Heat Wave!

A strong high pressure system located in the eastern US will help propel hot and humid air into the Midwest and Great Lakes/Plains. With the high pressure system’s distinctive clockwise flow, this creates a sort of conveyor belt of all things hot. Indicated here by the Climate Prediction Center, red values show temperatures above average, and blue below average.

Eastern two-thirds of the US showing a good chance of exceeding average high temperatures in the next 6-10 days.

From what I have gathered, seeing a 90 shaded region is pretty rare. This indicates the forecaster confidence in either above or below average temperatures. So there is a REALLY good chance we will be seeing above average temperatures coming up.

How hot? While we will top off in the mid to upper 90s, this becomes very dangerous factoring in humidity that will filter in as well. Heat indices will climb into the triple digits yet again this season, but instead of one or two days, this will be for a prolonged period.

Same deal, just for heat index.

The main threat from the weather set up is in the Plains and Mississippi Valley, where heat indices will push into the 110+ range. As the high pressure system moves in a southeasterly direction, note the movement of the heat on this animation.

Loop of Maximum Heat Index for July 19-23.

Heat like this is magnified in a sunlit car, be sure to remove pets or children from cars even if its for 5 minutes. Grabbing that Snickers bar from the dash may be a good idea as well. For more about the US’s #1 weather related killer take a look here.

Fun little fact about July 16th. Waaay back in 1980 a derecho event swept through lower Michigan. Cool enough, it looks very similar to the system that hit just last week. This one was much more significant however. Holy cow hand drawn weather maps!

July 16 1980 Derecho event.

It is a very good read, especially the storm reports:

“Intense downburst developed just west of Ann Arbor. Path of the most intense damage across southern Ann Arbor then eastward through the Downriver suburbs of Detroit. Winds estimated up to 100 mph in Washtenaw county, up to 150 mph in Wayne County. Innumerable buildings, vehicles and trees destroyed in eastern Washtenaw, central and southern Wayne, and northeastern Monroe counties. Several boats were swamped on the Detroit River. Power off in some areas up to ten days.”

Also ordered replacement parts for the Davis VantagePro2 weather station, so we will have live data once again! Excited to have that streaming again because it was both unique and fun to document weather data at home.

The weather station in front of some multiple cloud layers.


About gweatherc
Live in Michigan and enjoy observing the weather. Want to pursue it as a career! Currently taking classes at Central Michigan University.

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