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Ontonagon County weather alerts
No active National Weather Service alerts for Ontonagon County, Michigan right now. The most recent was a Red Flag Warning that ended Oct 11, 6:00 PM.
9 in the last 30 days 12 in 12 months (since Aug 30) most common: Freeze Warning Get alerts on your phone →
Active alerts for Ontonagon County
Refreshed every few minutes; times in EDT.
All clear in Ontonagon County
No warnings, watches or advisories are in effect. See what is active across the country, or check a neighbouring county below.
Get Ontonagon 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
Ontonagon 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 Ontonagon County
| Alert | Issued | Ended | Issued by |
|---|---|---|---|
| Red Flag Warning | Oct 11, 2:20 AM | Oct 11, 6:00 PM | Marquette MI |
| Red Flag Warning | Oct 10, 3:57 PM | Oct 11, 6:00 PM | Marquette MI |
| Red Flag Warning | Oct 10, 2:58 AM | Oct 11, 6:00 PM | Marquette MI |
| Red Flag Warning | Oct 9, 2:38 PM | Oct 11, 6:00 PM | Marquette MI |
| Freeze Warning | Oct 3, 12:29 AM | Oct 3, 10:00 AM | Marquette MI |
| Freeze Warning | Oct 2, 8:28 PM | Oct 3, 10:00 AM | Marquette MI |
| Freeze Warning | Oct 2, 1:04 PM | Oct 3, 10:00 AM | Marquette MI |
| Freeze Warning | Oct 2, 12:35 AM | Oct 3, 10:00 AM | Marquette MI |
| Frost Advisory | Sep 22, 1:23 PM | Sep 23, 9:00 AM | Marquette MI |
Pattern
What Ontonagon County gets alerted for
Every alert that named Ontonagon 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.
Critical fire weather: dry fuels, low humidity and gusty winds. Any fire can spread rapidly; avoid outdoor burning.
Sub-freezing temperatures are imminent. Protect tender plants and outdoor plumbing.
Frost is expected on the ground. Cover sensitive plants overnight.
Nearby
Alerts near Ontonagon County
Neighbouring counties in Michigan
Questions
About Ontonagon County alerts
How do I get Ontonagon County weather alerts on my iPhone?
Install Forecast Bar, add Ontonagon County as a location, and turn on severe weather alerts. Every NWS warning, watch and advisory for Ontonagon 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 Ontonagon 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/ontonagon-county.json returns the active alerts, the last 30 days and the 12-month counts for Ontonagon County, refreshed every minute. Please cache responses and credit National Weather Service as the source.
Never find out about a Ontonagon County alert from this page again
Add Ontonagon County in Forecast Bar and every NWS warning, watch and advisory arrives as a push notification the moment it is issued, on iPhone, iPad, Apple Watch, Mac and Apple TV.
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