Lightning sparked a house fire, causing extensive damage.
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 episode as NWS BOU wrote it up.
Lightning sparked a house fire, causing extensive damage.
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, 2:28 PM MST, 1 hour 2 minutes earlier.
AREA FORECAST DISCUSSION...CORRECTION TO TIME NATIONAL WEATHER SERVICE DENVER CO 328 PM MDT WED AUG 4 2010 .SHORT TERM...HEALTHY BATCH OF SHOWERS AND THUNDERSTORMS CURRENTLY MOVING ACROSS GRAND AND LARIMER COUNTIES ASSOCIATED WITH SHORTWAVE OVER NORTHWEST COLORADO. OTHER STORMS MOVING ACROSS SUMMIT AND PARK COUNTIES...THOUGH ONLY ISOLATED IN COVERAGE AT THIS POINT. MORE CONVECTION SOUTHWEST OF CWA LOOKS TO BE ASSOCIATED WITH A WEAK SHORTWAVE. NO STORMS YET ALONG FOOTHILLS OR ACROSS PLAINS. ACARS SOUNDINGS STILL SHOW A MODEST 500 MB CAP IN PLACE. RUC SEEMS TO HAVE THE BEST HANDLE ON SHORTWAVE IN NORTHWEST COLORADO...THOUGH WEAKENS THE WAVE AS IN MOVES ONTO PLAINS. OTHER MODELS SHOW A BROAD AREA OF QG ASCENT. WILL BASE THIS EVENING'S FORECAST MAINLY ON THE RUC. WAVE MOVING ACROSS NORTHERN COLORADO SHOULD BE ENOUGH TO OFFSET CAP ACROSS NORTHERN SECTIONS OF PLAINS...WITH SHOWERS AND STORMS HOLDING TOGETHER. INCREASED POPS TO LIKELY FOR ZONES 38 AND 42 FOR THIS EVENING. LIKELY POPS STILL SEEM REASONABLE SOUTHERN SECTIONS OF CFWA AS WAVE IN SOUTHWEST COLORADO MOVES THROUGH. FOR REMAINDER OF THE PLAINS...STILL SOME QUESTION WHETHER STORMS CAN BREAK CAP AND SUSTAINED THEMSELVES. MAY NEED SOME HELP FROM BOUNDARIES. PRECIPITABLE WATER VALUES HOVERING AROUND AN INCH. HEAVY RAIN STILL A CONCERN WITH THE STORMS...THOUGH MOVEMENT AROUND 10KTS WHICH SHOULD KEEP FLASH FLOOD CONCERN LOW. HELD OFF ON A FLASH FLOOD WATCH GIVEN STORM MOVEMENT. WAVES SHOULD EXIT CFWA BY MIDNIGHT...THOUGH MODELS KEEP SOME WEAK QG ASCENT IN PLACE OVERNIGHT. WILL KEEP THE SLIGHT CHANCE GOING. ON THURSDAY...RIDGE AXIS SLOWLY SHIFTS FROM TEXAS WEST INTO NEW MEXICO DURING THE DAY. STILL A WEAK WEST TO SOUTHWEST FLOW ALOFT OVER COLORADO. MODELS INDICATE A SLIGHTLY DRIER AIRMASS OVER AREA...WITH PRECIPITABLE WATER VALUES AROUND EIGHT TENTHS ACROSS PLAINS AND SIX TENTHS OVER MOUNTAINS. MODERATE DAYTIME HEATING ALONG WITH THE FAIRLY MOIST ATMOSPHERE WILL BE SUFFICIENT FOR THE DEVELOPMENT OF SHOWERS AND THUNDERSTORMS BY THE AFTERNOON ACROSS THE MOUNTAINS. PLAINS STILL SHOWING A BIT OF A CAP DURING THE AFTERNOON. SO STORM DEVELOP COULD AGAIN BE DELAYED. WILL KEEP THE CHANCE POPS FOR MOUNTAINS...FOOTHILLS AND URBAN CORRIDOR. SLIGHT CHANCE STILL REASONABLE FOR AREAS EAST OF URBAN CORRIDOR. THREAT OF HEAVY RAIN STILL EXISTS WITH A FEW STORMS. TEMPERATURE AND THICKNESS PROGS SHOW HIGHS AGAIN IN THE 80S ACROSS PLAINS WITH 60S AND A FEW 70S MOUNTAINS. CURRENT TEMPERATURE