No active National Weather Service alerts for Allegan County right now. This page is the live destination for Allegan County (county seat: Allegan) — bookmark it to check active watches, warnings, and advisories from NWS Grand Rapids, plus regional context, common weather hazards, and the most recent alerts.
Southwest Michigan — including Berrien, Cass, Van Buren, Allegan, Kent, Kalamazoo, and Ottawa — lies in the heart of the Midwest's tornado-prone corridor. The most severe and frequent tornadoes in Michigan history occur in this region, with peak activity from April through July. Lake Michigan moderates winter temperatures along the immediate shoreline but generates substantial lake-effect snow inland. Lakeshore flooding from sustained westerly winds is a known hazard for Berrien, Van Buren, and Ottawa counties.
Allegan County is served by NWS Grand Rapids, headquartered in Grand Rapids, MI, which issues all official severe-weather watches, warnings, and advisories for the county under the SAME geographic code MIC005. Alerts shown above come directly from the National Weather Service public-alerts feed and update within seconds of issuance.
The U.S. EPA's Safe Drinking Water Information System lists 318 public water systems in Allegan County with open health-based violations or recent enforcement activity. These are typically municipal water utilities, mobile-home parks, schools, and private community systems — not bottled water or private household wells. Residents on these systems should have received a Consumer Confidence Report (CCR) by mail; the systems below are listed in order of open violations on file.
Based on Allegan County's southwest lower peninsula geography, residents and visitors should be prepared for these recurring weather threats:
A Tornado Warning means a tornado has been sighted or indicated by radar in Allegan County or an adjacent area — take shelter immediately. Move to the lowest floor of a sturdy building, away from windows, and into an interior room (basement, bathroom, or closet). Mobile homes and vehicles are not safe; if you're in either, leave for a sturdy structure if you can do so safely. Tornado Warnings are typically issued for 30–60 minutes; stay sheltered until the warning expires or NWS Grand Rapids confirms the threat has passed. Allegan County residents should monitor a NOAA Weather Radio (programmed for SAME code MIC005), local TV, or this page.
A Flood Warning means flooding is occurring or imminent in Allegan County. Do not drive through flooded roads — most flood-related deaths in Michigan occur in vehicles attempting to cross water. If you live in a low-lying area near Allegan or along major waterways in the county, monitor official water-level reports from the U.S. Geological Survey and prepare to move to higher ground. Flash Flood Warnings carry the same urgency on a shorter time horizon — typically less than an hour to act.
Winter Storm Warnings in Allegan County indicate hazardous winter weather (heavy snow, freezing rain, sleet, or blizzard conditions) is occurring or imminent. Avoid travel; if you must drive, carry an emergency kit (blankets, food, water, flashlight, charged phone). Heating-source safety is critical: never run generators or grills indoors, and check carbon-monoxide detectors before relying on alternative heat sources.
Weather rarely respects county lines — check active alerts in Allegan County's neighbors:
Subscribe to push or email notifications for new National Weather Service watches and warnings issued for Allegan County. We'll alert you within seconds of NWS Grand Rapids issuing any severe weather warning for SAME code MIC005.