Sunday, March 22nd 2020, 10:21 am - Most of southern Ontario will be dry and cool Sunday, but an incoming stateside low will push snow into the southwest in the evening
Southern Ontario can expect much of the same conditions for Sunday – sunshine and chilly temperatures – but things will change come the evening hours. This is when a stateside low will move into the southwest and begin to spread snow and rain across much of the province through to the start of the week. Timing, details of what to expect, below.
- Temperatures remain below seasonal once again Sunday
- Snow moves into southwest Sunday evening, GTA through overnight hours, will switch to rain Monday
- Stay up-to-date on the weather ALERTS in your area
SUNDAY: SUNSHINE CHILL, BUT MESSY SYSTEM MOVES IN THE EVENING
Sunday will almost be a repeat performance of Saturday's conditions, as temperatures remain indentical but an incoming low will bring snow into the province starting in the evening hours.
Daytime highs will hover just above the freezing mark across the south, with perhaps a little more warmth in the southwest where temperatures will stay closer to 5°C.
The chilly air can be attributed to an Arctic high pressure, which has kept the skies clear for the weekend so far. This will change into the evening, as a system crossing through the U.S. begins to make its effects felt in Ontario, beginning in the southwest.
MONDAY AND BEYOND: MESSY START, TEMPERATURES WILL GET A BOOST
Precipitation will first move into the extreme southwest Sunday evening, reaching the Greater Toronto Area in the overnight hours.
By early Monday morning, snow will shift to a rain/snow mix along the Highway 401 corridor, from Belleville to Hamilton, while precipitation will remain as rain in the Niagara area and south of the 401 along Lake Erie to Chatham-Kent and a rain-snow mix north of the highway in the southwest.
By the late morning, the switchover to rain will have already occurred in the GTA and will have moved out of the southwest, though snow or a rain/snow mix will continue a bit longer for areas east. It'll all be over for the GTA by the afternoon, ending in the east through the evening hours.
Accumulations will depend on elevation and distance to the lake shore. Currently, less than 2 cm will fall for the southwest and most of the GTA, with some 3-5 cm at higher elevations for most of the rest of the province. The heaviest amounts, 5-10 cm, are likeliest for parts of eastern, central Ontario away from Lake Ontario and the Ottawa River.
The rest of the week seems to feature an unsettled pattern with multiple systems that could impact the region late week and into the weekend.
Stay tuned to The Weather Network as we continue to update the forecast details.