Validation of sea ice concentration - European sector
Bulletin date: 2025-07-31
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-07-25:
| 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 |
83796 |
4429 |
16 |
17 |
0 |
0 |
0 |
0 |
| OW |
93 |
1485 |
276 |
425 |
9 |
0 |
0 |
0 |
| VODI |
0 |
86 |
170 |
1407 |
152 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
263 |
1073 |
202 |
4 |
0 |
| CDI |
0 |
0 |
0 |
2 |
981 |
4095 |
91 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
1219 |
124 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-27:
| 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 |
83987 |
4597 |
13 |
12 |
0 |
0 |
0 |
0 |
| OW |
16 |
1260 |
280 |
370 |
21 |
0 |
0 |
0 |
| VODI |
0 |
89 |
155 |
1398 |
205 |
2 |
0 |
0 |
| ODI |
0 |
0 |
0 |
217 |
1271 |
373 |
11 |
0 |
| CDI |
0 |
0 |
0 |
8 |
1223 |
3531 |
52 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
1277 |
48 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-29:
| 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 |
84644 |
4575 |
35 |
47 |
1 |
0 |
0 |
0 |
| OW |
4 |
1012 |
305 |
443 |
5 |
0 |
0 |
0 |
| VODI |
0 |
40 |
87 |
1250 |
141 |
0 |
1 |
0 |
| ODI |
0 |
0 |
0 |
116 |
2163 |
359 |
1 |
0 |
| CDI |
0 |
0 |
0 |
2 |
572 |
3414 |
140 |
1 |
| VCDI |
0 |
0 |
0 |
0 |
1 |
390 |
664 |
3 |
|
...date precedes bulletin
|
Date: 2025-07-31:
| 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 |
84171 |
5082 |
44 |
69 |
0 |
0 |
0 |
0 |
| OW |
0 |
1125 |
260 |
416 |
2 |
0 |
0 |
0 |
| VODI |
0 |
122 |
122 |
1046 |
180 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
111 |
2200 |
242 |
0 |
0 |
| CDI |
0 |
0 |
0 |
1 |
696 |
3288 |
27 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
1 |
1129 |
81 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
84170 |
5075 |
48 |
69 |
0 |
0 |
0 |
0 |
| OW |
1 |
1084 |
242 |
463 |
0 |
0 |
0 |
0 |
| VODI |
0 |
170 |
136 |
1004 |
192 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
103 |
2074 |
311 |
0 |
0 |
| CDI |
0 |
0 |
0 |
4 |
813 |
3211 |
26 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
1137 |
82 |
0 |
|
Date: 2025-08-02:
| 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 |
84495 |
4681 |
52 |
47 |
0 |
0 |
0 |
0 |
| OW |
168 |
1282 |
244 |
278 |
0 |
0 |
0 |
0 |
| VODI |
48 |
225 |
164 |
1023 |
41 |
1 |
0 |
0 |
| ODI |
0 |
1 |
4 |
222 |
1919 |
213 |
0 |
0 |
| CDI |
0 |
0 |
0 |
8 |
1290 |
2344 |
496 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
1017 |
153 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
84505 |
4677 |
59 |
46 |
0 |
0 |
0 |
0 |
| OW |
179 |
1230 |
255 |
329 |
0 |
0 |
0 |
0 |
| VODI |
27 |
282 |
144 |
1004 |
47 |
1 |
0 |
0 |
| ODI |
0 |
0 |
6 |
189 |
1867 |
317 |
0 |
0 |
| CDI |
0 |
0 |
0 |
10 |
1336 |
2177 |
486 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
1080 |
163 |
0 |
|
Date: 2025-08-04:
| 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 |
86533 |
3099 |
26 |
77 |
0 |
0 |
0 |
0 |
| OW |
179 |
1488 |
262 |
629 |
6 |
0 |
0 |
0 |
| VODI |
0 |
8 |
26 |
825 |
91 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
48 |
2795 |
11 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
641 |
2891 |
83 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
208 |
490 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
86454 |
2712 |
22 |
57 |
0 |
0 |
0 |
0 |
| OW |
258 |
1471 |
143 |
273 |
1 |
0 |
0 |
0 |
| VODI |
0 |
403 |
147 |
909 |
20 |
1 |
0 |
0 |
| ODI |
0 |
9 |
2 |
309 |
1829 |
171 |
0 |
0 |
| CDI |
0 |
0 |
0 |
31 |
1667 |
2654 |
251 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
16 |
284 |
322 |
0 |
|
Date: 2025-08-06:
| 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 |
86862 |
3004 |
46 |
39 |
0 |
0 |
0 |
0 |
| OW |
150 |
1824 |
130 |
470 |
9 |
0 |
0 |
0 |
| VODI |
0 |
115 |
89 |
600 |
136 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
132 |
2351 |
37 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1243 |
2672 |
58 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
311 |
137 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
86778 |
2594 |
31 |
15 |
0 |
0 |
0 |
0 |
| OW |
234 |
1690 |
94 |
278 |
1 |
0 |
0 |
0 |
| VODI |
0 |
638 |
116 |
588 |
80 |
0 |
0 |
0 |
| ODI |
0 |
21 |
24 |
326 |
1597 |
124 |
1 |
0 |
| CDI |
0 |
0 |
0 |
34 |
2056 |
2684 |
128 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
5 |
213 |
66 |
0 |
|
Date: 2025-08-08:
| 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 |
87005 |
3214 |
23 |
92 |
0 |
0 |
0 |
0 |
| OW |
214 |
1720 |
132 |
371 |
19 |
0 |
0 |
0 |
| VODI |
0 |
211 |
57 |
385 |
241 |
1 |
0 |
0 |
| ODI |
0 |
0 |
9 |
117 |
2046 |
39 |
0 |
0 |
| CDI |
0 |
0 |
0 |
1 |
803 |
2627 |
835 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
2 |
65 |
187 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
86797 |
2853 |
31 |
77 |
0 |
0 |
0 |
0 |
| OW |
360 |
1607 |
100 |
231 |
2 |
0 |
0 |
0 |
| VODI |
62 |
635 |
58 |
455 |
121 |
6 |
0 |
0 |
| ODI |
0 |
50 |
32 |
188 |
1332 |
165 |
0 |
0 |
| CDI |
0 |
0 |
0 |
15 |
1656 |
2526 |
940 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
35 |
82 |
0 |
|
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