Lightning struck a transmission line in Park County which caused an outage that lasted for about 45 minutes.
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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 struck a transmission line in Park County which caused an outage that lasted for about 45 minutes.
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 Jun 25, 1:50 PM MST, 1 hour 55 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER CO 250 PM MDT FRI JUN 25 2010 .SHORT TERM...CURRENT SATELLITE AND RADAR PICTURES HAVE SOME CONVECTIVE CLOUDINESS OVER THE SOUTHWESTERN FORECAST AREA AND A BIT OVER THE PALMER RIDGE AND OVER THE REST OF THE MOUNTAINS. THE ONLY PLACE WHERE RAIN MIGHT BE IS OVER PARK AND SUMMIT COUNTIES. SURFACE DEWPOINTS ARE DOWN INTO THE 20S AND 30S F OVER MUCH OF THE FORECAST AREA. THE EXCEPTION BEING SOME 50S F CLINGING TO THE FAR NORTHEAST CORNER. TEMPERATURES OVER THE PLAINS ARE CURRENTLY IN THE 95 TO 102 F RANGE. MODELS HAVE SOUTHWESTERLY FLOW ALOFT FOR THE FORECAST AREA AT AROUND 50 KNOTS TONIGHT AND SATURDAY. THE SYNOPTIC SCALE ENERGY IS BENIGN TONIGHT AND SATURDAY. THE BOUNDARY LAYER FLOW LOOKS TO BE MAINLY DRIVEN BY NORMAL DIURNAL PATTERNS WITH A BIT OF DOWNSLOPING THROWN IN. SPEEDS WILL BE PRETTY LIGHT. FOR MOISTURE...BOTH MODELS HAVE QUITE A BIT OF UPPER LEVEL MOISTURE AROUND OVERNIGHT AND SATURDAY. SATELLITE PICTURES SHOWS THIS SOMEWHAT...BUT NOT COMPLETELY. THE LOW LEVEL MOISTURE IS NOT GREAT. THIS EVENING'S DEW POINT PROGGS ARE MAINLY IN 30S F FOR MUCH OF THE FORECAST AREA...WITH SATURDAY AFTERNOON'S UP SOMEWHAT...MAINLY INTO THE 40S FOR MOST AREAS. PRECIPITABLE WATER VALUES ARE IN THE 0.65 TO 0.85 INCH RANGE TONIGHT AND SATURDAY. THERE IS A WEAK THETA-E AXIS OVER CENTRAL COLORADO BY SATURDAY AFTERNOON. THE ONLY CAPE PROGGED OVER THE FORECAST AREA THIS EVENING IS LOCATED OVER PARK COUNTY...THE SOUTHERN FRONT RANGE FOOTHILLS...PALMER RIDGE...AND EXTREME NORTHEAST CORNER. THERE IS BETTER CAPE SATURDAY AFTERNOON...THE BEST ALONG THE FOOTHILLS AND IMMEDIATE PLAINS. THERE IS SOME OVER ALL THE MOUNTAINS AND THE NORTHEAST CORNER AS WELL. THE LAPSE RATE FIELDS KEEP A WEAK TO MODERATE MID LEVEL CAP IN PLACE FOR THE FORECAST AREA THIS EVENING THROUGH SATURDAY AFTERNOON. THE QPF FIELDS HAVE A TAD OF MEASURABLE RAINFALL OVER THE FORECAST AREA TONIGHT...AND SATURDAY AFTERNOON. SO FOR POPS...WILL GO 30%S IN ZONE 37 ONLY...THEN 20%S IN 34 AND 36...WITH 10%S OVER THE PALMER RIDGE AND EASTERN BORDER ZONES. FOR SATURDAY...WILL GO 10-20%S. FOR TEMPERATURES...THICKNESS FIELDS HAVE A 2-3 C COOL DOWN FOR HIGHS ON SATURDAY COMPARED TO CURRENT READINGS. .LONG TERM...UPPER RIDGE AXIS WILL BE ROUGHLY OVER COLORADO THROUGH THE PERIOD. WEAK SHORTWAVES WILL MOVE OVER THE TOP OF THE RIDGE LATE SATURDAY AND AGAIN SUNDAY. THERE WILL BE A WEAK FRONT BEHIND THE SHORTWAVE SATURDAY NIGHT THAT WILL BRING IN COOLER AIR WITH RICHER MOISTURE FOR SUNDAY. THIS WILL PROVIDE A BETTER CHANCE FOR RAIN ON SUNDAY THOUGH IT MAY TAKE A WHILE TO GET WARM