Simulation of maximum temperatures on July 3 from American (GFS) weather model at two meters above the ground. (University of Maine Climate Reanalyzer)
(This article, originally published Tuesday, was updated Wednesday to add all-time heat records at Mount Washington, N.H., and Tbilisi, Georgia set since Monday. On Thursday, the story was updated to include information on heat-related deaths in Canada and extraordinary heat in Siberia.)
From the normally mild summer climes of Ireland, Scotland and Canada to the scorching Middle East, numerous locations in the Northern Hemisphere have witnessed their hottest weather ever recorded over the past week.
Large areas of heat pressure or heat domes scattered around the hemisphere led to the sweltering temperatures. In Canada, CNN reports the heat is to blame for at least 17 death, mostly in and near Montreal, which endured record high temperatures.
In Northern Siberia, along the coast of the Arctic Ocean – where weather observations are scarce – model analyses showed temperatures soaring 40 degrees above normal on July 5, to over 90 degrees. “It is absolutely incredible and really one of the most intense heat events I’ve ever seen for so far north,” wrote meteorologist Nick Humphrey, who offers more detail on this extraordinary high-latitude hot spell on his blog.
European model analysis shows temperatures in northern Siberia along Arctic Ocean rising more than 40 degrees above normal early July 5. (WeatherBell.com)
No single record, in isolation, can be attributed to global warming. But collectively, these heat records are consistent with the kind of extremes we expect to see increase in a warming world.
Let’s take a tour around the world of the recent hot-weather milestones.
North America
A massive and intense heat dome has consumed the eastern two-thirds of the United States and southeast Canada since late last week. It’s not only been hot but also exceptionally humid. Here are some of the notable all-time records set:
[Oppressive heat dome engulfs the Northeast — and it will spread west this weekend]
Europe
Excessive heat torched the British Isles late last week. The stifling heat caused roads and roofs to buckle, the Weather Channel reported, and resulted in multiple all-time record highs:
- Scotland provisionally set its hottest temperature on record. The U.K. Met Office reported Motherwell, about 12 miles southeast of Glasgow, hit 91.8 degrees (33.2 Celsius) on June 28, passing the previous record of (32.9 Celsius) set in August 2003 at Greycrook. Additionally, Glasgow had its hottest day on record, hitting 89.4 degrees (31.9 Celsius).
- In Ireland, on June 28, Shannon hit 89.6 degrees (32 Celsius), its record.
- In Northern Ireland,
- Belfast hit 85.1 degrees (29.5 Celsius) on June 28, its record.
- Castlederg hit 86.2 degrees (30.1 Celsius) on June 29, its record
Eurasia
A large dome of high pressure, or heat dome, has persistently sat on top of Eurasia over the past week, resulting in some extraordinarily hot weather:
A GFS model shows a large upper-level high-pressure zone, or heat dome, over Eurasia on Monday. (TropicalTidBits.com)
Middle East
As we reported, Quriyat, Oman, posted the world’s hottest low temperature ever recorded on June 28: 109 degrees (42.6 Celsius).
These various records add to a growing list of heat milestones set over the past 15 months that are part and parcel of a planet that is trending hotter as greenhouse gas concentrations increase because of human activity:
- In April, Pakistan posted the hottest temperature ever observed on Earth during the month of 122.4 degrees (50.2 Celsius).
- Dallas had never hit 90 degrees in November before, but it did so three times in four days in 2017.
- In late October 2017, temperatures soared to 108 degrees in Southern California, the hottest weather on record so late in the season in the entire United States.
- On Sept. 1, 2017, San Francisco hit 106 degrees, smashing its all-time hottest temperature.
- In late July 2017, Shanghai registered its highest temperature in recorded history, 105.6 degrees (40.9 Celsius).
- In mid-July, Spain posted its highest temperature recorded when Cordoba Airport (in the south) hit 116.4 degrees (46.9 Celsius).
- In July 2017, Death Valley, Calif., endured the hottest month recorded on Earth.
- In late June 2017, Ahvaz, Iran, soared to 128.7 degrees Fahrenheit (53.7 Celsius) — that country’s all-time hottest temperature.
- In late May 2017, the western town of Turbat in Pakistan hit 128.3 degrees (53.5 Celsius), tying the all-time highest temperature in that country and the world-record temperature for May, according to Masters.
Read more
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(Correction: The original version of this post listed Belfast as part of Ireland. It is the capital of Northern Ireland, and this has been updated.)
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