1 thunderstorm wind, 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 Kansas City, MO wrote its last area forecast discussion before the first event at Aug 1, 1:30 PM CST, 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO 230 PM CDT SUN AUG 1 2004 HEAT AND THE THREAT OF CONVECTION WILL BE THE MAIN CONCERNS THE NEXT COUPLE OF DAYS. CONVECTION WHICH DEVELOPED IN PORTIONS OF NORTH CENTRAL MO THIS MORNING HAS MOVED GRADUALLY E/SE THIS AFTERNOON. CONVECTION DEVELOPING IN AREA OF ISENTROPIC LIFT ON THE 315K THETA SURFACE. CONVECTION WILL CONTINUE TO DIMINISH THIS AFTERNOON AS THE THETAE ADVECTION WEAKENS IN ERN AND CNTRL MO. THE CONVECTION PRODUCED AN OUTFLOW BOUNDARY WHICH WAS LOCATED NEAR A STJ TO KC TO DMO LINE. THE OUTFLOW HAS KEPT TEMPERATURES A LITTLE COOLER THAN EXPECTED...ESPECIALLY THE NERN CORNER OF THE CWA. FIRST CONCERN IS WHETHER THE OUTFLOW BOUNDARY WILL TRIGGER ANY THUNDERSTORMS THIS AFTERNOON. CONVERGENCE ALONG THE OUTFLOW BOUNDARY WILL LIKELY GRADUALLY WEAKEN THIS AFTERNOON. IN ADDITION...STG H8 AND H7 WARMING...AS ADVERTISED ON THE MESOETA...WILL LIKELY PRECLUDE ANY THUNDERSTORM DEVELOPMENT. OF MAIN CONCERN IS THIS EVENING THROUGH TONIGHT. THUNDERSTORMS WERE CURRENTLY DEVELOPING IN WRN IA ALONG THE STG H8-H7 TEMPERATURE GRADIENT. THE 18Z OAX SOUNDING SHOW AN APPRECIABLE WARMING IN THE H8 LAYER WITH A 2 DEGREE WARMUP AT H7. MESOETA STILL SUGGEST THAT ISENTROPIC LIFT ON THE 315K THETA SURFACE WILL EXIST...ALBEIT WEAK...ALONG THE IOWA AND MO BORDER THROUGH THIS EVENING. GIVEN ELEVATED INSTABILITY AND 25-30KT SFC-6KM SHEAR...SCATTERED THUNDERSTORMS ARE POSSIBLE LATE THIS AFTERNOON AND EVENING ACROSS EXTREME NORTH CENTRAL MO. AN ISOLATED THUNDERSTORM MAY BE SEVERE WITH LARGE HAIL AND DAMAGING WINDS THE PRIMARY THREAT. STRONG THETAE ADVECTION ON THE 310-315K THETA SURFACE WILL BE PRESENT IN NERN NEB AND WRN IA AFT 06Z TNGT. THIS AREA WAS LOCATED ALONG THE PERIPHERY OF THE CAP...WITH THUNDERSTORM DEVELOPMENT LIKELY WITHIN THIS AREA. AN MCS WILL LIKELY DEVELOP WITH THE CORFIDI VECTOR SUGGESTING THE MCS MAY CLIP THE NERN ZONES LATE TONIGHT OR MONDAY MORNING. AN OUTFLOW BOUNDARY WILL LIKELY EXIST MONDAY FROM THE OVERNIGHT AND EARLY MONDAY CONVECTION. THIS MAY PLAY HAVOC WITH AFTERNOON HIGHS. THE MOST LIKELY AREA TO BE AFFECTED WILL BE THE NERN CORNER OF THE CWA. THEREFORE...WILL TRIM TEMPERATURES A LITTLE BIT. OTHERWISE...WARMER TEMPERATURES ARE EXPECTED FOR THE SRN AND WRN ZONES MONDAY WITH LLVL WINDS VEERING AND H8 TEMPERATURES INCREASING. HAVE LITTLE CONFIDENCE IN THE GFS AND THE MESOETA WITH ITS DEPICTION OF THE SURFACE AND UPPER LEVEL FIELDS. A SCENARIO CLIMATOLOGICALLY FAVORED FOR NW FLOW ALOFT MAY OCCUR. THE LOW LEVEL THERMAL BOUNDARY SHOULD STILL EXIST ACROSS THE NEB/SD BORDER INTO NRN IOWA MONDAY EVENING. ISENTROPIC LIFT ALONG WITH A THE POTENTIAL OF A SHORTWAVE ROUNDING THE UPPER RIDGE WILL PROVIDE FOR ANOTHER