1 lightning, as filed by the National Weather Service.
Every event with a place to put it; 1 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 Jun 12, 1:30 PM MST, 1 hour earlier.
NORTHEAST AND NORTH CENTRAL COLORADO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER CO 230 PM MDT THU JUN 12 2003 SHORT TERM DISCUSSION...CONVECTION UNDERWAY OVR THE FRONT RANGE AND WESTERN PORTIONS OF THE PALMER DVD AT THIS HOUR. FLASH FLOOD WARNING HAS ALREADY BEEN ISSUED FOR THE HAYMAN BURN AREA OF DOUGLAS CTY AS T-STORMS STILL BACK BUILDING VRY SLOWLY OVR THE AREA. AS FOR THE REST OF FRONT RANGE...BLV THREAT OF HVY RAINFALL NOT AS HIGH AS SFC DEW POINTS AND CAPES NOT AS GREAT IN THESE AREAS. SHOULD SEE HIGH COUNTRY STORMS DRIFTING E/NEWRD OVR THE FTHLS AND ADJACENT HIGH PLAINS NEXT SEVERAL HOURS WITH SMALL HAIL...POTENTIAL WND GUSTS TO 50KT...BRIEF HVY RAIN AND FQT LIGHTNING THE MAIN THREATS. ATTENTION SHIFTS TO SERN PORTIONS OF THE CWFA THIS EVENING WHERE MESOETA AND GFS SHOW INCREASING SFC DEW POINTS AND BLYR CAPES ALONG WITH INCREASING SELY LOW-LVL FLOW. MESOETA PRECIP ACCUM GRIDS INDICATE UPWARDS OF 1.5 INCH OF RAIN ALG A QUASI-STATIONARY WIND SHIFT BOUNDARY ALIGNED WEST-EAST ACRS ELBERT AND LINCOLN COUNTIES THRU LATE EVE HOURS. WEAK/MDT SHEAR ALONG THIS BOUNDARY MAY PROVIDE ENOUGH TURNING TO PRODUCE A BRIEF LANDSPOUT OR TWO UNDER THE MULTI-CELL STORM CELLS IN THE AREA. UPSTREAM OVR WRN CO A WEAK PRES WAVE BTWN 700-400MBS IS PROGD TO MOV OVR THE CWFA BTWN 06Z AND 09Z. THIS COULD FURTHER EXTEND THE LIFE SHWRS/T-STORMS ON THE PLAINS...ESPLY IN THE FAR NERN COUNTIES...THRU DAWN. CAN/T RULE OUT ONE OR TWO SVR STORMS OVRNIGHT. FRIDAY...E/SELY LOW AND MID-LVL FLOWS EAST OMTNS DEEPENS BUT DOES NOT NECESSARILY STRENGTHEN THRU THE MORNING HRS WHILE THE WLY FLOW ALOFT REMAINS QUITE LIGHT. PRECIPITABLE H20 VALUES ALSO A BIT HIGHER FRIDAY PRIOR TO PASSAGE OF MID-LVL SHORTWV TROF. APRS A FAIRLY VIGOROUS SHORTWV MOVS ACRS THE I-25 URBAN CORRIDOR BY MID-AFTERNOON WITH DRIER AND MORE STABLE AIR SPREADING OVR THE MTNS THRU THE DAY. THE INCREASED CLOUD CVR SHOULD ALSO CONTRIBUTE TO THE LOWER TEMPS XPCTD TOMORROW. MOS TEMP GUIDANCE INDICATING A 5-10 DEG F COOL DOWN...LOOKS REASONABLE. BAKER LONG TERM DISCUSSION...MDLS IN VRY POOR AGMNT OVERALL DURG THE XTNDD PD. SOME SORT OF RDG WL BLD ACRS THE WRN UNITED STATES...HWVR...THE LCN AND AMPLITUDE OF THE RDG ELUDES THE MDLS ATTM. FRIDAY NGT... MID-LVL FEATURE ASSCTD WITH THE PRECIP GENERATION FRIDAY WL SHIFT EWD INTO KS. FLOW ALF WL TURN TO A NWLY DOWNSLOPING DIRECTION WITH RAPID DRYING AT ALL LVLS AFT 00Z SAT. PCPN SHUD COME TO AN END QUICKLY DURG THE EVENING HOURS FRIDAY NGT WITH CLRG SKIES AFT MIDNIGHT. IF ENUF RAINFALL OCCURS FRI...WDSPD FOG MAY BE A PSBLTY ACRS THE PLAINS SAT MRNG. SAT WL BE DRIER AND WRMR...WHICH WL BE THE THEME OF THE DAY 4-7 PERIOD. SOME RESIDUAL MSTR ARND H5 WL CONT THRU THE PD WHICH WL LEAD TO DAILY AFTN AND EVENING TSTMS. MOST OF THESE SHUD BE TERRAIN HUGGERS SINCE FLOW AND MSTR TOO SLIGHT TO CARRY THE PCPN INTO THE PLAINS. TEMPS MAY EDGE SLGTLY ABV NRML SUN AND MON...THEN RETREAT DOWNWARD TWD NRML BY MIDWEEK. 46 .DEN...NONE.
