Validation of sea ice concentration - American sector
Bulletin date: 2025-07-03
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-06-27:
| 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 |
1336 |
4286 |
41 |
50 |
8 |
0 |
0 |
0 |
| OW |
41 |
1470 |
222 |
218 |
21 |
1 |
0 |
0 |
| VODI |
0 |
672 |
215 |
898 |
548 |
36 |
11 |
0 |
| ODI |
0 |
89 |
75 |
1293 |
1355 |
438 |
25 |
0 |
| CDI |
0 |
30 |
15 |
243 |
1552 |
6260 |
241 |
0 |
| VCDI |
0 |
0 |
1 |
43 |
1444 |
15033 |
5425 |
2230 |
|
...date precedes bulletin
|
Date: 2025-06-29:
| 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 |
2046 |
4006 |
40 |
29 |
3 |
0 |
0 |
0 |
| OW |
53 |
1474 |
244 |
225 |
79 |
8 |
3 |
0 |
| VODI |
1 |
761 |
290 |
1333 |
502 |
89 |
8 |
0 |
| ODI |
0 |
208 |
141 |
1202 |
832 |
528 |
60 |
0 |
| CDI |
0 |
39 |
19 |
207 |
1902 |
5432 |
204 |
0 |
| VCDI |
0 |
0 |
1 |
5 |
2008 |
16269 |
4841 |
774 |
|
...date precedes bulletin
|
Date: 2025-07-01:
| 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 |
2839 |
4161 |
49 |
35 |
3 |
0 |
0 |
0 |
| OW |
11 |
2007 |
585 |
712 |
16 |
0 |
0 |
0 |
| VODI |
0 |
173 |
211 |
1796 |
638 |
17 |
2 |
0 |
| ODI |
0 |
14 |
8 |
191 |
1963 |
332 |
8 |
0 |
| CDI |
0 |
6 |
4 |
50 |
3402 |
7394 |
104 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
1021 |
11592 |
4461 |
2058 |
|
...date precedes bulletin
|
Date: 2025-07-03:
| 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 |
3095 |
4194 |
75 |
41 |
4 |
0 |
0 |
0 |
| OW |
50 |
2547 |
567 |
732 |
66 |
0 |
0 |
0 |
| VODI |
1 |
363 |
209 |
1011 |
626 |
22 |
0 |
0 |
| ODI |
0 |
23 |
20 |
323 |
2123 |
275 |
10 |
0 |
| CDI |
0 |
4 |
11 |
72 |
3568 |
6088 |
65 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
1377 |
12053 |
6117 |
132 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
3072 |
4207 |
77 |
36 |
3 |
0 |
0 |
0 |
| OW |
74 |
2511 |
552 |
679 |
52 |
0 |
0 |
0 |
| VODI |
0 |
383 |
217 |
1054 |
604 |
22 |
0 |
0 |
| ODI |
0 |
25 |
26 |
333 |
2157 |
293 |
10 |
0 |
| CDI |
0 |
5 |
10 |
77 |
3543 |
5705 |
79 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
1405 |
12418 |
6103 |
132 |
|
Date: 2025-07-05:
| 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 |
1252 |
6373 |
185 |
140 |
5 |
0 |
0 |
0 |
| OW |
17 |
3024 |
533 |
582 |
100 |
0 |
0 |
0 |
| VODI |
14 |
254 |
158 |
742 |
569 |
67 |
1 |
0 |
| ODI |
0 |
54 |
44 |
328 |
2013 |
382 |
13 |
0 |
| CDI |
0 |
5 |
13 |
101 |
3404 |
4634 |
49 |
0 |
| VCDI |
0 |
0 |
2 |
11 |
3383 |
13485 |
3840 |
89 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
