Validation of sea ice concentration - American sector
Bulletin date: 2025-05-22
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-05-16:
| 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 |
0 |
103 |
2 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
235 |
21 |
44 |
5 |
0 |
2 |
0 |
| VODI |
0 |
127 |
64 |
141 |
159 |
42 |
18 |
0 |
| ODI |
0 |
48 |
34 |
216 |
342 |
137 |
93 |
0 |
| CDI |
0 |
38 |
25 |
120 |
441 |
965 |
952 |
1 |
| VCDI |
0 |
129 |
15 |
145 |
362 |
2783 |
26198 |
11859 |
|
...date precedes bulletin
|
Date: 2025-05-18:
| 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 |
0 |
116 |
15 |
9 |
1 |
0 |
0 |
0 |
| OW |
0 |
200 |
38 |
58 |
16 |
1 |
0 |
0 |
| VODI |
0 |
138 |
57 |
196 |
139 |
45 |
19 |
0 |
| ODI |
0 |
72 |
60 |
220 |
336 |
146 |
107 |
1 |
| CDI |
0 |
35 |
41 |
160 |
416 |
872 |
994 |
144 |
| VCDI |
0 |
2 |
5 |
101 |
268 |
3378 |
25938 |
11522 |
|
...date precedes bulletin
|
Date: 2025-05-20:
| 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 |
0 |
190 |
11 |
9 |
1 |
0 |
0 |
0 |
| OW |
0 |
284 |
27 |
26 |
12 |
3 |
1 |
0 |
| VODI |
0 |
195 |
138 |
226 |
101 |
53 |
10 |
0 |
| ODI |
0 |
18 |
47 |
258 |
340 |
172 |
32 |
0 |
| CDI |
0 |
12 |
17 |
115 |
428 |
1389 |
616 |
11 |
| VCDI |
0 |
10 |
6 |
41 |
163 |
2679 |
23601 |
14624 |
|
...date precedes bulletin
|
Date: 2025-05-22:
| 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 |
0 |
244 |
13 |
5 |
1 |
1 |
0 |
0 |
| OW |
0 |
312 |
34 |
45 |
15 |
8 |
5 |
0 |
| VODI |
0 |
265 |
127 |
234 |
129 |
54 |
16 |
0 |
| ODI |
0 |
51 |
67 |
290 |
294 |
156 |
56 |
0 |
| CDI |
0 |
25 |
47 |
213 |
432 |
1303 |
799 |
142 |
| VCDI |
0 |
10 |
7 |
69 |
205 |
2449 |
27101 |
10642 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
277 |
17 |
10 |
1 |
2 |
0 |
0 |
| OW |
0 |
270 |
29 |
45 |
15 |
8 |
4 |
0 |
| VODI |
0 |
273 |
118 |
210 |
120 |
47 |
17 |
0 |
| ODI |
0 |
47 |
73 |
287 |
281 |
167 |
58 |
0 |
| CDI |
0 |
32 |
53 |
227 |
457 |
1347 |
724 |
169 |
| VCDI |
0 |
8 |
5 |
77 |
202 |
2400 |
27174 |
10615 |
|
Date: 2025-05-24:
| 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 |
0 |
337 |
13 |
6 |
2 |
0 |
0 |
0 |
| OW |
0 |
317 |
52 |
68 |
29 |
9 |
2 |
0 |
| VODI |
0 |
299 |
135 |
286 |
169 |
77 |
18 |
0 |
| ODI |
0 |
84 |
71 |
229 |
300 |
219 |
80 |
0 |
| CDI |
0 |
40 |
56 |
279 |
404 |
1349 |
736 |
0 |
| VCDI |
0 |
12 |
7 |
56 |
237 |
3153 |
28239 |
8496 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
358 |
20 |
15 |