THREAT OF A MCS IN IA MONDAY NIGHT. ONCE AGAIN THIS MAY CLIP THE NERN ZONES. IF AN OUTFLOW BOUNDARY DOES EXIST TUESDAY MORNING...IT WILL LIKELY HAVE LESSER OF AN IMPACT FOR THE NERN ZONES AS MUCH OF THE THUNDERSTORM DEVELOPMENT IS EXPECTED TO BE TO THE EAST OF THE CWA. HEAT INDICES SHOULD CLIMB TO BETWEEN 100 AND 105 ON MONDAY AND MAY EXCEED 105 ON TUESDAY...DEPENDING ON THE DEWPOINT. THERE IS THE POTENTIAL FOR THE DEWPOINTS TO LOWER SOME TUESDAY AFTERNOON DUE TO DEEP MIXING. THE MAIN FORECAST CHALLENGE IN THE EXTENDED PORTION OF THE FORECAST IS ASSESSING HOW THE MID/UPPER RIDGE IS GOING TO BEHAVE AND SUBSEQUENTLY AFFECT TEMPERATURES AND PRECIPITATION CHANCES. MEDIUM RANGE MODELS FORECAST THE RIDGE TO BE SUPPRESSED SOMEWHAT MID TO LATE IN THE UPCOMING WEEK UNDER THE INFLUENCE OF ARCTIC BLOCKED FLOW. THIS SHOULD PUT THE LID ON TEMPERATURES SOMEWHAT...AND ANTICIPATE READINGS ACROSS THE MAJORITY OF THE FORECAST AREA TO TOP OUT IN THE UPPER 80S AND LOW 90S FROM WEDNESDAY ON. THE NEXT DILEMMA IS THE PROBABILITY OF CONVECTION AS THE FORECAST AREA BECOMES ALIGNED ON THE PERIPHERY OF THE UPPER RIDGE...AND A BACK-DOOR FRONT SNEAKS IN. BOTH ETA AND GFS MODELS FORECAST SHOWER AND THUNDERSTORM DEVELOPMENT IN THE VICINITY OF THE FRONT ON WEDNESDAY. WILL MAINTAIN SLIGHT CHANCE POPS ON WEDNESDAY AND WEDNESDAY NIGHT FOR NOW UNTIL CONFIDENCE WITH FRONTAL POSITION AND CAP STRENGTH IMPROVE. ANTICIPATE THE FRONT TO PUSH TO THE SOUTH BY THURSDAY...SO WILL MAINTAIN SUB-20 POPS FOR THURSDAY. THE GFS AND DGEX CONTINUE TO PROG THE DEVELOPMENT OF A CONVECTIVE COMPLEX THURSDAY NIGHT INTO FRIDAY ON THE NORTHERN BORDER OF THE RIDGE. HAVE ADDED 20 POPS TO THURSDAY NIGHT AND FRIDAY FOR THIS POTENTIAL ACTIVITY...BUT WILL LEAVE SATURDAY ALONE FOR NOW. DB/SCHMIT && .PREV DISCUSSION... 300 AM... MID LEVEL RIDGE CENTERED OVER SOUTHERN ROCKIES EVIDENT ON EVENING UPPER AIR ANALYSIS/WATER VAPOR IMAGERY...WHILE DOWNSTREAM TROUGH AXIS LIFTING NORTHEAST ACROSS GREAT LAKES REGION...LEAVING PREDOMINANT ZONAL FLOW ACROSS MUCH OF NORTHERN CONUS. MID LEVEL RIDGE AXIS IS PROGGED TO BUILD EASTWARD OVER THE NEXT COUPLE OF DAYS...RESULTING IN SIGNIFICANT WARM-UP THROUGH THE FIRST HALF OF THE WEEK. EARLY MORNING SURFACE ANALYSIS DEPICTS FRONTAL BOUNDARY EXTENDING ACROSS SD INTO SOUTHERN MN. CONVECTION WHICH FIRED ALONG THIS BOUNDARY EARLIER HAS CONGEALED INTO A FORWARD PROPAGATING MCS AND DEVELOPED SOUTHEASTWARD INTO CENTRAL IA...HOWEVER AS IT CONTINUES TO PROPAGATE INTO INTO AN INCREASINGLY HOSTILE ENVIRONMENT CHARACTERIZED BY LIMITED INSTABILITY PER MSAS AND GOES SOUNDER ANALYSIS...SYSTEM HAS WEAKENED CONSIDERABLY OVER THE PAST HOUR OR SO. WILL MAINTAIN 30 POPS ACROSS FAR NORTHEAST CWA THIS MORNING ASSOCIATED WITH REMNANTS OF DECAYING MCS. ADDITIONALLY...TIGHT 850MB MOISTURE GRADIENT ACROSS EASTERN KS WILL ALLOW FOR REGION OF ISENTROPIC LIFT TO DEVELOP LATE TONIGHT ACROSS WESTERN CWA AS