An upper-level area of low pressure near the California coast and a ridge axis over the eastern Great Basin combined to bring increased south to southeast flow into western Nevada and aided in producing a focusing mechanism for thunderstorms. These thunderstorms produced localized areas of heavy rainfall in far western Nevada.
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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.
An upper-level area of low pressure near the California coast and a ridge axis over the eastern Great Basin combined to bring increased south to southeast flow into western Nevada and aided in producing a focusing mechanism for thunderstorms. These thunderstorms produced localized areas of heavy rainfall in far western Nevada.
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 Aug 22, 12:06 PM PST, 2 hours 39 minutes earlier.
Area Forecast Discussion National Weather Service Reno NV 106 PM PDT Tue Aug 22 2017 .Synopsis... Scattered to numerous thunderstorms are expected through this evening. Flash flooding is the main hazard. Storms will return Wednesday but coverage is not expected to be as much as today. Drier and hotter weather will return starting Thursday into this weekend and potentially much of next week. Record highs are possible. && .Discussion... So if you were thinking that summer is largely over, think again... * With precipitable waters in the "sweet spot" of 0.6 to 0.8" and weak upper low nearby, afternoon and evening thunderstorms will remain an issue through tomorrow. Short range guidance indicates today should have the most coverage compared to Wednesday. Storm motions today are not overly slow but 18z sounding, radar trends, and high-res guidance all suggest training is a good possibility. So flash flooding remains our primary hazard today. A few strong/severe storms possible today with hail and strong winds, but tomorrow could have a greater risk of severe with stronger flow aloft and increased low level westerly convergence zones. * Ridge builds in starting Thursday and based on ECMWF, GEFS guidance it has the potential to be unusually strong and long lasting, into next week. This will yield hot temperatures compared to late-August norms, even close to some record highs this weekend. Hitting 100 at RNO not out of the question at some point Sunday-Tuesday. This is abnormal since our frequency of 100+ usually drops off a cliff after mid-August. Since 1893 Reno has only hit 100+ 7 times after August 22nd. Zephyr type westerly winds and mountain buildups likely as well each day starting Thursday. -Chris .Aviation... * Thunderstorms will be the main issue for flying today and Wednesday. Coverage could become numerous in some areas today impacting enroute and approach/departure routes in the region including at RNO. Roughly about a 40-60% chance of thunderstorms directly impacting terminals today between 20z-03z. Storm motions to the NW 10-15 kts. Wednesday storm coverage looks to be less than today in high-res guidance and with more of a westerly flow aloft storms will kick off the Sierra quicker. So about a 10-20% chance of storms for TVL,TRK,MMH and 30% for RNO,CXP in the afternoon and early evening. * Outside of storms, just a few issues to note. If the TRK area receives heavy rainfall today then fog or stratus would likely be an issue Wednesday morning if skies clear enough. For Friday into early next week, unusually warm temperatures will drive up density altitudes that may impact some aircraft during peak heating times of day. Weak to moderate westerly zephyr winds each afternoon from Thursday into the weekend. -Chris && .REV Watches/Warnings/Advisories... NV...None. CA...None. && For more information from the National Weather Service visit... http://weather.gov/reno
