1 hail, 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 Apr 18, 3:33 AM EST, 1 hour 12 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND RAPIDS MI 433 AM EDT SUN APR 18 2004 .SHORT TERM... DETERMINING PCPN CHCS OVER THE NEXT 36 HOURS WAS THE MAIN FOCUS AS A WARM FRONT LIFTS NORTH THROUGH THE CWA THIS MORNING...THEN A COLD FRONT COMES ACROSS ON MONDAY. RAIN CHCS RETURN TUESDAY AFTERNOON AS ANOTHER SYSTEM HEADS TOWARD THE GREAT LAKES. A LARGE CLUSTER OF THUNDERSTORMS CONTINUES TO SLIDE OVER LOWER MI THIS MORNING. A WARM FRONT WAS PUSHING INTO THE SOUTHERN PORTION OF THE CWA AS OF 08Z. MOST OF THE STORMS WILL STAY NORTH OF THIS BOUNDARY THIS MORNING AND BEGIN TO WEAKEN AS THEY MOVE AWAY FROM THE LIFT OF THE LOW LEVEL JET. THE WARM FRONT WILL CLEAR THE NORTHERN PORTIONS OF THE CWA BY EARLY AFTERNOON...LEAVING THE ENTIRE CWA IN THE WARM SECTOR. PARTLY SUNNY AFTERNOON SKIES WILL BOOST TEMPS TO AROUND 80 IN AREAS AWAY FROM LAKE MICHIGAN. THERE COULD BE SOME SCATTERED CONVECTION DEVELOPMENT OVER SOUTHERN PORTIONS OF WISCONSIN DURING THE AFTERNOON ON THE NOSE OF A 60 KNOT LOW LEVEL JET. ANY STORMS SHOULD MOVE NE AND MAY CLIP THE NW CORNER OF THE CWA... OTHERWISE EXPECT A DRY AFTERNOON. WITH THE AFTERNOON SUNSHINE WE WILL BE ABLE MIX DOWN SOME OF THESE STRONG WINDS FROM ALOFT. WINDS UP AROUND 30 MPH APPEAR LIKELY BY MID AFTERNOON. A WIND ADVISORY MAY BE NEEDED TOWARD LATE AFTERNOON AND INTO THE EVENING AS THE CORE OF THE JET MOVES OVER THE CWA. ALTHOUGH THERE WILL BE A FAVORABLE LOW LEVEL JET IN PLACE THIS EVENING MOISTURE IS LACKING IN THE WARM SECTOR FOR ANY STORMS TO FIRE EARLY. DEEPER MOISTURE SHOULD ARRIVE AFTER MIDNIGHT AS A RIBBON OF HIGHER DEWPOINTS PROCEEDS A COLD FRONT THAT WILL MOVE INTO EASTERN WISCONSIN BY DAYBREAK. WILL CARRY CHC POPS AFTER MIDNIGHT. THE COLD FRONT PUSHES THROUGH THE CWA ON MONDAY. THE MODELS ARE IN GENERAL AGREEMENT THAT FRONT WILL PASS THROUGH AROUND MID DAY. THIS MAY BE TOO EARLY FOR MUCH ADDITIONAL CONVECTION TO DEVELOP. WILL ONLY CARRY LOW CHC POPS ON MONDAY AS THE MOISTURE BECOMES VERY SHALLOW ONCE THE FRONT PASSES. THE WINDS WILL FINALLY BEGIN TO SIMMER DOWN AS THE PRESSURE GRADIENT RELAXES BEHIND THE FRONT. MUCH COOLER AND DRIER AIR WILL MOVE IN FOR MONDAY NIGHT AS HIGH PRESSURE FLOATS ACROSS THE NORTHERN LAKES. SKIES SHOULD CLEAR... ALONG WITH DIMINISHING WINDS LOWS WILL FALL INTO THE 30S MOST AREAS. ONCE AGAIN THE FRONT SHOULD STALL OVER THE OHIO VALLEY AND THEN BEGIN TO DRIFT NORTH AS ANOTHER LOW PRESSURE FORMS OVER THE CENTRAL PLAINS BY TUESDAY. STRONG ISENTROPIC LIFT OVERRIDES THE FRONT BY AFTERNOON SO CLOUDS SHOULD RETURN FROM SOUTH TO NORTH. WILL HAVE CHC POPS FOR SHOWERS INTO THE AFTERNOON ACROSS THE SOUTH AS THE FRONT IS PROGGED TO BY NEAR THE MI/IN BORDER BY EVENING. THE INCREASING CLOUDS AND EASTERLY FLOW WILL KEEP TEMPS AROUND 60. THE LOW PRESSURE MOVES OUT OF THE PLAINS TUESDAY NIGHT AND HEADS FOR THE GREAT LAKES. WILL CARRY HIGH CHC