Strong and gusty northerly winds developed in the mountains of Ventura and Los Angeles counties. Wind gusts up to 60 MPH were reported.
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 LOX wrote it up.
Strong and gusty northerly winds developed in the mountains of Ventura and Los Angeles counties. Wind gusts up to 60 MPH were reported.
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 Los Angeles, CA wrote its last area forecast discussion before the first event at Apr 12, 4:54 PM PST, 59 minutes earlier.
Area Forecast Discussion...UPDATED
National Weather Service Los Angeles/Oxnard CA
554 PM PDT Thu Apr 12 2018
.SYNOPSIS...12/147 PM.
Gusty winds are forecast into Friday. A high and offshore flow
should arrive on Friday and Saturday and bring above normal
temperatures. A couple of lows will arrive, one late Sunday into
Monday, the other on Wednesday night into Thursday, to bring
possible precipitation. The temperatures will be near normal for
most of next week.
&&
.SHORT TERM (TDY-SUN)...12/254 PM.
Strong north to northwest wind in progress today with wind
advisories/warnings covering much of the area. Winds to continue
through at least this evening and in many areas through Friday
morning. In fact, another peak of strong winds is expected later
tonight in and around the Santa Ynez Range, especially the
eastern portion as northwest flow shifts to northeast. The SBA-BFL
gradient increases to almost -6mb Friday morning and with the
excellent support aloft this should generate warning level winds
with gusts in excess of 60 mph, especially favoring the hills
above Montecito. In other areas winds should generally be
decreasing overnight (but remain windy) as the shift to northeast
continues through Friday morning.
The turn to offshore along with the building ridge on the west
coast will lead to a much warmer day, especially inland where cold
air advection from the previous trough kept temps down today.
The warming trend will continue Saturday with morning gradients
now expected to only be similar to Friday but with much weaker
upper level support. As a result advisory level winds not expected
but still some locally gusty breezes in the favored areas of
LA/Ventura counties. Highs mostly in the upper 70s and 80s area-
wide.
A cooling trend will begin for coast/valleys Sunday as a trough
approaches from the west and gradients turn strongly onshore.
.LONG TERM (MON-THU)...12/205 PM.
A deep trough will hit the west coast Monday. While models have
been in decent agreement with the timing and strength they have
been less consistent with the southern extent and amount of
moisture and thus confidence not super high for rain. Best chances
are north of Pt Conception and amounts expected to be a quarter
inch or less, so ultimately it could end up being a high PoP/low
QPF event but for now keeping pops in the chance category up north
and below 15 in the south.
Again the main impact from this trough will be wind with strong
west to northwest winds Monday and Monday night. In addition,
highs Monday will be several degrees below normal. After a quick
little ridge pops up for warmer temps Tuesday another trough will
follow Wed/Thu. Fairly big differences in how the models are
handling this one with the GFS farther west and south and wetter
while the ECMWF is north and more of an inside slider. Agree with
low pops in for now along with cooler temps and gusty onshore
winds.
&&
.AVIATION...13/0053Z.
At 00Z, there was no marine inversion at KLAX.
VFR conditions are expected throughout the period, except for a
chance of VLIFR to LIFR conditions at KPRB in fog and MVFR
conditions in blowing dust and sand at desert terminals. Periods
of moderate to strong wind shear and turbulence are likely at all
terminals through 16Z at the latest.
KLAX...High confidence in VFR conditions throughout the period.
Periods of moderate low-level wind shear and turbulence are
likely between 04Z and 10Z. North winds greater than 20 knots are
likely through 09Z.
KBUR...High confidence in VFR conditions throughout the period.
Periods of moderate to strong low-level wind shear and turbulence
are likely through 16Z.
&&
.MARINE...12/113 PM.
Widespread gale force winds are expected across all waters today
in the wake of a dry cold front that has almost exited the
southern waters. The winds will continue through the night, except
decrease in coverage for the inner waters after midnight. Conditions
are expected to improve somewhat on Friday.
