Live · updated 1 min ago
St. Clair County weather alerts
No active National Weather Service alerts for St. Clair County, Michigan right now. The most recent was a Special Weather Statement that ended Oct 20, 8:15 AM.
6 in the last 30 days 6 in 12 months (since Aug 30) most common: Frost Advisory Get alerts on your phone →
Active alerts for St. Clair County
Refreshed every few minutes; times in EDT.
All clear in St. Clair County
No warnings, watches or advisories are in effect. See what is active across the country, or check a neighbouring county below.
Get St. Clair County 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
St. Clair 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 St. Clair County
| Alert | Issued | Ended | Issued by |
|---|---|---|---|
| Special Weather Statement | Oct 20, 6:08 AM | Oct 20, 8:15 AM | Detroit/Pontiac MI |
| Frost Advisory | Oct 17, 3:38 PM | Oct 18, 8:00 AM | Detroit/Pontiac MI |
| Frost Advisory | Oct 17, 11:59 AM | Oct 18, 8:00 AM | Detroit/Pontiac MI |
| Frost Advisory | Oct 16, 1:59 PM | Oct 17, 8:00 AM | Detroit/Pontiac MI |
| Frost Advisory | Oct 5, 2:35 PM | Oct 6, 8:00 AM | Detroit/Pontiac MI |
| Flood Advisory | Oct 2, 3:42 AM | Oct 2, 9:45 AM | Detroit/Pontiac MI |
Pattern
What St. Clair County gets alerted for
Every alert that named St. Clair 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.
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.
Frost is expected on the ground. Cover sensitive plants overnight.
Minor flooding of streets, streams or low-lying areas is expected. Expect ponding on roads and use caution when driving.
Nearby
Alerts near St. Clair County
Neighbouring counties in Michigan
Questions
About St. Clair County alerts
How do I get St. Clair County weather alerts on my iPhone?
Install Forecast Bar, add St. Clair County as a location, and turn on severe weather alerts. Every NWS warning, watch and advisory for St. Clair 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 St. Clair County. 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/mi/st-clair-county.json returns the active alerts, the last 30 days and the 12-month counts for St. Clair County, refreshed every minute. Please cache responses and credit National Weather Service as the source.
Never find out about a St. Clair County alert from this page again
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