The two regional radars are not interactive. The intensity is measured in units called dBZ. !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" Site-Specific Observations: The following airport observations are in decoded format. Those radars are listed as GR Earth 1, 2, and 3. Radar essentially detects the location and the intensity of precipitation. The purple swirl icon simply means that intense rotation was detected, but it was located in the upper-level parts of the storm rather than near the bottom. The warnings are also dynamic in the sense that they move with any change in storm motion. This button changes the radar imagery to detect winter precipitation like rain, freezing rain, sleet and snow. The intensity is measured in units called dBZ. The destinations are displayed with objective criteria (climate, budget, activities ...) and are not related to any commercial offers. Welcome to the Weather Observatory's Online Interactive Radar. Areas of particularly strong rotation are indicated by either a purple swirl icon or a purple arrowhead as indicated by the legend on the left-hand side. These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Illinois in october 2020. Check below seasonal norms These statistics are set from the weather statements earlier years of the month of october. Most of Illinois has a humid continental climate (Köppen climate classification Dfa) with hot, humid summers and cool to cold winters. Radar essentially detects the location and the intensity of precipitation. To zoom in and out on the radar please click on the Enable Zoom button under each radar. The high seasonal norm is 65°F. Southern Illinois Climate and Weather. Welcome to our online regional and interactive local radar page. To begin using the radar, choose a map by clicking on one of the images above. When you click on an image the system will begin to load the most current weather data. Notice the first three shades of blue at the bottom of the scale from 0 to 1. The climate is rather cold around this city the month of october, but it is bearable when dressing hot. It must be emphasized at this time, however, that just because a thunderstorm has developed rotation, it does not necessarily mean that this rotation is a tornado. 8 talking about this. You can pan around the image by holding down the left mouse button and moving your mouse. The intensity scale is on the left-hand side of the radar window and ranges from light precipitation represented by the blues and greens, to the intense precipitation, represented by the reds and purples.