Increased risk over Grand Rapids, Lansing, and Flint
Lower Michigan is facing a significantly increased threat of severe thunderstorms this afternoon and evening, following a decisive forecast upgrade from the Storm Prediction Center (SPC). Thanks to strong sunshine and early-afternoon heat, the atmosphere is becoming unstable, laying the groundwork for storms to erupt rapidly.
Stronger instability in southwest and south-central Michigan
The yellow shaded area on the updated SPC outlook map now indicates a level 2 (slight) risk for severe weather. This zone now includes Grand Rapids, Kalamazoo, Lansing, Jackson, Flint, Saginaw, and Bay City. Bright sunshine is accelerating surface heating, fueling atmospheric instability and priming the region for storm development.
Main threat: damaging straight-line winds
While no tornado warnings are in effect, scattered straight-line winds are expected to be the primary threat. The SPC has highlighted a 15 percent chance for severe wind gusts, especially at the leading edge of storms. These gusts may exceed 58 mph (93 km/h), enough to knock down branches, cause localized power outages, and impact high-profile vehicles on highways like I-94 and US-131.
Hail possible over central Michigan
The brown shaded zone indicates a 5 percent chance of hail one inch (2.5 cm) or larger. This includes much of central Lower Michigan, overlapping slightly with the severe wind risk zone. Hail may accompany the strongest embedded storm cells between 4 p.m. and 6 p.m..
Timing: 4 p.m. to 7 p.m. window is critical
High-resolution models show a line of storms initiating around 4 p.m., with storms peaking in strength quickly, then weakening after 7 p.m. As a result, Ann Arbor, Detroit, and the Thumb region will likely experience weaker, decaying thunderstorms, posing a minimal severe threat.
What to expect now
The atmosphere is ready to support storm development imminently, especially across southwest and south-central Lower Michigan. Be alert to sudden storm formation, particularly between Lansing and Kalamazoo, where surface temperatures are rapidly rising and cumulus clouds are thickening.
Today is Tuesday, June 10, and based on current trends, this evening’s commute in parts of Lower Michigan could be affected by brief but intense weather episodes, including gusty winds, heavy rain, and isolated hail.
Stay tuned for radar updates and monitor warnings closely if you’re traveling through Grand Rapids, Flint, or Jackson this afternoon.
