A levee breach along the South Platte River inundated farmland across northeast Morgan and northwest Washington Counties. The breach also washed out a Union Pacific railroad tracks with forced the closure of the railroad for several days until repair could be completed.
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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.
A levee breach along the South Platte River inundated farmland across northeast Morgan and northwest Washington Counties. The breach also washed out a Union Pacific railroad tracks with forced the closure of the railroad for several days until repair could be completed.
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 15, 2:50 AM MST, 3 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER/BOULDER CO 350 AM MDT MON JUN 15 2015 .SHORT TERM...(TODAY THROUGH TONIGHT ) ISSUED AT 345 AM MDT MON JUN 15 2015 THE WEAK COLD FRONT FROM LAST EVENING CAME THROUGH RATHER WIMPY AS SURFACE WINDS HAVE BECOME VARIABLE UNDER 10KT OVERNIGHT. PER VAD WINDS...THERE IS SOME SHALLOW UPSLOPE FLOW FROM THE NORTHEAST JUST OFF THE DECK AND IS HELPING TO DEVELOP SOME HIGH STRATUS NEAR THE FOOTHILLS IN THE 4 TO 5 THOUSAND FOOT LEVEL AGL. THERE WAS A FEW LIGHT RAIN SHOWERS OVER THE MOUNTAINS BUT HAVE DISSIPATED TRYING TO COME OFF THE HILLS. OTHER AREA OF STRATUS ALSO DEVELOPING OVER THE FAR EASTERN PLAINS WITH SOME PROGRESSION TOWARDS THE WEST. SURFACE DEWPOINTS HAVE COME UP FOLLOWING LAST EVENINGS SURGES WITH DEWPOINTS NOW IN THE LOWER TO MID 50S ACROSS ALL OF THE PLAINS. INTEGRATED PW VALUES HAVE ALSO INCREASED TO NOW JUST OVER .80". WILL NEED TO MAKE SOME ADJUSTMENTS TO SKY COVER THIS AM GIVEN LATEST TRENDS FROM SATELLITE IMAGERY. INCREASED MOISTURE VALUES WILL LEAD TO HIGHER CHANCES OF SHOWERS AND STORMS THIS AFTERNOON AS PW VALUES INCREASE TO AROUND AN INCH OVER THE FRONT RANGE. INITIAL LOW LEVEL INVERSIONS WILL DISSOLVE BY MID AFTERNOON AND RESULTANT CAPE VALUES ANYWHERE FROM 1000-2000J/KG OVER FRONT RANGE AND PLAINS. SHEAR PROFILE IS MARGINAL BUT WITH HIGH CAPES THERE IS A SEVERE THREAT FOR HAIL UP TO ONE INCH IN DIAMETER ALONG WITH VERY HEAVY RAIN WITH STORMS. THE FLOW ALOFT WILL REMAIN FAIRLY LIGHTLY OUT OF THE WEST WHILE WATER VAPOR IMAGERY SHOWING A FEW POSSIBLE RIPPLES IN THE FLOW ACROSS UTAH AND NEVADA. WITH ONLY WEAK QG ASCENT WON'T EXPECT STORMS TO LAST MUCH PAST MIDNIGHT TONIGHT. .LONG TERM...(TUESDAY THROUGH SUNDAY) ISSUED AT 345 AM MDT MON JUN 15 2015 INCREASINGLY DRY UPPER LEVEL ZONAL FLOW WILL DOMINATE TUESDAY OVER NE COLORADO. LINGERING MOISTURE WILL ALLOW MORE TERRAIN DRIVEN CONVECTION OVER THE MOUNTAINS BUT CAN'T RULE OUT SOME DEVELOPMENT ALONG A LINE NORTH OF THE PALMER DIVIDE SW OF DENVER WITH THE HELP OF A POSSIBLE DENVER CYCLONE SET UP. NAM IS HINTING MORE AT IT WITH THE 00Z. INSTABILITY IS MARGINAL BUT WE SHOULD WARM UP INTO THE UPPER 80S. EVEN WITH THE LACK OF DECENT SHEAR THE CYCLONE COULD HELP TO SPIN OFF A FEW STORMS THAT COULD RESULT IN BRIEF HEAVY RAIN...WINDS AND HAIL. TUESDAY NIGHT INTO WEDNESDAY UNIFORM WESTERLY FLOW MOVES IN WITH A SURFACE COLD FRONT EARLY WEDNESDAY. BOTH EC AND GFS SHOW POTENTIAL FOR HEAVY RAIN AND HIGH WINDS INTO WEDNESDAY AFTERNOON. INSTABILITY IS MARGINAL BUT WITH DECENT SHEAR CONDITIONS COULD PRODUCE STRONG STORMS BY WEDNESDAY EVE. BY THURSDAY AFTERNOON AND INTO THE WEEKEND WESTERLY FLOW ALOFT CONTINUES WITH DRIER AIR MOVING IN USHERING IN MORE SUMMER LIKE CONDITIONS. MOISTURE DECREASES GREATLY OVER THE REGION WITH TEMPERATURES REACHING INTO THE LOWER TO MID 90S BY THURSDAY AND FRIDAY. WEAK UPPER LEVEL RIDGING WILL START TO BREAKDOWN BY FRIDAY EVENING INCREASING CHANCES FOR SOME DEVELOPMENT SATURDAY AFTERNOON DROPPING TEMPERATURES CLOSER TO SEASONAL NORMALS BY SUNDAY. && .AVIATION...