Validation of sea ice concentration - American sector
Bulletin date: 2025-09-18
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-09-12:
| 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 |
15677 |
6032 |
42 |
7 |
0 |
0 |
0 |
0 |
| OW |
136 |
3068 |
530 |
309 |
55 |
0 |
0 |
0 |
| VODI |
0 |
188 |
295 |
2122 |
602 |
52 |
0 |
0 |
| ODI |
0 |
9 |
10 |
681 |
2442 |
461 |
7 |
0 |
| CDI |
0 |
1 |
1 |
40 |
1711 |
3894 |
282 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
7 |
4100 |
3105 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-14:
| 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 |
16654 |
5300 |
53 |
11 |
0 |
0 |
0 |
0 |
| OW |
380 |
2698 |
377 |
258 |
24 |
0 |
0 |
0 |
| VODI |
0 |
354 |
349 |
1579 |
740 |
42 |
2 |
0 |
| ODI |
0 |
4 |
10 |
752 |
2205 |
590 |
18 |
0 |
| CDI |
0 |
0 |
0 |
17 |
1035 |
3792 |
347 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
6 |
3092 |
5177 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-16:
| 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 |
17581 |
6175 |
67 |
31 |
5 |
0 |
0 |
0 |
| OW |
39 |
1783 |
490 |
495 |
18 |
0 |
0 |
0 |
| VODI |
0 |
69 |
93 |
1621 |
575 |
38 |
0 |
0 |
| ODI |
0 |
0 |
6 |
225 |
2117 |
359 |
6 |
0 |
| CDI |
0 |
0 |
0 |
11 |
914 |
3840 |
189 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
63 |
2109 |
6947 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-18:
| 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 |
11170 |
952 |
11441 |
287 |
0 |
0 |
0 |
0 |
| OW |
0 |
208 |
2140 |
425 |
0 |
0 |
0 |
0 |
| VODI |
0 |
38 |
1076 |
887 |
409 |
0 |
0 |
0 |
| ODI |
0 |
0 |
774 |
489 |
1305 |
93 |
0 |
0 |
| CDI |
0 |
0 |
1763 |
1026 |
1312 |
825 |
4 |
0 |
| VCDI |
0 |
0 |
6260 |
2160 |
714 |
108 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11170 |
877 |
11819 |
319 |
0 |
0 |
0 |
0 |
| OW |
0 |
250 |
1822 |
379 |
2 |
0 |
0 |
0 |
| VODI |
0 |
71 |
1054 |
896 |
398 |
0 |
0 |
0 |
| ODI |
0 |
0 |
775 |
450 |
1520 |
190 |
0 |
0 |
| CDI |
0 |
0 |
1685 |
1107 |
1114 |
638 |
4 |
0 |
| VCDI |
0 |
0 |
6299 |
2123 |
706 |
198 |
0 |
0 |
|
Date: 2025-09-20:
| 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 |
17358 |
6080 |
73 |
68 |
1 |
0 |
0 |
0 |
| OW |
12 |
1882 |
397 |
419 |
49 |
2 |
0 |
0 |
| VODI |
0 |
158 |
190 |
937 |
839 |
94 |
0 |
0 |
| ODI |
0 |
36 |
22 |
155 |
935 |
1540 |
32 |
0 |
| CDI |
0 |
24 |
24 |
103 |
423 |
3041 |
621 |
3 |
| VCDI |
0 |
0 |
1 |
9 |
36 |
2316 |
6362 |
1624 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
17366 |
6253 |
114 |
92 |
2 |
0 |
0 |
0 |
| OW |
4 |
1670 |
347 |
395 |
64 |
2 |
0 |
0 |
| VODI |
0 |
191 |
197 |
913 |
853 |
175 |
0 |
0 |
| ODI |
0 |
39 |
23 |
169 |
923 |
1551 |
128 |
0 |
| CDI |
0 |
25 |
25 |
104 |
402 |
2902 |
563 |
6 |
| VCDI |
0 |
2 |
1 |
18 |
39 |
2363 |
6324 |
1621 |
|
Date: 2025-09-22:
| 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 |
10056 |
0 |
13693 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
2251 |
39 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
1905 |
201 |
0 |
0 |
0 |
0 |
| ODI |
0 |
0 |
2026 |
409 |
7 |
0 |
0 |
0 |
| CDI |
0 |
0 |
2488 |
1534 |
486 |
388 |
6 |
0 |
| VCDI |
0 |
0 |
4950 |
2830 |
1326 |
943 |
328 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10056 |
0 |
13628 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
2464 |
29 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
1947 |
204 |
0 |
0 |
0 |
0 |
| ODI |
0 |
0 |
2135 |
597 |
22 |
0 |
0 |
0 |
| CDI |
0 |
0 |
2250 |
1385 |
429 |
164 |
6 |
0 |
| VCDI |
0 |
0 |
4889 |
2798 |
1368 |
1167 |
328 |
0 |
|
Date: 2025-09-24:
| 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 |
17013 |
6493 |
76 |
49 |
5 |
1 |
0 |
0 |
| OW |
70 |
1455 |
245 |
406 |
129 |
4 |
0 |
0 |
| VODI |
0 |
297 |
149 |
556 |
759 |
214 |
1 |
0 |
| ODI |
0 |
33 |
24 |
224 |
486 |
1123 |
257 |
0 |
| CDI |
0 |
18 |
20 |
119 |
467 |
2463 |
1651 |
0 |
| VCDI |
0 |
0 |
1 |
8 |
16 |
1308 |
7959 |
1767 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
16939 |
6286 |
72 |
30 |
3 |
0 |
0 |
0 |
| OW |
144 |
1698 |
248 |
395 |
142 |
24 |
0 |
0 |
| VODI |
0 |
266 |
146 |
545 |
844 |
309 |
18 |
0 |
| ODI |
0 |
28 |
36 |
276 |
436 |
1639 |
522 |
0 |
| CDI |
0 |
17 |
12 |
109 |
427 |
2095 |
1932 |
0 |
| VCDI |
0 |
1 |
1 |
7 |
10 |
1046 |
7396 |
1767 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
17102 |
5576 |
66 |
48 |
19 |
0 |
0 |
0 |
| OW |
138 |
1948 |
220 |
349 |
202 |
146 |
4 |
0 |
| VODI |
0 |
293 |
127 |
356 |
480 |
665 |
258 |
0 |
| ODI |
0 |
29 |
29 |
196 |
238 |
939 |
1002 |
0 |
| CDI |
0 |
8 |
10 |
102 |
368 |
1569 |
2159 |
0 |
| VCDI |
0 |
0 |
0 |
12 |
39 |
459 |
5382 |
5328 |
|
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