GRIDS LOOK ON TRACK .LONG TERM...MODELS SHOW LITTLE CHANGE IN THE SYNOPTIC SCALE PATTERN THURSDAY NIGHT THROUGH SATURDAY NIGHT...WITH THE UPPER RIDGE CENTER SOUTH-SOUTHEAST OF COLORADO AND SOUTHWESTERLY FLOW ALOFT FOR THE FORECAST AREA. THERE IS BENIGN SYNOPTIC SCALE ENERGY FOR THE FORECAST AREA THROUGH THE PERIODS. THE LOW LEVEL WINDS ARE PROGGED TO BE EAST-SOUTHEASTERLY FOR THE PLAINS AND FOOTHILLS THURSDAY EVENING...LATE DAY FRIDAY AND LATE DAY SATURDAY. FOR MOISTURE... IT'S BEST THURSDAY NIGHT...WITH A GRADUALLY DRYING TREND THROUGH SATURDAY. THE BOUNDARY LAYER DEW POINT TEMPERATURES ARE PROGGED IN THE 50S AND LOWER 60S FOR THE PLAINS AND LOWER FOOTHILLS THURSDAY NIGHT. THEY DRY OUT INTO THE 40S F OVER THE WESTERN PLAINS FRIDAY LATE DAY. ON SATURDAY...DEW POINTS ARE IN THE 40S OVER ALL THE PLAINS. PRECIPITABLE WATER VALUES ARE IN THE 0.90 TO 1.25 INCH RANGE THURSDAY NIGHT. ON FRIDAY AND FRIDAY NIGHT THE VALUES DECREASE INTO THE 0.60 TO 0.80 INCH RANGE FOR SATURDAY. THE ONLY DECENT THETA-E AXIS IS PROGGED OVER THE EASTERN BORDER AREA THURSDAY EVENING INTO FRIDAY EVENING. THERE IS PRETTY DECENT CAPE PROGGED OVER THE FORECAST AREA THURSDAY EVENING. VALUES ACROSS THE PLAINS ARE GREATER THAN 1000 J/KG. THE DECENT CAPE IS CONFINED TO THE SOUTH CENTRAL AND EASTERN FORECAST AREA FOR LATE DAY FRIDAY. ON LATE DAY SATURDAY...THERE IS A TAD OF CAPE OVER THE MOUNTAINS AND FOOTHILLS. THE LAPSE RATE FIELDS HAVE A SLIGHT MID LEVEL CAP IN PLACE THURSDAY EVENING...AND THERE IS EVEN LESS OF A CAP FOR LATE DAY FRIDAY AND LATE DAY SATURDAY. THE GFS QPF FIELDS HAVE MEASURABLE RAINFALL ACROSS ALL THE FORECAST AREA THURSDAY EVENING ...THE LIGHTEST AMOUNTS OVER THE FAR EAST. THE NAM JUST HAS LIGHT AMOUNTS OVER THE PLAINS AND FOOTHILLS THURSDAY EVENING. BOTH MODELS SHOW A TAD OF RAIN IN MOST AREAS LATE DAY FRIDAY. BY LATE DAY SATURDAY...THERE IS A SMIDGEN OF MEASURABLE RAINFALL PROGGED MAINLY OVER THE MOUNTAINS. FOR POPS...WILL GO WITH 30-40%S THURSDAY EVENING...THEN 10-20%S FOR LATE DAY FRIDAY AND LATE SATURDAY. FOR TEMPERATURES...FRIDAY'S HIGHS ARE 2-3 C WARMER THAN THURSDAY'S. SATURDAY'S HIGHS ARE 0.5-1.5 C WARMER THAN FRIDAY'S. FOR THE LATER DAYS...SUNDAY THROUGH WEDNESDAY...MODELS PUT THE CENTER OF THE UPPER RIDGE EAST-SOUTHEAST OF COLORADO THROUGH ALL FOUR DAYS. THE FLOW ALOFT REMAINS SOUTHWESTERLY FOR THE FORECAST AREA. MOISTURE LOOKS PRETTY GOOD SUNDAY AND MONDAY...THEN THERE IS LESS ON TUESDAY AND WEDNESDAY. && .AVIATION...STILL A CHANCE FOR STORMS ACROSS DENVER AREA THROUGH 04Z WHICH COULD AFFECT AREA AIRPORTS. BRIEF HEAVY RAIN AND OUTFLOW WINDS TO 40 KTS THE MAIN CONCERN WITH MVFR CONDITIONS POSSIBLE. A FEW SHOWERS COULD LINGER OVERNIGHT. VFR CONDITIONS TO PREVAIL...THOUGH SOME STRATUS COULD DEVELOP IN THE 10Z-15Z TIME FRAME WITH CEILINGS IN THE 3000-5000 FOOT RANGE. OTHERWISE...CHANCE FOR THUNDERSTORMS AFTER 18Z WITH BEST CHANGE FROM 21Z TO 00Z. BRIEF HEAVY RAIN AND GUSTY OUTFLOW WINDS THE MAIN CONCERNS WITH POSSIBLE MFR CONDITIONS. && .BOU WATCHES/WARNINGS/ADVISORIES...NONE. D-L/RJK