ENOUGH...THE USUAL POSTFRONTAL TRADEOFF. MODEL SOUNDINGS SUGGEST CAPES UP TO 1000 J/KG AND MODEST SHEAR...SOME THREAT OF HAIL OR HEAVY RAIN BUT OVERALL THE SEVERE THREAT DOES NOT LOOK TOO GREAT. WITH THE MARGINAL TEMPERATURES THE LIMITED POPS WE HAVE STILL LOOK ALRIGHT. MONDAY IS NOW LOOKING FAIRLY SIMILAR TO SUNDAY. RIDGE STRENGTHENS AGAIN AFTER THAT AND MODELS STILL UNCLEAR ON THE DETAILS. TENDENCY TODAY IS MORE TOWARD KEEPING THE RIDGE AXIS ACROSS COLORADO RATHER THAN LIFTING THE LOW NORTHWARD...MAYBE EVEN A TREND TOWARD A WESTWARD EXTENSION OF THE RIDGE THAT WOULD SHUT OFF MOISTURE. BEST MOISTURE WILL LIKELY BE AROUND TUESDAY BEFORE THE RIDGE STRENGTHENS TOO MUCH...IT REMAINS TO BE SEEN IF THERE WILL BE ENOUGH WARMING ALOFT TO CAP CONVECTION OR WHERE THE BEST MOISTURE WILL BE. BUMPED POPS UP A BIT HIGHER ALONG THE FRONT RANGE ON TUESDAY WHERE COMBINATION OF INGREDIENTS SEEMS MOST LIKELY...THEN A BIT WARMER/DRIER. COULD GET INTO A DRIER WEST/SOUTHWEST FLOW LATE IN THE WEEK THAT COULD PRESENT SOME FIRE WEATHER ISSUES. && .AVIATION...RADAR SHOWS NUMEROUS BOUNDARIES FLOATING AROUND PLAINS THIS AFTERNOON. CONVECTIVE OUTFLOWS ORIGINATING CLOSE TO THE AIRPORT ARE NOT EXPECTED THIS EVENING. THE PRESSURE GRADIENT IS WEAK...WIND SPEEDS OVER 20 KNOTS ARE NOT LIKELY. IFR CONDITIONS WILL PREVAIL TONIGHT AND SATURDAY. THERE MAY BE A SLIGHT CHANCE OF STRONGER CONVECTIVE OUTFLOW WINDS SATURDAY AFTERNOON AFTER 21Z. && .BOU WATCHES/WARNINGS/ADVISORIES...NONE. RJK/GIMMESTAD
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1058 AM MDT FRI JUN 25 2010 COZ030>051-261200- 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- 1058 AM MDT FRI JUN 25 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT THERE MAY BE ENOUGH MOISTURE OVER THE FORECAST AREA TODAY FOR ISOLATED THUNDERSTORMS IN THE MOUNTAINS AND FOOTHILLS...MAINLY SOUTH OF I-70 THIS AFTERNOON...AS WELL AS OVER THE EASTERN HALF OF THE PLAINS LATER THIS AFTERNOON. THE STORMS WILL PRODUCE STRONG...GUSTY ...VARIABLE WINDS WITH VERY LITTLE RAINFALL. HOT TEMPERATURES WILL CONTINUE OVER ALL THE FORECAST AREA TODAY WITH HIGHS EXPECTED TO BE AROUND 10 DEGREES ABOVE SEASONAL NORMALS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE WILL BE A SLIGHT CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS SATURDAY THEN A BETTER CHANCE OF THUNDERSTORMS WITH COOLER TEMPERATURES SUNDAY AND MONDAY. WARMER WEATHER WILL RETURN LATER IN THE WEEK WITH JUST A SLIGHT CHANCE OF THUNDERSTORMS EACH AFTERNOON. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. RJK/GIMMESTAD
The Denver radar (KFTG), 41 km away, was scanning. The volume nearest the first event began at 22:45 UTC.
2 thunderstorm wind, 1 lightning. Local standard time, as filed.
Strong winds from a dry microburst downed several trees in the vicinity of 14th and Federal, and near Bayaud St. and Clarkson St., in Denver.
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, June 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: 247776, 247777, 240633.