Extreme Temperature Diary- Tuesday June 30th, 2020/ Main Topic: Low Level But Dangerous Heat Wave Begins In The United States

Tuesday June 30th… Dear Diary. The main purpose of this ongoing blog 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).😉

Main Topic: Low Level But Dangerous Heat Wave Begins In The United States

Dear Diary. We have made it to the last day of June without seeing a historic heat wave across the United States, being fortunate considering current global temperature averages. The first few days of July will not have much record heat either, but we do see signs that “typical” deadly heat is increasing, particularly across the Plains. As of this writing the area covered by heat advisories in the Plains is the most I’ve seen this warm season so far:

Heat and humidity will expand northward during the next week to encompass all of the Midwest and much of the East:

Currently across the Continental U.S. we have a relatively cool 500 millibar pattern:

As expected to develop, the most anomalous heat is building through central Canada where maxes in the 90s as far north as Hudson Bay in Ontario won’t be welcome. By this weekend the central Canadian heat dome will have built southward into much of the United States:

I’m not that impressed with the overall strength of the ridge forecast for this weekend, being well below 594 decameters, which is very common for July. We will see if further strengthening of the ridge continues towards very deadly levels around or just below 600 decameters as we get further into July. The blue areas on the National Weather Service 6-10 day outlook make since a cool trough is forecast to continue in the Pacific Northwest and in the Southeast through early next week.

On Wednesday we should see the following national temperature profile for maxes:

Dangerous but fairly typical heat should continue in Florida, the south-central states, and across the Gulf Coast. There maybe a smattering of record reports from these areas with nothing truly newsworthy or historic.

It will be very important to make sure that car passengers, including animals, are looked after just about anywhere that maxes are forecast to be above 80F. Remember during any summer season, hot cars kill.

Here is some advise we are seeing from the Dallas and New Orleans areas, which are cities that are all too familiar with wickedly hot summer heat:

As above average heat expands across the U.S. and Canada I’ll be including notes, and “ET” statements as usual, on the Extreme Temperature Diary on subsequent daily posts.


Here is a major “ET” from Tuesday:

Here is more climate and weather news from Tuesday:

(As usual, this will be a fluid post in which more information gets added during the day as it crosses my radar, crediting all who have put it on-line. Items will be archived on this site for posterity. In most instances click on the pictures of each tweet to see each article. The most noteworthy items will be listed first.)

Now here are some of today’s articles and notes on the horrid COVID-19 pandemic:

(If you like these posts and my work please contribute via the PayPal widget, which has recently been added to this site. Thanks in advance for any support.) 

Guy Walton “The Climate Guy”

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