California, 2019

Flash Flooding and Dense Fog in California, February 2, 2019

February 2, 2019 · NWS VEF · 3 events in 3 counties and zones

A strong Pacific storm brought locally heavy rain and isolated flash flooding to southeast California.

Where it happened

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.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
1
Injuries
0
Property damage
$102,000
Crop damage
None recorded
Events
3

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.

What happened

The episode as NWS VEF wrote it up.

A strong Pacific storm brought locally heavy rain and isolated flash flooding to southeast California.

What forecasters said that day

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 Las Vegas, NV wrote its last area forecast discussion before the first event at Feb 2, 4:07 AM PST, 2 hours 43 minutes earlier.

Area forecast discussion, Feb 2, 4:07 AM PST, 2 hours 43 minutes before
Area Forecast Discussion
National Weather Service Las Vegas NV
407 AM PST Sat Feb 2 2019

.SYNOPSIS...A potent Pacific Storm moving inland today and
tonight will bring significant mountain snow, widespread rainfall
and gusty winds to our area. A brief lull will occur Sunday before a
colder system with less moisture slowly drops down from the north
and produces gusty winds and additional chances for showers through
mid-week.
&&

.SHORT TERM...Today and tonight.

A wide swath of moisture ahead of a closed upper low circulating off
the California Coast was spreading inland this morning and our
forecast area still looks to be in a favorable position to receive
widespread rain, gusty winds and heavy snow in the mountains above
7500 feet. Snow has already been falling in the Southern Sierra
since before midnight and recent radar loops showed light rain
across much of Inyo and San Bernardino counties. Areas of light rain
will continue spreading across southern Nevada this morning, but
there will be some breaks today ahead of the main event late this
afternoon and evening. This will be a concentrated band of
precipitation just ahead of the baroclinic zone associated with the
closed low which will spread across southeast California between 18Z
and 00Z then over southern Nevada between 00Z and 06Z this evening
before moving into Northwest Arizona late this evening through early
Sunday morning. This should produce about a 4-6 hour window of
continuous moderate rainfall with pockets of brief heavy rain.
Models have trended a little slower with this and the PoP/WX/QPF
grids were adjusted accordingly. It still appears general rainfall
amounts of 0.25-0.75 inches can be expected for the valleys and
deserts.

Strong south-southwest winds associated with the baroclinic zone
will likely produce enhanced orographic precip and storm total
amounts were raised over the Spring Mountains. Snow levels over
Southern Nevada will generally hold above 8000 feet much of today
then will drop to around 6000 feet between 6 PM and 10 PM PST this
evening just as the deep moisture plume begins to move into
Northwest Arizona. The town of Mt. Charleston will likely mainly see
rain or a rain/snow mix and not much snow accumulation until this
evening when snow levels drop and snowfall rates of 2-3 inches per
hour will be possible. Lee Canyon and higher elevations are still on
track to see at least 1-2 feet of new snow...and likely 3 feet at
Charleston Peak. No change was made to the Winter Storm Warnings in
effect for the mountains of Inyo County California and Southern
Nevada.

.LONG TERM...Sunday through Friday.

Low pressure rapidly weakens and moves east of the area Sunday. This
will give us a brief break between systems. Look for less cloud
cover and showers tied mainly to the Sierra, portions of Lincoln
County and northern Mohave County. Winds should be primarily tied to
any shower activity that develops but otherwise light northwesterly.
Temperatures should rebound a few degrees to around normal.

The next system will be on its way Monday, barreling down along the
west coast to near Monterey, CA by Tuesday afternoon. Strengthening
gradients will lead to gusty south winds developing across much of
the area Tuesday afternoon. The best chances for shower activity
Monday will generally be tied to the Sierra and southern Nevada as
expanding into Mohave County in northwest Arizona on Tuesday. Higher
precip amounts are expected to be higher in the Sierra on Monday due
to increasing jet dynamics as it rounds the base of the approaching
low pressure system. Lighter amounts are forecast for Tuesday and
Wednesday with more showery type precipitation expected as the low
moves through the area.

Improving conditions on Thursday as the system moves east followed
by dry west to southwest flow on Friday.

Temperatures start out near normal Sunday and Monday, drop off a
couple of degrees Tuesday and end up around 10 degrees below normal
Wed-Fri. Morning lows will approach the freezing mark in Las Vegas
by Thursday morning.

&&

.AVIATION...For McCarran...Deteriorating weather conditions expected
today with increasing shower activity and lowering CIGs. In
addition, periods of gusty southeast winds with gusts over 25 knots
are likely during the day, shifting to the southwest late tonight.
Rainfall should be light and sporadic during the day, with steady
light to moderate rain moving in after sunset this evening, tapering
off around midnight. Ceilings in the 4-8k range are expected, though
they may drop below 3k during heavy precipitation.  Gusty southwest
winds are possible following the rainfall lasting into Sunday
morning.

For the rest of southern Nevada, northwest Arizona and southeast
California...Deteriorating weather conditions are expected area wide
today as a moist Pacific weather system moves through. Widespread
shower activity and south winds gusting to 30 knots or more are
possible, with moderate rain moving through during the afternoon and
evening hours. Low CIGs of 3-6k are likely along with mountain
obscurations and low level turbulence.
&&

.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather or impacts according to standard operating
procedures.
&&

SHORT TERM...Adair
LONG TERM...Salmen
AVIATION...Outler

For more forecast information...see us on our webpage:

http://weather.gov/lasvegas or follow us on Facebook and Twitter

The radar

The Edwards AFB radar (KEYX), 129 km away, was scanning. The volume nearest the first event began at 00:02 UTC.

Open the radar archive at this moment

Event by event

2 flash flood, 1 dense fog. Local standard time, as filed.

Dense Fog, Cadiz Basin

When
February 2, 6:50 AM PST to 9:30 AM PST
Where
Cadiz Basin forecast zone
Reported by
Law Enforcement
Coordinates
34.841, -116.178 (the zone’s center; the record gives no point)

Dense fog reduced visibility to 250 feet or less in Yucca Valley and Morongo Valley.

Flash Flood, Inyo

When
February 2, 4:05 PM PST to 6:00 PM PST
Where
Inyo County, 9.37 mi WNW of Harrisburg to 9.36 mi WNW of Harrisburg
Cause
Heavy Rain
Property damage
$2,000
Reported by
Law Enforcement
Coordinates
36.408, -117.282

Flooding and debris on Highway 190 at Towne Pass caused several vehicles to get stuck.

Flash Flood, San Bernardino

When
February 2, 4:41 PM PST to 9:00 PM PST
Where
San Bernardino County, 4.19 mi SE of Joshua Tree Arpt to 6.85 mi SSW of Yucca Vly
Cause
Heavy Rain
Deaths
1 direct, 0 indirect
Property damage
$100,000
Reported by
Law Enforcement
Coordinates
34.106, -116.199

Numerous roads and intersections were flooded in Yucca Valley and Joshua Tree, at least four homes were flooded, at least four vehicles were stranded, and at least six swift water rescues occurred. One man was killed when his vehicle was swept away by flood waters.

The people who died

As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.

EventDateAgeSexWhereKind
Flash Flood, San Bernardino2019-02-0276MaleVehicle/Towed TrailerDirect

What these are

Dense Fog
Fog reducing visibility to a quarter mile or less, filed where it caused accidents or disruption.
Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in California in 2019Every state in 2019This day in weather historyWarnings in California, February 2019

Sources

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: 805384, 805385, 805386.