Validation of sea ice concentration
Bulletin date: 2025-07-10
Model vs. observations, sea ice class contingency tables
Date: 2025-07-04:
| 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 |
79920 |
19887 |
14930 |
1076 |
179 |
73 |
219 |
0 |
| OW |
0 |
173 |
3450 |
2282 |
402 |
217 |
444 |
0 |
| VODI |
0 |
0 |
854 |
1508 |
778 |
566 |
1375 |
0 |
| ODI |
0 |
0 |
289 |
553 |
565 |
1049 |
3125 |
0 |
| CDI |
0 |
0 |
207 |
439 |
325 |
369 |
5139 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
9 |
21 |
7560 |
10860 |
|
...date precedes bulletin
|
Date: 2025-07-08:
| 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 |
80324 |
23554 |
14001 |
1080 |
190 |
61 |
199 |
0 |
| OW |
25 |
249 |
3647 |
1697 |
659 |
234 |
408 |
0 |
| VODI |
0 |
0 |
640 |
1358 |
1279 |
1106 |
1343 |
0 |
| ODI |
0 |
0 |
167 |
317 |
383 |
1311 |
2706 |
37 |
| CDI |
0 |
0 |
20 |
38 |
58 |
215 |
7310 |
2649 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
2 |
3621 |
7956 |
|
...date precedes bulletin
|
Date: 2025-07-10:
| 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 |
79711 |
24141 |
13749 |
1151 |
177 |
60 |
198 |
0 |
| OW |
12 |
675 |
3115 |
1954 |
547 |
210 |
500 |
0 |
| VODI |
0 |
29 |
857 |
1924 |
1269 |
890 |
1312 |
0 |
| ODI |
0 |
0 |
285 |
415 |
435 |
1196 |
2658 |
21 |
| CDI |
0 |
0 |
56 |
172 |
130 |
257 |
8304 |
3291 |
| VCDI |
0 |
0 |
0 |
2 |
3 |
4 |
2227 |
6907 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
79723 |
24169 |
14231 |
1190 |
195 |
67 |
230 |
0 |
| OW |
0 |
666 |
2753 |
1944 |
529 |
188 |
460 |
0 |
| VODI |
0 |
10 |
731 |
1859 |
1266 |
861 |
1276 |
0 |
| ODI |
0 |
0 |
273 |
439 |
428 |
1242 |
2706 |
24 |
| CDI |
0 |
0 |
74 |
186 |
143 |
257 |
7962 |
3762 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
2 |
2565 |
6433 |
|
Date: 2025-07-14:
| 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 |
79819 |
22520 |
15226 |
1499 |
266 |
85 |
239 |
0 |
| OW |
0 |
553 |
2647 |
2576 |
584 |
251 |
404 |
0 |
| VODI |
0 |
7 |
869 |
2926 |
1323 |
607 |
974 |
1 |
| ODI |
0 |
0 |
280 |
1038 |
1415 |
965 |
2014 |
12 |
| CDI |
0 |
0 |
118 |
268 |
136 |
275 |
8970 |
7924 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
924 |
1129 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
79819 |
22362 |
14638 |
1286 |
195 |
78 |
209 |
0 |
| OW |
0 |
664 |
3055 |
2739 |
639 |
236 |
401 |
0 |
| VODI |
0 |
54 |
1019 |
3018 |
1365 |
663 |
1018 |
0 |
| ODI |
0 |
0 |
344 |
1032 |
1400 |
893 |
2023 |
16 |
| CDI |
0 |
0 |
84 |
232 |
125 |
313 |
8737 |
7666 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
1137 |
1384 |
|
Date: 2025-07-16:
| 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 |
80274 |
22975 |
15500 |
1719 |
252 |
82 |
196 |
0 |
| OW |
0 |
354 |
3055 |
3847 |
703 |
288 |
374 |
0 |
| VODI |
0 |
0 |
357 |
2467 |
1421 |
706 |
868 |
0 |
| ODI |
0 |
0 |
19 |
428 |
900 |
1288 |
1873 |
0 |
| CDI |
0 |
0 |
0 |
75 |
113 |
750 |
11699 |
5449 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
607 |
205 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
80274 |
22303 |
13727 |
1187 |
175 |
67 |
149 |
0 |
| OW |
0 |
936 |
3542 |
2656 |
548 |
264 |
401 |
0 |
| VODI |
0 |
90 |
1242 |
3021 |
1104 |
576 |
959 |
0 |
| ODI |
0 |
0 |
348 |
1408 |
1292 |
1116 |
1724 |
0 |
| CDI |
0 |
0 |
72 |
264 |
269 |
1050 |
9991 |
5576 |
| VCDI |
0 |
0 |
0 |
0 |
1 |
41 |
2393 |
78 |
|
Date: 2025-07-18:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
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