![]() Light snow will continue off and on through Wednesday evening, Mowry said. Snow totals by Wednesday afternoon could reach 10 inches in the far south suburbs, with 3 to 6 inches possible in the city and lighter amounts of only 1 to 3 inches for the northern suburbs. This appears to be the heaviest period of snowfall, with snow falling up to an inch an hour, and will continue through the early afternoon on Wednesday. It will turn to snow as cold air arrives, Mowry said. The first wave of wintry precipitation began as rain Tuesday afternoon. In the southwest and south suburbs and northwest Indiana, snow is expected to begin in the evening and continue through until Thursday, though the intensity is likely to ebb and then increase again.Ĭity dwellers can expect to wake up Wednesday morning with a couple inches of snow on the ground by 7:30 a.m., while areas to the south are more likely to wake up to five to six inches, Mowry said. A second wave of snow is expected Wednesday night into Thursday. and continue through to Wednesday afternoon. Snow is expected to start in the city around 8 p.m. There's also likely to be a sharp cutoff between areas that get just a dusting of snow and areas that get significantly more. All appointments will be rescheduled, the city said.ĪBC7 Chicago meteorologist Larry Mowry said there will be two waves of snow, which may only be distinguishable by the snow intensity. Thursday for Ford, Iroquois, Kankakee and Livingston counties in Illinois and La Porte, Benton, Jasper, Lake, Newton and Porter counties in Indiana, until 6 p.m.Ĭook County is closing its county-run COVID vaccination sites Wednesday due to the snow, and the city of Chicago has canceled its in-home vaccination appointments for Wednesday and Thursday. Wednesday for DuPage, Kendall, central Cook, eastern Will, Grundy, LaSalle, northern Will and southern Cook counties in Illinois.Ī Winter Storm Warning is in effect from 10 p.m. Heavy snow and dangerous travel conditions are possible Tuesday evening through Thursday this week, as the latest winter storm takes aim at the Chicago area.Ī Winter Storm Warning is in effect from 8 p.m. Since hail can cause the rainfall estimates to be higher than what is actually occurring, steps are taken to prevent these high dBZ values from being converted to rainfall.A winter storm is bringing tightly gradianted bands of snow to the Chicago area, with some areas just getting a dusting and others possibly topping 10 inches.ĬHICAGO (WLS) - A winter storm warning has prompted Governor JB Pritzker to issue a disaster declaration for the state ahead of the arrival of the snow.Ĭlick here to see school closings, moves to e-learning in the Chicago area Hail is a good reflector of energy and will return very high dBZ values. These values are estimates of the rainfall per hour, updated each volume scan, with rainfall accumulated over time. Depending on the type of weather occurring and the area of the U.S., forecasters use a set of rainrates which are associated to the dBZ values. The higher the dBZ, the stronger the rainrate. Typically, light rain is occurring when the dBZ value reaches 20. The scale of dBZ values is also related to the intensity of rainfall. The value of the dBZ depends upon the mode the radar is in at the time the image was created. Notice the color on each scale remains the same in both operational modes, only the values change. ![]() The other scale (near left) represents dBZ values when the radar is in precipitation mode (dBZ values from 5 to 75). One scale (far left) represents dBZ values when the radar is in clear air mode (dBZ values from -28 to +28). Each reflectivity image you see includes one of two color scales. The dBZ values increase as the strength of the signal returned to the radar increases. So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). "Reflectivity" is the amount of transmitted power returned to the radar receiver. The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan.
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