Localized flash flooding was reported yet again in southwest Colorado in the northwest San Juan mountains as thunderstorms with heavy rainfall continued to be a threat.
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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 GJT wrote it up.
Localized flash flooding was reported yet again in southwest Colorado in the northwest San Juan mountains as thunderstorms with heavy rainfall continued to be a threat.
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 Grand Junction, CO wrote its last area forecast discussion before the first event at Aug 28, 2:28 PM MST, 3 hours 54 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 328 PM MDT WED AUG 28 2013 .SHORT TERM...(TONIGHT THROUGH THURSDAY NIGHT) ISSUED AT 251 PM MDT WED AUG 28 2013 A BREAK IN ACTIVITY TODAY AS THE UPPER LEVEL RIDGE IS BUILDING BACK WEST. PWATS 12Z THIS MORNING WERE STILL AROUND 1 INCH THROUGHOUT EASTERN UT/WESTERN CO...BUT WITH DRYING AT THE LOWER AND UPPER LEVELS TODAY THE STORM ACTIVITY HAS REMAINED OVER HIGHER ELEVATIONS. EXPECTING THURSDAY TO BE SIMILAR TO TODAY ACTIVITY- WISE SINCE GROUND WILL BE DRIER SO THERE WILL BE MORE POTENTIAL THERMAL ENERGY FROM SURFACE HEATING...BUT SLIGHTLY LESS MOISTURE IN THE ATMOSPHERE. MODELS ARE INDICATING A GRADUAL DECREASE IN PWATS THE NEXT COUPLE OF DAYS...BUT STILL SUFFICIENT MOISTURE FOR SCATTERED SHOWERS. INVERTED TROUGH REMAINS OVER ARIZONA AND NEW MEXICO KEEPING THE BULK OF AVAILABLE MOISTURE TO THE SOUTH OF THE AREA. THE BEST MOISTURE THURSDAY SHOULD STAY NEAR AND TO THE SOUTH OF THE SAN JUANS DUE TO THIS FEATURE BEFORE IT DISSOLVES INTO THE UPPER LEVEL HIGH PRESSURE ON THURSDAY NIGHT. .LONG TERM...(FRIDAY THROUGH WEDNESDAY) ISSUED AT 251 PM MDT WED AUG 28 2013 FRIDAY THROUGH SUNDAY...MODELS HAVE SLOWED THE FORECAST EASTWARD PROGRESSION OF THE UPPER RIDGE OF HIGH PRESSURE LEAVING IT CENTERED NEARLY OVERHEAD FRIDAY THROUGH THE WEEKEND. THE EFFECT IS TO CUTOFF MUCH OF THE MONSOONAL MOISTURE PLUME WITH THE MAJORITY OF THE AREA RECYCLING MOISTURE FOR DAILY THUNDERSTORM ACTIVITY. ONE EXCEPTION IS ACROSS THE SOUTHERN THIRD OF THE CWA WHERE DEEPER MOISTURE FROM THE DESERT SOUTHWEST SEEPS NORTHWARD ALLOWING FOR PW VALUES JUST OVER 1.0 INCHES WITH THE REST OF THE AREA SEEING PW RANGING FROM 0.6-0.9 INCHES. IN THE WEAKLY SHEARED ENVIRONMENT...SCATTERED STORMS ARE EXPECTED TO BE DIURNALLY DRIVEN REMAINING PRIMARILY OVER THE TERRAIN IN THE WEAK FLOW WITH ONLY A FEW DRIFTING INTO THE LOWER VALLEYS...ALTHOUGH A WEAK SHEAR AXIS IN THE DEEPER MOISTURE ACROSS THE SOUTH MAY CAUSE LOWER ELEVATIONS THERE TO BE A BIT MORE ACTIVE. MONDAY THROUGH WEDNESDAY...THE AFOREMENTIONED UPPER HIGH IS NOW FORECAST TO NUDGE EASTWARD THE FIRST HALF OF NEXT WEEK. THIS ALLOWS DEEPER MOISTURE TO SPREAD NORTHWARD ACROSS THE CWA WITH VERY RESPECTABLE PW VALUES OF 1.0-1.2 INCHES. WEAK FORCING WILL ALSO BE AVAILABLE FROM THE REMAINS OF AN INVERTED TROUGH SHEARING APART...ALL THIS POINTS TO MORE WIDESPREAD SHOWER AND THUNDERSTORM ACTIVITY. LOCALLY HEAVY RAIN AND FLASH FLOODING MAY BECOME A CONCERN ONCE AGAIN. WITH ALL THIS IN MIND CONTINUED TO BUMP UP THE BLENDED POP GUIDANCE DURING THIS EXTENDED PERIOD. DAYTIME TEMPERATURES WILL REMAIN NEAR SEASONAL VALUES. && .AVIATION...(FOR THE 00Z TAFS THROUGH 00Z THURSDAY EVENING) ISSUED AT 251 PM MDT WED AUG 28 2013 VERY SLIGHT CHANCE TODAY OF TSTORMS REACHING TAF SITES...EXCEPT FOR KASE...BUT KEPT VC WX IN ALL TAFS DUE TO LOW PROBABILITY. ACTIVITY IS EXPECTED TO DISSIPATE QUICKLY AFTER SUNSET TONIGHT...BUT A FEW SHOWERS MAY CONTINUE NEAR NEAR KVEL AFTER SUNSET TONIGHT AS A WEAK DISTURBANCE PASSES BY THE AREA. MOUNTAIN OBSCURATIONS CAN BE EXPECTED IN VERY ISOLATED POCKETS OF MOUNTAIN AREAS. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...NONE. UT...NONE. && SHORT TERM...JAM LONG TERM...TB AVIATION...JAM
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
The Grand Junction radar (KGJX), 124 km away, was scanning. The volume nearest the first event began at 01:21 UTC.
1 flash flood. Local standard time, as filed.
Oak Creek and Canyon Creek experienced flash floods due to heavy runoff runoff from nearby mountains. Roads on the west side of Ouray were impassable due to the rising and fast moving water.
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, August 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: 533848.