3 hail, 2 lightning, 1 high wind, as filed by the National Weather Service.
Every event with a place to put it; 3 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 20, 2:15 AM MST, 11 hours 35 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER CO 315 AM MDT SUN JUN 20 2004 .SHORT TERM...STRATUS/FOG ALREADY HAS SET IN ACROSS FAR NERN CO AND IS NOW EXPANDING ACROSS URBAN CORRIDOR AND ACROSS THE PALMER DIVIDE ATTM. FOG HAS BECOME DENSE IN SOME AREAS PER SFC OBS AND QUESTION ON WHETHER A DENSE FOG ADVISORY WILL BE NEEDED. THERE STILL CONTINUES TO BE ELEVATED CONVECTION RIDING ACROSS MTNS AND PTNS OF PLAINS AND THIS MAY BE JUST ENOUGH TO KEEP BOUNDARY LAYERS MIXED ENOUGH TO PREVENT WIDESPREAD DENSE FOG EPISODE. WILL MONTIOR THIS AND ADVISORY WILL PROBABLY BE A GAME TIME DECISION AT ZONE ISSUANCE. ALSO FOR THIS MORNING...WILL LEAVE ISOLD POPS IN MOST AREAS DUE TO ONGOING CONVECTION UPSTREAM WHICH IS UNLIKLEY TO STOP. MAIN QUESTION TODAY IS THUNDERSTORM DEVELOPMENT POTENTIAL AND SEVERITY. MODELS CONTINUE TO BE OVER ZEALOUS ON AMOUNT OF WARMING AT LOW LVLS AND THIS DAY MAY BE NO DIFFERENT. A COMPARISON OF ETA BUFFER AND ACTUAL SOUNDING AT 00Z DNR SHOWED MODEL INITIALIZATION REALLY SMOOTHED THE STRONG INVERSION AT 760 MB HENCE THE MUCH WARMER TEMPS INDCIATED IN THE MODELS THAN REALITY. MOS GUIDANCE WAS OFF AVG 10-20 DEGREES YESTERDAY AND THIS HAS BEEN TRUE THE PAST SEVERAL DAYS. GUIDANCE TODAY STILL LOOKS TOO WARM HAS THINK WE WILL STILL HAVE TROUBLE COMPLETELY ERODING THE CAP. NOW THERE IS QUITE A BIT OF UPPER LEVEL SUPPORT WITH A SERIES OF WEAK DISTURBANCES RIDING ALONG THE WESTERLY FLOW AHD OF THE BIG LOW ACROSS THE PAC NW COAST. QUITE A BIT OF CONVECTION STILL ONGOING ACROSS PTNS OF NW CO...WY..AND ID. AS THIS STRONG UPPER LEVEL TROF SAGS SOUTHWARD...90KT JET WILL RIDE BY ACROSS WY AND PUT NERN CO IN FAVORABLE ASCENT PTN OF JET...ESP TNT. SO FEEL THERE APPEARS TO BE ENOUGH DYNAMICS TO OVERCOME ANY SFC INHIBITIONS. STRONGEST STORMS THOUGH WILL STILL BE ON THE HIGHER TERRAIN AREAS...SOMEWHAT LIKE YESTERDAY. MM5 SUPPORTS THESE CONCLUSIONS WITH INITIAL DEVELPMENT OVER THE FRONT RANGE FOOTHILLS AND THEN ACROSS SECTIONS OF THE PALMER DIVIDE. SHOULD ALSO BE A LOT OF ACTIVITY DEVELOPING AND MOVING INTO NERN CO FROM THE CYS RIDGE ESPECIALLY AS THE JET MAX GETS CLOSER. SOME OF THE STORMS WILL BECOME SEVERE WITH CAPES NEAR 2000J/KG AND STRONG MID LVL FLOW AROUND 40KT. LARGE HAIL WOULD BE THE MAIN THREAT. NEXT STRONG SURGE EXPECTED INTO NERN CO LATER TNT WITH INCREASE IN LOW LVL MSTR AGAIN WITH DEVELOPMENT OF STRATUS/FOG. EXPECT SHOWERS/TS TO CONTINUE FOR A GOOD PART OF THE NIGHT AS NERN CO REMAINS IN FAVORABLE ASCENT REGION OF JET. HIGH SCT POPS LOOKS IN THE OFFERING BUT NOT QUITE READY TO GO LIKELY YET. DAY SHIFT CAN HAVE ANOTHER LOOK AT IT. .LONG TERM DISCUSSION...SHORTWAVE TROUGH ROUNDING BOTTOM OF BROAD LONG WAVE TROUGH COMPLEX OVER CENTRAL AND EASTERN CANADA PROGGED TO SWEEP ACROSS NERN COLORADO MONDAY MORNING. A SFC FRONTAL BOUNDARY ASSOCIATED WITH THIS FEATURE IS FCST TO BE SOUTH OF THE AREA BY THEN. QG GRIDS SHOW INCREASING MID-LEVEL ASCENT OVER THE FRONT RANGE AND NRN MTNS DURING THE MORNING HOURS AND WIND GRIDS SHOW MOIST POST-FRONTAL UPSLOPE FLOW ALONG AND EAST OF THE FRONT RANGE FOR MOST OF THE DAY. EXPECT TO SEE MOSTLY CLOUDY TO OVERCAST SKIES FOR MOST OF THE DAY MONDAY AND AREAS OF FOG IN THE MORNING WITH A 1022 MB SFC HIGH REMAINING TO OUR NORTHEAST DURING THE DAY. QPF GRIDS SHOW UPWARDS OF A TENTH OF INCH OF RAIN ON THE PLAINS BY 00Z...MUCH OF WHICH SHOULD FALL FROM SHOWERS. HOWEVER...MID-LEVEL DESTABILIZATION AND UPWARD FORCING AHEAD OF THE SHORT WAVE PROBABLY ENOUGH TO SPAWN SOME ELEVATED CONVECTION. SHOULD SEE T-STORMS FORMING INITIALLY OVER THE WARMER HIGHER TERRAIN ABOVE THE FRONTAL INVERSION BY MIDDAY. MOS GUIDANCE GIVING MONDAY MAX