3 thunderstorm wind, as filed by the National Weather Service.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Rapids, MI wrote its last area forecast discussion before the first event at Aug 11, 11:12 AM EST, 2 hours 33 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND RAPIDS MI 1210 PM EDT MON AUG 11 2003 THE DIURNAL FLARE TO CONVECTION IS ONCE AGAIN OCCURRING...FOR WHAT HAS BEEN MANY DAYS IN A ROW. UNSTABLE AIRMASS IN PLACE TODAY...WITH SURFACE DEW POINTS AROUND +18 C COMBINING WITH 500MB TEMPS AROUND -11 C. MORNING SOUNDINGS INDICATE CAPE VALUES ON THE ORDER OF 2000 J/KG AND LI/S DROPPING TO -6 WITH MAX HEATING. CONVERGENCE ALONG A WEAK COOL FRONT THAT IS DRAPED ACROSS THE AREA IS AIDING THUNDERSTORMS DEVELOPMENT...AS IS A SHORTWAVE SEEN DROPPING SOUTH FROM THE LAKE SUPERIOR REGION. SKIES WILL VARY BETWEEN PARTLY AND MOSTLY CLOUDY THROUGH THE AFTERNOON WITH THE INSTABILITY RESULTING IN A CUMULUS FIELD ACROSS THE AREA. HIGHS AND WINDS LOOK ON TRACK. ZONES ALREADY SENT. .GRR...NONE. DUKE
MIZ037>040-043>046-050>052-056>059-064>067-071>074-121000- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND RAPIDS MI 1244 PM EDT MON AUG 11 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE SOUTHWEST QUARTER OF LOWER MICHIGAN. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL BE POSSIBLE BOTH THIS AFTERNOON AND TONIGHT ACROSS ALL OF THE SOUTHWEST QUARTER OF LOWER MICHIGAN. THESE STORMS ARE NOT EXPECTED TO BE SEVERE...BUT WILL BE CAPABLE OF PRODUCING HEAVY RAIN...CLOUD TO GROUND LIGHTNING STRIKES AND WIND GUSTS TO 30 MPH. THE STRONGEST OF STORMS MAY PRODUCE PEA SIZE HAIL AND WIND GUSTS TO 45 MPH. LOCALLY HEAVY RAIN LOOKS TO BE THE BIGGEST THREAT AS STORMS WILL HAVE A FAIRLY SLOW MOVEMENT TO THE SOUTHWEST AROUND 20 MPH. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THUNDERSTORMS ARE IN THE FORECAST AGAIN ON TUESDAY...ESPECIALLY ACROSS SOUTHERN LOWER MICHIGAN. THESE STORMS ARE NOT ANTICIPATED TO BE SEVERE EITHER. STORMS RETURN TO THE FORECAST FOR THE UPCOMING WEEKEND ON SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH THE PERIOD. DUKE
The Grand Rapids radar (KGRR), 64 km away, was scanning. The volume nearest the first event began at 18:43 UTC.
3 thunderstorm wind. Local standard time, as filed.
A 62 m.p.h. wind gust was recorded in Parchment, where several trees were blown down at the intersection of D Avenue and Riverview Drive.
Two trees were blown down by severe thunderstorm wind gusts just west of Hickory Corners.
A 69 m.p.h. wind gust was recorded in Portage.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2003Every state in 2003This day in weather historyWarnings in Michigan, August 2003
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5369413, 5369411, 5369412.