LOW LEVEL JET VEERS...THUS CANT RULE OUT ISOLATED SHOWERS/THUNDERSTORMS. ABNORMALLY COOL JULY (WHICH SEEMS TO HAPPEN ONCE IN A BLUE MOON) WILL GIVE WAY TO A HOT START TO AUGUST. SOUTHERN ROCKIES RIDGE PROGGED TO BUILD EASTWARD INTO PLAINS REGION...WHILE SOUTHWESTERLY 850MB FLOW WILL ADVECT MUCH WARMER AIR ACROSS THE REGION...ALLOWING TEMPERATURES TO WARM INTO THE 90S ACROSS MUCH OF THE FORECAST AREA TODAY. DESPITE INCREASING MOISTURE/INSTABILITY...COMBINATION OF WARM TEMPS ALOFT AND LACK OF A TRIGGER SHOULD KEEP AIRMASS ACROSS FORECAST AREA CAPPED...THUS DO NOT EXPECT ANY TYPE OF CONVECTIVE DEVELOPMENT. 850MB THERMAL RIDGE PROGGED TO CONTINUE TO BUILD ACROSS CENTRAL PLAINS MONDAY...THEN SPREAD ACROSS LOWER MO VALLEY REGION TUESDAY. THIS SHOULD RESULT IN THE HOTTEST DAY OF THE YEAR SO FAR ACROSS THE AREA...WITH TEMPS RISING INTO THE MID TO UPPER 90S. SEAMAN && .EAX WATCHES/WARNINGS/ADVISORIES... KS...NONE. MO...NONE. WFO EAX
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO 1235 PM CDT SUN AUG 1 2004 KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040- 043>046-053-054-021100- THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST...NORTH CENTRAL AND WEST CENTRAL MISSOURI...AS WELL AS EXTREME EASTERN KANSAS. .DAY ONE...THIS AFTERNOON AND TONIGHT THUNDERSTORMS ARE EXPECTED IN NORTHEAST NEBRASKA AND NORTHERN IOWA THIS AFTERNOON AND TONIGHT. THESE STORMS MAY TURN SOUTHEAST INTO PORTIONS OF NORTH CENTRAL MISSOURI...MAINLY NORTH OF A LINE FROM PRINCETON TO MILAN TO KIRKSVILLE. IF ANY THUNDERSTORMS DO OCCUR...THE STORMS WOULD OCCUR AFTER MIDNIGHT. ALTHOUGH SMALL HAIL IS POSSIBLE...THE PRIMARY THREAT IS DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE THUNDERSTORMS ACROSS PORTIONS OF NORTH CENTRAL MISSOURI LATE SUNDAY NIGHT MAY LINGER IN THE SAME AREA MONDAY MORNING. THE PRIMARY THREAT WILL BE DAMAGING WINDS...HOWEVER SMALL HAIL IS POSSIBLE. OTHERWISE...ABOVE NORMAL TEMPERATURES ARE EXPECTED THROUGH WEDNESDAY. HEAT INDICES WILL REACH BETWEEN 100 AND 105 AND GENERALLY BE CONFINED TO AREAS WEST OF A LINE FROM BETHANY TO CHILLICOTHE TO MOBERLY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED NORTH OF A LINE FROM PRINCETON TO MILAN TO KIRKSVILLE LATE TONIGHT AND MONDAY MORNING. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC AND CLIMATE INFORMATION...IS AVAILABLE ON THE WEB AT (LOWER CASE) HTTP://WWW.CRH.NOAA.GOV/EAX OR HTTP://WEATHER.GOV. DB
The Des Moines radar (KDMX), 165 km away, was scanning. The volume nearest the first event began at 19:46 UTC.
1 thunderstorm wind, 1 hail. Local standard time, as filed.
Roofs blown off a post office and American Legion buildings. Trees and telephone lines also down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Missouri in 2004Every state in 2004This day in weather historyWarnings in Missouri, August 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: 5420202, 5420201.