A cool and wet pattern will persist through mid-week as an upper level low remains stalled off the central California coast. An anomalously deep low pressure system yield periods of light to moderate precipitation with a few isolated thunderstorms through Wednesday before the low ejects 19-20 Sept before ejecting northeast 21-22 Sept into the northern Rockies.
Every event with a place to put it. Tap one for its entry below.
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.
A cool and wet pattern will persist through mid-week as an upper level low remains stalled off the central California coast. An anomalously deep low pressure system yield periods of light to moderate precipitation with a few isolated thunderstorms through Wednesday before the low ejects 19-20 Sept before ejecting northeast 21-22 Sept into the northern Rockies.
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 Sep 20, 1:40 AM PST, 5 hours 20 minutes earlier.
Area Forecast Discussion National Weather Service Reno NV 240 AM PDT Tue Sep 20 2022 .SYNOPSIS... A cool and wet pattern continues through mid-week with additional chances for rain, isolated thunderstorms, and high elevation snow. This storm system will exit by Thursday, with warmer and drier conditions for the weekend into the start of the following week. && .DISCUSSION... * Few changes to the forecast thinking overnight. An area of low pressure continues to sit just off the northern CA coast with several vorticies rotating around the main low. As the system begins to occlude and slowly fill, it will lift toward the east- northeast across northern CA/NV and into OR/ID Wednesday. This system will continue to bring periods of rain and high elevation (9000'+) snow to the region, along with chances for thunderstorms. * Some rather impressive rainfall totals so far with 1-2" into the western slopes of the Sierra, 0.5-1" in northeast CA, and around 0.5" into the Tahoe Basin. Lighter amounts generally under 0.25" have fallen in far western Nevada. We realize those amounts don't sound like much, but to put it into a climatological perspective, this tends to be one of the driest times of the year for the region. So it's significant for mid-late September and will certainly put a lid on fire season for the northern Sierra into northeast CA for at least a little while. * Additional rainfall of 0.5-1" is anticipated for the Sierra from Alpine County north and across northeast CA, with a few hundredths up to several tenths of an inch into northwestern NV. The areas least likely to see much if any rainfall include southern Mono Co (near and south of Mono Lake) and areas of western NV near and east of US-95. The best spillover period into northwest NV will be late today into Wednesday as the low lifts out of the region. * Thunderstorms remain possible this afternoon and again Wednesday afternoon, a 15-30% chance at any given location. A few nocturnal storms are on the table tonight as we destabilize under the cold core of the low, a 10-20% chance. Shower chances are higher (30- 60%) and shifting from west to east overnight as the low progresses eastward. At this point, HRRR hourly rainfall rates look to peak out 0.5-0.75"/hour in any storms that may develop. While not a screaming flash flood threat, especially given the storm motions of 25-30 kts, we'll certainly want to monitor burn scars, particularly in northeast CA, including Dixie, Sheep, and Walker. * A couple more days on tap with high temperatures 10-20 degrees below normal. Overnight lows will be moderated by clouds with the coldest night anticipated Wednesday night into Thursday morning as skies begin to clear. Widespread 20s in Sierra valleys are expected, with temperatures approaching freezing in colder western Nevada valleys, and remaining in the 40s for urban centers. The other consideration Wednesday and possibly Thursday nights will be the formation of fog/freezing fog, particularly in fog prone valleys with recent rainfall (Martis, Sierra, etc). * Behind this low, we'll see warmer and drier conditions to end the week. By the weekend and early part of next week, highs look to reach 5-10 degrees above normal per NBM guidance. A little weather whiplash...that's a transition season for you! In this forecaster's opinion it'll be a perfect time to enjoy the outdoors with warm days, seasonably cool nights, light winds, and mostly clear skies. -Dawn && .AVIATION... * Periods of showers to continue through Wednesday with generally low-end VFR conditions, but widespread terrain obscuration due to lower ceilings. There is a 15-30% chance for thunderstorms at any given location near and north of KMMH this afternoon and again Wednesday afternoon, with a 10-20% chance tonight. Best rain chances will progress from the northern Sierra and northeast CA today eastward into western Nevada overnight into Wednesday as an area of low pressure treks toward the ENE. * Gusty SW winds to 25 kts are possible mainly near and south of a KBAN-KHTH line, with stronger southerly winds across southern into eastern Nevada where FL100 winds will be sustained 25-35 kts. * This storm will exit with lighter winds and clearing skies Thursday into the weekend. The only concern will be the development of FG/FZFG Wednesday and Thursday nights in fog prone valleys, including at KTRK. -Dawn && .REV Watches/Warnings/Advisories... NV...None. CA...None. &&
Special Weather Statement National Weather Service RENO NV 300 AM PDT Tue Sep 20 2022 CAZ070>073-NVZ001>005-211130- 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 300 AM PDT Tue Sep 20 2022 ...Cold and Wet Through Wednesday... * An early season storm will continue bringing cool temperatures and chances for rain, and even some snow for elevations above 9000 feet, through Wednesday. Overall liquid totals will be highest for the northern Sierra into northeast California, with much less, if anything, from southern Mono County to areas of western Nevada east of Highway 95. * There is a 15-30% chance for thunderstorms at any given location each afternoon, with a 10-20% chance overnight. While overall rain rates do not appear excessive, burn scars in northeast CA, such as Dixie, Walker, and Sheep, will still need to be monitored for flood threats. * It will be rather damp and chilly through Wednesday with daytime temperatures 10-20 degrees below average. Cloud cover will moderate overnight lows through tonight, with Wednesday night likely to be the coldest night as skies begin to clear. Overnight lows could drop into the 20s in colder Sierra valleys, with typically colder spots in western Nevada dipping to near freezing. * While snow will be limited to mainly areas above 9000-9500', keep in mind travel can still be impacted by wet roads and lowered visibility. Allow extra time, especially if you are traveling across the Sierra. http://weather.gov/reno
The national radar mosaic for the moment the first event began.
2 heavy rain. Local standard time, as filed.
CO-OP observer station (INVN2), located 1.2 mi E of Incline Village, along with Mesonet stations KNXN2 (2.0 mi N of Incline Village) and EW1336 (2.0 mi NNW of Diamond Peak Ski Resort) reported heavy rainfall amounts of 0.87, 0.92, and 0.86 inches respectively.
Mesonet stations SKYN2-Skyland (2.0 mi NNE of Zephyr Cove, NV) and FW9917 (in Glenbrook, NV) reported heavy rainfall amounts of 0.54 and 0.63 inches respectively.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2022Every state in 2022This day in weather historyWarnings in Nevada, September 2022
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: 1055553, 1055554.