Wet and Cool Weekend for the Great Lakes While it remains Hot over the Southwest
Category: Heat Wave
July CONUS Weather Summary
Record to near record heat over the Southwest CONUS and parts of Florida, while the Midwest and Great Lakes was cooler and wetter than normal. Grand Rapids Michigan had it’s coolest month, relative to normal since April 2022!
Looks Warm with showers and storms into midweek, than dry and not as warm the second half of this week (over Michigan)
An Extended Period of Hot and Humid Weather is Expected for Most of the Central and Eastern CONUS Next Week (June 16-22).
Enjoy the warm weather this week because it will get much colder next week and parts of Michigan may even see their first snowfalls by Tuesday. Happy Halloween!
This shows our transition point from warmer to cooler weather.
At the risk of going overboard on the Summer of 2023, I have another set of charts you may want to look at.
I through it would be fun and informative to see the frequency for hot days across our Nation.
Here I have the frequency for highs in the 90s across the CONUS (Continental United States), the longest streak across the CONUS, the frequency of lows of 70 or more and I few more NCEI charts to show how hot of a summer this was both nationally and regionally. I also have a few precipitation maps so you can see that the great frequency for hot weather was were it rained less, relative to normal for that area.
I have added 2 slides to this presentation ( 8 and 9). These two slides show that what one uses for the “normal”, greatly impacts what the departure from normal looks like. I used 1991 to 2020, the official NWS normal period for the image on the top left, then 1895 to 2000 for the image on the top right, not the area of below normal is significantly less. That is because the period 1991 to 2020 was warmer than the 1895 to 2000 period. On the bottom left the mean is 1895 to 2020, that has no below normal areas. This seems questionable to me since the ranked normal’s on the next slide look a lot like the 1895 to 2000 on slide 8. I added this because I was getting some questions on this matter. I hope this helps.
Here is my updated version of the summer of 2023 climate. I have added some details on Southwest Michigan including the severe weather events this summer. I have also added slides on the large scale pattern, that is our transition from La Nina this past winter to El Nino this summer. This lead to persistent blocking over North America, which is why there were persistent heat over the south and wet weather over the eastern 1/3 of the CONUS.
This was a summer that featured persistent weather patterns over most of North America and lead to one of the most active Canadian wildfire seasons on record. It also lead the the 15th warmest summer on record (back to 1895) over the CONUS.
The second and third week of July have been cooler than normal, however, during the fourth week of July a heat wave (3 days or more in a row with highs of 90 or more) is expected for Southwest Lower Michigan. Don’t get to use to that through, cooler temperatures return by the 1st of August.
It’s been cool for the 2nd and 3rd week of July, however a dramatic change to hot weather is expected from Wednesday through Saturday.
themarinocast 