Showers and Thundershowers Produce Gusty Winds and Isolated Hail

Bill’s Blog

Posted: Oct 12, 2020 / 03:45 AM EDT Updated: Oct 12, 2020 / 07:38 PM EDT

A band of showers and thundershowers moved across the entire area this PM from west to east. We had several reports of small hail – including at 36th and Burlingame in Wyoming, Grand Haven, Spring Lake, Grand Rapids and Jamestown. A gust to 63 mph was recorded a the airport in Benton Harbor with 7/10ths inch diameter hail at Buchanan.

Peak wind gusts 10 12 20

More peak wind gusts: 48 mph Holland St. Park, 46 mph Grand Rapids, Roosevelt Park and Grand Haven, 45 mph Saugatuck, 44 mph S. Haven , 43 mph Muskegon, Holland (airport) and Whitehall, 42 mph Gobles, 40 mph Portage and Port Sheldon.

Small hail in Grand Haven/Spring Lake around 5 pm 10 12 20 – pic. from Peggy Secory
Severe Weather Outlook Map from the Storm Prediction Center for Mon. Oct. 12

This is the Severe Weather Outlook Map from the Storm Prediction Center for today/tonight. The light green represents areas where a non-severe thundershower is possible. You can see it includes all of Michigan. SPC says: “

Elevated convection is ongoing across WI in the zone of ascent along a surface cold front and immediately downstream from the midlevel trough, where lingering midlevel lapse rates near 8 C/km and MUCAPE of 500-1000 J/kg will support isolated, sub-severe hail through midday. This regime will shift eastward over MI this afternoon, though diminishing buoyancy aloft with eastward extent suggests that the severe threat is minimal." 

Hail reports, pea-sized to nickel-sized in Wisconsin at Berlin, Hartford, Jeferson, Allenton and Doylestown. 1 pm temperatures: Kalamazoo 67, Grand Rapids 62, Big Rapids 57, raining in Milwaukee and Chicago. Peak gusts up to 35-40 mph in Wisconsin.

We do expect the band of showers to be accompanied by a sharp wind shift from south to west and perhaps some gusts to 30-40 mph.

Storm reports from Sunday 10/11/20

Here’s storm reports for Sunday. There were 3 (and possibly a fourth, where there was one injury) tornadoes in NE South Carolina. The severe reports in the Plains States are from the system that will move into Michigan this afternoon. Hail as big as baseballs fell in Eastern Nebraska, with 76 mph wind gusts at Lincoln NE and 72 mph at Firth NE.

Here’s Grand Rapids Radar

Central Great Lakes sector
Go to: Loop of this image

And Regional Radar

Forecast Radar for Monday PM

This Graphic from the G. R. National Weather Service shows the approximate timing of the showers this PM.

Below are expected high temperatures today – occurring before the rain moves in this PM.

High Temperatures Monday

Gale Warnings will be in effect for Lake Michigan from 10 am to 7 pm for S to W wind gusts to 40 mph and waves as high as 9 feet.

BTW – today is Columbus Day – It’s a Federal Holiday – so no mail delivery today. You can read the journal of Christopher Columbus at this link.