Validation of sea ice concentration - American sector
Bulletin date: 2025-10-30
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-10-26:
| 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 |
11618 |
3754 |
219 |
259 |
84 |
8 |
0 |
0 |
| OW |
6 |
222 |
114 |
244 |
164 |
29 |
11 |
0 |
| VODI |
0 |
77 |
52 |
219 |
330 |
137 |
19 |
0 |
| ODI |
0 |
8 |
14 |
84 |
212 |
286 |
19 |
0 |
| CDI |
0 |
0 |
0 |
38 |
240 |
796 |
185 |
0 |
| VCDI |
0 |
6 |
7 |
25 |
130 |
3066 |
16403 |
6781 |
|
...date precedes bulletin
|
Date: 2025-10-28:
| 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 |
11866 |
3307 |
184 |
282 |
61 |
0 |
0 |
0 |
| OW |
0 |
226 |
113 |
343 |
109 |
18 |
0 |
0 |
| VODI |
0 |
43 |
55 |
266 |
359 |
88 |
8 |
0 |
| ODI |
0 |
1 |
7 |
65 |
340 |
470 |
87 |
0 |
| CDI |
0 |
0 |
0 |
12 |
143 |
1002 |
305 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
19 |
2064 |
17692 |
6331 |
|
...date precedes bulletin
|
Date: 2025-10-30:
| 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 |
11046 |
3570 |
237 |
317 |
134 |
13 |
0 |
0 |
| OW |
0 |
245 |
132 |
356 |
148 |
19 |
0 |
0 |
| VODI |
0 |
43 |
69 |
291 |
278 |
103 |
0 |
0 |
| ODI |
0 |
2 |
8 |
142 |
293 |
322 |
15 |
0 |
| CDI |
0 |
0 |
0 |
16 |
163 |
899 |
283 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
12 |
1991 |
12186 |
12533 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11046 |
3578 |
239 |
335 |
146 |
15 |
0 |
0 |
| OW |
0 |
229 |
122 |
299 |
149 |
19 |
0 |
0 |
| VODI |
0 |
52 |
78 |
329 |
249 |
96 |
0 |
0 |
| ODI |
0 |
1 |
7 |
151 |
301 |
323 |
27 |
0 |
| CDI |
0 |
0 |
0 |
8 |
175 |
881 |
252 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
8 |
2013 |
12205 |
12533 |
|
Date: 2025-11-01:
| 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 |
10792 |
3821 |
218 |
223 |
19 |
0 |
0 |
0 |
| OW |
0 |
537 |
146 |
285 |
79 |
3 |
0 |
0 |
| VODI |
0 |
213 |
88 |
272 |
200 |
50 |
0 |
0 |
| ODI |
0 |
40 |
41 |
213 |
296 |
95 |
2 |
0 |
| CDI |
0 |
8 |
18 |
106 |
430 |
437 |
47 |
0 |
| VCDI |
0 |
0 |
0 |
6 |
126 |
1572 |
9054 |
16429 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10792 |
3788 |
236 |
240 |
30 |
0 |
0 |
0 |
| OW |
0 |
541 |
118 |
285 |
97 |
4 |
0 |
0 |
| VODI |
0 |
235 |
99 |
268 |
173 |
43 |
0 |
0 |
| ODI |
0 |
45 |
40 |
213 |
291 |
95 |
2 |
0 |
| CDI |
0 |
10 |
15 |
88 |
439 |
419 |
60 |
1 |
| VCDI |
0 |
0 |
3 |
11 |
120 |
1596 |
9041 |
16428 |
|
Date: 2025-11-03:
| 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 |
10379 |
3939 |
243 |
355 |
37 |
0 |
0 |
0 |
| OW |
0 |
700 |
188 |
406 |
105 |
0 |
0 |
0 |
| VODI |
0 |
44 |
61 |
427 |
356 |
15 |
0 |
0 |
| ODI |
0 |
7 |
11 |
58 |
601 |
156 |
15 |
0 |
| CDI |
0 |
2 |
3 |
28 |
217 |
545 |
123 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
70 |
1384 |
11236 |
14151 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10378 |
3781 |
262 |
543 |
92 |
0 |
0 |
0 |
| OW |
1 |
471 |
96 |
275 |
197 |
6 |
0 |
0 |
| VODI |
0 |
256 |
65 |
202 |
339 |
83 |
4 |
0 |
| ODI |
0 |
97 |
41 |
121 |
291 |
86 |
17 |
0 |
| CDI |
0 |
47 |
28 |
92 |
257 |
346 |
79 |
0 |
| VCDI |
0 |
40 |
14 |
45 |
210 |
1579 |
11274 |
14151 |
|
Date: 2025-11-05:
| 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 |
9935 |
3748 |
259 |
434 |
119 |
0 |
0 |
0 |
| OW |
0 |
448 |
207 |
476 |
324 |
8 |
0 |
0 |
| VODI |
0 |
81 |
93 |
314 |
449 |
62 |
1 |
0 |
| ODI |
0 |
11 |
27 |
178 |
323 |
103 |
6 |
0 |
| CDI |
0 |
1 |
6 |
51 |
289 |
471 |
46 |
0 |
| VCDI |
0 |
0 |
0 |
7 |
239 |
1907 |
9889 |
15354 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9928 |
3668 |
278 |
467 |
197 |
8 |
0 |
0 |
| OW |
7 |
420 |
141 |
367 |
255 |
19 |
0 |
0 |
| VODI |
0 |
149 |
116 |
314 |
413 |
87 |
4 |
0 |
| ODI |
0 |
38 |
38 |
182 |
317 |
134 |
8 |
0 |
| CDI |
0 |
13 |
16 |
108 |
324 |
383 |
40 |
0 |
| VCDI |
0 |
1 |
3 |
22 |
237 |
1920 |
9890 |
15354 |
|
Date: 2025-11-07:
| 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 |
9586 |
3449 |
265 |
381 |
58 |
4 |
0 |
0 |
| OW |
0 |
360 |
193 |
546 |
356 |
105 |
0 |
0 |
| VODI |
0 |
91 |
87 |
357 |
457 |
162 |
3 |
0 |
| ODI |
0 |
6 |
37 |
180 |
346 |
154 |
28 |
0 |
| CDI |
0 |
0 |
3 |
75 |
360 |
380 |
144 |
0 |
| VCDI |
0 |
0 |
0 |
18 |
420 |
1575 |
10565 |
15115 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9553 |
3271 |
234 |
448 |
117 |
26 |
0 |
0 |
| OW |
33 |
421 |
187 |
499 |
290 |
71 |
3 |
0 |
| VODI |
0 |
140 |
99 |
332 |
502 |
179 |
31 |
0 |
| ODI |
0 |
39 |
36 |
147 |
374 |
187 |
63 |
0 |
| CDI |
0 |
28 |
21 |
78 |
301 |
243 |
157 |
0 |
| VCDI |
0 |
7 |
8 |
53 |
413 |
1674 |
10486 |
15115 |
|
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