Special Weather Statement National Weather Service RENO NV 111 PM PDT Tue Aug 22 2017 CAZ070>073-NVZ001>005-222200- Surprise Valley California-Lassen-Eastern Plumas- Eastern Sierra Counties-Greater Lake Tahoe Area-Mono County- Mineral and Southern Lyon Counties-Greater Reno-Carson City- Minden Area-Western Nevada Basin and Range including Pyramid Lake- Northern Washoe County- Including the cities of Cedarville, Eagleville, Fort Bidwell, Portola, Susanville, Westwood, Sierraville, Loyalton, South Lake Tahoe, Tahoe City, Truckee, Markleeville, Bridgeport, Coleville, Lee Vining, Mammoth Lakes, Hawthorne, Yerington, Smith Valley, Mina, Schurz, Stateline, Glenbrook, Incline Village, Sparks, Verdi, Gardnerville, Virginia City, Fernley, Fallon, Lovelock, Silver Springs, Nixon, Imlay, Empire, and Gerlach 111 PM PDT Tue Aug 22 2017 ...Thunderstorms Continue to Develop... * At 1 PM, scattered storms continue to develop across western Nevada and the Sierra. Through 3 PM the greatest concentration of storms will be from roughly along a Reno/Tahoe to Carson Valley to Hawthorne line. Storm movement is to the north- northwest at 10-15 mph. * Flash flooding is the primary hazard from storms today with rainfall amounts exceeding 1 inch per hour likely. Storms can also produce lightning, accumulating hail, and strong outflow winds to 50 mph. * If you're out on one of the many area lakes or trails, now is the time to consider getting to safe shelter before lightning becomes a serious hazard. Also do not set up camp near a creek bed that easily channel flash floods. People near flash flood prone areas such as steep terrain and burn scars should be prepared to respond quickly if flooding is observed. http://weather.gov/reno
Special Weather Statement National Weather Service Reno NV 219 PM PDT TUE AUG 22 2017 CAZ072-NVZ002-003-222215- Greater Lake Tahoe Area CA-Greater Lake Tahoe Area NV-Greater Reno- Carson City-Minden Area NV- 219 PM PDT TUE AUG 22 2017 ...STRONG THUNDERSTORM OVER EASTERN PORTION OF LAKE TAHOE... At 217 PM PDT, Doppler radar was tracking a strong thunderstorm near Spooner Summit, or 7 miles south of Incline Village, moving north at 10 mph. Heavy rain, small hail and wind gusts up to 50 mph will be possible with this storm. Locations impacted include... Incline Village, Crystal Bay, Spooner Summit, Mount Rose, including Highways 28, 431 and 50. PRECAUTIONARY/PREPAREDNESS ACTIONS... Hikers and boaters near the east shore of Lake Tahoe should move indoors or inside a vehicle. Remember, lightning can strike out to 10 miles from the parent thunderstorm. If you can hear thunder, you are close enough to be struck by lightning. Move to safe shelter now! Do not be caught on the water in a thunderstorm. && LAT...LON 3907 11984 3903 11996 3929 12010 3936 11987 TIME...MOT...LOC 2115Z 167DEG 8KT 3915 11993 Brong
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RENO NV
250 PM PDT TUE AUG 22 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0250 PM HAIL 1 ENE PLEASANT VALLEY 39.36N 119.75W
08/22/2017 M0.25 INCH WASHOE NV TRAINED SPOTTER
TRAINED WEATHER SPOTTER REPORTED PEA SIZED HAIL AND
MODERATE RAIN.
&&
MCGUIREPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RENO NV
318 PM PDT TUE AUG 22 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0316 PM HEAVY RAIN 1 ENE PLEASANT VALLEY 39.36N 119.75W
08/22/2017 M0.55 INCH WASHOE NV MESONET
WASHOE COUNTY ALERT GAUGE MEASURED 0.55 INCHES OF
RAINFALL IN 15 MINUTES AT THE STEAMBOAT GAUGE.
&&
MCGUIREPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RENO NV
320 PM PDT TUE AUG 22 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0319 PM FLASH FLOOD HIRSCHDALE 39.37N 120.07W
08/22/2017 NEVADA CA LAW ENFORCEMENT
CHP REPORTING ROADWAY FLOODING ALONG INTERSTATE 80 AND
THE HIRSHDALE EXIT.
&&
MCGUIREPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RENO NV
336 PM PDT TUE AUG 22 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0333 PM FLOOD 1 E TRUCKEE 39.33N 120.18W
08/22/2017 NEVADA CA DEPT OF HIGHWAYS
6-8 INCHES OF STANDING WATER ON WESTBOUND INTERSTATE 80
BETWEEN OVERLAND AND THE AGRICULTURE STATION.
&&
MCGUIREThe national radar mosaic for the moment the first event began.
1 debris flow, 1 flood. Local standard time, as filed.
An area of pulse thunderstorms caused boulders to slide onto Nevada State Highway 28 at mile marker 3. No damage reports/estimates were available.
Nevada Department of Transportation reported water over roadway along Interstate-580 and Damonte Ranch Parkway from a line of thunderstorms. Multiple vehicle accidents were reported, however, no estimate of damages were reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2017Every state in 2017This day in weather historyWarnings in Nevada, August 2017
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: 720653, 720662.