However, there is also a large northwest swell moving through the
coastal waters and in combination with the winds will create very
rough seas through tonight. The swell is expected to gradually
subside on Friday.
&&
.LOX WATCHES/WARNINGS/ADVISORIES...
CA...High Surf Advisory in effect until 5 PM PDT Friday for zones
34-35. (See LAXCFWLOX).
Wind Advisory in effect until 10 PM PDT this evening for
zones 34>36-40-87. (See LAXNPWLOX).
High Wind Warning in effect until noon PDT Friday for zones
39-52. (See LAXNPWLOX).
High Surf Advisory in effect until 8 AM PDT Friday for zones
39>41-87. (See LAXCFWLOX).
Wind Advisory in effect until noon PDT Friday for zones
41-44-45-88-547. (See LAXNPWLOX).
Wind Advisory in effect until 6 PM PDT this evening for zone
46. (See LAXNPWLOX).
High Wind Warning in effect until 1 AM PDT Friday for zones
46-53-54-59. (See LAXNPWLOX).
PZ...Gale Warning in effect until 11 PM PDT this evening for zones
645-650-655. (See LAXMWWLOX).
Gale Warning in effect until 5 AM PDT Friday for zones
670-673-676. (See LAXMWWLOX).
&&
.HAZARD POTENTIAL OUTLOOK (SUN-THU).
Gusty northwest winds will be possible Monday into Monday night.
&&
PUBLIC...MW
AVIATION...Hall
MARINE...Sweet
SYNOPSIS...STu
weather.gov/losangelesPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OXNARD CA
536 PM PDT THU APR 12 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0600 PM NON-TSTM WND GST 13 NNW CUYAMA 35.10N 119.77W
04/11/2018 M41.00 MPH SAN LUIS OBISPO CA MESONET
SUSTAINED SOUTHWEST WINDS OF 41 MPH AT CARRIZO RAWS,
ELEVATION 2490 FEET.
0655 PM HIGH SUST WINDS 1 W GAVIOTA 34.47N 120.23W
04/11/2018 M52.00 MPH SANTA BARBARA CA MESONET
SUSTAINED NORTH WINDS OF 52 MPH NEAR GAVIOTA STATE PARK,
ELEVATION 88 FEET.
0709 PM HIGH SUST WINDS 2 NW GAVIOTA 34.49N 120.24W
04/11/2018 M40.00 MPH SANTA BARBARA CA MESONET
SUSTAINED NORTHWEST WINDS OF 40 MPH GUSTING TO 56 MPH AT
GAVIOTA RAWS, ELEVATION 878 FEET.
0806 PM HIGH SUST WINDS 4 N REFUGIO STATE BEACH 34.52N 120.08W
04/11/2018 M43.00 MPH SANTA BARBARA CA MESONET
SUSTAINED NORTH WINDS OF 43 MPH GUSTING TO 53 MPH AT
REFUGIO RAWS, ELEVATION 1465 FEET.
1257 AM HIGH SUST WINDS 6 SSW CASTAIC LAKE 34.57N 118.74W
04/12/2018 M41.00 MPH LOS ANGELES CA MESONET
SUSTAINED NORTHWEST WINDS OF 41 MPH GUSTING TO 62 MPH AT
WHITAKER PEAK RAWS, ELEVATION 4120 FEET.
0443 AM HIGH SUST WINDS 5 N SANTA BARBARA 34.50N 119.73W
04/12/2018 M45.00 MPH SANTA BARBARA CA MESONET
SUSTAINED NORTH WINDS OF 45 MPH AT LA CUMBRE PEAK,
ELEVATION 3820 FEET.
0700 AM HIGH SUST WINDS 4 NNW LANCASTER 34.74N 118.21W
04/12/2018 M40.00 MPH LOS ANGELES CA ASOS
SUSTAINED WEST WINDS OF 40 MPH GUSTING TO 45 MPH AT
WILLIAM J. FOX FIELD, ELEVATION 2333 FEET.
