Heavy rain produced flash flooding in the High Park burn area. Numerous mud and debris slides were reported near Poudre Park.
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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.
Heavy rain produced flash flooding in the High Park burn area. Numerous mud and debris slides were reported near Poudre Park. Some of the slides covered to roadway to a depth of one foot. Mud and debris also covered a section of State Highway 14, forcing its closure. In addition, Rist Canyon was closed at Stove Prairie.
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 Jul 6, 10:16 AM MST, 3 hours 19 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER CO 1116 AM MDT FRI JUL 6 2012 .UPDATE... && .SHORT TERM...CURRENT SATELLITE AND RADAR PICTURES ARE SHOWING THE CONVECTION DEVELOPING OVER THE MOUNTAINS AND FOOTHILLS. CELLS WILL BE MOVING NEAR DUE NORTH AGAIN TODAY. COMPARING YESTERDAY'S 17Z DIA OBSERVATION TO THE CURRENT 17Z VERSION...IT IS 82 OVER 52 CURRENTLY WHILE YESTERDAY IS WAS 82 OVER 55. HOWEVER...WE CONTINUE TO HAVE A FETCH OF WIDESPREAD MID 50S DEW POINT UPSTREAM IN THE NORTHEASTERLY UPSLOPE FLOW. WILL STAY THE COURSE WITH GOING FORECAST. COOLER MORE MOIST CONDITIONS ARE NEEDED. .AVIATION...WINDS AT DIA ARE EAST-NORTHEASTERLY AT THIS TIME. THEY SHOULD STY MORE NORTHWESTERLY THE REST OF THE AFTERNOON AND THIS EVENING. RJK && .PREV DISCUSSION... /ISSUED 440 AM MDT FRI JUL 6 2012/ SHORT TERM...THE BROAD UPPER HIGH CONTINUES TO MEANDER AROUND THE CENTRAL PLAINS STATES WITH A RESULTING MOIST SOUTHERLY FLOW ALOFT ACROSS COLORADO. WATER VAPOR IMAGERY SHOWING THE PLUME OF MOISTURE IS WELL ESTABLISHED ACROSS CENTRAL AND WESTERN PORTIONS OF COLORADO...WHILE DRIER AIR IS STILL HOLDING ACROSS FAR EASTERN COLORADO. PRECIPITABLE WATER VALUES FROM GPS ARE OVER AN INCH ACROSS MUCH OF THE AREA THIS MORNING. AT THE SURFACE...DEWPOINTS ARE IN THE 50S ACROSS MUCH OF THE PLAINS WITH THE SURFACE TROF ACROSS MUCH OF EASTERN COLORADO. HARD TO TELL WHERE THE FRONTAL BOUNDARY IS AT THIS TIME WITH VERY LITTLE PRESSURE RISE REFLECTION ACROSS WYOMING. MODELS STILL SHOWING WEAK UPSLOPE FLOW DEVELOPING THIS MORNING THOUGH IT WILL BE SHALLOW. HARD TO REALLY MAKE MANY CHANGES IN THIS UPCOMING FORECAST PACKAGE WITH THE TREND FOR HIGHER CHANCES OF STORMS AND COOLING TEMPERATURES STILL LOOK ON TRACK. HOWEVER STILL A LITTLE SUSPECT OF MODEL DEPICTION OF TOO MUCH LOW LEVEL MOISTURE...ESPECIALLY SINCE THEY HAVE BEEN CONSISTENTLY TOO WET FROM THE PAST FEW DAYS AS COMPARED TO REALITY. LATEST LOOK AT THE HRRR ACTUALLY DROPS DEWPOINTS INTO THE LOWER 40S OVER THE FRONT RANGE WHICH WOULD CUT DOWN ON THE INSTABILITY. BEST CHANCES FOR STORMS AGAIN MOUNTAINS...FOOTHILLS AND SEEPING OUT ONTO THE ADJACENT PLAINS. LOWER POPS FURTHER EAST IN THE DRIER