Validation of sea ice concentration
Bulletin date: 2025-04-24
Model vs. observations, sea ice class contingency tables
Date: 2025-04-18:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
Date: 2025-04-22:
| 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 |
54286 |
20568 |
5076 |
2448 |
743 |
142 |
45 |
0 |
| OW |
0 |
77 |
581 |
1143 |
1043 |
357 |
203 |
1 |
| VODI |
0 |
0 |
181 |
538 |
956 |
917 |
1055 |
16 |
| ODI |
0 |
0 |
49 |
113 |
331 |
929 |
2022 |
110 |
| CDI |
0 |
0 |
39 |
43 |
205 |
1914 |
7713 |
727 |
| VCDI |
0 |
0 |
0 |
2 |
137 |
1364 |
25755 |
27015 |
|
...date precedes bulletin
|
Date: 2025-04-24:
| 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 |
54748 |
21189 |
5275 |
924 |
249 |
140 |
36 |
0 |
| OW |
0 |
77 |
1768 |
875 |
472 |
303 |
174 |
0 |
| VODI |
0 |
0 |
725 |
525 |
577 |
884 |
931 |
10 |
| ODI |
0 |
0 |
122 |
262 |
284 |
687 |
2541 |
79 |
| CDI |
0 |
0 |
29 |
78 |
260 |
1281 |
11615 |
818 |
| VCDI |
0 |
0 |
13 |
17 |
104 |
1006 |
23404 |
26362 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
54748 |
21209 |
5401 |
960 |
269 |
139 |
38 |
0 |
| OW |
0 |
57 |
1637 |
835 |
458 |
314 |
148 |
0 |
| VODI |
0 |
0 |
716 |
520 |
567 |
859 |
922 |
14 |
| ODI |
0 |
0 |
132 |
263 |
292 |
700 |
2752 |
105 |
| CDI |
0 |
0 |
33 |
87 |
257 |
1268 |
11897 |
860 |
| VCDI |
0 |
0 |
13 |
16 |
103 |
1021 |
22944 |
26290 |
|
Date: 2025-04-28:
| 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 |
54966 |
21559 |
5669 |
698 |
195 |
43 |
23 |
0 |
| OW |
0 |
129 |
1862 |
921 |
428 |
135 |
78 |
6 |
| VODI |
0 |
5 |
610 |
916 |
929 |
786 |
555 |
120 |
| ODI |
0 |
0 |
77 |
144 |
324 |
740 |
2292 |
395 |
| CDI |
0 |
0 |
11 |
73 |
72 |
248 |
9678 |
856 |
| VCDI |
0 |
0 |
0 |
9 |
28 |
77 |
18723 |
33595 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
54966 |
21474 |
5341 |
756 |
223 |
70 |
45 |
0 |
| OW |
0 |
154 |
1930 |
780 |
569 |
336 |
203 |
6 |
| VODI |
0 |
48 |
751 |
864 |
702 |
654 |
1028 |
214 |
| ODI |
0 |
17 |
160 |
236 |
355 |
573 |
2966 |
405 |
| CDI |
0 |
0 |
47 |
114 |
102 |
298 |
10630 |
1155 |
| VCDI |
0 |
0 |
0 |
11 |
25 |
98 |
16477 |
33192 |
|
Date: 2025-04-30:
| 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 |
54503 |
23266 |
3979 |
780 |
170 |
14 |
3 |
0 |
| OW |
0 |
218 |
1780 |
987 |
487 |
286 |
43 |
0 |
| VODI |
0 |
7 |
573 |
1237 |
828 |
834 |
413 |
8 |
| ODI |
0 |
0 |
98 |
338 |
449 |
1086 |
1777 |
61 |
| CDI |
0 |
0 |
18 |
211 |
343 |
882 |
12321 |
1149 |
| VCDI |
0 |
0 |
0 |
33 |
102 |
195 |
22369 |
26996 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
54503 |
22984 |
3928 |
992 |
269 |
98 |
14 |
0 |
| OW |
0 |
362 |
1591 |
888 |
564 |
537 |
185 |
3 |
| VODI |
0 |
84 |
713 |
991 |
630 |
841 |
996 |
64 |
| ODI |
0 |
56 |
167 |
428 |
472 |
879 |
2876 |
191 |
| CDI |
0 |
5 |
48 |
239 |
317 |
721 |
13601 |
873 |
| VCDI |
0 |
0 |
1 |
48 |
127 |
221 |
19254 |
27083 |
|
Date: 2025-05-02:
| 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 |
55411 |
24379 |
1866 |
597 |
120 |
12 |
3 |
0 |
| OW |
73 |
722 |
1428 |
906 |
654 |
181 |
94 |
1 |
| VODI |
33 |
132 |
898 |
1027 |
942 |
707 |
627 |
12 |
| ODI |
14 |
18 |
203 |
476 |
625 |
1204 |
2170 |
35 |
| CDI |
7 |
12 |
25 |
348 |
451 |
925 |
14683 |
297 |
| VCDI |
0 |
6 |
1 |
97 |
200 |
474 |
25846 |
19902 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
55417 |
23665 |
1989 |
973 |
498 |
93 |
31 |
1 |
| OW |
45 |
1121 |
1086 |
653 |
721 |
518 |
354 |
5 |
| VODI |
39 |
359 |
910 |
607 |
649 |
748 |
1241 |
23 |
| ODI |
17 |
93 |
309 |
456 |
445 |
780 |
2880 |
81 |
| CDI |
20 |
30 |
110 |
449 |
385 |
689 |
15013 |
368 |
| VCDI |
0 |
1 |
17 |
313 |
294 |
675 |
23904 |
19769 |
|
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