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.

Latest Ndfd Heat Index

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.

Heat Advisory

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.

7 Day Ecmwf Dew Point Meteogram

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.

Latest Ecmwf 500mb And Temp

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

Categories: Channel 8 Eyewitness News Weather, Forecast