2 lightning, 2 flash flood, 1 thunderstorm wind, as filed by the National Weather Service.
Every event with a place to put it; 4 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 1, 2:00 PM MST, 3 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER CO 300 PM MDT TUE AUG 1 2006 .SHORT TERM DISCUSSION...CHANGES WILL BE MINIMAL IN THE SHORT TERM. THE UPPER TROF IS PROGGED TO SLIP ACROSS SRN WY/NRN CO OVERNIGHT AND WEDNESDAY MORNING. AN UPPER LEVEL JET 60 KTS WILL SLIDE ACROSS THE CWFA TNGT WITH SOME UPWARD QG ASCENT ASSOCIATED WITH IT. AS A RESULT...SHOULD SEE SOME SHOWERS CARRY OVER AFTER MIDNIGHT. LAPS SFC BASED CAPES THIS AFTN RANGE FM 300-1300 J/KG ALG THE URBAN CORRIDOR AND NRN BORDER...BUT MUCH LESS EAST OF DENVER...WHERE SOME CIN IS PRESENT AS WELL. WL UP POPS TO LIKELY IN THE MTNS BUT KEEP SCT COVERAGE ELSEWHERE. INTERACTIVE CAPES ONLY IN THE 300-700 J/KG RANGE. ALTHO PW VALUES ARE OVER ONE INCH...INSTABILITY IS NOT THAT SIGNIFICANT. STORM MOTION BETTER AS WELL VS YDA...SO ALTHOUGH SOME STORMS MAY PRODUCE HEAVY RAIN...THE CELL MOTION WILL BE AROUND 15 KTS. FOR THIS REASON WL LAY OFF ANY MENTION OF FLASH FLOOD WATCH. AS FOR WEDNESDAY...AMS WILL BE MORE SUBSIDENT FOLLOWING THE PASSAGE OF THE UPPER TROF. CAPES ARE FAIRLY UNIMPRESSIVE AS WELL...SO WILL FAVOR SCT POPS NEAR OMTNS BUT JUST ISOLD COVERAGE ELSEWHERE. .LONG TERM DISCUSSION...MODELS HAVE THE UPPER RIDGE BUILDING BACK INTO OUR FORECAST LATE WEDNESDAY NIGHT INTO THURSDAY. THIS CONTINUES THROUGH FRIDAY. THE FLOW ALOFT IS PROGGED TO BE WEST-SOUTHWESTERLY AT 55 TO 70 KNOTS WEDNESDAY NIGHT THROUGH FRIDAY. THE BOUNDARY LAYER FLOW IS MAINLY SOUTHERLY IN DIRECTIONS THROUGH THE PERIOD. THE QG VERTICAL VELOCITY FIELDS SHOW NO SYNOPTIC SCALE VERTICAL MOTION FOR THE FORECAST AREA THROUGH FRIDAY. FOR MOISTURE ...THE MODELS SHOW IT TO BE A BIT DRIER WEDNESDAY NIGHT THROUGH FRIDAY THEN THEY DID YESTERDAY...ALTHOUGH THERE IS SOME MOISTURE. PRECIPITABLE WATER VALUES ON FORECAST SOUNDINGS AREA IN THE 0.70 TO 1.00 INCH RANGE THROUGH FRIDAY. BOUNDARY LAYER DEW POINTS ARE IN THE UPPER 30S TO LOWER 50S F RANGE THROUGH FRIDAY. THERE IS A THETA-E AXIS COVERING THE FORECAST AREA THROUGH FRIDAY. CAPE-WISE ...THERE IS LITTLE WEDNESDAY NIGHT...A BIT MORE LATE DAY THURSDAY ...THE BEST LATE DAY FRIDAY. CROSS SECTION SHOW FRIDAYS LAPSE RATES TO BE THE STEEPEST. QPF GRIDS SHOW BEST MEASURABLE PRECIPITATION COVERAGE LATE DAY FRIDAY. WILL MAKE MINOR POPS ADJUSTMENTS. FOR TEMPERATURES...THURSDAY LOOK 1-2 C WARMER THAN WEDNESDAY. FRIDAY LOOKS 1-2.5 C WARMER THAN THURSDAY. FOR SATURDAY THROUGH TUESDAY...MODELS CONTINUE TO SHOW THE UPPER RIDGE CENTER LOCATED EAST-SOUTHEAST OF THE FORECAST AREA THROUGH THE TUESDAY. THERE IS STILL MID AND UPPER LEVEL SUBTROPICAL MOISTURE OVER THE CWA THROUGH THE PERIOD. THICKNESS VALUES KEEP TEMPERATURES AT OR SLIGHTLY ABOVE SEASONAL NORMALS. && .BOU WATCHES/WARNINGS/ADVISORIES...NONE. && COOPER/KOOPMEINERS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1039 AM MDT TUE AUG 01 2006 COZ030>051-021200- 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- 1039 AM MDT TUE AUG 01 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT WIDELY SCATTERED RAIN SHOWERS WILL LINGER OVER THE NORTHERN BORDER THROUGH THE REMAINDER OF THE MORNING. SCATTERED SHOWERS AND THUNDERSTORMS WILL REDEVELOP OVER THE MOUNTAINS AND FOOTHILLS AROUND MIDDAY...AND THEN SPREAD ACROSS THE PLAINS DURING THE AFTERNOON AND EVENING HOURS. ALTHOUGH MOISTURE...INSTABILITY...AND WIND SHEAR IN THE ATMOSPHERE HAVE ALL INCREASED SINCE YESTERDAY...THE THREAT OF SEVERE WEATHER WILL BE LOW. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THERE IS PLENTY OF MID AND UPPER LEVEL SUBTROPICAL MOISTURE EXPECTED FOR THE FORECAST AREA FOR MUCH OF THE PERIOD. AS A RESULT THERE WILL BE A CHANCE OF LATE DAY SHOWERS AND THUNDERSTORMS FOR THE MOUNTAINS AND FOOTHILLS. THERE WILL BE A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS FOR THE PLAINS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. COOPER/KOOPMEINERS
The Denver radar (KFTG), 28 km away, was scanning. The volume nearest the first event began at 00:48 UTC.
2 lightning, 2 flash flood, 1 thunderstorm wind. Local standard time, as filed.
Lightning struck a transformer at an RTD Light Rail station at Interstate 25 and Yosemite.
Lightning sparked a fire at a home in Lone Tree.
Strong thunderstorm winds knocked down a tree.
Heavy rain forced the closure of Arapahoe Road as it was inundated with high water between Holly and Quebec. Flooding was also reported near Park Meadows Mall and Greenwood Village.
Heavy rain caused flooding in Highlands Ranch, Lone Tree and Parker. Water up to 6 inches deep was reportedly running over the roads.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2006Every state in 2006This day in weather historyWarnings in Colorado, August 2006
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: 5528223, 5528224, 5528225, 5528221, 5528222.