3 flash flood, 1 thunderstorm wind, as filed by the National Weather Service.
Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. 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 Denver/Boulder, CO wrote its last area forecast discussion before the first event at Aug 4, 2:01 PM MST, 5 hours 59 minutes earlier.
NORTHEAST AND NORTH CENTRAL COLORADO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER COLORADO 301 PM MDT SUN AUG 4 2002 TONIGHT: CURRENT RADAR PICTURES ARE INDICATING SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS GOING OVER THE FOOTHILLS...PARK COUNTY...AND THE PALMER RIDGE. THIS AFTERNOON HAS A BIT MORE LOW LEVEL MOISTURE IN PLACE THEN SATURDAY AFTERNOON AND THE ACARS SOUNDINGS SHOW THE MID/UPPER LEVEL CAP A BIT WEAKER. THE REAL SOUNDINGS KEEP SHOWING PRECIPITABLE WATER VALUES OVER AN INCH. SCATTERED TO ISOLATED POPS WILL SUFFICE THIS EVENING. MONDAY THROUGH WEDNESDAY: THE WATER VAPOR SATELLITE PICTURES ARE SHOWING A BIT OF A MID/UPPER LEVEL DRY INTRUSION COMING OUR WAY. HOWEVER THE MOISTURE SHOULD NOT BE PINCHED OFF COMPLETELY. MODELS SHOW THE UPPER RIDGE CENTER TO REMAIN EAST OF THE FORECAST OFFICE THROUGH THE PERIOD. SO WE SHOULD STAY IN THE FAVORABLE FETCH FOR MID AND UPPER LEVEL MOISTURE. IN THE LOW LEVELS...THE GRIDS KEEP SOME FORM OF EASTERLY FLOW UP INTO THE FOOTHILLS THROUGH WEDNESDAY ALONG WITH A DECENT THETA-E AXIS BELOW 600 MB...ESPECIALLY OVER THE FOOTHILLS AND ADJACENT PLAINS. CROSS SECTION LAPSE RATES SHOW A PRETTY GOOD CAP CONTINUING BETWEEN 500-400 MB. THE DIV-Q GRIDS SHOW LITTLE SYNOPTIC SCALE FORCING ON MONDAY...BUT SOME WEAK ASCENT IN PROGGED FOR TUESDAY AND WEDNESDAY. PRECIPITATION GRIDS SHOW MEASURABLE PRECIPITATION OVER THE WESTERN TWO-THIRDS OF THE FORECAST AREA FROM ABOUT MID AFTERNOON THROUGH JUST AFTER MIDNIGHT ALL THREE DAYS...MONDAY THROUGH WEDNESDAY. SINCE IT ACTUALLY HAS STARTED TO RAIN NOW WITH THE GREAT PONTOON UPON UP...PERSISTENCE SHOULD BE THE BEST ROUTE TO GO WITH AS FAR AS POPS GO. SCATTEREDS LOOK GOOD FOR THE MOUNTAIN...FOOTHILLS...PALMER RIDGE...AND URBAN CORRIDOR THROUGH THE PERIOD. FOR TEMPERATURES...GRIDS SHOW MINOR FLUCTUATION THROUGH THE PERIOD...BUT PERSISTENCE WILL BE GOOD... WHICH BY THE WAY KEEPS THE READINGS NEAR NORMALS. FOR THE EXTENDED PERIOD THE UPPER RIDGE CENTER REMAINS EAST OF THE FORECAST AREA THROUGH ABOUT FRIDAY. AN UPPER TOUGH NORTH OF COLORADO PUSHES EAST LATE FRIDAY INTO SATURDAY...WITH THE UPPER RIDGE PUSHING BACK TO OUR SOUTHWEST BY SUNDAY. WILL START TO DRY OUT THE FORECAST FOR NEXT WEEKEND. RJK .DEN...NONE.
The Goodland radar (KGLD), 148 km away, was scanning. The volume nearest the first event began at 03:16 UTC.
3 flash flood, 1 thunderstorm wind. Local standard time, as filed.
Heavy rainfall caused flooding and flash flooding problems in and around Holyoke. In the town of Holyoke, the intersections of State Highways 385 and 6 were under water. Floodwaters also inundated highway 385, 8 miles north of Holyoke.
Heavy rain caused flash flooding across eastern sections of Logan County. County Roads 60.5, 64 and 81 were partially washed out by floodwaters.
Heavy rain also caused flash flooding along State Highway 385 south of Julesburg. The highway had to be closed as over a foot of water covered portions of the roadway.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2002Every state in 2002This day in weather historyWarnings in Colorado, August 2002
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: 5313020, 5313019, 5313021, 5313022.