![\"Lake-Michigan-1207\"](\"http:\/\/us.weatheramerica.com\/wp-content\/uploads\/sites\/2\/2025\/07\/Lake-Michigan-1207.jpg\")
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HOLLAND, Michigan<\/strong> \u2013 Just in time for the weekend, swimmers along parts of the Lake Michigan<\/strong> shoreline are getting an icy surprise: a sudden cold-water upwelling<\/strong> has caused water temperatures to plunge dramatically, falling into the 50s Fahrenheit (10\u201315\u00b0C)<\/strong> at some beaches.<\/p>\n <\/p>\n Earlier this week, water temps were comfortably sitting in the mid-70s (around 24\u00b0C)<\/strong>, offering ideal conditions for wading and swimming. But overnight, that warm surface layer was swept away by a shift in wind direction<\/strong>, revealing much colder water below. By Friday morning<\/strong>, readings at Holland State Park Beach<\/strong> had dropped from 72\u00b0F (22\u00b0C)<\/strong> on Thursday to just 58\u00b0F (14\u00b0C)<\/strong>.<\/p>\n <\/p>\n \u201cYikes!<\/strong>\u201d read a post from park staff on social media. \u201cFor those who don\u2019t know, we take a thermometer reading directly from our swim area in Lake Michigan<\/strong> each morning when we arrive. Today\u2019s drop is thanks to what we call a water \u2018flip.\u2019\u201d<\/p>\n <\/p>\n This flip<\/strong>\u2014known more formally as an upwelling<\/strong>\u2014happens when northerly winds<\/strong> push warmer surface water away from the coast. As that water is displaced, colder water from the depths rises to take its place. It\u2019s a natural process, but one that can quickly turn a warm beach day into a bone-chilling experience.<\/p>\n <\/p>\n And it\u2019s not just Holland<\/strong> feeling the effects. Water temperatures have tumbled all along the shoreline:<\/p>\n <\/p>\n At Grand Haven State Park<\/strong>, the lake cooled from 71\u00b0F (21\u00b0C)<\/strong> on Thursday to 63\u00b0F (17\u00b0C)<\/strong> Friday morning. <\/p>\n These quick temperature drops can be more than just a shock\u2014they can be dangerous. Sudden immersion in cold water<\/strong> can trigger cold shock responses<\/strong>, especially for those jumping in from a boat<\/strong> or pier<\/strong>, or swimming long distances.<\/p>\n <\/p>\n While the lake usually recovers after a few days of sun and calm conditions, for now, beachgoers are in for a brisk surprise. If you’re heading to Lake Michigan<\/strong> this weekend, don\u2019t assume it\u2019ll be a warm swim\u2014check the water first.<\/p>\n","protected":false},"excerpt":{"rendered":" HOLLAND, Michigan \u2013 Just in time for the weekend, swimmers along parts of the Lake Michigan shoreline are getting an icy surprise: a sudden cold-water upwelling has caused water temperatures to plunge dramatically, falling into the 50s Fahrenheit (10\u201315\u00b0C) at some beaches. Earlier this week, water temps were comfortably sitting in the mid-70s (around […]<\/p>\n","protected":false},"author":18,"featured_media":5861,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5860","post","type-post","status-publish","format-standard","has-post-thumbnail","category-news"],"yoast_head":"\n
\nLudington State Park<\/strong> also reported 58\u00b0F (14\u00b0C)<\/strong>,
\nDuck Lake State Park<\/strong> measured 62\u00b0F (16\u00b0C)<\/strong>,
\nMuskegon State Park<\/strong> came in at 61\u00b0F (16\u00b0C)<\/strong>.<\/p>\n