1249 |
6359 |
185 |
145 |
7 |
0 |
0 |
0 |
| OW |
23 |
2998 |
510 |
564 |
93 |
1 |
0 |
0 |
| VODI |
11 |
286 |
174 |
699 |
537 |
65 |
1 |
0 |
| ODI |
0 |
62 |
45 |
379 |
2075 |
395 |
12 |
0 |
| CDI |
0 |
5 |
19 |
105 |
3440 |
4511 |
53 |
0 |
| VCDI |
0 |
0 |
2 |
12 |
3322 |
13596 |
3837 |
89 |
|
Date: 2025-07-07:
| 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 |
3948 |
6662 |
74 |
51 |
3 |
0 |
0 |
0 |
| OW |
14 |
1265 |
447 |
387 |
36 |
1 |
0 |
0 |
| VODI |
0 |
30 |
80 |
1166 |
496 |
4 |
0 |
0 |
| ODI |
0 |
1 |
2 |
110 |
3926 |
438 |
4 |
0 |
| CDI |
0 |
0 |
2 |
11 |
3862 |
12613 |
99 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
598 |
6325 |
3210 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
3933 |
5094 |
50 |
33 |
3 |
0 |
0 |
0 |
| OW |
29 |
2425 |
258 |
498 |
155 |
4 |
1 |
0 |
| VODI |
0 |
366 |
225 |
627 |
437 |
42 |
4 |
0 |
| ODI |
0 |
58 |
54 |
459 |
1920 |
390 |
23 |
0 |
| CDI |
0 |
15 |
17 |
102 |
3850 |
5260 |
116 |
0 |
| VCDI |
0 |
0 |
1 |
7 |
2556 |
13685 |
3169 |
0 |
|
Date: 2025-07-09:
| 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 |
5925 |
5028 |
48 |
32 |
1 |
0 |
0 |
0 |
| OW |
62 |
1200 |
284 |
279 |
47 |
0 |
0 |
0 |
| VODI |
5 |
169 |
179 |
940 |
610 |
20 |
0 |
0 |
| ODI |
0 |
4 |
14 |
144 |
2930 |
1288 |
8 |
0 |
| CDI |
0 |
0 |
0 |
75 |
2814 |
15621 |
218 |
0 |
| VCDI |
0 |
0 |
0 |
9 |
671 |
4305 |
2936 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5504 |
4105 |
39 |
26 |
1 |
0 |
0 |
0 |
| OW |
478 |
1713 |
153 |
357 |
157 |
7 |
0 |
0 |
| VODI |
10 |
493 |
251 |
562 |
428 |
42 |
0 |
0 |
| ODI |
0 |
74 |
64 |
356 |
1716 |
590 |
4 |
0 |
| CDI |
0 |
16 |
18 |
151 |
2585 |
9561 |
333 |
0 |
| VCDI |
0 |
0 |
0 |
27 |
2186 |
11034 |
2825 |
0 |
|
Date: 2025-07-11:
| 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 |
6260 |
4613 |
63 |
25 |
0 |
0 |
0 |
0 |
| OW |
50 |
1435 |
205 |
284 |
29 |
1 |
0 |
0 |
| VODI |
1 |
209 |
172 |
835 |
723 |
44 |
4 |
0 |
| ODI |
0 |
18 |
27 |
176 |
2361 |
1670 |
1 |
0 |
| CDI |
0 |
0 |
4 |
79 |
4729 |
14976 |
703 |
0 |
| VCDI |
0 |
0 |
0 |
10 |
599 |
2967 |
2593 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5924 |
3906 |
54 |
21 |
1 |
0 |
0 |
0 |
| OW |
381 |
1676 |
154 |
346 |
77 |
11 |
0 |
0 |
| VODI |
6 |
574 |
188 |
605 |
501 |
52 |
0 |
0 |
| ODI |
0 |
89 |
49 |
296 |
1419 |
765 |
15 |
0 |
| CDI |
0 |
30 |
24 |
126 |
4945 |
12059 |
478 |
0 |
| VCDI |
0 |
0 |
2 |
15 |
1498 |
6771 |
2808 |
0 |
|
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