODI |
0 |
75 |
73 |
504 |
1393 |
379 |
122 |
0 |
| CDI |
0 |
6 |
12 |
155 |
1826 |
3155 |
1297 |
0 |
| VCDI |
0 |
0 |
0 |
5 |
1745 |
11282 |
15485 |
838 |
|
...date precedes bulletin
|
Date: 2025-06-22:
| 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 |
743 |
2959 |
21 |
7 |
1 |
0 |
0 |
0 |
| OW |
136 |
1778 |
193 |
227 |
22 |
0 |
2 |
0 |
| VODI |
6 |
683 |
170 |
569 |
265 |
51 |
24 |
0 |
| ODI |
0 |
118 |
95 |
410 |
1507 |
709 |
43 |
0 |
| CDI |
0 |
31 |
16 |
228 |
1552 |
3940 |
739 |
25 |
| VCDI |
0 |
0 |
0 |
3 |
1568 |
11423 |
10792 |
4810 |
|
...date precedes bulletin
|
Date: 2025-06-24:
| 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 |
1021 |
4074 |
28 |
6 |
1 |
0 |
0 |
0 |
| OW |
53 |
1452 |
189 |
166 |
16 |
0 |
1 |
0 |
| VODI |
0 |
324 |
194 |
863 |
453 |
70 |
5 |
0 |
| ODI |
0 |
24 |
22 |
449 |
2395 |
563 |
25 |
0 |
| CDI |
0 |
18 |
7 |
111 |
1399 |
6434 |
607 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
3888 |
10397 |
9100 |
1510 |
|
...date precedes bulletin
|
Date: 2025-06-26:
| 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 |
1841 |
3632 |
21 |
13 |
2 |
0 |
0 |
0 |
| OW |
62 |
1361 |
221 |
234 |
15 |
3 |
0 |
0 |
| VODI |
0 |
494 |
215 |
861 |
425 |
187 |
5 |
0 |
| ODI |
0 |
53 |
51 |
810 |
1884 |
575 |
44 |
0 |
| CDI |
0 |
30 |
15 |
204 |
1107 |
6473 |
578 |
0 |
| VCDI |
0 |
0 |
0 |
27 |
1581 |
14821 |
5650 |
2371 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
1835 |
3661 |
40 |
26 |
2 |
0 |
0 |
0 |
| OW |
68 |
1315 |
173 |
228 |
14 |
5 |
0 |
0 |
| VODI |
0 |
491 |
235 |
876 |
402 |
168 |
6 |
0 |
| ODI |
0 |
73 |
57 |
769 |
1755 |
720 |
55 |
0 |
| CDI |
0 |
30 |
18 |
219 |
1250 |
6032 |
600 |
2 |
| VCDI |
0 |
0 |
0 |
31 |
1591 |
15134 |
5616 |
2369 |
|
Date: 2025-06-28:
| 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 |
2013 |
3846 |
36 |
34 |
5 |
0 |
0 |
0 |
| OW |
32 |
1521 |
218 |
223 |
47 |
2 |
0 |
0 |
| VODI |
0 |
750 |
253 |
1067 |
524 |
70 |
8 |
0 |
| ODI |
0 |
198 |
142 |
1296 |
875 |
505 |
31 |
0 |
| CDI |
0 |
40 |
22 |
244 |
1498 |
5904 |
212 |
0 |
| VCDI |
0 |
0 |
0 |
6 |
1605 |
15655 |
5238 |
1746 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
1990 |
3883 |
63 |
52 |
5 |
0 |
0 |
0 |
| OW |
55 |
1466 |
179 |
196 |
31 |
3 |
0 |
0 |
| VODI |
0 |
732 |
249 |
1049 |
475 |
78 |
8 |
0 |
| ODI |
0 |
227 |
146 |
1181 |
1114 |
661 |
37 |
0 |
| CDI |
0 |
47 |
34 |
383 |
1299 |
5477 |
191 |
0 |
| VCDI |
0 |
0 |
0 |
9 |
1630 |
15917 |
5253 |
1746 |
|
Date: 2025-06-30:
| 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 |
2526 |
4366 |
39 |
32 |
4 |
0 |
0 |
0 |
| OW |
18 |
1877 |
646 |
547 |
9 |
1 |
0 |
0 |
| VODI |
0 |
73 |
152 |
2115 |
705 |
5 |
2 |
0 |
| ODI |
0 |
11 |
6 |
130 |
2026 |
275 |
13 |
0 |
| CDI |
0 |
1 |
3 |
39 |
2455 |
8058 |
78 |
0 |
| VCDI |
0 |
0 |
0 |
33 |
1093 |
12888 |
4526 |
1114 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
2479 |
3772 |
63 |
49 |
5 |
0 |
0 |
0 |
| OW |
64 |
1423 |
182 |
241 |
73 |
6 |
1 |
0 |
| VODI |
1 |
734 |
317 |
1228 |
589 |
64 |
14 |
0 |
| ODI |
0 |
306 |
242 |
1086 |
1277 |
416 |
49 |
0 |
| CDI |
0 |
93 |
40 |
246 |
2343 |
4943 |
129 |
0 |
| VCDI |
0 |
0 |
2 |
46 |
2005 |
15798 |
4426 |
1114 |
|
Date: 2025-07-02:
| 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 |
2506 |
4583 |
60 |
45 |
3 |
0 |
0 |
0 |
| OW |
4 |
2297 |
657 |
657 |
33 |
0 |
0 |
0 |
| VODI |
0 |
248 |
219 |
1444 |
592 |
13 |
2 |
0 |
| ODI |
0 |
18 |
11 |
249 |
2199 |
172 |
7 |
0 |
| CDI |
0 |
3 |
7 |
61 |
3375 |
7138 |
115 |
0 |
| VCDI |
0 |
1 |
1 |
2 |
978 |
12674 |
4989 |
503 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
2452 |
4031 |
67 |
41 |
3 |
0 |
0 |
0 |
| OW |
58 |
1484 |
254 |
219 |
93 |
1 |
1 |
0 |
| VODI |
0 |
1068 |
361 |
1126 |
481 |
36 |
2 |
0 |
| ODI |
0 |
517 |
253 |
867 |
1449 |
280 |
25 |
0 |
| CDI |
0 |
49 |
19 |
199 |
3414 |
4393 |
105 |
0 |
| VCDI |
0 |
1 |
1 |
6 |
1740 |
15287 |
4980 |
503 |
|
Date: 2025-07-04:
| 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 |
3059 |
4441 |
83 |
55 |
11 |
0 |
0 |
0 |
| OW |
68 |
2828 |
597 |
646 |
75 |
7 |
0 |
0 |
| VODI |
18 |
283 |
173 |
820 |
604 |
61 |
2 |
0 |
| ODI |
0 |
40 |
34 |
322 |
1828 |
654 |
9 |
0 |
| CDI |
0 |
5 |
11 |
78 |
2949 |
5457 |
285 |
0 |
| VCDI |
0 |
1 |
1 |
2 |
3428 |
12109 |
4821 |
1 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
3044 |
3671 |
50 |
37 |
10 |
0 |
0 |
0 |
| OW |
79 |
1660 |
289 |
197 |
85 |
6 |
0 |
0 |
| VODI |
2 |
1518 |
336 |
797 |
393 |
90 |
2 |
0 |
| ODI |
10 |
698 |
175 |
610 |
1335 |
443 |
33 |
0 |
| CDI |
10 |
50 |
48 |
277 |
2887 |
4458 |
171 |
0 |
| VCDI |
0 |
1 |
1 |
5 |
4185 |
13291 |
4911 |
1 |
|
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