Heat & high humidity trigger severe weather

Severe weather north of Moncton, 29 July 2020 (Dearing)

Yet another three-day heat warning has been lifted in Southeast New Brunswick but the high humidity has stuck around.

Severe thunderstorm watches have been issued periodically over the last few days as storm cells move across the province.

Greater Moncton has been missing most of the activity which has tended to either track to the north or south of us.

Environment Canada warns severe storms can produce heavy rain, damaging wind gusts and large hail.

Finally some rain!

Radar image showing thunderstorms across NB, 02 July 2020 (Environment Canada)

A cold front moved across New Brunswick on Thursday bringing thunderstorms with much needed rain and ushering out the heat and high humidity.

The temperature climbed to 30°C in Greater Moncton during the noon hour but dropped to 22°C by 2pm and 17°C by 6pm.

A severe thunderstorm watch was posted for a couple hours and 16 mm of rain fell which was good news considering the current drought conditions.

The last decent rainfall was on 12 June when 21 mm fell.

Environment Canada is forecasting possible showers or thundershowers this weekend.

Early heat wave

A fine day at Aboiteau Beach, Cap-Pele, NB, 27 July 2019 (Dearing)

A heat warning has been issued for most of New Brunswick with Environment Canada forecasting highs in the mid-30s Celsius over the next few days.

Humidex values could reach 40 and overnight lows near 20°C won’t provide much relief.

Extreme heat like this is more typical of July and August.

It’s possible new record highs will be set as current maximums range from 31-33°C in Greater Moncton this week.

If you’re seeking an escape from the heat, the Fundy coast will be about 10 degrees cooler than inland areas.

Erin drenches Maritimes

Post-tropical depression Erin interacted with an incoming low pressure system to produce lots of rain in the Maritimes.

Environment Canada says the heaviest amounts were recorded in northern Nova Scotia and the Annapolis Valley – Parrsboro and Greenwood each had more rain from this storm than all of July and August combined.

Some roads were damaged and even washed out by surface runoff or flooding.

Erin’s direct path along Nova Scotia’s south shore produced wind gusts up to 80 km/h.

The storm brought tropical air with a high of 23°C in Greater Moncton on Friday but a humidex of 32.

Rainfall totals (mm):

  • Parrsboro 162
  • Greenwood 127
  • Kentville 115
  • Summerside 67
  • Fredericton 56
  • Moncton 50
  • Halifax (city) 48

(Data courtesy Environment Canada)

Quiet forest fire season in N.B.

Forest Fire

Forest fire near River Glade, NB, 07 May 2013 (Dearing)

A wet, cold spring and a dry, humid July have led to one of the quietest forest fire seasons in recent memory in New Brunswick.

Statistics show 152 fires for the season to date which compares to 206 fires over the past ten years.

Last year was also much busier with 242 fires recorded by the middle of August.

Provincial wildfire officials say although July was warmer than normal, high humidity levels helped prevent fires from starting and from spreading.

Heat building in the Maritimes

Beach

A fine day at Aboiteau Beach, Cap-Pele, NB, 27 July 2019 (Dearing)

A heat warning has been in place since the start of the weekend in much of New Brunswick, Nova Scotia (except for Cape Breton) and Prince Edward Island.

In Greater Moncton, the temperature climbed to 30 C on Saturday and 29 C today but the forecast calls for 30 C on Monday and 31 C for Tuesday and Wednesday.

Overnight lows are not expected to drop that much either hovering around 18 to 19 C.

While humidity has been relatively low this weekend at around 50 percent or less, Environment Canada says the warm air mass will become more humid this week.

The only relief will be along the Fundy coast where temperatures will stay in the low 20s.

Thunderstorms cool off Eastern Canada

Thunderstorms rolling across Southern Ontario and Southern Quebec this weekend brought an end to oppressive heat and humidity.

Toronto residents were trying to keep cool Saturday when the mercury soared to 33.0°C with a stifling humidex of 44 and Montreal reported similar conditions.

In the Maritimes, even typically cooler coastal areas were warm with new record highs set in Saint John and Grand Manan.

The temperature in Greater Moncton peaked at 32.4°C which fell short of the record of 33.5°C from 1991.

A brief, violent thunderstorm hit Halifax on Sunday afternoon with flash flooding and strong winds knocking out power to more than 44,000 Nova Scotians.

Here comes the heat!

The view from Economy Point, NS, 03 July 2019 (Dearing)

After a cool and wet start to summer, a blast of heat is heading to the Maritime Provinces over the next few days.

Environment Canada has issued heat warnings for most of New Brunswick – excluding the Fundy coast – and western Nova Scotia while other areas under a special weather statement.

A warm, humid air mass is moving into the region today raising daytime temperatures to 30°C or more.

Humidex values near 40 are expected and overnight lows may not fall below 18°C providing little relief from the heat.

Near normal values will return late Saturday as a cold front arrives.

Heat warnings are also in place for parts of Ontario and Quebec where it climbed into the low 30s yesterday.

The heat returns!

Countryside near Victoria-by-the-Sea, PEI, 23 July 2018 (Dearing)

Another round of very warm temperatures and high humidity has enveloped almost all of the Maritimes with only New Brunswick’s Fundy coast exempt from an Environment Canada heat warning.

While actual daytime highs will approach 30 C, humidex values will range between 35 and 40 which can be dangerous for those at risk including young children, seniors and anyone with a chronic illness.

Forecasters say some relief may come on Thursday with some much needed rain but high humidity could persist until early next week.

Heat warning!

Bouctouche Dunes coastline, NB, 01 July 2018 (Dearing)

Record highs could be broken in Greater Moncton over the next couple of days if forecast highs in the low to mid 30s C are reached on Tuesday and Wednesday.

Environment Canada has issued a rare heat warning for New Brunswick, mainland Nova Scotia and Prince Edward Island with cooler conditions along the coast.

A warm, humid airmass is expected to push humidex values about 40 during the day and barely falling below 18 C at night – dangerous levels for those susceptible to heat.

Forecasters believe warm, humid weather will persist until later this week when a cold front brings temperatures closer to normal for the weekend.