Heavy rain produced flash flooding in the High Park burn area. Debris from the floodwaters forced the closure of Stove Prairie Road, north of town.
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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. Debris from the floodwaters forced the closure of Stove Prairie Road, north of town. In addition, flooding was also observed along CO14 at Mile Marker 105.
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 Sep 6, 8:58 AM MST, 4 hours 2 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER/BOULDER CO 958 AM MDT FRI SEP 6 2013 .UPDATE...MAIN STORY IN THE MISERABLE HEAT AND THE CURRENT GRIDS HAVE THINGS PRETTY WELL IN HAND IN THAT REGARD. MANY PLAINS LOCALES' TEMPERATURES ARE RUNNING 5-10 DEGREES AHEAD OF YESTERDAY AT THIS TIME SO HIGHS OF 95-100 ACROSS THE LOWER ELEVATIONS SEEM REASONABLE. IF WE HIT THE 98 AT DENVER THAT WE CURRENTLY HAVE IN THE FORECAST THAT WOULD MAKE IT THE HOTTEST TEMPERATURE EVER RECORDED IN SEPTEMBER AND THIS LATE IN THE SUMMER SINCE RECORDS BEGAN IN 1872. FURTHERMORE...IF BY CHANCE WE HIT THE CENTURY MARK TODAY...NOT ONLY WOULD THE AFOREMENTIONED RECORD BE SET BUT IT WOULD ALSO GIVE 2013 THE DISTINCTION OF HAVING BOTH THE EARLIEST (JUNE 11) AND LATEST 100 DEGREE READINGS IN DENVER. WE SHALL SEE. STILL PLANNING ON SOME HIGH COUNTRY CONVECTION THIS AFTERNOON AND EVENING...SOME OF WHICH MAY BLEED INTO THE URBAN CORRIDOR MID TO LATE AFTERNOON. IT WILL TOUGH FOR THE ACTIVITY TO SURVIVE FURTHER EAST. HIGH TEMPERATURE AT DIA AS OF 0953 MDT...82 DEGREES && .AVIATION...STILL LOOKS LIKE MOST CONVECTIVE ACTIVITY WILL STAY OVER THE HIGHER TERRAIN THIS AFTERNOON AND EVENING IMPLYING THAT KBJC WOULD HAVE THE BEST CHANCE OF SEEING VCTS. CANNOT COMPLETELY RULE OUT THE POSSIBLITY AT THE OTHER TWO SITES BUT PROBABILITY IS LOWER. NOT PLANNING ON MAKING ANY OTHER BIG CHANGES IN THE 18Z TAFS FROM WHAT IS ALREADY THERE. && .PREV DISCUSSION... /ISSUED 354 AM MDT FRI SEP 6 2013/ SHORT TERM...ANOTHER RECORD BREAKING DAY OF HEAT IS IN STORE FOR THE FORECAST AREA. THE UPPER LEVEL RIDGE HAS MOVED VERY LITTLE IN THE LAST 24 HOURS...WHILE AT THE SAME TIME SLIGHTLY DRIER AIR WILL CONTINUE TO ADVECT NORTHWARD ACROSS THE PLAINS. THIS WILL ALLOW FOR MORE SUNSHINE...BOOSTING TEMPS TO AT LEAST HIGHS OBSERVED YESTERDAY AND LIKELY EXCEEDING THOSE BY A DEGREE OR TWO. THIS WOULD RESULT IN DENVER POSSIBLY BREAKING THE ALL TIME SEPTEMBER HIGH TEMPERATURE OF 97F WHICH WAS TIED YESTERDAY. A COUPLE SPOTS ON THE EASTERN PLAINS SHOULD REACH 100F. MEANWHILE...WITH SOMEWHAT DRIER AIR WE WILL BE HARD PRESSED TO SEE ANY CONVECTION EAST OF THE FOOTHILLS. AT BEST WE WILL SEE A HIGH BASED STORM WITH GUSTY MICROBURST WINDS AND ONLY LIGHT RAIN/SPRINKLES DUE TO DEEPER AND DRIER SUB CLOUD LAYER. IN THE MOUNTAINS...BETTER MOISTURE HANGS ON TODAY SO EXPECT ANOTHER ROUND OF SCATTERED THUNDERSTORMS FROM THE NOON HOUR THROUGH EARLY EVENING...AND THEN COMING TO AN END BEFORE MIDNIGHT. LONG TERM...UNSEASONABLY WARM TEMPERATURES WILL CONTINUE THROUGH THE WEEKEND AS THE UPPER RIDGE AXIS REMAINS OVER WESTERN KANSAS AND THE DOME OF WARM TEMPERATURES ALOFT STAYS OVER COLORADO. SMALL AMOUNTS OF SUBTROPICAL MOISTURE WILL CONTINUE FUELING AFTERNOON SHOWERS OVER THE MOUNTAINS EACH AFTERNOON. CHANCES OF PRECIPITATION WILL BE LOWER ACROSS THE PLAINS. EARLY NEXT WEEK WILL SEE A CHANGE TO COOLER AND A BIT MORE UNSETTLED WEATHER AS BOTH THE GFS AND ECMWF SHOW THE