| Area | Forecast Region |
| 411 | Simcoe – Delhi – Norfolk |
| 412 | Dunnville – Caledonia – Haldimand |
| 413 | Sarnia – Lambton |
| 414 | Windsor – Essex – Chatham-Kent |
| 415 | London – Middlesex |
| 416 | Elgin |
| 417 | Oxford – Brant |
| 431 | City of Toronto |
| 432 | York – Durham |
| 433 | Belleville – Quinte – Northumberland |
| 434 | Stirling – Tweed – South Frontenac |
| 435 | Kingston – Prince Edward |
| 436 | Brockville – Leeds and Grenville |
| 437 | Cornwall – Morrisburg |
| 441 | Barrie – Orillia – Midland |
| 442 | Burk’s Falls – Bayfield Inlet |
| 443 | Algonquin |
| 444 | Parry Sound – Muskoka |
| 445 | Haliburton |
| 446 | Bancroft – Bon Echo Park |
| 447 | Peterborough – Kawartha Lakes |
| 451 | Prescott and Russell |
| 452 | Renfrew – Pembroke – Barry’s Bay |
| 453 | Smiths Falls – Lanark – Sharbot Lake |
| 454 | City of Ottawa |
| 461 | City of Hamilton |
| 462 | Grey – Bruce |
| 463 | Huron – Perth |
| 464 | Waterloo – Wellington |
| 465 | Dufferin – Innisfil |
| 466 | Halton – Peel |
| 467 | Niagara |