AIR. LONG TERM...SOUTHERLY FLOW ON THE WESTERN EDGE OF TALL UPPER RIDGE OVER THE GREAT PLAINS WILL CONTINUE TO ADVECT AMPLE AMOUNTS OF MOIST SUBTROPICAL AIR UP OVER COLORADO DURING THE UPCOMING WEEKEND. IN ADDITION..A PERSISTENT EASTERLY LOW-LEVEL FLOW ON THE PLAINS WILL CONTINUE TO PUSH MOIST BOUNDARY LAYER AIR UPSLOPE. WITH MEAN LAYER SPECIFIC HUMIDITIES IN THE 6-8 G/KG RANGE AND PRECIPITABLE WATER VALUES IN THE 1 TO 1.5 INCH RANGE...CHANCES ARE GOOD WE/LL SEE PERIODS OF MEASURABLE RAINFALL FROM THUNDERSTORMS AT LEAST MONDAY MORNING. THE BEST CHANCE FOR THIS PRECIP APPEARS TO BE LATE SATURDAY AFTERNOON AND OVERNIGHT AND SUNDAY AFTERNOON AND EVENING... ..AND PARTICULARLY OVER AND ALONG THE FRONT RANGE WHERE MODEL QPF FIELDS INDICATE PRETTY IMPRESSIVE RAIN TOTALS BY MONDAY. AS WAS NOTED ABOVE IN THE SHORT TERM DISCUSSION...MODELS ESPLY THE GFS HAVE BEEN OVER DOING QPF AMOUNTS AND ATMOSPHERIC MOISTURE FOR SOME TIME NOW. WITH THAT IN MIND...KEPT PRECIP AMOUNTS IN THE FCST GRIDS BELOW VALUES OFFERED BY THE MODELS...HOWEVER WILL HANG ONTO THE 40-50 PCT POPS ON THE PLAINS AND WESTERN VALLEYS AND LIKELY POPS AT MTN LOCATIONS PRETTY MUCH FOR THE ENTIRE WEEKEND. FURTHERMORE...MOIST UPSLOPE FLOW...WIDESPREAD CLOUD COVER AND PERIODS OF PRECIP WILL HAVE A BIG INFLUENCE ON TEMPERATURES THIS WEEKEND. MODEL TEMPERATURES GUIDANCE GENERALLY INDICATING HIGHS IN THE 70S AT LOWER ELEVATIONS AND 50-60S IN THE HIGH COUNTRY. CAN/T ARGUE WITH THAT...ALTHOUGH TEMPERATURES OFFERED BY THE GFS APPEAR TOO COOL EVEN WITH ALL OF THE CLOUD COVER ANTICIPATED. BY EARLY NEXT WEEK...THE UPPER RIDGE WOBBLING OVER THE CENTRAL GREAT PLAINS IS FORECAST TO SHIFT WESTWARD OVER THE CENTRAL ROCKY MTN REGION LATE IN THE WEEKEND AND BECOME CENTERED OVER THE EASTERN GREAT BASIN BY MONDAY. THIS CAUSES WINDS ALOFT..ALBEIT IT LIGHT WINDS...TO REVERSE AND COME FROM A NORTHERLY DIRECTION OVER THE FORECAST AREA...CONSEQUENTLY CAUSING THE MONSOON MOISTURE PLUME TO DIVERT WESTWARD OVER THE DESERT SOUTHWEST AND GREAT BASIN REGIONS. HOWEVER DO NOT EXPECT TO SEE A COMPLETE SHUT OFF OF THIS SUBTROPICAL MOISTURE UNTIL TUESDSAY OR WEDNESDAY. THEREFORE STRONG DAYTIME HEATING SHOULD CONTINUE TO BUBBLE UP THE LAST OF THIS MONSOONAL MOISTURE INTO SCATTERED AFTERNOON AND EVENING THUNDERSTORMS...MAINLY OVER AND NEAR THE MTNS EARLY NEXT WEEK. SHOULD ALSO SEE A GRADUAL RAISE IN TEMPERATURES NEXT WEEK...WITH 90 DEG READINGS RETURNING TO THE PLAINS BY WEDNESDAY OR THURSDAY WITH THE UPPER RIDGE BUILDING BACK OVER COLORADO. AVIATION...LITTLE CHANGE ANTICIPATED FOR 12Z ISSUANCES WITH BEST CHANCE FOR STORMS FROM MID AFTERNOON THROUGH THE EVENING HOURS AND THEN SOME LINGERING SHOWER ACTIVITY THROUGH THE NIGHT. AMOUNT OF TEMPO CONDITIONS MAY BE OVERDONE IN TERMS OF OVERALL THUNDERSTORM COVERAGE BUT HARD TO REALLY CUT THINGS