A strong closed upper low pressure system moved eastward across southern California on June 11. This system pulled up wrap around moisture and spread it westward into central California.
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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 HNX wrote it up.
A strong closed upper low pressure system moved eastward across southern California on June 11. This system pulled up wrap around moisture and spread it westward into central California. While most locations reported light rainfall, showers and thunderstorms did produce locally heavy rainfall at some mountain RAWS stations during the afternoon and evening. One cell also produced roadway flooding in a flood prone area on the Mojave Desert resulting in some road closures during the evening of June 11.
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 Hanford, CA wrote its last area forecast discussion before the first event at Jun 11, 11:35 AM PST, 3 hours 43 minutes earlier.
Area Forecast Discussion National Weather Service Hanford CA 1235 PM PDT Sun Jun 11 2023 .SYNOPSIS... A low pressure system moving across Southern California will provide for showers and thunderstorms across the mountains through Tuesday. A chances of precipitation possible over portions of the San Joaquin Valley and desert areas this Sunday. Chances of precipitation gradually decrease through the week. High temperatures will cool a few degrees today and Monday then trend warmer through the end of the week. Temperatures going above normal across the San Joaquin Valley by next Friday. && .DISCUSSION... A disturbance currently over Southern California will push clouds and precipitation across Central California today. Upper-air analysis has the Closed Low centered near San Bernardino and expected to push further east today. Upper-air observations from this morning show above normal precip-water value that were reaching the 90th percentile. With values near a quarter (0.75) of an inch, rain/snow rates will be higher today as runoff from Sierra Nevada rivers will increase. Based on freezing levels, a combination of rain and snow has been observed with rain dominating this afternoon’s activity. Will maintain the flood warning for the Merced River in Yosemite NP and monitor the Sierra Nevada as additional showers move in later today. With the slow and somewhat less predicable nature of the Closed-Low, will continue to observed Sierra Nevada precipitation through Tuesday. Confidence remains high in the trajectory of the Closed-Low as the crosses Southern California and moves toward Las Vegas overnight. Ensemble upper-air analysis still showing minimal error in its development of a Closed Low circulation pattern over Southern California through Monday. Yet, due to the nature of closed low’s, ensemble errors grows slightly as the closed low attempts to eject toward the Rockies and Mid-West. Therefore, probability of precipitation may not drop-off to near zero over the Sierra Nevada through Tuesday as lingering unsettled conditions continue to produce mountain showers. Ensemble mean CAPE and Storm Relative Helicity both favor the Sierra Nevada today as the mountain range will see probability of thunder in the 40 to 50 percent range. By Monday, both the percentages and coverage of convective activity both drop-off slightly with convection becoming less likely under a more easterly flow pattern. At that point, ensemble place the center of the closed- low closer toward Southwestern Utah. Ensemble begin the transition toward a dry solution on closer to Wednesday with probability of exceedance of reaching 0.01 of rain struggling to approach 10 percent. The percentage drop off even further going into the remainder of the week. While the San Joaquin Valley dries out, temperatures will go into the warming trend. Yet, probability of exceedance (PoE) of reaching 95 degrees does not go above 50 percent until next Friday. PoE of reaching 95 degrees is even better on Saturday, yet, begins another downward-turn on Sunday as long range Cluster Analysis signals toward the passage of another disturbance. The up and down nature of temperatures and moisture continues across Central California for another week. && .AVIATION... MVFR conditions possible in and around thunderstorms with areas of mountain obscuring IFR conditions possible near showers and thunderstorms in the Sierra Nevada and Tehachapi Mountains. Probability of thunderstorms across the Sierra Nevada and Tehachapi Range between 40 to 50 percent until 05Z Monday. Otherwise, VFR conditions will prevail across the central CA interior through at least the next 24 hours. && .AIR QUALITY ISSUES... None. && .CERTAINTY... The level of certainty for days 1 and 2 is high. The level of certainty for days 3 through 7 is medium. Certainty levels include low...medium...and high. Please visit www.weather.gov/hnx/certainty.html for additional information and/or to provide feedback. && .HNX WATCHES/WARNINGS/ADVISORIES... None. && Operations.....Molina Social Media...EW weather.gov/hanford
Special Weather Statement
National Weather Service San Joaquin Valley CA
1127 AM PDT Sun Jun 11 2023
CAZ317-318-323-324-326-111900-
Yosemite Valley CA-Mariposa-Madera Lower Sierra CA-
Yosemite NP outside of the valley CA-Mariposa Madera Foothills CA-
Upper San Joaquin River CA-
1127 AM PDT Sun Jun 11 2023
...A strong thunderstorm will impact portions of northeastern
Mariposa and north central Madera Counties through NOON PDT...
