An upper level low pressure system brought periods of cool weather with windy and rainy conditions to Southern California. Gusty winds in excess of 60 MPH were reported along with some light precipitation of up to a half inch from the coast to the mountains.
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 SGX wrote it up.
An upper level low pressure system brought periods of cool weather with windy and rainy conditions to Southern California. Gusty winds in excess of 60 MPH were reported along with some light precipitation of up to a half inch from the coast to the mountains.
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 San Diego, CA wrote its last area forecast discussion before the first event at Jun 5, 8:20 AM PST, 3 hours 40 minutes earlier.
Area Forecast Discussion
National Weather Service San Diego CA
920 AM PDT Fri Jun 5 2020
.SYNOPSIS...
A low pressure system moving inland through southern California
will bring cooler weather, along with more clouds and light
precipitation mountains westward through Saturday morning. Strong
winds will hit areas of the mountains and deserts this afternoon
through Saturday night. Higher pressure will bring dry and warmer
weather next week before an approaching low pressure trough brings
cooler weather late next week.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
Who says June weather is boring? There's a lot to talk about. An
upper level trough to our southwest will move through Southern
California today and tonight. It has already spun up a healthy
coastal eddy that has deepened our marine layer to almost 5,000
feet this morning. The cloud is pretty thick within that layer,
so there has been widespread drizzle and even a few legit rain
showers. Lots of places have reported a trace to 0.04 inch so
far. A band of mid-high clouds slowly tracking across our region
might be contributing to the lift in the marine layer. Any
clearing west of the mountains today will be quite random. As the
trough moves directly over Southern California this afternoon and
tonight, the marine layer will continue to deepen, but also show
more unstable properties. This should result in scattered
convective rain showers anywhere from the coast to the mountains
(but more likely inland and mountains) this evening into Saturday
morning. The instability will weaken the marine inversion and the
cloud deck will be more disorganized and bumpy, allowing for
better cloud breakup Saturday and probably a reverse clearing
pattern, coast first and foothills last. Winds will pick up this
afternoon with the usual top spots of mountain passes and desert
slopes gusting 50-60 mph. Winds will decrease Saturday morning,
but come back during the afternoon and evening. A wind advisory is
in effect until early Sunday morning. A battered marine layer
will survive the beating from the trough, so low clouds will
remain west of the mountains Sunday, although fewer and without
uniform coverage. A trough to our north moves through the western
states Monday. That cold front to the north will produce high
pressure in the Great Basin, pushing flow offshore over Southern
California. We should get some offshore breezes later Monday and
early Tuesday. At the same time high pressure aloft amplifies a
little, so there will be a decent warming trend Sunday into
Tuesday. The offshore flow will make the warming a little sharper
west of the mountains Monday and Tuesday. Any coastal clouds left
over on Monday will probably disappear entirely Tuesday possibly
into Wednesday. Offshore flow weakens Wednesday and a Pacific
trough of low pressure deepens and slowly approaches California
Thursday. These factors will help the marine layer rebuild to
bring back coastal clouds and cooler weather west of the mountains
Thursday and Friday. For inland areas, especially mountains and
deserts, Wednesday and Thursday might be the warmest days.
Temperatures will go above normal Tuesday through Wednesday at
least, but do not appear extreme at this time. The trough slowly
trudges through the West next weekend keeping our weather on the
cool side.
&&
.AVIATION...
051430Z...Coast/Valleys...OVC018-028 with tops to 4,500 ft MSL will
continue through late morning. Slight clearing is likely for inland
valleys 18Z-01Z this afternoon, however coastal areas are expected
to remain under prevailing BKN CIGS for most of the day, with about
a 25% chance of brief scattering between 21Z and 01Z. CIGS will fill
in again after 01Z this evening, affecting all areas west of the
mountains. Bases may lower a few hundred feet, ranging between 1,500-
2,200 ft MSL. Expect periods of drizzle and light rain overnight,
with VIS 3-5 miles at times. On elevated coastal terrain obscured by
clouds, VIS may lower to 1 mile.
Mountains and deserts...Strong W/NW surface winds will develop this
afternoon from the mtn crests eastward, especially after 21Z,
spreading across the desert slopes and floors. Sustained winds
between 20 and 35 kts will be possible, with peak gusts to 45 kts
(more likely 35 kts at PSP/TRM). LLWS can be expected in these
areas, along with strong up/down drafts.
&&
.MARINE...
Northwest winds will strengthen on Saturday afternoon, with peak
gusts nearing or slightly exceeding 20 kts over the Outer Waters
Saturday evening/night. After weakening somewhat Sunday morning,
another surge of gusty NW winds will occur Sunday evening/night,
with peak gusts to 25-30 kts. This will result in conditions
hazardous to Small Craft, particularly for the Outer Waters, but
bleeding into portions of the Inner Waters at times as well. Winds
will weaken after Sunday night.
&&
.BEACHES...
Lingering long-period S/SW swell may generate locally elevated surf
at the beaches today, particularly in Orange County, with local sets
to 5 or 6 FT possible. Surf will gradually subside Sunday and into
early next week.
&&
.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory from 3 PM this afternoon to 5 AM PDT Sunday for
Coachella Valley-Riverside County Mountains-San Diego
County Deserts-San Diego County Mountains-San Gorgonio Pass
Near Banning.
PZ...NONE.
&&
PUBLIC...MM
AVIATION/MARINE/BEACHES...RodriguezThe national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
Gusty westerly winds occurred, highest near the foothills of the San Bernardino Mountains. Winds 40-50 MPH reported, some sites as high as 67 MPH at Whitewater.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2020Every state in 2020This day in weather historyWarnings in California, June 2020
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: 899703.