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1057 AM MDT WED AUG 04 2010 COZ030>051-051200- 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- 1057 AM MDT WED AUG 04 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON AND EVENING ACROSS NORTHEAST AND NORTH CENTRAL COLORADO. THE BEST CHANCE FOR STORMS WILL AGAIN BE SOUTH OF INTERSTATE 70. THE STORMS WILL BE SLOW MOVING AND COULD PRODUCE HEAVY RAIN WITH RAINFALL RATES UP TO 3 INCHES PER HOUR. THE HEAVY RAIN MAY CAUSE LOCALIZED FLOODING. THE SHOWERS AND STORMS WILL DECREASE THIS EVENING THOUGH A FEW SHOWERS COULD LINGER OVERNIGHT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE WILL BE A CHANCE OF SHOWERS AND THUNDERSTORMS THURSDAY ...DECREASING TO A SLIGHT CHANCE OF LATE DAY SHOWERS AND THUNDERSTORMS FRIDAY AND SATURDAY. MOISTURE WILL INCREASING LATER IN THE WEEKEND AND EARLY NEXT WEEK...SO A CHANCE OF SHOWERS AND THUNDERSTORMS ARE EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. HOWEVER... REPORTS OF HEAVY RAIN AND FLOODING WILL BE APPRECIATED. D-L/RJK
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 411 PM MDT WED AUG 4 2010 COZ040-041-042245- NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/EAST BROOMFIELD COUNTY CO- ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES ABOVE 6000 FEET CO- 411 PM MDT WED AUG 4 2010 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL DOUGLAS COUNTY SOUTHWESTERN ARAPAHOE COUNTY AT 412 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL. THIS STORM WAS LOCATED 4 MILES SOUTHEAST OF CENTENNIAL...OR 13 MILES SOUTHEAST OF DENVER. THIS STORM WAS NEARLY STATIONARY. LOCATIONS IN THE ADVISORY INCLUDE BUT ARE NOT LIMITED TO GREENWOOD VILLAGE AND CENTRAL CENTENNIAL. PRECAUTIONARY/PREPAREDNESS ACTIONS... HEAVY RAINS MAY ALSO OCCUR WITH THIS STORM...WHICH MAY FLOOD LOW-LYING AREAS SUCH AS DITCHES AND UNDERPASSES. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. && LAT...LON 3952 10476 3950 10492 3962 10495 3963 10483 TIME...MOT...LOC 2212Z 308DEG 2KT 3956 10486 KRIEDERMAN
The Denver radar (KFTG), 42 km away, was scanning. The volume nearest the first event began at 22:32 UTC.
1 lightning. Local standard time, as filed.
Lightning struck a residence and sparked a fire. The fire migrated in the space between the first and second floor.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2010Every state in 2010This day in weather historyWarnings in Colorado, August 2010
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: 252470.