COZ030>051-131200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1125 AM MDT THU JUN 12 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS WILL FORM FIRST OVER THE FRONT RANGE AND ALONG THE CONTINENTAL DIVIDE. LOOK FOR LIGHT WEST WINDS ALOFT TO CARRY THESE STORMS OUT OVER THE ADJACENT HIGH PLAINS BETWEEN 12:30 AND 2 PM. THE FIRST LINE OF THUNDERSTORMS MOVING OFF THE FRONT RANGE AND OVER THE I-25 URBAN CORRIDOR SHOULD BE HIGH BASED DUE TO THE RELATIVELY LOW DEW POINT TEMPERATURES IN PLACE. STILL THESE STORMS WILL BE CAPABLE OF FREQUENT CLOUD-TO-GROUND LIGHTNING AND STRONG AND GUSTY WINDS. AS STORMS CONTINUE TO MOVE OFF THE FRONT RANGE EXPECT THE ATMOSPHERE WILL BECOME INCREASINGLY MOIST AND UNSTABLE. THUNDERSTORMS LATER THIS AFTERNOON OVER AND NEAR THE FRONT RANGE WILL BE CAPABLE OF HAIL AND STRONG DAMAGING WINDS. DUE TO LIGHT STEERING WINDS ALOFT...SOME OF THESE STORMS MAY ALSO PRODUCE LOCALLY HEAVY RAINFALL. FARTHER OUT ON THE PLAINS WHERE THE ATMOSPHERE WILL BE EVEN MORE MOIST AND UNSTABLE...SCATTERED THUNDERSTORMS ARE EXPECTED TO BEGIN FORMING AFTER 3 PM. SOME OF THESE STORMS MAY BECOME SEVERE LATE THIS AFTERNOON AND THIS EVENING...PARTICULARLY THOSE EAST OF A CHEYENNE WYOMING TO BURLINGTON COLORADO LINE. LARGE DAMAGING HAIL...VERY HEAVY RAIN AND EVEN ISOLATED SHORT-LIVED TORNADOES OR LANDSPOUTS WILL BE THE MAIN THREAT WITH THESE STORMS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY SCATTERED THUNDERSTORMS ARE EXPECTED THROUGH THE DAY FRIDAY. A MID LEVEL DISTURBANCE WILL KEEP THE THREAT OF SHOWERS AND THUNDERSTORM CONTINUING FRIDAY MORNING AND THROUGH THE AFTERNOON HOURS. WEAK UPSLOPE FLOW COMBINED WITH SUBSTANTIAL ATMOSPHERIC INSTABILITY WILL LEAD TO A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE FAR NORTHEAST PLAINS IN THE AFTERNOON. THE PRIMARY THREAT FROM THESE STORMS WILL AGAIN BE HAIL. AFTER THIS DISTURBANCE DEPARTS SATURDAY...A SLIGHTLY DRIER WEATHER PATTERN WILL BECOME ESTABLISHED ACROSS COLORADO. SOME MOISTURE WILL LINGER HOWEVER...SO ISOLATED AFTERNOON SHOWERS AND THUNDERSTORMS WILL STILL BE IN THE FORECAST FOR THE NEXT SEVERAL DAYS. THE MAJORITY OF THE STORMS WILL STAY IN THE HIGH COUNTRY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED WITHIN THE I-25 URBAN CORRIDOR AFTER 2 PM MDT TODAY. BAKER/046/BURROUGHS
The Denver radar (KFTG), 61 km away, was scanning. The volume nearest the first event began at 21:30 UTC.
1 lightning. Local standard time, as filed.
Lightning blew a hole in the roof of a home in Highlands Ranch. The bolt knocked several holes in the bedroom ceilings and damaged the home's electrical system.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2003Every state in 2003This day in weather historyWarnings in Colorado, June 2003
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: 5368203.