Extreme Temperature Diary- June 30, 2018/ Hot Topic: Historic U.S. Heat Wave Day Three

Saturday June 30th… Dear Diary. The main purpose of this ongoing post will be to track United States extreme or record temperatures related to climate change. Any reports I see of ETs will be listed below the main topic of the day. I’ll refer to extreme or record temperatures as ETs (not extraterrestrials)😊. Here is today’s main climate change post related hot topic:

Historic U.S. Heatwave Day Three

Overnight models and trends have not changed that much in association with a long lived heat wave now building along the Atlantic Seaboard. To recap what happened yesterday here are Friday’s maxes:

Dangerous heat was occurring from Minnesota to the Mexican border.

Today there are large “Keep the Families Together” immigrant matches occurring. I noticed uncomfortable conditions for the marchers in large cities across the Northeast. Thankfully rallies won’t be occurring in the Northeast tomorrow since maxes in the Megalopolis area will be around the century mark with heat indices above 105F in some instances:

There is some good news here in the a front will slice some of the heat out of the north and central Plains.

In eastern Canada:

Both and are predicted to have their hottest Canada Day (July 1) on record, with muggy temps possibly topping 35C (95F).

Here is the forecast 500 millibar extent and orientation of the heat ridge by its apex on Friday 7/6 from the latest 12Z SAT 6/30 model run:
The ridge will probably retrograde far enough west for the Northeast to catch a break from a front by next weekend, but the entire coming week will see prolonged heat in the Megalopolis area, a phenomenon most residents are not used to.
It’s interesting that the worst effects from this heat wave, so far, are across the north and central part of the U.S. and not the traditionally hot southern tier of states. This trend should continue during the coming week looking at 850 millibar temperature anomalies:
I issued this climatological note this morning:

From the database the U.S. is on track to tally the fewest # of record low minimums for consecutive months since OCT-NOV 1922. We’ll be watching to see if totals for MAY-JUN 2018 don’t surpass those of OCT-NOV 2016, the prior two months for attaining this stat.

Here are Saturday’s Maxes:
There was not quite so much extreme heat in the Midwest as on Thursday or Friday due to a front pressing southeast through the northern Plains. Saturday was the first day of oppressive heat in the Northeast from the current heat wave.

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The Climate Guy

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