BLOOMINGTON Temperatures are expected to reach 85 degrees Monday, but the mercury will steadily rise after that, resulting in highs of around 95 degrees by Wednesday and Thursday.

There is no rain in the forecast until Friday, said forecasters with The National Weather Service in Lincoln. Tuesdays high is expected to be 90 degrees.

The heat index values will range between 100 and 107 degrees Wednesday and Thursday.

It will cool off slightly on Friday, with a high near 90 degrees.

The Doppler radar at the NWS office in Lincoln will be offline on Monday and Tuesday, and perhaps into Wednesday, said NWS.

The $150 million investment is being made by the three organizations that use the radars the NOAA National Weather Service, United States Air Force and Federal Aviation Administration. The three other service life extension projects include refurbishing the transmitter, pedestal, and equipment shelters.

A crew will install a new signal processor, which replaces obsolete technology, improves processing speed and data quality, provides added functionality, and increases IT security, said the agency.

During the outage, radar coverage is available from adjacent radar sites, including Chicago, Davenport, Iowa, St. Louis, Paducah Ky., Evansville Ind. and Indianapolis.

On this date in 1903, several tornadoes moved across northern and Central Illinois during the late afternoon and early evening. The two most significant tornadoes touched down in LaSalle County, affecting the towns of Mendota and Streator. Ten people were killed by the two storms. Five of the deaths occurred at a race track, where people were taking shelter under a grandstand when it collapsed.

Follow Kevin Barlow on Twitter: @pg_barlow

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Heat wave to hit Central Illinois - Bloomington Pantagraph