The combination of afternoon instability as well as increasing mid-level moisture pushing northward on the eastern flank of an upper level low that moved over SoCal and stalled over central-southern California. This upper feature introduced a daily chance of showers and thunderstorms during the first week of June.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
The combination of afternoon instability as well as increasing mid-level moisture pushing northward on the eastern flank of an upper level low that moved over SoCal and stalled over central-southern California. This upper feature introduced a daily chance of showers and thunderstorms during the first week of June.
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 4, 12:05 PM PST, 4 hours 5 minutes earlier.
Area Forecast Discussion National Weather Service Reno NV 105 PM PDT Sun Jun 4 2023 .SYNOPSIS... Showers and storms increase in coverage this afternoon and evening, delivering the chance of locally heavy rain, hail, and gusty winds. Above average temperatures will also encourage increased snowmelt rates through midweek. Elevated shower and thunderstorm chances return early this week along with cooler temperatures. Storms and near-normal temperatures remain in the forecast late week into next week. && .DISCUSSION... Our recent pattern has this forecaster, and likely many of you, wondering just where did that spring/summer ridge go? Well, one ridge parked over the US and Canada border has kept things dry and hot there. Canada has been dealing with hot temperatures and wildfires, which is something we usually start talking about this time of year in the Intermountain West. Another ridge has meandered the west-central Pacific Ocean for a few weeks, which has set us up in the middle with this persistent troughing. And let's talk a bit more about being stuck in the middle, as it pertains to today's forecast. We currently have the remnants of a cut-off center of circulation over the UT/NV border, which will provide moisture and instability from our east. We also have an inbound upper low that will begin to influence our storm behavior this evening into overnight. This could result in a few scenarios, both of which are represented (but not necessarily favored) in CAMs. One outcome could be very much like yesterday, where we will see storms firing over the Sierra that generally stay anchored to the area they initiated from. Yet another possibility involves the 600 mb steering flows shifting from the west- southwest ahead of the incoming low. This would cause the storms to begin to migrate east off the crest a bit before then moving north- northwest into northern Nevada. Storms that stay anchored may produce heavy rainfall amounts, which could lead to localized flash flooding. Any storms that build today additionally could contain small hail, gusty outflow winds and lightning, whether they stay anchored to the Sierra, or move along. Storm chances for the Sierra today are 15-25% for the northern Sierra, but from the Lake Tahoe Basin to the south chances increase to 40-60%. Chances then appear overnight in western Nevada of 10-20%, before we hit the reset button for Monday and set up for more storms. Tomorrow brings us a special case of the Mondays as our storm chances increase even more. The center of the next low will be along the California coast near Los Angeles. And much like it's predecessors, it will be a lingerer. Ensemble guidance indicates the low will meander for the first half of the week around SoCal. Storm chances will again be greatest along the Sierra for Monday (35-65%) while western Nevada gets in on less action (15-35%). Then looking ahead into Tuesday and Wednesday, the threat for storms positions along the Sierra and out into the western Nevada valleys. Chances increase to 25-65%, with the higher chances found along the Sierra crest and the Oregon border. This introduction of more unsettled weather also invites the temperatures to be held in check this week. Daytime convection will provide cloud cover most afternoons, which will limit insolation. As a result, after Monday's above normal highs (mid-to upper-80s in western Nevada, 60s to mid-70s for Sierra locations) we will see a return to near to below normal temperatures. Our averages here in the Reno-Carson-Minden areas hover in the upper-70s to 80, so expect this week's highs to hover around there. For the Tahoe Basin, averages are around mid- to upper-60s, which will be on the scene for this week. Temperatures could also drop in the vicinity of storms due to gusty outflows and rain- cooled air. Tired of hearing the same stormy story yet? Bummer, because I was just getting started! I will try to wrap up by mentioning this stormy trend isn't going anywhere soon. Chances for storms from midweek through the weekend are around 25-50%. Highest chances will again be found along the Oregon border, with some filtering into western Nevada valleys and out over the Basin and Range. Longer term outlooks signal near to below average temperatures to continue, as we stay under the influence of this persistent troughing over the region. HRICH && .AVIATION... * For today, there