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Delta County weather alerts

1 active alert for Delta County, Michigan right now: a Dense Fog Advisory.

14 in the last 30 days 16 in 12 months (since Aug 30) most common: Dense Fog Advisory Get alerts on your phone →

Active alerts for Delta County

Refreshed every few minutes; times in EDT.

Moderate Expected

Dense Fog Advisory

Issued Fri, Oct 23, 3:46 AM EDT by NWS Marquette MI Until Fri, Oct 23, 10:00 AM EDT (in 6 hr)

Area: Keweenaw; Houghton; Baraga; Marquette; Alger; Luce; Iron; Dickinson; Menominee; Delta; Southern Schoolcraft; Southern Houghton; Northern Schoolcraft

* WHAT...Visibility 1/4 mile or less in dense fog. * WHERE...Portions of central Upper and western Upper Michigan. * WHEN...Until 10 AM EDT /9 AM CDT/ this morning. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Areas along the Lake Superior shoreline can expect less in the way of fog due to light, southerly dow...

What it means: Visibility of a quarter mile or less is expected. Slow down and use low beams.

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Where

Delta 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 Delta County

Alert	Issued	Ended	Issued by
Dense Fog Advisory	Oct 22, 9:17 PM	10:00 AM	Marquette MI
Dense Fog Advisory	Oct 22, 2:37 PM	9:00 AM	Marquette MI
Dense Fog Advisory	Oct 22, 7:22 AM	Oct 22, 11:00 AM	Marquette MI
Dense Fog Advisory	Oct 22, 2:06 AM	Oct 22, 10:00 AM	Marquette MI
Special Weather Statement	Oct 21, 3:04 AM	Oct 21, 9:00 AM	Marquette MI
Special Weather Statement	Oct 10, 5:47 PM	Oct 11, 6:00 PM	Marquette MI
Special Weather Statement	Oct 9, 2:49 PM	Oct 10, 5:00 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
Special Weather Statement	Sep 26, 5:59 AM	Sep 26, 8:00 AM	Marquette MI
Special Weather Statement	Sep 26, 2:48 AM	Sep 26, 9:00 AM	Marquette MI

Pattern

What Delta County gets alerted for

Every alert that named Delta County in the last 12 months, by type. Records begin August 30, 2026, so this fills in over the year.

Dense Fog Advisory

Special Weather Statement

Freeze Warning

Frost Advisory

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.

Dense Fog Advisory

Visibility of a quarter mile or less is expected. Slow down and use low beams.

Special Weather Statement

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.

Freeze Warning

Sub-freezing temperatures are imminent. Protect tender plants and outdoor plumbing.

Frost Advisory

Frost is expected on the ground. Cover sensitive plants overnight.

Nearby

Alerts near Delta County

Neighbouring counties in Michigan

Menominee County1 Alger County1 Schoolcraft County1 Marquette County1 All of Michigan →

Questions

About Delta County alerts

How do I get Delta County weather alerts on my iPhone?

Install Forecast Bar, add Delta County as a location, and turn on severe weather alerts. Every NWS warning, watch and advisory for Delta 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 Delta 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/delta-county.json returns the active alerts, the last 30 days and the 12-month counts for Delta County, refreshed every minute. Please cache responses and credit National Weather Service as the source.

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