Multiple thunderstorms formed and trained over the Pine Grove Hills range south of Yerington on the afternoon of the 7th. This caused flash flooding over portions of East Walker and Pine Grove Roads near the Flying M Ranch.
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The episode as NWS REV wrote it up.
Multiple thunderstorms formed and trained over the Pine Grove Hills range south of Yerington on the afternoon of the 7th. This caused flash flooding over portions of East Walker and Pine Grove Roads near the Flying M Ranch.
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 Jul 7, 1:56 PM PST, 1 hour 34 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RENO NV 256 PM PDT THU JUL 7 2011 .SHORT TERM... ONLY MINOR TWEAKS TO THE SHORT TERM GRIDS. THE MOST SIGNIFICANT CHANGE WAS TO LIMIT THE SLIGHT CHANCE OF THUNDERSTORMS SATURDAY AND SUNDAY IN MONO COUNTY TO EAST OF HIGHWAY 395. PER THE WATER VAPOR SATELLITE AND AMSU/SSMI IMAGERY...DRIER AIR HAS BEGUN ITS ASSAULT ON MUCH OF THE CWA. AT THE SURFACE...THIS CAN BE SEEN WITH DEWPOINTS FALLING INTO THE MID 30S TO MID 40S FOR THE WESTERN AND NORTHWESTERN CWA WHILE DEWPOINTS FURTHER SOUTH AND EAST (NEAR INTERSTATE 80 EAST OF FERNLEY AND SOUTH TO MONO AND MINERAL COUNTIES) REMAIN IN THE MID 40S TO AROUND 50. IN GENERAL... STRONGER STORMS OVER THE EASTERN AND SOUTHERN CWA THIS AFTERNOON AND EARLY EVENING COULD PRODUCE HALF INCH HAIL AND AROUND 40 MPH OUTFLOW WINDS ALONG WITH BRIEF HEAVY RAIN (ESPECIALLY OVER MINERAL AND SOUTHERN LYON COUNTIES). FURTHER NORTH AND WEST...WITH THE DRIER AIR WORKING INTO THE CWA CUMULUS HAVE REMAINED VERTICALLY CHALLENGED AS INSTABILITY SHRINKS AND WINDS ALOFT TEAR UP THE WEAK DEVELOPMENT. FOR FRIDAY AND SATURDAY AFTERNOON...THE MAIN FOCUS WILL BE WHETHER WE CAN EEK OUT ISOLATED AFTERNOON THUNDERSTORMS OVER THE SOUTHERN CWA AND IN THE LASSEN PEAK CONVERGENCE ZONE OVER NORTHERN LASSEN AND WASHOE COUNTIES. ONE THING IS FOR SURE THOUGH...MOISTURE WILL BE MUCH LOWER THAN WE HAVE SEEN OF LATE WITH DRIER SOUTHWEST FLOW ALOFT SO STORMS WILL HAVE MUCH LESS PRECIP PRODUCING POTENTIAL. FOR MONO AND MINERAL COUNTIES...LIGHTER FLOW AND WARMER TEMPS WILL MAKE FOR A BETTER SHOT AT A FEW STORMS THAN ACROSS THE NORTHERN CWA...ESPECIALLY FRIDAY. ON SATURDAY...ENOUGH WEST FLOW IS PROGGED THAT I DECIDED TO KICK THE SLIGHT CHANCE FOR STORMS OFF THE CREST WHERE AFTERNOON CONVERGENCE IS MAXIMIZED. FOR THE NORTHERN CWA...IT IS MUCH MORE MARGINAL BUT HARD TO COMPLETELY RULE OUT AN AFTERNOON STORM OR TWO FRIDAY AND SATURDAY AS SOME LOW LEVEL CONVERGENCE JUST SOUTH OF A WEAK FRONTAL BOUNDARY OVER EXTREME NORTHERN CALIFORNIA AND NEVADA PROVIDES FOCUS FOR SOME AFTERNOON CUMULUS DEVELOPMENT. ON SUNDAY...IT IS FINALLY PROGGED TO DRY ENOUGH TO REMOVE THE SLIGHT CHANCE OF THUNDERSTORMS FROM THE NORTHERN CWA. SNYDER .LONG TERM...MONDAY THROUGH THURSDAY... LONGWAVE