Snowmelt from a much above normal snowpack combined with little reservoir storage (nearly full reservoirs) to cause minor to moderate flooding of lowlands in the Mason Valley from mid June through mid July.
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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 REV wrote it up.
Snowmelt from a much above normal snowpack combined with little reservoir storage (nearly full reservoirs) to cause minor to moderate flooding of lowlands in the Mason Valley from mid June through mid July.
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 Reno, NV wrote its last area forecast discussion before the first event at Jun 12, 1:45 PM PST, 2 hours 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RENO NV 245 PM PDT SUN JUN 12 2011 .SHORT TERM... WEAK HIGH PRESSURE REMAINS OVER THE AREA WITH A SHORTWAVE AND ASSOCIATED JET STREAK TO MOVE OVER THE FAR NORTHERN PORTION OF THE FORECAST AREA OVERNIGHT. FAR NRN WASHOE VALLEY AND THE SURPRISE VALLEY WILL BRIEFLY BE IN THE LEFT EXIT REGION OF THE UPPER JET STEAK WITH ANY SHOWER DEVELOPMENT EXPECTED TO BE FROM THE OREGON BORDER NORTH. SOME HIGH AND MID CLOUDS FROM THIS FEATURE WILL MOVE THROUGH MUCH OF THE FORECAST AREA OVERNIGHT BEFORE CLEARING EARLY MONDAY MORNING. THE RIDGE IS EXPECTED TO STRENGTHEN INTO THE WEST COAST OVER THE NEXT 48 HOURS PROVIDING A NICE WARMING TREND WITH TEMPS EXPECTING TO REACH NEAR 90 IN MANY WESTERN NV AND EASTERN CA VALLEYS BY TUESDAY. THIS WILL BRING THE WARMEST TEMPS OF THE YEAR AND CONTRIBUTE TO HIGH ELEVATION SNOWMELT AND HYDROLOGIC CONCERNS...WHICH ARE DETAILED IN THEY HYDROLOGY SECTION BELOW. OTHER THAN SOME RELATIVELY LIGHT LATE AFTERNOON AND EARLY EVENING WESTERLIES...THE SHORT TERM FORECAST IS EXCEPTIONALLY QUIET WITH MOSTLY CLEAR SKIES AND TEMPS GETTING 5-10 DEGREES ABOVE NORMAL BY TUESDAY. A NEW TROUGH IS EXPECTED TO DROP TOWARD THE PAC NW WEDNESDAY AND MAY LOWER HEIGHTS SLIGHTLY WEDNESDAY FOR THE POTENTIAL FOR A FEW DEGREES OF COOLING. MILNE .LONG TERM...THURSDAY THROUGH SUNDAY... LONG RANGE MODELS ARE IN DECENT AGREEMENT THURSDAY AND FRIDAY BUT DIFFERENCES ARE STILL CROPPING UP GOING INTO THE WEEKEND MAINLY FOCUSED ON HOW SHORTWAVE ENERGY FROM BRITISH COLUMBIA WILL DIG SOUTH. BROADSCALE CYCLONIC FLOW WILL COOL TEMPERATURES BACK NEAR NORMAL THURSDAY AND FRIDAY. AN INCREASE IN MID AND HIGH LEVEL MOISTURE WILL BRING CLOUDS TO THE REGION FRIDAY...THOUGH PRECIPITATION IS NOT LIKELY. FOR THE WEEKEND...THE GFS BRUSHES THE SHORTWAVE ENERGY PAST THE CWA...BUT DOES NOT DIG THE COLDER AIR VERY FAR SOUTH. THE EC TAKES THE ENERGY FURTHER SOUTH AND WOULD BE 10-15 DEGREES COOLER THAN WHAT THE GFS IS SUGGESTING. MODELS HAVE HAD A HARD TIME TRYING TO RESOLVE THIS FEATURE OVER THE PAST COUPLE OF DAYS WITH LOTS OF CHANGES IN THEIR SOLUTIONS SO CONFIDENCE REMAINS LOW. ENSEMBLES ALL SHOW THE LONGWAVE TROUGH OVER THE REGION...BUT HAVE A GREAT DEAL OF VARIANCE FOR THE 500 HEIGHT AMONGST MEMBERS...SO IT DOES NOT OFFER ANY ADDITIONAL GUIDANCE. FOR NOW HAVE LEFT TEMPERATURES WITHIN A COUPLE DEGREE OF NORMAL. AN INLAND TROUGH AND NORTHWEST FLOW DOES NOT SUPPORT CONVECTION...THOUGH THE COOLER EC DOES INDICATE SOME LIGHT QPF ACROSS CENTRAL NEVADA NORTH AND EASTWARD FOR THE WEEKEND. FOR NOW HAVE KEPT THE WEATHER DRY. DF && .AVIATION... THERE IS ONLY A 10-20 PERCENT CHANCE FOR FOG AT KTRK BTWN 10Z-14Z... SO DECIDED TO LEAVE IT OUT OF THE TAF. OTHERWISE VFR WITH LIGHT WINDS TODAY WITH INCREASING HIGH LEVEL CLOUDS AND AFTERNOON WIND GUSTS UP TO 20 MPH ON MONDAY. DF && .HYDROLOGY... THE CURRENT MILD CONDITIONS ARE ALLOWING THE HIGH ELEVATION SNOWPACK TO RAPIDLY MELT OFF. THIS HAS LED TO SIGNIFICANT RISES ON ALL RIVERS...CREEKS AND STREAMS COMING OUT OF THE HIGH SIERRA. WITH TEMPS WARMING EARLY THIS WEEK...RUNOFF WILL INCREASE AND BRING FURTHER RISES TO NEAR OR ABOVE FLOOD STAGE ON PORTIONS OF THE WALKER AND CARSON RIVERS. THERE ARE NO CONCERNS WITH THE TRUCKEE DUE TO AMPLE RESERVOIR STORAGE. THE WEST WALKER RIVER IS EXPECTED TO GET ABOVE FLOOD STAGE AROUND TUESDAY. THE MAIN STEM WALKER IS EXPECTED TO GET TO FLOOD STAGE BY EARLY MONDAY MORNING FROM MASON TO WEBER DAM WITH ONLY MINOR LOWLAND FLOODING EXPECTED INITIALLY. FURTHER RISES ON THE WALKER ARE EXPECTED AS THE WEEK PROGRESSES. FOR THE CARSON RIVER...MINOR FLOODING IS POSSIBLE ON THE WEST FORK AT SOME POINT THIS WEEK...BUT ENOUGH SNOWPACK HAS ALREADY MELTED THIS SEASON THAT IMPACTS ARE EXPECTED TO BE MINOR. RISES ON RIVERS WILL NEED TO BE CLOSELY MONITORED THIS WEEK. ADDITIONAL DETAILS ON FLOOD WATCHES AND WARNINGS CAN BE FOUND IN THE HYDROLOGY PRODUCTS ISSUED BY NWS RENO AT WWW.WEATHER.GOV/RENO. MILNE/HOHMANN && .REV WATCHES/WARNINGS/ADVISORIES... NV...NONE. CA...NONE. && HTTP://WEATHER.GOV/RENO
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Heavy snowmelt caused minor to moderate lowland flooding late in June and into early July in the Mason Valley south of Yerington with some backyards and crop fields flooded.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2011Every state in 2011This day in weather historyWarnings in Nevada, June 2011
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: 318270.