Heat and humidity increase; Signs of cooler, less humid air arriving
Another warm and humid day goes in to the books. Highs were in the upper 80°s to lower 90°s today. Lincoln made it up to 93°, making this the 35th day to reach 90°. That is 6 days ahead of the 30-year year to date normal and the highest in three years.
The cold front that was moving towards the area has washed out, taking with it the chance for a thunderstorm this evening. Instead, it is going to remain mild and humid over night. Under mostly clear skies temperatures will drop to the middle 60°s to lower 70°s.
It will remain humid Wednesday – dew points in the 70°s – and the air temperature should tick up a few more degrees. Highs will be in the lower to middle 90°s. This will take heat indices to as high as 98° to 107° during the afternoon.
Because of this, the National Weather Service has extended the Heat Advisory for much of southeast Nebraska to Wednesday evening. I think we could see it extended in to Thursday as peak heat indices will again be around 105° or higher.
There is a break from the heat and humidity coming our way Friday. Upper-level high pressure will push back to the west and a cold front will pass through. Dew points will drop from the middle 70°s Thursday, to the low 60°s Friday, to the upper 50°s to around 60° this weekend.
As the upper-level high (also known as the “hot dome”) moves west, it will eastern Nebraska up for a pattern called the “Rim of Fire”. This is where thunderstorm complexes develop on the north, northeast, and eastern side of the upper-level hot dome. We would be in prime position for storms to develop over northern Nebraska/southern South Dakota and then dive south/southeast through eastern Nebraska Saturday night. It is something we’ll keep an eye on over the coming days.
– Chief Meteorologist John Dissauer