PATTERN WITH TROF NEAR WRN US AND RIDGE OVER THE ERN TWO THIRDS OF THE US WILL BRING DRY SOUTHWEST FLOW ALOFT AND GENERALLY QUIET WEATHER NEXT WEEK WITH TEMPS SEVERAL DEGREES COOLER COMPARED TO RECENT DAYS. FOR MON-TUES...NEAR NORMAL TEMPS AROUND 90 IN WRN NV VALLEYS AND MID 70S IN THE TAHOE BASIN WITH TYPICAL LATE DAY ZEPHYR BREEZES GUSTING NEAR 25 MPH ARE EXPECTED. THEN TEMPS COOL OFF A FEW MORE DEGREES BY MIDWEEK AS TROF MAKES CLOSER APPROACH TO THE REGION WITH 700 MB TEMPS DROPPING BELOW +10 C AND 500 MB HEIGHTS DROPPING INTO THE MID 570 DM RANGE. INCREASING WINDS ARE ALSO LIKELY WED AFTERNOON WITH POTENTIAL GUSTS IN THE 30-35 MPH RANGE. FOR EACH AFTERNOON NEXT WEEK...500 MB MOISTURE IS INDICATED FOR MINERAL AND MONO COUNTIES ALLOWING FOR SOME CUMULUS FORMATION...BUT LACK OF FORCING...LESS SURFACE HEATING AND WEAK 500-300 MB LAPSE RATES WILL INHIBIT TSTM DEVELOPMENT. IN THE FAR NORTH A FEW SHOWERS MAY FORM WED-THURS AS THE TROF SWINGS INLAND BUT INSTBY NEEDED FOR TSTMS SHOULD REMAIN NORTH OF THE OREGON BORDER BASED ON THE LATEST GUIDANCE DATA. MJD && .AVIATION... VFR THRU FRIDAY WITH NO TSTMS EXPECTED AT ALL TAF SITES. WEST WIND GUSTS 25-30 KT AT KRNO THRU 05Z THIS EVENING...WITH LIGHTER WINDS FOR FRIDAY. FARTHER SOUTH AND EAST...ISOLD -TSRA NEAR KMMH THRU 00Z WITH BETTER TSTM COVERAGE NEAR AND EAST OF HWY 95 ENDING AROUND 04Z. STRONGER CELLS IN W-CNTRL NV MAY PRODUCE SMALL HAIL AND OUTFLOW GUSTS UP TO 40 KT. MJD && .HYDROLOGY... A SMALL STREAM FLOOD ADVISORY CONTINUES FOR MONO COUNTY NEAR AND WEST OF HIGHWAY 395 FOR AT LEAST A COUPLE MORE DAYS. HIGH ELEVATION SNOWMELT CONTINUES TO CAUSE SOME ISSUES WITH BACKCOUNTRY TRAIL FLOODING AND DANGEROUS...SWIFT RUNNING STREAMS. SEE THE MONO COUNTY FLOOD ADVISORY FOR MORE DETAILS. FOR THE MAINSTEM WALKER RIVER...A FLOOD WARNING REMAINS IN EFFECT FOR MINOR FLOODING OF LOW LANDS AND AGRICULTURAL AREAS FROM MASON TO JUST BELOW YERINGTON UNTIL FURTHER NOTICE. NO ROADS OR STRUCTURES ARE THREATENED. FLOODING CONCERNS FROM WABUSKA TO WALKER LAKE HAVE EASED. THE HUMBOLDT RIVER AT IMLAY REMAINS ABOVE ACTION STAGE...AND IS FORECAST TO SLOWLY RISE TO WITHIN A FEW INCHES OF FLOOD STAGE BY EARLY NEXT WEEK. SNYDER && .REV WATCHES/WARNINGS/ADVISORIES... NV...LAKE WIND ADVISORY UNTIL 8 PM PDT THIS EVENING NVZ002. CA...LAKE WIND ADVISORY UNTIL 8 PM PDT THIS EVENING CAZ072. && HTTP://WEATHER.GOV/RENO
The Reno radar (KRGX), 131 km away, was scanning. The volume nearest the first event began at 23:28 UTC.
1 flash flood. Local standard time, as filed.
Lyon County Emergency Management reported a significant amount of water over East Walker and Pine Grove Roads with one truck in water up to the bottom of its cab. The deepest water was in the area of the Flying M Ranch.
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, July 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: 330492.