Underground) – June will segue into July this weekend with much of
the central and eastern U.S. enduring a blistering, dangerous heat
wave that could extend into the July 4 holiday in some areas.
Excessive heat warnings were already in place Friday morning for
parts of 11 states from Kansas to Michigan, and heat advisories for
the upcoming onslaught extended all the way to Vermont.
low-level moisture—perhaps boosted by “corn
add to the misery of the high temperatures in many locations. The
heat index, a measure of the combined effects of heat and humidity,
was predicted to soar as
high as 120°F on
Friday and Saturday across parts of northern Illinois as dew point
temperatures approach 80°F. The heat index could be in the 105-110°F
range in the New York City area from Sunday into Tuesday.
record highs matched or toppled from Colorado to Scotland
dome of heat building into the Northeast U.S. gripped the Rockies on
Thursday. Denver’s high of 105°F on Thursday matched its all-time
high in data going back to 1872. The other dates that saw 105°F in
Denver were June 25 and 26, 2012; July 20, 2005; and Aug. 8, 1878.
Two other nearby cities set daily records that came within 1°F of
their all-time highs: Colorado Springs, CO (100°F) and Cheyenne, WY
(99°F). Amid the intense heat, a wildfire in the Sangre de Cristo
range of southern Colorado surged to envelop more than 14,000 acres
by Friday morning, closing a major travel route (U.S. Highway 160).
heat records will be a bit less likely across the central and eastern
U.S., but many daily record highs and record-warm minimums can be
expected. Triple-digit highs aren’t out of the question by Sunday
in upstate New York, where such readings are very uncommon. The last
got up to 100°F was on 3 September 1953.
of Europe are also suffering through an intense early-summer heat
wave, especially the United Kingdom. Thursday was the first
day since 2013 that
all four U.K. countries (England, Scotland, Wales, and Northern
Ireland) saw a temperature of at least 30°C (86°F). The airport
observing site at Scotland’s largest city, Glasgow, notched the
official temperature ever recorded Thursday:
31.9°C (89.4°F). It was so hot that a membrane on the roof of the
Glasgow Science Centre—designed to be “weatherproof”—began
The capital of Northern Ireland, Belfast, also broke its all-time
high on Thursday at the airport observing site, with a high of 29.5°C
(85.1°F) beating 29.4°C (84.9°F) from 10 July 1934. In western
Ireland, Shannon set its all-time high with 32.0°C (89.6°F).
According to weather records expert Maximiliano Herrera, the reading
at Shannon is the hottest temperature recorded anywhere in June in
Ireland since 1976. In July 2006, a temperature of 32.3°C was
recorded in Ireland.
dry conditions have paved the way for the heat across northwest
Europe. The Netherlands are expecting their driest
June on record,
with the De Bilt weather station now at a record-low June rainfall
total of 12.1 mm (0.48”). England’s “home counties”
surrounding London are on track to tie June 1925 as their driest
they’ve averaged just 3.3 mm (0.13”) for the month so far—about
6% of normal. Near Manchester, an unprecedented
burst of moorland fires is
ravaging the normally moist peat-bog countryside. […]
ozone pollution event underway
week’s heat wave is bringing the worst ozone air pollution thus far
this year to much of the Midwest and Northeast United States.
Action Day was
declared for 24 U.S. cities for Friday, including Cincinnati,
Detroit, Dayton, Denver, Indianapolis, Louisville, Baltimore,
Pittsburgh, St. Louis, and Salt Lake City. On Saturday, Ozone Action
Days are up for 18 cities, mostly in New Jersey and Utah. Ground
level ozone, which has
been blamed for approximately 12,000 premature deaths per
the U.S. between 2010 and 2016, is created from chemical reactions
between volatile organic carbon (VOC) compounds and nitrogen oxides
in the presence of sunlight. The chemical reactions that create ozone
happen faster at high temperatures, and the current heat wave can be
expected to cause one of the deadliest ozone pollution events of