POPS ACROSS THE CWA. POPS MAY NEED TO BE INCREASED IF THIS MODEL TREND CONTINUES. .LONG TERM... THE EXTENDED PERIOD BEGINS WITH ALL MODELS IN AGREEMENT ON TRACKING A SFC LOW ACROSS SOUTHERN LOWER MICHIGAN ON WEDNESDAY...WITH SHOWERS EXPECTED TO END BY WEDNESDAY NIGHT AS THE SYSTEM PULLS AWAY AND RIDGING MOVES IN. BY THURSDAY AND BEYOND...THERE APPEARS TO BE A STRETCH OF UNSETTLED WEATHER AS SFC FRONT STALLS ACROSS THE OHIO VALLEY WITH ONE OR MORE WEAK SFC LOWS MOVING ALONG IT AND POSSIBLY BRINGING BOUTS OF WET WEATHER TO LOWER MICHIGAN LATE THURSDAY THROUGH EARLY SATURDAY. THE DETAILS ARE STILL RATHER UNCERTAIN SO WILL KEEP THURSDAY DRY FOR NOW...GIVEN THE FACT THAT ANY PRECIP MAY NOT ARRIVE UNTIL LATE IN THE DAY. && .GRR...WATCHES/WARNINGS/ADVISORIES...NONE. && JK OSTUNO
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND RAPIDS MI 1208 PM EDT SAT APR 17 2004 MIZ037>040-043>046-050>052-056>059-064>067-071>074-181000- ALLEGAN-BARRY-CALHOUN-CLARE-CLINTON-EATON-GRATIOT-INGHAM-IONIA- ISABELLA-JACKSON-KALAMAZOO-KENT-LAKE-MASON-MECOSTA-MONTCALM-MUSKEGON- NEWAYGO-OCEANA-OSCEOLA-OTTAWA-VAN BUREN- 1208 PM EDT SAT APR 17 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST LOWER MICHIGAN. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS AFTER MIDNIGHT TONIGHT. A STRONG THUNDERSTORM COMPLEX IS EXPECTED TO DEVELOP OVER MINNESOTA AND WISCONSIN THIS EVENING...THEN MOVE EAST NORTHEAST AROUND 40 MPH INTO CENTRAL LOWER MICHIGAN BY MIDNIGHT. THE MAIN THREAT WITH THESE STORMS IS LARGE HAIL. HIGH WINDS WOULD NOT BE OUT OF THE QUESTION THOUGH. LOCALLY HEAVY RAINFALL AND FREQUENT CLOUD TO GROUND LIGHTING ARE ALSO EXPECTED AS THESE STORMS MOVE ACROSS CENTRAL LOWER MICHIGAN AFTER MIDNIGHT. MOST OF THESE STORMS SHOULD STAY NEAR OR NORTH OF INTERSTATE 96. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ON SUNDAY AS THAT THUNDERSTORM COMPLEX MOVES NORTH WITH THE WARM FRONT. MOST OF THE STRONG STORMS SHOULD BE WELL NORTH OF INTERSTATE 96 SUNDAY. ONCE AGAIN...HAIL WOULD BE THE GREATEST THREAT WITH THESE STORM. MONDAY...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS AS A STRONG COLD FRONT MOVES ACROSS LOWER MICHIGAN DURING THE DAY. THIS THREAT WILL BE MOSTLY EAST OF GRAND RAPIDS SINCE THE FRONT WILL BE MOVING INTO THE STATE DURING MID MORNING HOURS. DAMAGING WINDS AND HAIL ARE THE PRIMARY THREATS FROM THESE STORMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED AFTER MIDNIGHT...DURING THE AFTERNOON ON MONDAY. WDM
The Grand Rapids radar (KGRR), 49 km away, was scanning. The volume nearest the first event began at 09:46 UTC.
1 hail. Local standard time, as filed.
An isolated severe thunderstorm produced one inch diameter hail in West Olive during the early morning hours of the 18th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Michigan in 2004Every state in 2004This day in weather historyWarnings in Michigan, April 2004
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: 5394780.