TEMPS IN THE MID TO UPPER 60S ON THE PLAINS...ALTHOUGH SHOULD WE REMAIN SOCKED IN WITH CLOUDS...MAY AGAIN SEE TEMPS NOT CLIMBING OUT OF THE 50S. ALTHOUGH TEMPS ALOFT NOT AS COOL AS THEY WERE LAST WEDNESDAY. MONDAY NIGHT BOUNDARY LAYER RHS BECOMES SATURATED AGAIN...SO ANOTHER ROUND OF FOG A POSSIBILITY FOR PORTIONS OF THE PLAINS. BY TUESDAY...WARMER AND SOMEWHAT DRIER CONDITIONS RETURN TO AREAS EAST OF THE MTNS AS AN UPPER RIDGE MOVES IN FROM THE WEST. HOWEVER S/SELY LOW LEVEL WINDS EXPECTED TO ADVECT IN 50+ DEWPOINT AIR DURING THE DAY AND WITH STRONG SOLAR HEATING... ETA SOUNDINGS SHOW 0-3KM CAPE VALUES IN THE 800-1500 J/KG RANGE ALONG A SFC-700 MB THETA-E RIDGE FROM LIMON TO STERLING ABY LATE AFTERNOON. MAY SEE A FEW SVR STORMS POPPING LATE IN THIS AREA. WEDNESDAY AND BEYOND...BROAD UPPER TROUGH OVER CENTRAL AND EASTERN CANADA THIS WEEK WILL LEAVE THE DOOR OPEN FOR A SERIES OF COOL AIR SURGES TO SLIDE SOUTH ALONG THE ERN SLOPE OF THE ROCKIES. ONE SUCH SURGE MAY MOVE INTO THE AREA THURDAY WITH PERHAPS ANOTHER ONE ON SATURDAY. TIMING AND INTENSITY STILL UP IN THE AIR AT THIS TIME...SO WILL MAKE NO CHANGES TO FCST BEYOND WEDNESDAY. OVERALL...TEMPS SHOULD CONTINUE AT OR BELOW NORMAL AND EACH DAY THERE SHOULD BE AT LEAST A SLIGHT CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS. && .BOU WATCHES/WARNINGS/ADVISORIES...NONE. ENTREKIN/BAKER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1100 AM MDT SUN JUN 20 2004 COZ030>051-211200- 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- 1100 AM MDT SUN JUN 20 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL AGAIN DEVELOP ACROSS THE MOUNTAINS AND MOVE ACROSS PLAINS DURING THE AFTERNOON AND EVENING HOURS. SOME STORMS MAY BECOME SEVERE ALONG THE FOOTHILLS AFTER 2 PM...WITH THE THREAT SHIFTING EASTWARD INTO THE EVENING. LARGE HAIL WILL BE THE MAIN THREAT WITH THE SEVERE STORMS. RECENT RAINS ACROSS SOUTHERN LINCOLN COUNTY HAVE SATURATED THE GROUND. ADDITIONAL RAINFALL COULD CREATE LOCALIZED FLOODING PROBLEMS. THE STORMS WILL LIKELY LAST THROUGH MUCH OF TONIGHT AS ANOTHER COLD FRONT AND UPPER LEVEL DISTURBANCE MOVES ACROSS THE AREA. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY AN ISOLATED THUNDERSTORM WILL BE POSSIBLE DURING THE EARLY MORNING HOURS ACROSS THE FAR NORTHEASTERN PLAINS. OTHERWISE...COOLER AND MORE STABLE AIR INFILTRATING THE AREA WILL PUT A LID ON CONVECTION ACROSS THE PLAINS FOR MONDAY. SOME SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE IN THE FOOTHILLS AND NEARBY FRONT RANGE LOCATIONS MONDAY AFTERNOON...BUT NO SEVERE ACTIVITY IS EXPECTED. SOUTHERLY FLOW WILL RETURN FOR TUESDAY AND WEDNESDAY WHICH WILL LEAD TO BETTER CHANCES FOR AFTERNOON THUNDERSTORMS RETURNING TO THE PLAINS. ANOTHER DISTURBANCE WILL MOVE INTO THE AREA THURSDAY AND PERHAPS FRIDAY. THUS...THE THREAT OF SHOWERS AND THUNDERSTORMS WILL CONTINUE THROUGH THE END OF THE WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED AFTER 2 PM. D-L/046
The Denver radar (KFTG), 139 km away, was scanning. The volume nearest the first event began at 21:02 UTC.
3 hail, 2 lightning, 1 high wind. Local standard time, as filed.
Nineteen people were injured by lightning at the Fourth Annual Kremmling Cliff Classic Golf Tournament. The group of people were on a bluff overlooking the town when the lightning struck. Four people had to be hospitalized, two suffered serious injuries.
Lightning struck several bays of hay at the Eastern Colorado Research Center near Akron. Approximately 60 tons of hay was destroyed by the fire.
Strong outflow winds developed from a dry microburst. A peak wind gust of 64 mph (56 kts) was recorded 21 miles north of New Raymer.
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, June 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: 5402195, 5402191, 5402192, 5402193, 5402196, 5402194.