Validation of sea ice concentration - American sector
Bulletin date: 2025-10-16
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-10-12:
| 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 |
13654 |
4387 |
114 |
158 |
12 |
2 |
0 |
0 |
| OW |
0 |
441 |
168 |
297 |
163 |
69 |
0 |
0 |
| VODI |
0 |
31 |
84 |
303 |
424 |
294 |
21 |
0 |
| ODI |
0 |
2 |
5 |
87 |
192 |
554 |
162 |
0 |
| CDI |
0 |
0 |
1 |
13 |
82 |
834 |
440 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
19 |
3009 |
17323 |
2521 |
|
...date precedes bulletin
|
Date: 2025-10-14:
| 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 |
13554 |
4349 |
76 |
36 |
0 |
0 |
0 |
0 |
| OW |
0 |
470 |
191 |
289 |
14 |
0 |
0 |
0 |
| VODI |
0 |
63 |
91 |
367 |
183 |
27 |
0 |
0 |
| ODI |
0 |
1 |
21 |
179 |
317 |
143 |
13 |
0 |
| CDI |
0 |
0 |
1 |
81 |
356 |
670 |
452 |
0 |
| VCDI |
0 |
0 |
3 |
13 |
92 |
1670 |
14055 |
8089 |
|
...date precedes bulletin
|
Date: 2025-10-16:
| 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 |
13250 |
4293 |
102 |
84 |
1 |
0 |
0 |
0 |
| OW |
1 |
512 |
212 |
337 |
54 |
2 |
0 |
0 |
| VODI |
0 |
35 |
86 |
381 |
311 |
38 |
0 |
0 |
| ODI |
0 |
4 |
5 |
102 |
329 |
258 |
41 |
0 |
| CDI |
0 |
0 |
0 |
25 |
206 |
670 |
533 |
0 |
| VCDI |
0 |
0 |
0 |
20 |
39 |
1901 |
15346 |
6688 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13251 |
4374 |
114 |
102 |
4 |
0 |
0 |
0 |
| OW |
0 |
445 |
209 |
287 |
64 |
4 |
0 |
0 |
| VODI |
0 |
23 |
79 |
407 |
276 |
43 |
0 |
0 |
| ODI |
0 |
2 |
3 |
110 |
381 |
272 |
65 |
0 |
| CDI |
0 |
0 |
0 |
29 |
161 |
578 |
602 |
0 |
| VCDI |
0 |
0 |
0 |
14 |
54 |
1972 |
15253 |
6688 |
|
Date: 2025-10-18:
| 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 |
12970 |
4331 |
137 |
151 |
27 |
0 |
0 |
0 |
| OW |
3 |
562 |
149 |
272 |
95 |
45 |
0 |
0 |
| VODI |
0 |
86 |
94 |
304 |
287 |
112 |
0 |
0 |
| ODI |
0 |
5 |
17 |
128 |
311 |
198 |
8 |
0 |
| CDI |
0 |
1 |
0 |
35 |
276 |
551 |
238 |
0 |
| VCDI |
0 |
0 |
0 |
7 |
32 |
2393 |
15383 |
6658 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12970 |
4365 |
138 |
168 |
42 |
1 |
0 |
0 |
| OW |
3 |
527 |
153 |
240 |
89 |
49 |
0 |
0 |
| VODI |
0 |
80 |
74 |
300 |
267 |
110 |
1 |
0 |
| ODI |
0 |
13 |
32 |
140 |
355 |
210 |
9 |
0 |
| CDI |
0 |
0 |
0 |
45 |
237 |
624 |
262 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
38 |
2305 |
15357 |
6658 |
|
Date: 2025-10-20:
| 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 |
12558 |
4701 |
161 |
78 |
5 |
0 |
0 |
0 |
| OW |
0 |
363 |
259 |
255 |
42 |
0 |
0 |
0 |
| VODI |
0 |
6 |
50 |
386 |
220 |
32 |
5 |
0 |
| ODI |
0 |
0 |
1 |
50 |
423 |
152 |
151 |
0 |
| CDI |
0 |
0 |
0 |
2 |
209 |
1023 |
161 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
23 |
2392 |
11036 |
11121 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12548 |
4448 |
170 |
165 |
53 |
2 |
0 |
0 |
| OW |
10 |
477 |
175 |
222 |
160 |
71 |
4 |
0 |
| VODI |
0 |
115 |
81 |
222 |
238 |
222 |
10 |
0 |
| ODI |
0 |
30 |
37 |
112 |
212 |
343 |
45 |
0 |
| CDI |
0 |
0 |
8 |
43 |
186 |
503 |
267 |
0 |
| VCDI |
0 |
0 |
0 |
8 |
73 |
2458 |
11027 |
11121 |
|
Date: 2025-10-22:
| 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 |
12570 |
3934 |
249 |
290 |
76 |
3 |
0 |
0 |
| OW |
0 |
176 |
119 |
424 |
113 |
36 |
0 |
0 |
| VODI |
0 |
32 |
57 |
268 |
191 |
115 |
6 |
0 |
| ODI |
0 |
1 |
3 |
88 |
270 |
214 |
36 |
0 |
| CDI |
0 |
0 |
0 |
19 |
301 |
815 |
365 |
0 |
| VCDI |
0 |
0 |
0 |
5 |
44 |
1911 |
14926 |
8209 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12478 |
3757 |
219 |
324 |
144 |
48 |
0 |
0 |
| OW |
92 |
243 |
115 |
253 |
84 |
108 |
26 |
0 |
| VODI |
0 |
100 |
65 |
307 |
201 |
224 |
57 |
0 |
| ODI |
0 |
40 |
24 |
125 |
207 |
240 |
65 |
0 |
| CDI |
0 |
3 |
5 |
74 |
221 |
531 |
298 |
0 |
| VCDI |
0 |
0 |
0 |
11 |
138 |
1943 |
14887 |
8209 |
|
Date: 2025-10-24:
| 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 |
11974 |
4092 |
190 |
286 |
55 |
0 |
0 |
0 |
| OW |
0 |
282 |
100 |
256 |
135 |
15 |
2 |
0 |
| VODI |
0 |
117 |
41 |
192 |
337 |
95 |
7 |
0 |
| ODI |
0 |
30 |
35 |
84 |
183 |
192 |
45 |
0 |
| CDI |
0 |
1 |
10 |
73 |
288 |
721 |
241 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
106 |
3394 |
11327 |
10956 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11971 |
3906 |
171 |
279 |
124 |
66 |
2 |
0 |
| OW |
3 |
437 |
95 |
198 |
82 |
91 |
20 |
0 |
| VODI |
0 |
134 |
82 |
259 |
256 |
175 |
44 |
0 |
| ODI |
0 |
35 |
23 |
114 |
268 |
253 |
93 |
0 |
| CDI |
0 |
10 |
5 |
39 |
192 |
497 |
383 |
0 |
| VCDI |
0 |
0 |
0 |
6 |
182 |
3335 |
11080 |
10956 |
|
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