DOWN TOO MUCH UNTIL THE REALITY OF HOW MUCH MOISTURE IS REALLY OUT THERE. SURFACE WINDS WILL GRADUALLY TREND TO THE NORTHEAST BUT NOT A REAL STRONG FRONTAL BOUNDARY EXPECTED THIS MORNING. HYDROLOGY...GIVEN SOME OF THE SUSPECT MOISTURE VALUES IN THE MODELS AM RELUCTANT ON ANY FLASH FLOOD WATCHES AT THIS TIME. STORMS WILL STILL BE MOVING AT 10-15KT BUT STORM TRAINING STILL A POSSIBILITY. BURN SCARS WILL CERTAINLY NEED TO BE WATCHED BUT OVERALL FLOODING THREAT WILL BE MORE LOCALIZED AND LIMITED TO THE BURN AREAS. CERTAINLY HEAVY RAIN CAN BE EXPECTED WITH THE STORMS AND RAINFALL RATES WILL BE OVER AN INCH IN 30 MINUTES WITH THE STRONGER STORMS. && .BOU WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...ENTREKIN LONG TERM....BAKER AVIATION...ENTREKIN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1031 AM MDT FRI JUL 06 2012 COZ030>051-071200- 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- 1031 AM MDT FRI JUL 06 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS WILL DEVELOP OVER THE MOUNTAINS AND FOOTHILLS BY LATER THIS MORNING AND GRADUALLY SPREAD OVER THE NORTHEAST PLAINS OF COLORADO THIS AFTERNOON AND EVENING. SOME OF THE STORMS WILL PRODUCE HEAVY RAINS WITH WIND TO 40 MPH. RAINFALL RATES COULD BE 1.50 INCHES ON 30 MINUTES WITH THE STRONGEST STORMS. MOISTURE LEVELS HAVE INCREASED TODAY WHILE TEMPERATURES WILL BE A SOMEWHAT COOLER. STORMS WILL BE MORE NUMEROUS OVER THE MOUNTAINS AND FOOTHILLS...WITH LESS ACTIVITY FURTHER EAST OVER THE FAR NORTHEAST PLAINS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY MOIST AND UNSETTLED CONDITIONS ALONG WITH BELOW AVERAGE TEMPERATURES ARE EXPECTED DURING THE UPCOMING WEEKEND. UPSLOPE FLOW EAST OF THE MOUNTAINS AND AN INFLUX OF SUBTROPICAL MOISTURE WILL INCREASE THE LIKELIHOOD OF PRECIPITATION FOR THE OUTLOOK AREA. RAINFALL FROM SLOW MOVING THUNDERSTORMS COULD BECOME HEAVY AT TIMES PARTICULARLY ALONG THE EAST FACE OF THE FRONT RANGE DURING THE AFTERNOON AND EVENING HOURS. RAINFALL RATES OVER AN INCH IN LESS THAN AN HOUR COULD CAUSE FLASH FLOODING PARTICULARLY IN AREAS RECENTLY BURNED OVER BY WILDFIRES. GRADUAL DRYING AND WARMING IS ANTICIPATED NEXT WEEK AS THE SUBTROPICAL MOISTURE IS EXPECTED TO SHIFT WEST AWAY FROM COLORADO. .SPOTTER INFORMATION STATEMENT... RAINFALL AND ANY FLOODING REPORTS WOULD BE VERY USEFUL TO THE STAFF AT THE NATIONAL WEATHER SERVICE IN BOULDER/DENVER. RJK/D_L
The Cheyenne radar (KCYS), 81 km away, was scanning. The volume nearest the first event began at 20:34 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain produced flash flooding in the High Park burn area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2012Every state in 2012This day in weather historyWarnings in Colorado, July 2012
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: 402463.