2 |
0 |
0 |
0 |
| OW |
0 |
282 |
48 |
61 |
30 |
12 |
1 |
0 |
| VODI |
0 |
309 |
127 |
245 |
173 |
65 |
17 |
0 |
| ODI |
0 |
80 |
71 |
245 |
297 |
213 |
77 |
0 |
| CDI |
0 |
48 |
59 |
291 |
410 |
1399 |
753 |
1 |
| VCDI |
0 |
12 |
9 |
67 |
229 |
3118 |
28227 |
8495 |
|
Date: 2025-05-26:
| 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 |
0 |
375 |
12 |
6 |
0 |
0 |
0 |
0 |
| OW |
0 |
545 |
111 |
97 |
15 |
6 |
2 |
0 |
| VODI |
0 |
253 |
135 |
420 |
216 |
65 |
7 |
0 |
| ODI |
0 |
35 |
31 |
215 |
417 |
295 |
44 |
0 |
| CDI |
0 |
36 |
47 |
177 |
673 |
1596 |
977 |
0 |
| VCDI |
0 |
15 |
5 |
21 |
184 |
4699 |
26349 |
7785 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
385 |
20 |
20 |
5 |
2 |
0 |
0 |
| OW |
0 |
278 |
56 |
77 |
35 |
20 |
5 |
0 |
| VODI |
0 |
362 |
125 |
246 |
187 |
127 |
25 |
0 |
| ODI |
0 |
129 |
59 |
230 |
310 |
224 |
89 |
0 |
| CDI |
0 |
83 |
60 |
276 |
574 |
1234 |
1285 |
0 |
| VCDI |
0 |
22 |
21 |
87 |
394 |
5054 |
25975 |
7785 |
|
Date: 2025-05-28:
| 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 |
0 |
385 |
11 |
1 |
0 |
0 |
0 |
0 |
| OW |
0 |
660 |
122 |
129 |
36 |
7 |
0 |
0 |
| VODI |
0 |
308 |
136 |
349 |
263 |
66 |
1 |
0 |
| ODI |
0 |
46 |
50 |
263 |
370 |
229 |
33 |
0 |
| CDI |
0 |
53 |
31 |
221 |
1032 |
2196 |
1087 |
0 |
| VCDI |
0 |
24 |
18 |
165 |
2025 |
3872 |
24466 |
7211 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
356 |
16 |
12 |
2 |
0 |
0 |
0 |
| OW |
0 |
291 |
65 |
126 |
62 |
16 |
0 |
0 |
| VODI |
0 |
471 |
104 |
239 |
267 |
92 |
4 |
0 |
| ODI |
0 |
177 |
74 |
279 |
336 |
231 |
59 |
0 |
| CDI |
0 |
124 |
86 |
288 |
798 |
1758 |
2620 |
0 |
| VCDI |
0 |
57 |
23 |
184 |
2261 |
4273 |
22904 |
7211 |
|
Date: 2025-05-30:
| 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 |
0 |
331 |
21 |
10 |
1 |
0 |
0 |
0 |
| OW |
0 |
726 |
108 |
130 |
32 |
6 |
0 |
0 |
| VODI |
0 |
407 |
122 |
323 |
262 |
77 |
10 |
0 |
| ODI |
0 |
97 |
70 |
205 |
454 |
256 |
71 |
0 |
| CDI |
0 |
54 |
45 |
252 |
1005 |
2810 |
1725 |
1 |
| VCDI |
0 |
52 |
44 |
219 |
516 |
7339 |
21408 |
6677 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
353 |
54 |
47 |
20 |
5 |
0 |
0 |
| OW |
0 |
280 |
61 |
148 |
115 |
48 |
6 |
0 |
| VODI |
0 |
531 |
91 |
267 |
239 |
119 |
38 |
0 |
| ODI |
0 |
229 |
76 |
183 |
322 |
197 |
108 |
0 |
| CDI |
0 |
206 |
81 |
259 |
910 |
2635 |
2897 |
16 |
| VCDI |
0 |
68 |
47 |
235 |
664 |
7484 |
20165 |
6662 |
|
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