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Mount Prospect weather alerts
No active National Weather Service alerts for Mount Prospect, Illinois right now. The most recent was a Dense Fog Advisory that ended Oct 20, 10:00 AM.
37 in the last 30 days 94 in 12 months (since Aug 30) most common: Beach Hazards Statement Get alerts on your phone →
Active alerts for Cook County
NWS issues alerts by county; Mount Prospect is in Cook County. Refreshed every few minutes; times in CDT.
All clear in Cook County
No warnings, watches or advisories are in effect. See what is active across the country, or check a neighbouring county below.
Get Mount Prospect alerts on your phone before you think to look them up
Forecast Bar watches the official alert feeds around the clock, NWS in the United States and Environment Canada in Canada, and pushes every warning, watch and advisory for your saved locations the moment it is issued. This page is the same data, a few minutes later.
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Where
Cook County on the map
Alert polygons are NWS's own. Forecast Bar's radar shows the same warnings over live precipitation, with future radar and lightning. See the radar.
Last 30 days
Recent alerts for Cook County
| Alert | Issued | Ended | Issued by |
|---|---|---|---|
| Dense Fog Advisory | Oct 20, 9:55 AM | Oct 20, 10:00 AM | Chicago IL |
| Dense Fog Advisory | Oct 20, 9:14 AM | Oct 20, 10:00 AM | Chicago IL |
| Dense Fog Advisory | Oct 20, 7:38 AM | Oct 20, 10:00 AM | Chicago IL |
| Dense Fog Advisory | Oct 20, 5:44 AM | Oct 20, 9:00 AM | Chicago IL |
| Dense Fog Advisory | Oct 20, 4:19 AM | Oct 20, 9:00 AM | Chicago IL |
| Dense Fog Advisory | Oct 20, 4:19 AM | Oct 20, 9:00 AM | Chicago IL |
| Dense Fog Advisory | Oct 20, 3:42 AM | Oct 20, 9:00 AM | Chicago IL |
| Flood Advisory | Oct 2, 6:56 AM | Oct 2, 7:00 AM | Chicago IL |
| Flood Advisory | Oct 2, 6:56 AM | Oct 2, 7:00 AM | Chicago IL |
| Flood Advisory | Oct 1, 10:10 PM | Oct 2, 7:00 AM | Chicago IL |
| Flood Advisory | Oct 1, 10:10 PM | Oct 2, 7:00 AM | Chicago IL |
| Flood Advisory | Oct 1, 8:44 PM | Oct 1, 10:15 PM | Chicago IL |
| Flood Advisory | Oct 1, 8:44 PM | Oct 1, 10:15 PM | Chicago IL |
| Flood Advisory | Oct 1, 7:14 PM | Oct 1, 10:15 PM | Chicago IL |
| Flood Advisory | Oct 1, 7:13 PM | Oct 1, 10:15 PM | Chicago IL |
| Flood Advisory | Oct 1, 7:08 PM | Oct 1, 8:45 PM | Chicago IL |
| Flood Advisory | Oct 1, 5:52 PM | Oct 1, 8:45 PM | Chicago IL |
| Flood Watch | Oct 1, 2:44 PM | Oct 1, 10:00 PM | Chicago IL |
| Flood Watch | Oct 1, 9:33 AM | Oct 1, 10:00 PM | Chicago IL |
| Hydrologic Outlook | Sep 30, 1:02 PM | Oct 1, 4:00 AM | Chicago IL |
| Hydrologic Outlook | Sep 30, 1:00 PM | Sep 30, 3:00 PM | Chicago IL |
| Hydrologic Outlook | Sep 30, 3:59 AM | Sep 30, 3:00 PM | Chicago IL |
| Hydrologic Outlook | Sep 29, 2:48 PM | Sep 30, 4:00 AM | Chicago IL |
| Dense Fog Advisory | Sep 29, 9:51 AM | Sep 29, 10:00 AM | Chicago IL |
| Special Weather Statement | Sep 29, 7:14 AM | Sep 29, 9:30 AM | Chicago IL |
| Dense Fog Advisory | Sep 29, 6:07 AM | Sep 29, 10:00 AM | Chicago IL |
| Special Weather Statement | Sep 29, 4:12 AM | Sep 29, 7:00 AM | Chicago IL |
| Special Weather Statement | Sep 28, 4:06 AM | Sep 28, 7:00 AM | Chicago IL |
| Special Weather Statement | Sep 28, 12:17 AM | Sep 28, 4:00 AM | Chicago IL |
