Extreme Temperature Diary-October 8, 2019/Review Of Record Early Fall Heat Via Climate Central

Tuesday October 8th… 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).😉

Review Of Record Early Fall Heat Via Climate Central

Dear Diary. Today we learned from The National Center for Environmental Information that September 2019 was the second warmest on record since 1895 for the lower 48 states. Top honors go to September 1998.

Amazing record heat across most of the southern and midwestern states played a large role in bringing averages up to extreme top levels.

Let’s not forget about precipitation in September. A “flash drought” accompanied record warmth in the Southeast:

As far as record warmth goes, what happened in September and early October are more clear signs that global warming is steadily shifting our climate away from traditional norms. The early fall exceptional heat was uncanny going into October. For example:

NCEI has yet to give us the bulk of record numbers coming from the big fall heat wave, but Climate Central has gone ahead and written an initial assessment, which I am reposting here:

https://www.climatecentral.org/gallery/graphics/2019-fall-record-heat

2019 Fall Record Heat

  • Published: October 7th, 2019

With the recent record-breaking heat, Climate Central takes a look at record high temperatures compared to record low temperatures across the United States.

The first week of October, cities from New Orleans,  to Washington, D.C. were settingnew high temperature records for the month, just days after places in Montana and Wyoming experienced record amounts of snowfall. School was canceled in Columbus, Ohio, as many buildings lacked the air conditioning needed to give students a break from the extremely high heat and humidity. The astounding wave of extreme heat is not only above normal, but has been smashing long-held records. September was the 2nd hottest September on record for the U.S., and the first week of October continued that warming trend, with dozens of monthly October high temperature records shattered by several degrees.

There have always been swings between hot and cold weather. In a stable climate, these rounds of hot and cold would balance out over time. However, that is not happening, due to the warming from increasing concentrations of greenhouse gas pollutants. The warming has led tomore extreme hot temperatures and milder minimum temperatures, so that record high temperatures are now outpacing record lows.

To illustrate this, Climate Central expanded ourAugust analysis of local daily temperature records to the national level. The temperature records are presented as the percentage of record hot temperatures compared to the percentage of record cold in each decade.

Some noteworthy records across the U.S. this year: 

  • September: 2,740 daily temperature records were set; 97% of which (2,655) were highest maximum records compared to 3% (85) lowest minimum records
  • September: 244 monthly temperature records were set; 98% of which (240) were highest maximum records compared to 2% (4) lowest minimum records
  • From September 1 through October 7 (viaNCEI Daily Weather Records tool):
    • 20 of our 244 stations established 10+ daily record highs, 28 had at least 7 days of record highs
    • Birmingham, Ala. Dothan, Ala., and Macon, Ga., set a daily record high for 10 consecutive days or more
    • On October 2, 70 of our stations (29%) set a record high
  • Globally:Data from the Copernicus program indicate that September 2019 was “virtually on a par with 2016” for the warmest September on record globally. NOAA and NASA global temperatures will be released later this month.

Extreme heat is thedeadliest form of extreme weather in the United States, outpacing flooding and causing more deaths than tornadoes and hurricanes combined. Extreme heat is especially risky for vulnerable communities and relatively cooler climates, where risk perception and preparedness is generally lower. It also compounds the impacts of rainfall shortages—leading to flash drought in much of the Southeast and exacerbating the risk of wildfires.

METHODOLOGY: US records are based on data compiled from NOAA/NCEI by former Weather Channel meteorologist Guy Walton, who maintains a comprehensive records database, analyzing monthly, annual, and decadal records trends. 

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Hopefully within the next few days NCEI will have updated record count totals since the last update of 9/26. When they do I will present my monthly “Record Scoreboards.”

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.)

(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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