0810 AM HIGH SUST WINDS 2 NNE PALMDALE 34.63N 118.08W
04/12/2018 M40.00 MPH LOS ANGELES CA ASOS
SUSTAINED WEST WINDS OF 40 MPH GUSTING TO 45 MPH AT
PALMDALE AIRPORT, ELEVATION 2543 FEET.
0855 AM HIGH SUST WINDS 4 NNE SAN FERNANDO 34.35N 118.42W
04/12/2018 M42.00 MPH LOS ANGELES CA MESONET
SUSTAINED NORTHWEST WINDS OF 42 MPH GUSTING TO 53 MPH AT
CAMP NINE RAWS, ELEVATION 4000 FEET.
0213 PM HIGH SUST WINDS 33 S REFUGIO STATE BEAC 33.98N 120.08W
04/12/2018 M41.00 MPH SANTA BARBARA CA MESONET
SUSTAINED NORTHWEST WINDS 41 MPH GUSTING TO 56 MPH AT
SANTA ROSA ISLAND RAWS, ELEVATION 1284 FEET.
0300 PM HIGH SUST WINDS 1 WNW POINT ARGUELLO 34.58N 120.65W
04/12/2018 M41.00 MPH SANTA BARBARA CA C-MAN STATION
SUSTAINED NORTHWEST WINDS OF 41 MPH GUSTING TO 45 MPH AT
POINT ARGUELLO C-MAN STATION, ELEVATION 106 FEET.
0403 PM HIGH SUST WINDS 2 NNE REFUGIO STATE BEA 34.49N 120.05W
04/12/2018 M41.00 MPH SANTA BARBARA CA MESONET
SUSTAINED NORTHWEST WINDS OF 41 MPH AT LAS FLORES CANYON,
ELEVATION 620 FEET.
0424 PM HIGH SUST WINDS 5 N BIG PINE MOUNTAIN 34.77N 119.65W
04/12/2018 M43.00 MPH SANTA BARBARA CA MESONET
SUSTAINED NORTH WINDS AT 43 MPH AT SANTA BARBARA POTRERO,
ELEVATION 5300 FEET.
&&
HALLPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OXNARD CA
622 PM PDT THU APR 12 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0524 PM HIGH SUST WINDS 5 N SANTA BARBARA 34.50N 119.73W
04/12/2018 M44.00 MPH SANTA BARBARA CA MESONET
SUSTAINED WINDS OF 44 MPH AT LA CUMBRE PEAK, ELEVATION
3820 FEET.
0542 PM HIGH SUST WINDS 5 N BIG PINE MOUNTAIN 34.77N 119.65W
04/12/2018 M44.00 MPH SANTA BARBARA CA MESONET
SUSTAINED NORTH WINDS AT 44 MPH AT SANTA BARBARA POTRERO,
ELEVATION 5300 FEET.
0553 PM NON-TSTM WND GST 8 NNE MOUNT WILSON 34.33N 118.03W
04/12/2018 M58.00 MPH LOS ANGELES CA MESONET
NORTH WINDS OF 34 MPH GUSTING TO 58 MPH AT CHILAO RAWS,
ELEVATION 5450 FEET.
0600 PM NON-TSTM WND GST 6 ENE CARPINTERIA 34.42N 119.42W
04/12/2018 M60.00 MPH VENTURA CA MESONET
NORTH WINDS 25 GUSTING TO 60 MPH AT LA GRANADA MOUNTAIN,
ELEVATION 2230 FEET.
&&
HALL2 high wind. Local standard time, as filed.
Strong and gusty northerly winds developed across the mountains of Los Angeles county. Some reports from local RAWS stations include: Chilao (gusting to 58 MPH) and Sandberg (gusting to 60 MPH).
Strong and gusty northerly winds developed across the mountains of Ventura county. The RAWS sensor at La Granada Mountain reported winds gusting to 60 MPH.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2018Every state in 2018This day in weather historyWarnings in California, April 2018
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: 760962, 760963.