Validation of sea ice concentration - American sector
Bulletin date: 2025-10-23
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-10-17:
| 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 |
13065 |
4275 |
127 |
101 |
23 |
0 |
0 |
0 |
| OW |
6 |
562 |
151 |
303 |
118 |
14 |
0 |
0 |
| VODI |
0 |
50 |
102 |
347 |
286 |
97 |
0 |
0 |
| ODI |
0 |
6 |
19 |
118 |
306 |
242 |
24 |
0 |
| CDI |
0 |
0 |
2 |
40 |
223 |
689 |
327 |
0 |
| VCDI |
0 |
0 |
4 |
12 |
28 |
1909 |
15109 |
7181 |
|
...date precedes bulletin
|
Date: 2025-10-19:
| 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 |
12790 |
4446 |
119 |
194 |
24 |
0 |
0 |
0 |
| OW |
8 |
539 |
147 |
256 |
152 |
27 |
0 |
0 |
| VODI |
0 |
62 |
65 |
302 |
355 |
96 |
3 |
0 |
| ODI |
0 |
19 |
18 |
89 |
341 |
206 |
10 |
0 |
| CDI |
0 |
0 |
2 |
40 |
210 |
524 |
166 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
54 |
2336 |
13341 |
8924 |
|
...date precedes bulletin
|
Date: 2025-10-21:
| 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 |
12397 |
4479 |
246 |
229 |
51 |
0 |
0 |
0 |
| OW |
1 |
293 |
177 |
289 |
70 |
20 |
0 |
0 |
| VODI |
0 |
28 |
66 |
262 |
210 |
84 |
6 |
0 |
| ODI |
0 |
0 |
0 |
113 |
310 |
146 |
38 |
0 |
| CDI |
0 |
0 |
0 |
6 |
474 |
755 |
346 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
68 |
2453 |
12104 |
10143 |
|
...date precedes bulletin
|
Date: 2025-10-23:
| 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 |
12356 |
4012 |
203 |
248 |
25 |
0 |
0 |
0 |
| OW |
0 |
311 |
77 |
289 |
150 |
19 |
0 |
0 |
| VODI |
0 |
133 |
34 |
184 |
228 |
124 |
9 |
0 |
| ODI |
0 |
44 |
29 |
62 |
211 |
207 |
40 |
0 |
| CDI |
0 |
12 |
21 |
83 |
227 |
685 |
331 |
0 |
| VCDI |
0 |
0 |
0 |
10 |
81 |
1990 |
15359 |
8072 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12356 |
4010 |
195 |
257 |
33 |
3 |
0 |
0 |
| OW |
0 |
305 |
85 |
255 |
155 |
31 |
0 |
0 |
| VODI |
0 |
125 |
34 |
209 |
220 |
128 |
25 |
0 |
| ODI |
0 |
54 |
19 |
56 |
208 |
237 |
35 |
0 |
| CDI |
0 |
18 |
31 |
67 |
212 |
711 |
389 |
0 |
| VCDI |
0 |
0 |
0 |
32 |
94 |
1915 |
15290 |
8072 |
|
Date: 2025-10-25:
| 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 |
11484 |
4121 |
262 |
326 |
74 |
5 |
0 |
0 |
| OW |
0 |
236 |
109 |
234 |
147 |
24 |
6 |
0 |
| VODI |
0 |
106 |
67 |
219 |
377 |
79 |
19 |
0 |
| ODI |
0 |
9 |
25 |
122 |
198 |
205 |
20 |
0 |
| CDI |
0 |
0 |
2 |
77 |
258 |
817 |
206 |
0 |
| VCDI |
0 |
0 |
4 |
27 |
221 |
4470 |
14711 |
6599 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11484 |
4098 |
259 |
336 |
84 |
18 |
3 |
0 |
| OW |
0 |
259 |
112 |
214 |
140 |
22 |
16 |
0 |
| VODI |
0 |
105 |
63 |
222 |
318 |
76 |
16 |
0 |
| ODI |
0 |
10 |
28 |
110 |
260 |
223 |
20 |
0 |
| CDI |
0 |
0 |
3 |
100 |
263 |
828 |
245 |
0 |
| VCDI |
0 |
0 |
4 |
23 |
210 |
4433 |
14662 |
6599 |
|
Date: 2025-10-27:
| 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 |
11968 |
3408 |
169 |
218 |
66 |
1 |
0 |
0 |
| OW |
1 |
229 |
179 |
296 |
96 |
8 |
0 |
0 |
| VODI |
0 |
4 |
25 |
342 |
394 |
96 |
3 |
0 |
| ODI |
0 |
0 |
2 |
15 |
318 |
948 |
138 |
0 |
| CDI |
0 |
0 |
1 |
6 |
57 |
800 |
177 |
0 |
| VCDI |
0 |
1 |
1 |
1 |
20 |
2281 |
17625 |
5972 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11957 |
3255 |
159 |
299 |
143 |
20 |
6 |
0 |
| OW |
12 |
273 |
107 |
165 |
136 |
32 |
16 |
0 |
| VODI |
0 |
105 |
81 |
225 |
230 |
133 |
28 |
0 |
| ODI |
0 |
8 |
24 |
124 |
178 |
318 |
14 |
0 |
| CDI |
0 |
0 |
4 |
57 |
177 |
735 |
111 |
0 |
| VCDI |
0 |
1 |
2 |
8 |
87 |
2896 |
17768 |
5972 |
|
Date: 2025-10-29:
| 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 |
11402 |
3487 |
197 |
300 |
120 |
12 |
0 |
0 |
| OW |
0 |
206 |
123 |
318 |
156 |
22 |
0 |
0 |
| VODI |
0 |
32 |
42 |
320 |
312 |
142 |
10 |
0 |
| ODI |
0 |
2 |
8 |
38 |
314 |
372 |
57 |
0 |
| CDI |
0 |
0 |
0 |
14 |
112 |
991 |
379 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
41 |
1848 |
15893 |
8596 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11402 |
3283 |
187 |
328 |
197 |
35 |
6 |
0 |
| OW |
0 |
300 |
72 |
246 |
147 |
70 |
13 |
0 |
| VODI |
0 |
124 |
67 |
193 |
242 |
172 |
54 |
0 |
| ODI |
0 |
19 |
40 |
162 |
183 |
284 |
41 |
0 |
| CDI |
0 |
1 |
4 |
57 |
190 |
752 |
186 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
96 |
2074 |
16039 |
8596 |
|
Date: 2025-10-31:
| 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 |
10706 |
3947 |
211 |
242 |
72 |
4 |
0 |
0 |
| OW |
0 |
340 |
181 |
350 |
93 |
5 |
0 |
0 |
| VODI |
0 |
77 |
103 |
313 |
225 |
39 |
0 |
0 |
| ODI |
0 |
4 |
20 |
191 |
327 |
179 |
2 |
0 |
| CDI |
0 |
0 |
0 |
47 |
323 |
683 |
123 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
39 |
1564 |
11927 |
13529 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10706 |
3815 |
215 |
248 |
40 |
0 |
0 |
0 |
| OW |
0 |
370 |
135 |
288 |
176 |
18 |
0 |
0 |
| VODI |
0 |
151 |
118 |
293 |
254 |
126 |
29 |
0 |
| ODI |
0 |
28 |
28 |
138 |
264 |
199 |
38 |
0 |
| CDI |
0 |
4 |
18 |
113 |
246 |
575 |
123 |
5 |
| VCDI |
0 |
0 |
1 |
63 |
99 |
1556 |
11862 |
13524 |
|
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