1 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 Denver/Boulder, CO wrote its last area forecast discussion before the first event at Jul 31, 2:16 PM MST, 44 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER CO 316 PM MDT SAT JUL 31 2004 .SHORT TERM DISCUSSION...MINIMAL CONVECTION OCCURRING AT THIS TIME. THE STORMS ARE HIGH BASED AND HAVING A HARD TIME SURVIVING OUT ON THE PLAINS. DEW POINTS OVER THE PLAINS ARE MAINLY IN THE 30S. GRIDS ARE SHOWING THE UPPER HIGH CENTER TO DRIFT EASTWARD OVERNIGHT AND SUNDAY...WITH THE CENTER AROUND THE SOUTHEASTERN COLORADO CORNER BY 00Z IN THE AFTERNOON. THE 30-40 KNOT WEST-NORTHWESTERLY JET LEVEL FLOW IS PROGGED TO BECOME 30-40 KNOT WEST-SOUTHWESTERLY FLOW BY SUNDAY LATE DAY. THE DIV-Q GRIDS SHOW NEUTRAL FORCING OVER THE FORECAST AREA TONIGHT AND SUNDAY. CROSS SECTIONS SHOW A LITTLE MID LEVEL MOISTURE THIS EVENING...AND BETTER UPPER LEVEL MOISTURE FOR LATE DAY SUNDAY. THERE IS VERY LITTLE LOW LEVEL MOISTURE PROGGED AND THE THETA-E AXIS IS EAST OF THE FORECAST AREA BOTH PERIODS. CROSS SECTIONS SHOW THE POTENTIAL INSTABILITY ABOUT THE SAME THIS EVENING AND AGAIN LATE DAY SUNDAY. LAPSE RATES ARE SIMILAR AS WELL...WITH A CAP IN THE MID LAYERS BOTH PERIODS. FORECAST SOUNDS AND GRIDS SHOW NEARLY NO CAPE ACROSS THE FORECAST AREA FOR BOTH PERIODS. WILL GO WITH PERSISTENCE IN THE FORECAST. FOR TEMPERATURES...GRIDS SHOW A 1-2 C WARM-UP ON SUNDAY FROM TODAYS HIGHS. .LONG TERM DISCUSSION...LARGE UPPER LEVEL RIDGE WILL REMAIN CENTERED OVER NEW MEXICO THROUGH THE WEEK. CURRENT FORECAST OF HIGHS IN THE 90S ACROSS THE PLAINS ON TRACK AS LITTLE TEMPERATURE ADVECTION OCCURS. THE ONLY BOUT OF SLIGHT COOLING WE MAY GET WOULD BE ASSOCIATED WITH A MID/UPPER LEVEL MOISTURE PLUME WHICH APPROACHES COLORADO FROM THE SOUTH LATE MONDAY AND SPREADS OVER THE AREA TUESDAY. THIS SHOULD ALSO LEAD TO A SLIGHT INCREASE IN THUNDERSTORM COVERAGE. WILL BUMP UP POPS A BIT TUESDAY AND ALSO SPREAD THEM A BIT FARTHER EAST THAN OTHER DAYS. OTHERWISE...10-20 PERCENT POPS IN AND NEAR THE MOUNTAINS IS GOOD. POTENTIAL FOR WEAK FROPA LATE TUESDAY OR WEDNESDAY BUT SHOULD HAVE VIRTUALLY NO AFFECT ON WEATHER. A MORE REASONABLE ATTEMPT AT A COLD FRONT SHOULD OCCUR NEXT WEEKEND BEHIND A STRONGER SHORT WAVE THAT MOVES ACROSS THE NORTHERN PLAINS. && .BOU...WATCHES/WARNINGS/ADVISORIES...NONE. && KOOPMEINERS/BARJENBRUCH
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1055 AM MDT SAT JUL 31 2004 COZ030>051-011200- JACKSON COUNTY BELOW 9000 FEET-WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET-GRAND AND SUMMIT COUNTIES BELOW 9000 FEET-SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/ NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET-SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/GILPIN/CLEAR CREEK/ SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET-LARIMER AND BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET-JEFFERSON AND WEST DOUGLAS COUNTIES ABOVE 6000 FEET/GILPIN/CLEAR CREEK/NORTHEAST PARK COUNTIES BELOW 9000 FEET-CENTRAL AND SOUTHEAST PARK COUNTY-LARIMER COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY-BOULDER AND JEFFERSON COUNTIES BELOW 6000 FEET/WEST BROOMFIELD COUNTY-NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/ EAST BROOMFIELD COUNTY-ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES ABOVE 6000 FEET-NORTHEAST WELD COUNTY-CENTRAL AND SOUTH WELD COUNTY-MORGAN COUNTY-CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES- NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN COUNTY-SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY-PHILLIPS COUNTY- 1055 AM MDT SAT JUL 31 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS WILL DEVELOP OVER THE MOUNTAINS BY 2 PM THIS AFTERNOON...THEN DRIFT OVER THE FOOTHILLS AND IMMEDIATE PLAINS BY 4 PM. WINDS GUSTS TO 50 MPH ARE POSSIBLE WITH THE STORMS BUT LITTLE RAINFALL. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. KOOPMEINERS/BARJENBRUCH
The Denver radar (KFTG), 35 km away, was scanning. The volume nearest the first event began at 21:59 UTC.
1 thunderstorm wind. Local standard time, as filed.
Strong thunderstorm winds downed a 65-ft blue spruce in Parker. The tree landed onto a home, damaging the roof of the residence. Dozens of holes poked into the shingles and gutters were damaged.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2004Every state in 2004This day in weather historyWarnings in Colorado, July 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: 5417175.