At 1126 AM PDT, Doppler radar was tracking a strong thunderstorm 7
miles south of Yosemite Valley, or 9 miles northeast of Yosemite
South Entrance, moving northwest at 20 mph.
HAZARD...Winds in excess of 30 mph 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...
Yosemite National, Yosemite Valley, Yosemite Glacier Point, Ostrander
Lake, El Portal, Bridalveil Creek Campground, Badger Pass Ranger
Station, Camp 4 Campground and Buck Camp Ranger Station.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3762 11936 3750 11945 3763 11983 3779 11967
TIME...MOT...LOC 1826Z 113DEG 17KT 3763 11956
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH
EWSpecial Weather Statement
National Weather Service San Joaquin Valley CA
139 PM PDT Sun Jun 11 2023
CAZ337>339-112115-
Indian Wells Valley CA-Mojave Desert CA-Mojave Desert Slopes CA-
139 PM PDT Sun Jun 11 2023
...A strong thunderstorm will impact portions of eastern Kern County
through 215 PM PDT...
At 139 PM PDT, Doppler radar was tracking a strong thunderstorm 13
miles south of Inyokern, or 16 miles southwest of Ridgecrest, moving
south at 5 mph.
HAZARD...Winds in excess of 30 mph 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.
This storm will remain over mainly rural areas of eastern Kern
County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3553 11787 3551 11777 3530 11785 3535 11805
TIME...MOT...LOC 2039Z 017DEG 6KT 3547 11787
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH
MolinaSpecial Weather Statement
National Weather Service San Joaquin Valley CA
237 PM PDT Sun Jun 11 2023
CAZ337>339-112200-
Indian Wells Valley CA-Mojave Desert CA-Mojave Desert Slopes CA-
237 PM PDT Sun Jun 11 2023
...A strong thunderstorm will impact portions of southeastern Kern
County through 300 PM PDT...
At 237 PM PDT, Doppler radar was tracking a strong thunderstorm near
Randsburg, or 19 miles south of Ridgecrest, moving south at 5 mph.
HAZARD...Winds in excess of 30 mph 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...
California City, Randsburg, Laurel Mountain, North Edwards and
Government Peak.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3492 11813 3537 11802 3559 11764 3556 11763
3507 11763
TIME...MOT...LOC 2137Z 342DEG 4KT 3536 11774
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH
MolinaSpecial Weather Statement
National Weather Service San Joaquin Valley CA
342 PM PDT Sun Jun 11 2023
CAZ331>333-338-112315-
Piute Walker Basin CA-South End of the Upper Sierra CA-
Kern River Valley CA-Mojave Desert Slopes CA-
342 PM PDT Sun Jun 11 2023
...A strong thunderstorm will impact portions of northeastern Kern
and southern Tulare Counties through 415 PM PDT...
At 341 PM PDT, Doppler radar was tracking a strong thunderstorm 9
miles northwest of Onyx, or 38 miles west of Ridgecrest, moving
southeast at 25 mph.
HAZARD...Winds in excess of 40 mph 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...
Weldon, Onyx, South Lake Cdp, Kernville, Walker Pass and Riverkern.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3575 11846 3589 11832 3569 11796 3549 11818
TIME...MOT...LOC 2241Z 311DEG 21KT 3577 11833
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
JPK/CMThe national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
California Highway Patrol reported roadway flooding at the intersection of Garlock Rd. and Redrock-Randsburg Rd.
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: 1093749.