By Tammie Souza

CHICAGO (CBS) — There is a risk of severe storms on Tuesday afternoon and evening.

This is dependent on moisture content in the air, and it could be an all-or-nothing event.

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If there is not enough moisture for instability, there will likely be few or no storms. But if there is enough moisture, any storm could turn severe.

Severe Weather Outlook: 09.06.21

(Credit: CBS 2)

There is a slight risk of severe storms – Level 2 of 5 – for areas east of a line from Waukegan to Morris, including the Chicago metro.

Severe Threat: 09.06.21

(Credit: CBS 2)

There is a marginal risk of severe storms – a level lower – west of the line from Waukegan to Morris.

From 3 p.m. to 8 p.m. Tuesday, a line of strong storms could form north of the area and travel to the southeast. Timing could shift depending on forward speed of the storms.

3:30 p.m. Tuesday: 09.06.21

(Credit: CBS 2)

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Threats include damaging wind, with a lesser chance of large hail and a brief tornado.

Ahead of all that for Monday night, it will be quiet and clear. The low is 65.

Highs Tomorrow: 09.06.21

(Credit: CBS 2)

We begin Tuesday in the warm sector of a storm system. It will be much warmer and humid with gusty southwest winds up to 40 mph. Temperatures will reach the mid and upper 80’s.

A cold front will swing through the area in the afternoon and evening to trigger those strong storms.

The high for Tuesday is 88.

7 Day Forecast: 09.06.21

(Credit: CBS 2)

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Following the frontal passage, much cooler and drier air arrives for Wednesday and Thursday. The high for Wednesday is 77.