Heavy runoff from thunderstorm rainfall caused a debris flow which closed a highway near Lake City.
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The episode as NWS GJT wrote it up.
Heavy runoff from thunderstorm rainfall caused a debris flow which closed a highway near Lake City.
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 5, 11:41 AM MST, 59 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 1241 PM MDT MON AUG 5 2013 .UPDATE... ISSUED AT 1126 AM MDT MON AUG 5 2013 CLOUD COVER ASSOCIATED WITH WEAK DISTURBANCE IS LIMITING CONVECTION OVER THE GRAND VALLEY AND UNCOMPAHGRE PLATEAU THUS FAR TODAY...BUT IS EXPECTED TO MOVE OUT OF THE REGION AFTER NOON AND WILL ALLOW CONVECTION TO POP UP ALONG VORT MAX PUSHING EAST FROM EAST-CENTRAL UTAH. ELSEWHERE...ISOLATED SHOWERS AND THUNDERSTORMS ARE BEGINNING TO DEVELOP AS SURFACE HEATING INCREASES. ENVIRONMENT IS FAVORABLE FOR SCATTERED SHOWERS ESPECIALLY OVER WEST-CENTRAL COLORADO AS MONSOONAL MOISTURE PLUME CONTINUES TO DELIVER PLENTY OF MOISTURE. && .SHORT TERM...(TODAY THROUGH TUESDAY) 300 AM MDT MON AUG 5 2013 RADAR MOSAIC SHOWING PLENTY OF ECHOES ACROSS THE CWA THIS MORNING AS WEAK PERTURBATIONS CONTINUE TO MOVE THROUGH THE MEAN FLOW. AS OPPOSED TO A FEW NIGHTS AGO...DISTURBANCES ARE WEAKENING AS THEY MOVE OVERHEAD CAUSING ONLY HEAVIER SHOWERS TO FORM AS OPPOSED TO THUNDERSTORMS. A FEW MORE WEAK DISTURBANCES LOOK TO ENTER SRN UT/CO SHORTLY THOUGH THEY TOO ARE WEAKENING AS THEY CONTINUE TO TREK NORTH. IN ANY CASE...WILL KEEP ISOLD POPS IN FORECAST THROUGH 12Z. FORECAST PWATS VARY BETWEEN .7 INCHES TO ALMOST 1 INCH SO NO MAJOR DOWNTURN IN MOISTURE EXPECTED. TODAY WILL BE VERY SIMILAR TO SUNDAY AS THE LOCATION OF HIGH PRESSURE TO THE EAST AND TROUGH TO THE WEST KEEPS THE MOISTURE PLUME INTACT. DISTURBANCES WILL CONTINUE TO RIDE UP AND AROUND THE AREA OF HIGH PRESSURE CAUSING PLENTY OF SHOWERS AND STORMS TO FORM TODAY WITH COVERAGE A BIT BETTER THAN YESTERDAY. LIKE SUNDAY...STORMS WILL FORM OVER HIGHER TERRAIN BEFORE DRIFTING INTO ADJACENT VALLEYS. MOISTURE PLUME REMAINS ACROSS THE FORECAST AREA TONIGHT AND TUESDAY AS THE CLOCKWISE FLOW AROUND THE UPPER HIGH OVER TEXAS CONTINUES DIRECTING MOISTURE NORTHWARD. MODELS CONTINUE TO SHOW DECREASED PRECIPITABLE WATER FOR TUESDAY...BUT WITH NOT MUCH CHANGE IN THE OVERALL PATTERN DO NOT EXPECT MUCH CHANGE FROM THE DIURNAL PRECIPITATION PATTERN EXPERIENCED THE PAST FEW DAYS. THUS...WILL LEAN TOWARD PERSISTENCE FOR TONIGHT AND TUESDAY. .LONG TERM...(TUESDAY NIGHT THROUGH SUNDAY NIGHT) 300 AM MDT MON AUG 5 2013 A CLOSED LOW IS EXPECTED TO REMAIN OFF THE CA COAST THROUGH MIDWEEK WITH THE UPPER HIGH STILL OVER THE SOUTHERN PLAINS. BOTH 00Z NAM AND GFS SHOW A SHORTWAVE TROUGH MOVING IN FROM THE SOUTHWEST ON WED WHICH SHOULD KEEP SHOWERS AND THUNDERSTORMS AROUND. TIMING HAS BE SOMEWHAT VARIABLE...BUT MODELS HAVE BEEN CONSISTENT WITH THIS FEATURE. QUESTION MAY BE WHETHER THE CONCURRENT INCREASE IN CLOUDS WED MORNING WORKS TO LIMIT THE AMOUNT OF CONVECTION AND STORM STRENGTH. CURRENT FORECAST SHOWS COOLER TEMPS DUE TO THE CLOUDS ON WED AND THAT STILL LOOKS REASONABLE. HIGH PRESSURE GETS FLATTENED CONSIDERABLY THURSDAY AND BEYOND AS A SUBTROPICAL JET APPROACHES FROM THE DESERT SW AND LAYS ACROSS AZ...NRN NM...SRN CO INTO THE PLAINS. EVEN WITH THIS SYNOPTIC SCALE CHANGE...THE GFS AND EC CONTINUE TO SHOW AFTERNOON CONVECTION THOUGH THE MONSOONAL MOISTURE DROPS OFF CONSIDERABLY. THURSDAY LOOKS TO BE THE DRIEST DAY WITH MINIMAL CONVECTION BEFORE PICKING UP AGAIN FRIDAY AND CONTINUING INTO THE WEEKEND. && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z TUESDAY AFTERNOON) ISSUED AT 1238 PM MDT MON AUG 5 2013 CONVECTION HAS KICKED OFF WITH WIDELY SCATTERED STORMS AND SHOWERS. MEDIUM CONFIDENCE THAT AIRFIELDS MAY SEE SOME ACTIVITY SO KEPT VCTS IN ALL TAFS. AT THIS TIME...NO AIRPORTS LOOK TO BE DIRECTLY AFFECTED BUT WILL CONTINUE TO MONITOR. EXPECT GUSTY WINDS UP TO 40 MPH...SMALL HAIL AND BRIEF HEAVY RAIN TO ACCOMPANY THE STRONGER STORMS. MOUNTAIN OBSCURATIONS WILL BE COMMON AS WILL BRIEF MVFR CIGS/VIS AS STORMS PASS THROUGH. MOST CONVECTION SHOULD BE OVER BY 03Z THOUGH SOME STRAY SHOWERS AND STORMS MAY PERSIST THROUGH 06Z. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...NONE. UT...NONE. && UPDATE...JAM SHORT TERM...TGR/JAD LONG TERM...JAD/TGR AVIATION...TGJT
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
The national radar mosaic for the moment the first event began.
1 debris flow. Local standard time, as filed.
A debris flow caused by heavy rainfall closed Highway 149 between mile markers 77 and 79 for several hours.
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: 533628.