Forecast Change: More Showers, Heavier Precipitation Than Initially Expected Today

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Partly Sunny and Hot morning with growing cumulus clouds before rain started. Thermometer hit 87 degrees by 9:52 a.m. Monday, July 15, 2013.

Weather radar [LIVE RADAR] showers an area of showers and thunderstorms developing near O’Hare International Airport and Chicago’s West Side, and moving north. Radar was all clear for northeast Illinois at 10:40 AM, but by 11:40 a.m. multiple thundershower cells were developing and moving north.

PICTURES AND RADAR/GROWING CUMULUS AND RAIN: Precipitation developed by O’Hare and moved north by 11:40 am. No thunder, but decent amount of rain (see pics and radar) …

Unstable air with convection is moving north in to northeast Illinois and it appears that a convergence line clashing with the lake breeze area of Lake Michigan may cause showers and thunderstorms to continue to develop today.

Morning clouds showed a lot of cumulus development with convection in the area.

The highest temperatures today are expected between 1:00 p.m. and 4:00 p.m. but with added rain we may stay in the low 90s or upper 80s.

TODAY
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90. Heat index values as high as 95. East wind 10 to 15 mph.

Tonight
Partly cloudy, with a low around 73. East wind around 5 mph becoming south in the evening.

Tuesday
Mostly sunny, with a high near 91. Heat index values as high as 97. Southwest wind 5 to 10 mph.

Tuesday Night
Mostly clear, with a low around 74. West southwest wind 5 to 10 mph.

Wednesday
Mostly sunny, with a high near 93. West wind 5 to 10 mph.

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