UPPER RIDGE MIGRATING EASTWARD FOR A COUPLE DAYS. THIS WILL ALLOW THE FLOW OF SUBTROPICAL MOISTURE TO INCREASE FROM THE SOUTH WHILE AN UPPER TROUGH MOVES FROM THE NORTHERN ROCKIES OUT OVER THE NORTHERN GREAT PLAINS. THERE WILL ALSO BE A WEAK UPPER JET MOVING OVER WYOMING AND NEBRASKA WITH NORTHERN COLORADO UNDER THE RIGHT ENTRANCE REGION OF THE JET FOR A WHILE. THE SOUTHERN PART OF THE UPPER TROUGH INTERACTING WITH MID-LEVEL MOISTURE MOVING UP FROM THE SOUTH MAY GET TOGETHER AND INCREASE THE SHOWER COVERAGE ACROSS THE FORECAST AREA ON MONDAY AND TUESDAY. A WEAK SURFACE COLD FRONT ASSOCIATED WITH THE UPPER TROUGH WILL DROP TEMPERATURES BACK TO NEAR NORMAL THROUGH THE MIDDLE OF THE WEEK. THE FORECAST SITUATION ON MONDAY AND TUESDAY WILL WARRANT THE MOST WATCHING OVER THE NEXT FEW DAYS. LATER NEXT WEEK...THE UPPER RIDGE IS EXPECTED TO RETROGRADE AGAIN AND EXERT MORE INFLUENCE ON COLORADO WEATHER BEYOND NEXT WEDNESDAY. AVIATION...WE WILL BE DRIER SO THREAT OF ANY STORMS IS TOO LOW TO MENTION IN THE TAFS AT THIS TIME. HOWEVER...THERE IS STILL A RISK OF MICROBURST ACTIVITY WITH 40 PLUS KNOT WIND GUSTS FROM 22Z-02Z WITH ANY HIGH BASED CONVECTIVE DEVELOPMENT. OTHERWISE VISUAL LANDING CONDITIONS WILL PREVAIL WITH NORMAL DIURNAL WIND PATTERNS UNDER 12 KTS. HYDROLOGY...ONLY ISOLATED COVERAGE OF STRONGER STORMS IN THE MOUNTAINS WILL MEAN A VERY LOW RISK OF ANY FLOODING IN THE FRONT RANGE BURN SCARS. THE STRONGEST STORMS MAINLY IN THE MOUNTAINS AND HIGHER FOOTHILLS ABOVE THE BURN SCARS WILL BE CAPABLE OF PRODUCING 0.50 TO 1.0 INCH OF RAIN IN 40 MINUTES. OTHERWISE NO CONCERNS. && .BOU WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...BARJENBRUCH LONG TERM....DANKERS UPDATE/AVIATION...ET
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1114 AM MDT FRI SEP 6 2013 COZ030>051-071715- 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- 1114 AM MDT FRI SEP 6 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT RECORD HIGH TEMPERATURES ARE LIKELY TODAY AS A LARGE UPPER LEVEL RIDGE REMAINS CENTERED OVER EASTERN COLORADO. TEMPERATURES AT MOST PLAINS LOCATIONS WILL SOAR INTO THE 95 TO 100 DEGREE RANGE WHILE UNSEASONABLY WARM 70S AND 80S CAN BE EXPECTED IN THE HIGH COUNTRY. SCATTERED THUNDERSTORMS WILL DEVELOP OVER THE MOUNTAINS AND HIGHER FOOTHILLS BY AFTERNOON. THERE IS JUST A SLIGHT CHANCE OF A STORM WITH GUSTY WINDS BUT LITTLE RAIN ON THE NEARBY ADJACENT PLAINS LATE THIS AFTERNOON OR EVENING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY HIGH PRESSURE WILL PERSIST OVER THE REGION THROUGH THE WEEKEND WITH NEAR RECORD WARM TEMPERATURES CONTINUING SATURDAY AND SUNDAY. AFTERNOON THUNDERSTORMS ARE EXPECTED OVER THE MOUNTAINS EACH DAY. BRIEF HEAVY RAIN WILL BE POSSIBLE WITH SOME OF THE STORMS...BUT THE COVERAGE SHOULD BE LIMITED. THE UPPER LEVEL HIGH WILL MOVE EASTWARD AND AWAY FROM COLORADO EARLY NEXT WEEK WHICH WILL ALLOW TEMPERATURES TO RETURN TO NEAR NORMAL STARTING ON TUESDAY. CHANCES FOR SHOWERS WILL CONTINUE OVER THE MOUNTAINS...BUT WILL ALSO SPREAD ONTO THE PLAINS MONDAY AND TUESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT. GIMMESTAD/ET
The Cheyenne radar (KCYS), 73 km away, was scanning. The volume nearest the first event began at 20:00 UTC.
1 flash flood. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2013Every state in 2013This day in weather historyWarnings in Colorado, September 2013
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: 473869.