Heat wave abruptly ends in N.B.

The temperature climbed to 30 C for three days in a row in Greater Moncton which is an unofficial heat wave since 32 C is the maximum by definition.

Those warm daytime highs, 30.4 C (19 July), 30.4 C (20 July) and 30.0 C (21 July), still haven’t eclipsed the season-to-date maximum of 30.8 C recorded on 11 June.

A cold front moved west to east through New Brunswick yesterday triggering scattered thunderstorms with heavy rain, gusty winds and even hail.

The heat and humidity have been replaced by a cooler, drier air mass with highs in the low 20’s C which is slightly below normal for late July.

Decent first half of July

An ominous afternoon sky over Greater Moncton, 17 July 2017 (Dearing)


For whatever reason, summer seems to go by faster than the other seasons and here we are already at the midway point of July. 

After 16 days, Greater Moncton has been having a decent month with an average temperature of 19.3 C which is 0.5 degrees above normal. 

Daytime highs have been warm but not hot with a peak of 29.4 C on 16 July while overnight lows have been mild except for a chilly low of 8.9 C on  05 July. 

The only concern is a lack of rainfall. 

The tally is 19.8 mm so far – less than a quarter of the monthly total – but keep in mind we are entering what is traditionally the driest period of the year in Southeast New Brunswick. 

(Stats courtesy Environment Canada)

Heat warnings issued in the West

Heat west

Weather watches, warnings, statements re: heat and thunderstorms, 08 July 2017 (Environment Canada)

A strong ridge of high pressure over Western Canada has pushed the thermometer into record high territory for British Columbia and Alberta.

On 07 July, dozens of communities set new maximum temperatures with the highest at 39.4 C in Warfield and 38.3 C in Nelson but the hot spot in Canada was Garden River in northern Alberta at 40.3 C.

The major cities were warm too with Calgary reaching 33 C and Edmonton 30 C.

Heat warnings have been issued for most of Alberta and parts of Saskatchewan where temperatures will be near 29 C or higher for the next few days and residents are urged to take precautions.

Weather Network unveils summer forecast

2017summer
The Weather Network has released its summer 2017 forecast covering June, July and August.

A changeable summer is expected across Atlantic Canada with extended periods of above seasonal and below seasonal weather.

The southern Maritimes which includes Greater Moncton and Southeast New Brunswick and possibly into southern Newfoundland have the best chance of seeing temperatures tip to the warm side of normal.

Meanwhile, cooler than normal temperatures are expected to be more persistent across eastern Labrador and northern Newfoundland.

Near normal rainfall is expected this summer except for western and northern New Brunswick.

There is the potential for a couple of systems to tap into subtropical or tropical moisture and bring above normal rainfall to parts of the region.

2016 was warm in Greater Moncton

moncton2016seasons

Clockwise from top left: Jan 2016 Moncton, May 2016 Moncton, Aug 2016 Kouchibouguac N.P., Oct 2016 Moncton

The average annual temperature for 2016 in Greater Moncton was 6.4 C which was one degree above the 1981-2010 period according to data from Environment Canada.

Precipitation was below normal with 995 mm recorded (1200 mm is average over the same thirty years) broken down as 689 mm of rain and 297 cm of snow.

The highest temperature of the year was 30.5 C on 28 July while the lowest was -22.1 C recorded on 17 December.

The growing season stretched from mid-May to early October which gave Moncton about 142 frost-free days, slightly higher than the average of 127.

SW Nova Scotia hit by drought

ponddry

Dry pond, Arcadia, Yarmouth Co., NS, 14 Sept 2016 (Comeau/Yarmouth Vanguard)

While it has been dry this summer in parts of New Brunswick, no where has it been drier in the Maritimes than in southwest Nova Scotia.

Meteorologists say while the jet stream normally flows through the middle of the region providing adequate amounts of rain, it was pushed farther north this summer due to the Bermuda High which has been northwest of its usual position.

As a result, rainfall in northern New Brunswick has been above average while southwest Nova Scotia has only received 32 percent of its normal summer precipitation.

For example, Yarmouth had 87 mm of rain during June, July and August which is well below the average of 268 mm.

Emergency management officials say at least 1,000 households have run out of water and bottled water donations from major retailers are being shipped to affected communities.

August 2016 – Warm and humid

Irishtown

Irishtown Park Reservoir, 28 Aug 2016 (Dearing)

A warm, dry trend which began in July continued in August in Southeast New Brunswick.

Although the temperature only climbed above 30 C once, there were 20 days with highs between 25 and 30 C often with high humidity and the overall monthly average was almost one degree above normal.

Rainfall was actually slightly above normal although a single rain event on 17 August delivered 35.4 mm which was more than one third the monthly total.

AUGUST 2016 ALMANAC (at Greater Moncton International Airport, 1981-2010)

Average HIGH 25.0 C

Average LOW 13.2 C

AVERAGE 19.1 C (about 0.9 degrees ABOVE normal)

Extreme HIGH 30.2 C (10 August)

Extreme LOW 8.9 (28 August)

RAINFALL 95.6 mm (about 15 percent ABOVE normal)

(Data courtesy Environment Canada)

Mid-summer heat!

nbjuly14

NB daytime highs from Environment Canada, 14 July 2016

Greater Moncton has yet to reach 30 C this summer but warm, breezy conditions pushed the daytime high to 29 C today with winds gusting up to 72 km/h.

Many other New Brunswick locations surpassed 30 C with Bathurst climbing to 33 C which was the hot spot in Canada.

Temperatures were cooler along the Fundy coast with a maximum of 20 C in Saint John and 23.4 C on Grand Manan Island.

July cold snap ends

Perce Rock

A view of Percé Rock, Quebec, 09 July 2016 (Dearing)

Some claimed it was time to haul out the parkas again after five straight days with daytime highs failing to reach 20 C in Greater Moncton.

Keep in mind the average early July high is 25 C and recent daily maximums were barely climbing to 15 C.

Data shows this has been the coolest stretch in July in many years.

But grey skies are finally clearing and Environment Canada is forecasting highs at or slightly above normal over the next few days.

Cooler than normal in N.B.

Cloud

Evening sky in Moncton, 03 July 2016 (Dearing)

Greater Moncton typically reaches a daytime high of 25 C in early July but while it was 28 C yesterday, it was only 19 C today and perhaps slightly cooler tomorrow.

The below normal conditions – coming after several weeks of warm weather – are due to a chilly north wind and two low pressure systems merging over Atlantic Canada.

On a positive note, some needed rain is on the way after a recent dry spell in Southeastern New Brunswick.