is a 35-55% of showers and storms in the Sierra affecting terminals KTRK-KTVL-KMMH. There is also a 10-25% chance for showers and thunderstorms in western NV and northeast CA, potentially impacting KRNO-KCXP-KMEV-KLOL. Otherwise, light winds and VFR will prevail. * There is a continued fair chance (10-20%) for patchy fog and attendant MVFR/IFR conditions for KTRK early Sunday morning, particularly between the 10Z-15Z time-frame. * Daily chances for showers and thunderstorm increase area-wide tomorrow through at least Wednesday. Chances are lower into late week, yet still suggesting showers and storms will be in the skies. McKellar/HRICH && .HYDROLOGY... * Warm temperatures today along with clear skies will drive increases in snowmelt into midweek. Developing cumulus could limit the solar insolation and the resulting snow melt late in the afternoons. * Prolonged moderate flooding will persist along the East Fork and Mainstem of the Walker River, with minor flooding anticipated to return to the West Fork through the Walker River Canyon. We'll also see the return of diurnally driven minor flood concerns along the West Fork of the Carson River at Woodfords. Minor flooding is forecast along the Humboldt at Imlay as the snowmelt flood wave arrives this afternoon. * Creeks and streams areawide will be running high, cold, and fast; with some potentially out of banks throughout portions of Mono County. As a result, banks may be unstable so take caution near waterway edges. * Thunderstorm chances return to the Sierra this afternoon with a 35-55% chance for a storm. Thunderstorm chances and coverage increase early this week for the Sierra, northeast CA, and western NV. Plan on a return of heavy rainfall, which may result in bursts of water in already brimming waterways. More storm coverage will provide a return of near or below normal temperatures and clouds, which will slow the diurnally driven snowmelt cycle. - Edan/McKellar && .REV Watches/Warnings/Advisories... NV...None. CA...None. &&
Special Weather Statement National Weather Service RENO NV 1226 PM PDT Sun Jun 4 2023 CAZ070>073-NVZ001>005-061200- 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 1226 PM PDT Sun Jun 4 2023 ...SHOWERS AND THUNDERSTORMS RETURN THIS WEEK... * Scattered to numerous showers and thunderstorms will develop each afternoon this week. Storms will be capable of producing frequent cloud to ground lightning, gusty outflow winds, small hail, and heavy rainfall. * If you have events or recreation outdoors this week, be sure to have a storm safety plan. A top priority should be a way to quickly seek shelter in the event that a thunderstorm forms nearby. If a sturdy building is not immediately available, a hard-top vehicle with the windows rolled up is a good option for protection from lightning. If possible, consider completing outdoor activities (hiking, biking, etc) in the morning before afternoon/evening thunderstorms develop. * Streams and mainstem rivers continue to flow fast and cold. Avoid recreating near fast-running and nearly full waterways or unstable surfaces by riverbanks. Daily showers/thunderstorms will increase the threat of flash flooding. Have a way to receive weather alerts! Get to higher ground immediately if a nearby river or stream rises quickly, if there is debris in the water, or if the water suddenly becomes muddy. http://weather.gov/reno
Special Weather Statement
National Weather Service Reno NV
254 PM PDT Sun Jun 4 2023
CAZ072-NVZ002-042300-
Greater Lake Tahoe Area CA-Greater Lake Tahoe Area NV-
254 PM PDT Sun Jun 4 2023
...A strong thunderstorm will impact portions of Placer, El Dorado
and Douglas Counties through 400 PM PDT...
At 252 PM PDT, Doppler radar was tracking a strong thunderstorm over
South Lake Tahoe, moving northeast at 15 mph.
HAZARD...Winds in excess of 40 mph, heavy rain and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
South Lake Tahoe, Bliss State Park, Glenbrook, Zephyr Cove, Emerald
Bay, Zephyr Cove-Round Hill Village, Sugar Pine Point S, Kingsbury,
South Lake Tahoe Airport, William Kent Campground, Stateline, Meeks
Bay, Fallen Leaf Campground, Meeks Bay Campground and Sunnyside-Tahoe
City.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
If on or near Lake Tahoe, get out of the water and 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 3885 11993 3890 12013 3914 12017 3909 11990
TIME...MOT...LOC 2152Z 208DEG 12KT 3891 11999
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
ELThe Reno radar (KRGX), 119 km away, was scanning. The volume nearest the first event began at 00:08 UTC.
1 debris flow, 1 high wind, 1 funnel cloud. Local standard time, as filed.
CHP reported rock and debris flow on the westbound lane of SR89 near Indian Creek road, located 1.0 ENE of Markleeville, CA.
Mesonet station (XMLC1) Mill Canyon located 4.0 mi SSW of Walker, CA, reported a peak wind of 73 mph.
The public reported a Funnel Cloud 1.0 mile SE of Twins Lakes.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2023Every state in 2023This day in weather historyWarnings in California, June 2023
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: 1130427, 1130429, 1130428.