Frost Advisory. Wind Chill Advisory. Wind Chill Warning. Fire Weather. Fire Weather Watch. Red Flag Warning. Dense Fog Advisory. High Wind Watch. High Wind Warning. Wind Advisory. Severe Thunderstorm Watch. Severe Thunderstorm Warning. Tornado Watch. Tornado Warning. Small Craft Advisory. Gale Warning. Storm Warning. Hurricane Force Wind Warning. Special Marine Warning. Coastal Flood Watch. Coastal Flood Warning. Coastal Flood Advisory. Flash Flood Watch. Flash Flood Warning.
Flood Watch. Flood Warning. River Flood Watch. River Flood Warning. Excessive Heat. Excessive Heat Watch. Excessive Heat Warning. Heat Advisory. Tropical Storm Watch. Tropical Storm Warning. Hurricane Watch. Hurricane Warning. The Hazardous Weather Outlook will describe potential hazardous weather and hydrologic information of concern in Days 1 through 7.
The outlook contains two segments: One segment for the marine zones and adjacent land-based i. Each segment of the HWO will contain 3 sections: short term through Day 1, long term for Days , and spotter information. A Winter Storm Watch is issued when there is the potential for significant and hazardous winter weather within 48 hours. It does not mean that significant and hazardous winter weather will occur A Blizzard Warning means that the following conditions are occurring or expected within the next 12 to 18 hours.
There is no temperature requirement that must be met to achieve blizzard conditions. A Winter Storm Warning is issued when a significant combination of hazardous winter weather is occurring or imminent. A Winter Weather Advisory will be issued for any amount of freezing rain, or when 2 to 4 inches of snow alone or in combination with sleet and freezing rain , is expected to cause a significant inconvenience, but not serious enough to warrant a warning.
A Freeze Watch is issued when there is a potential for significant, widespread freezing temperatures within the next hours. A Freeze Watch is issued in the autumn until the end of the growing season marked by the occurrence of first widespread freeze. If winter weather approaches and does not exceed the criteria to warrant a warning, then forecasters issue a winter weather advisory.
Winter weather advisories usually are issued 12 to 24 hours before the storm starts, and occasionally beyond that as much as 36 hours before a storm moves into the forecast area. According to the NWS forecast office in Central Illinois, a winter weather advisory is issued for an all-snow event where 3 to 5 inches of snow is forecast in a hour period.
An advisory also may be issued for expected snow, sleet, or a trace of ice accumulation. Forecasters at the NWS will issue a "winter storm watch" when significant and hazardous winter weather is expected.
Watches occur when conditions are favorable for hazardous winter weather conditions to develop over part of the forecast area in the 24 to hour period from the start of the storm. Winter storm warning vs. Location Help. News Headlines. Customize Your Weather. Privacy Policy. Central Illinois Weather Forecast Office. Current Hazards. Local Radar. Rivers and Lakes. Climate and Past Weather.
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