(FOR THE TAFS THROUGH 12Z TUESDAY MORNING) ISSUED AT 345 AM MDT MON JUN 15 2015 TRICKY CLOUD FORECAST THIS AM WITH SOME HIGHER STRATUS ALONG BASE OF FOOTHILLS AND ANOTHER BATCH OF STRATUS MOVING WEST FROM THE FAR PLAINS. TIMING WOULD BRING SOME OF THIS INTO APA/DEN BETWEEN 11-12Z BUT UNSURE HOW LOW CIGS MAY GET. MAY NEED TO GO LOWER AGAIN BASED ON CIGS OVER THE EASTERN PLAINS BUT WILL REEVALUATE CLOSER TO 12Z TAF ISSUANCE. EXPECT HIGHER CHANCES OF STORMS TODAY GIVEN INCREASE IN LOW LEVEL MOISTURE AND INSTABILITY. LOW LEVEL INVERSIONS WILL DISSOLVE AROUND 21Z RESULTING IN A WINDOW OF STORMS BETWEEN 21-02Z OVER TERMINALS. COULD SEE ILS APPROACHES WITH PASSING STORMS TODAY. && .HYDROLOGY... ISSUED AT 345 AM MDT MON JUN 15 2015 BETTER CHANCE FOR STORMS TODAY OVER THE FRONT RANGE WITH INCREASING LOW LEVEL MOISTURE. PW VALUES INCREASE TO AROUND AN INCH THIS AFTERNOON SO HEAVY RAIN EXPECTED WITH STORMS. COULD SEE INCREASE OF STREAM/RIVER LEVELS IN PROXIMITY TO STRONG STORMS THIS AFTERNOON AND EVENING. WOULD EXPECT FOCUS OF STORMS WITH HEAVIEST RAIN IN THE FOOTHILLS...PALMER DIVIDE AND PARK COUNTY GIVEN EAST TO SOUTHEAST LOW LEVEL FLOW THIS AFTERNOON. NO CHANGES TO CURRENT FLOOD WARNINGS ALONG THE S PLATTE...CACHE LA POUDRE RIVERS BUT THE WARNING ALONG S PLATTE IN JEFFERSON COUNTY LOOKS TO GO BELOW FLOOD WARNING STAGE SOMETIME EARLY THIS MORNING. && .BOU WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...ENTREKIN LONG TERM...BOWEN AVIATION...ENTREKIN HYDROLOGY...BOWEN/ENTREKIN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER/BOULDER CO 449 AM MDT MON JUN 15 2015 COZ030>051-161100- 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- 449 AM MDT MON JUN 15 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP BY NOON ACROSS THE MOUNTAINS AND THEN SPREAD OVER THE PLAINS THROUGH THE REST OF THE AFTERNOON AND EVENING. EXPECT HEAVY RAIN...HAIL UP TO ONE INCH IN DIAMETER AND GUSTY WINDS WITH THE STRONGER STORMS. RAINFALL RATES COULD APPROACH ONE INCH IN 30 MINUTES OR LESS. MOISTURE LEVELS HAVE INCREASED ACROSS LOWER ELEVATIONS TODAY...FOLLOWING A WEAK FRONTAL SURGE LAST NIGHT. THIS WILL RESULT IN HIGHER INSTABILITY IN THE ATMOSPHERE. THE FOCUS FOR THE STRONGER STORMS WILL BE OVER THE FOOTHILLS...PALMER DIVIDE AND PARK COUNTY THIS AFTERNOON AND EARLY EVENING. THE STORMS WILL DIMINISH LATER THIS EVENING AND OVERNIGHT OVER THE PLAINS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ISOLATED TO SCATTERED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE TUESDAY AND WEDNESDAY DECREASING BY THURSDAY WITH TEMPERATURES CLIMBING ABOVE SEASONAL NORMALS TOWARDS THE END OF THE WORK WEEK. TUESDAY WILL BE THE COOLEST DAY OF THE WEEK WITH A SLIGHT CHANCE OF THUNDERSTORMS BY THE AFTERNOON. SOME OF THESE STORMS COULD PRODUCE HEAVY RAIN...HAIL AND GUSTY WINDS. MOIST SOIL CONDITIONS AND WARMER TEMPERATURES ACROSS NORTHERN COLORADO NEXT WEEK WILL CAUSE CREEKS AND RIVERS TO CONTINUE RUNNING HIGHER THAN NORMAL DUE TO SHOWERS AND INCREASED SNOW MELT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED ACROSS THE NORTHEAST PLAINS OF COLORADO AFTER 1 PM.
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
A levee breach along the South Platte River produced farmland flooding over northeast Morgan County. Morgan County Road 7 was also washed out.
A levee breach, about 100 yards wide along the South Platte River, produced farmland flooding over northwest Washington County. Floodwaters, 3 to 4 feet deep, washed out the Union Pacific railroad tracks southwest of Messex. Up to 10 inches of water covered several miles of track. Approximately 30 trains per day had to be diverted until the tracks could be repaired and inspected. Washington County Road 58.3 was also washed out.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2015Every state in 2015This day in weather historyWarnings in Colorado, June 2015
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: 591952, 591957.