| Special Weather Statement | Sep 27, 7:08 AM | Sep 27, 9:30 AM | Chicago IL |
| Special Weather Statement | Sep 27, 7:04 AM | Sep 27, 9:30 AM | Chicago IL |
| Beach Hazards Statement | Sep 23, 9:46 PM | Sep 23, 10:00 PM | Chicago IL |
| Beach Hazards Statement | Sep 23, 2:41 PM | Sep 23, 10:00 PM | Chicago IL |
| Beach Hazards Statement | Sep 23, 10:01 AM | Sep 23, 10:00 PM | Chicago IL |
| Beach Hazards Statement | Sep 23, 3:23 AM | Sep 23, 10:00 PM | Chicago IL |
| Beach Hazards Statement | Sep 22, 9:44 PM | Sep 23, 10:00 PM | Chicago IL |
| Beach Hazards Statement | Sep 22, 2:48 PM | Sep 23, 7:00 PM | Chicago IL |
Pattern
What Cook County gets alerted for
Every alert that named Cook County in the last 12 months, by type. Records begin August 30, 2026, so this fills in over the year.
Plain English
What these alerts mean
A warning means the hazard is happening or about to; a watch means conditions favour it; an advisory is a lesser hazard still worth planning around.
Visibility of a quarter mile or less is expected. Slow down and use low beams.
Minor flooding of streets, streams or low-lying areas is expected. Expect ponding on roads and use caution when driving.
Conditions are favourable for flooding. Have a plan in case a warning is issued.
Flooding may develop over the coming days as rain, snowmelt or river levels rise.
A heads-up about conditions that do not meet warning or advisory criteria but still deserve attention, such as a strong storm, patchy fog or a brief burst of snow.
Hazards such as rip currents, sneaker waves or cold water are expected at the beach.
Heat index values high enough to cause heat illness with prolonged exposure. Drink water, stay in air conditioning and check on neighbours.
Flooding of rivers, streams or low-lying areas is occurring or expected. Avoid flooded roads and monitor river levels.
Nearby
Alerts near Mount Prospect
Cities
Neighbouring counties in Illinois
Questions
About Mount Prospect alerts
How do I get Mount Prospect weather alerts on my iPhone?
Install Forecast Bar, add Mount Prospect as a location, and turn on severe weather alerts. Every NWS warning, watch and advisory for Cook County then arrives as a push notification at the moment of issue, with Critical Alerts available for the most dangerous warnings. Forecast Bar also runs on iPad, Apple Watch, Mac and Apple TV.
Where do these alerts come from?
From the National Weather Service alert feed (api.weather.gov). NWS issues alerts by county and by forecast zone; this page lists every product that names Cook County, the county Mount Prospect sits in. Forecast Bar checks the feed continuously and this page refreshes within a few minutes of a change.
What is the difference between a watch, a warning and an advisory?
A warning means the hazard is occurring, imminent or very likely: act now. A watch means conditions are favourable for it to develop: prepare and stay informed. An advisory covers a hazard that is less serious than a warning but can still cause real inconvenience or danger if you are not ready for it.
Can I get this data as JSON?
Yes. /weather-alerts/il/mount-prospect.json returns the active alerts, the last 30 days and the 12-month counts for Mount Prospect, refreshed every minute. Please cache responses and credit National Weather Service as the source.
Never find out about a Cook County alert from this page again
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