Tag: wet

Ontario

Reinforcing Cold Shot & Wet Snow Risk for Southern…

A frosty Saturday night ahead across much of Southern Ontario. Pleasant conditions Sunday, give way to a pair of clipper systems to start the work week. 

It will be a cool and frosty Sunday morning across Southern Ontario. Sunny conditions, and light southwesterly winds, will allow temperatures to rebound in the afternoon.  The first of two clipper systems brings rain showers (beginning) Monday morning. Dreary and cool conditions continue through the afternoon. 

Frost advisory issued by Environment Canada Saturday night.

First Shot of Lake Effect Snow?

A clipper system will track through the Great Lakes late Tuesday through Wednesday. The passage of the low will be followed by a reinforcing shot of cold and dry air. Lake effect rainfall may bring graupel or hail to some locales in Central Ontario (Tuesday evening into Wednesday morning). Owing to, instability, and seasonably cold air building aloft.

Lake effect rainfall bands will transition to wet snowfall Wednesday night, Southeast of Lake Huron, and Georgian Bay.

A few wet centimetres may accumulate through Wednesday night. Especially across higher elevations. 

Seasonably cool air 1.5km above the surface, will support lake effect snow. Abundant dry air, warm ground temperatures, and a building area of high pressure, should mitigate any risk of significant accumulation. We will monitor the risk over the coming days. 

Ontario

Another Round of Severe Weather Targets Southern Ontario &…

Monday will be a pleasant seasonal day, dominated by high pressure and brilliant sunshine – across Southern Ontario & Quebec.

Wet, humid and stormy conditions start the week, with a risk of thunderstorms. Find out when and where.

SYNOPSIS:

Cloud, spotty showers, steady rainfall and humidity will make a return to Southwestern Ontario as early as tonight, with a warm front pushing northwards. Overspreading, the rest of Southern Ontario and Extreme Southern Quebec by Tuesday Morning.

Concurrently, an area of low pressure will strengthen along the Manitoba/Ontario border as it tracks towards Hudson Bay. 15-30mm of rainfall is expected in Northwestern Ontario. With wet snow mixing in across far Northern sections. 

2 WAVES OF PRECIPITATION

The first wave of precipitation will arrive overnight tonight into Tuesday morning across Southern Ontario, moving into Quebec by the morning – ending early afternoon. Some embedded heavy-downpours is expended in a swath from the shores of Lake Erie to Niagara. Elsewhere, expect light to moderate rainfall and predominantly cloudy, warm and humid conditions. Dry slot arrives in the late morning to afternoon.

We will be watching Southwestern Ontario closely Tuesday, as any clearing could further destabilize the atmosphere increasing the risk of evening thunderstorms ahead of the cold front.

SECOND WAVE; RISK OF ISOLATED SEVERE THUNDERSTORMS

Associated with a sharp cold front – along a developing strong area of low-pressure forecast to deepen as it tracks through Northeastern Ontario and Quebec.

SOUTHERN ONTARIO

Thunderstorms will develop ahead of a cold front Tuesday night, persisting into Wednesday morning from East of Georgian Bay through Southwest Ontario. Isolated severe storms are possible. Bringing isolated strong wind gusts and heavy downpours. 

SOUTHEASTERN QUEBEC

A risk of isolated severe thunderstorms develops for Extreme Eastern Ontario and Southeastern Quebec late Wednesday morning or early afternoon, ahead of a sharp cold front. The primary risk will be damaging winds and heavy downpours. Isolated supercell(s) cannot be ruled out in Southeastern Quebec, but the risk will largely depend on timing & clearing.

GUSTY WINDS

Gusty southwesterly winds of 40-60km/h will overspread the risk area Tuesday. Becoming northwesterly through Wednesday. The strongest wind gusts of 60-70km/h will remain draped across Central Quebec and Nova Scotia.

New Brunswick

[UPDATED] Unsettled Pattern Arrives in Eastern Canada

Unsettled week ahead for the Maritimes to Ontario, including Quebec.

A formidable late winter snow storm has dropped impressive snowfall totals across parts of the Canadian Prairies in recent days. The same storm system has weakened and stalled over the Great Lakes, while aiding in the formation of a new surface low that tracked into the Maritimes.

The newly-formed system tracked up the Eastern Seaboard concurrently as a trough sits over the Great Lakes, becoming a weather maker for much of Eastern Canada.

ONTARIO

Predominantly cloudy conditions, with periods of flurries and wet snow continues Thursday and Friday across Southern and Northeastern Ontario. Trace amounts are expected for most, but parts of Southwest Ontario and Eastern Ontario could see several day totals approach 10-20cm. Actual ground accumulation will be less considering melting and settling.

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A more substantial in addition to localized snowfall threat will develop Wednesday morning, spanning parts of southwest Ontario. As a result of moisture enhancement off of the Great Lakes and a stalled trough over the region. A few wet centimetres is likely to accumulate east of Lake Huron. The unsettled pattern continues into Wednesday, Thursday and perhaps Friday. 5-15 centimetres of accumulation spanning the work week is expected. Highest totals away from the lakeshore and in regions of higher elevation.

MARITIMES

A moisture-laden system approaching the Bay of Fundy will continue to spread snow and rain across the Maritimes. Moderate snowfall continues to impact central Nova Scotia, PEI and New Brunswick. An additional 3-8cm of wet snow is expected to accumulate today, before this low tracks north. Precipitation will likely end as rain showers as temperatures warm. The heaviest totals from this system will be across a swath of central New Brunswick where 15-20cm is expected.

A second powerful storm system is expected to develop Friday lasting into Sunday. Strong winds gusting 50-70km/h and heavy snowfall amounting to an additional 10-25cm will be a concern.

Snow is expected to begin across Nova Scotia and PEI, transitioning to rain as the warm sector of the storm continues north throughout the day Thursday. Highest accumulations are expected in Cape Breton. Elsewhere, several wet centimetres will fall before a changeover to rainfall. There is still some uncertainties in exact track of this system(s). Once forecast confident increases, we will publish a region specific forecast for the maritimes promptly.

Primarily snowfall is expected in central and northern New Brunswick, with a changeover to rainfall near the Bay of Fundy.

QUEBEC

Flurries and light snowfall continue in Southwestern Quebec. A retrograding coastal low moving west-wards towards the Saint Lawrence river Thursday into Friday morning, will being heavier snow to Southeast Quebec and the Eastern Townships. Total accumulations are expected to be in the 10-20cm range by Friday evening.

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