California, 2019

Flash Flooding and Heavy Snow in California, January 14 to 17, 2019

January 14 to 17, 2019 · NWS VEF · 6 events in 3 counties and zones

Two back to back Pacific storms produced rain, snow, and fog around the region.

Where it happened

Every event with a place to put it; 3 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

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
$3,000
Crop damage
None recorded
Events
6

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.

Two back to back Pacific storms produced rain, snow, and fog around the region.

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 Jan 14, 2:35 PM PST, 6 hours 25 minutes earlier.

Area forecast discussion, Jan 14, 2:35 PM PST, 6 hours 25 minutes before
Area Forecast Discussion
National Weather Service Las Vegas NV
235 PM PST Mon Jan 14 2019

.SYNOPSIS...Widespread rain and mountain snow in southeast
California will spread east encompassing southern Nevada and
northwest Arizona tonight. There will be breaks in precipitation at
times on Tuesday and Wednesday before another potent system
rolls through late week.
&&

.SHORT TERM...Through Tuesday night.

Rain buckets across the high desert of San Bernardino County
starting to tip. Amounts so far less than a tenth of an inch around
the Morongo Basin and the western Mojave Desert. The only significant
change made with this first system was to increase QPF amounts
across the lower Colorado River Valley and Mohave County through
Tuesday afternoon. Reason for the higher QPF values looks to be
associated with an IVT plume that is able to penetrate eastward into
the lower Colorado River Valley and Mohave County tonight/Tuesday.
Increased QPF values up to 0.50-1.00", 1.00-1.50" in the higher
terrain; like the Hualapai Mtns. Those values may be on the
conservative side. Later shifts will be monitor radar trends
identifying regions where areal flood advisories may be needed.

Elsewhere, trying to stay as consistent as I could but some QPF and
total snow amounts may have fluctuated a bit from the previous
forecast due to slightly higher snow levels across southern Nevada.
Overall, total snow accumulations though support ongoing winter
weather headlines. Only uncertainty swirls around the advisory above
4000 feet in the Owens Valley where snow levels may bring snow
further down into the Owens Valley. Expect precipitation intensities
to decrease late tonight from west-east behind existing shortwave
trough. The exception looks to be Mohave County where secondary
disturbance will aid in additional precipitation through the day
Thursday.

.LONG TERM...Wednesday through Monday.

The next in a series of active weather systems will approach the
coast Wednesday and bring widespread precipitation to parts of
coastal and inland California. The models have been fairly
consistent in showing some weak ridging developing moving across the
Great Basin and southern Mojave Desert as the upper low off the
coast strengthens. Although there may be some scattered showers
around the area on Wednesday, this does not look to be a high qpf
event with most of the precipitation will likely be blocked by the
Sierra. Have contained the trend of lowering pops especially across
the southern and eastern portions of the CWA Wednesday as most of
the shower activity should be limited to the Sierra and far northern
zones.

As the low off the California coast approaches this should help to
tap into some deeper moisture and bringing a significant amount of
precipitation to the southern Sierra and then widespread
precipitation to the remainder of the CWA Thursday and Thursday
night. QPF totals should range around quarter to half an inch over
the northern zones with up to a quarter inch across the south.
Another difference between this system and the early week system is
that snow levels will be higher as some warmer air gets worked into
the area. Snow levels in the Sierra are expected to be around 7000
feet with the remainder of the area seeing snow levels 7500 feet or
higher. Still, areas like Lee Canyon Ski Resort in southern Nevada
could see up to a foot of new snow by Friday morning. Areas above
7500 feet in the Sierra could easily see 1-3' of new snow with this
mid week system.

Models are still hanging on to some moisture across the far eastern
areas of the CWA Friday, but overall weather will start to improve
as high pressure builds in from the west. Dry conditions look to
occur across the entire area Saturday and Sunday with ridging
overhead. However, another but weaker system is shown by the models
to push the ridge east and move across the northern zones Sunday
night and Monday. This could bring precipitation back to the
forecast for the Sierra, Esmeralda, central Nye and Lincoln
Counties. Precipitation amounts look generally light as this
shortwave moves through pretty quick. No significant cold air is
expected across the area during the extended period with
temperatures running just a few degrees above normal.
&&

.AVIATION...For McCarran...Forecast confidence is low through the
next 30 hours. Aviation conditions will continue to deteriorate this
evening as light rain, perhaps periods moderate rain, begin between
01z-03z. Ceilings expected to lower around 3-5 kft with onset of
precip this evening. Winds below 10 knots are expected but shower
activity may dictate speed and direction through Tuesday morning. As
rain vacates Tuesday morning, moistened low levels may result in
MVFR to IFR visibilities and ceilings. Ceiling improvements are
expected between 17z-20z; however, low clouds around 5k feet
expected to hang in through Tuesday evening.

For the rest of southern Nevada, southeast California, and northwest
Arizona...Periods of light to moderate rain is expected at each TAF
site over the next 24 hours. Ceilings will lower with the onset of
precipitation with most ceilings falling to 2-4 kft, localized
moderate to heavy precip may result in CIGs below 1 kft. After the
rain ends, some valley locations may see visibility reductions
Tuesday morning, with MVFR to IFR visibilities -- confidence is low.
Conditions are expected to gradually improve late morning and early
afternoon Tuesday. Winds are expected to be light through Tuesday at
most TAF sites and generally favor a southerly direction outside of
shower influence.
&&

.SPOTTER INFORMATION STATEMENT...A series of winter storms will
impact the region this week. Spotters are encouraged to report
rain/snow amounts according to standard operating procedures.
&&

SHORT TERM...Pierce
AVIATION...Boothe
LONG TERM...Gorelow

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), 147 km away, was scanning. The volume nearest the first event began at 04:57 UTC.

Open the radar archive at this moment

Event by event

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

Flash Flood, Inyo

When
January 14, 9:00 PM PST to 9:30 PM PST
Where
Inyo County, 9.19 mi WNW of Harrisburg to 9.18 mi WNW of Harrisburg
Cause
Heavy Rain
Property damage
$1,000
Reported by
Law Enforcement
Coordinates
36.398, -117.281

Heavy rain washed a boulder the size of a vehicle onto Highway 190 at Towne Pass.

Dense Fog, Morongo Basin

When
January 14, 10:02 PM PST to January 15, 8:00 AM PST
Where
Morongo Basin forecast zone
Reported by
Trained Spotter
Coordinates
34.841, -116.178 (the zone’s center; the record gives no point)

Dense fog reduced visibility to less than a quarter mile in Yucca Mesa and along Highway 62 in the Morongo Basin.

Dense Fog, Morongo Basin

When
January 16, 9:00 AM PST to 11:00 AM PST
Where
Morongo Basin forecast zone
Reported by
Trained Spotter
Coordinates
34.841, -116.178 (the zone’s center; the record gives no point)

Dense fog reduced visibility to about 80 feet in Yucca Valley and Morongo Valley.

Heavy Snow, Eastern Sierra Slopes of Inyo County

When
January 16, 5:00 PM PST to January 17, 5:00 PM PST
Where
Eastern Sierra Slopes of Inyo County forecast zone
Reported by
Trained Spotter
Coordinates
36.511, -117.411 (the zone’s center; the record gives no point)

Twenty inches of snow fell in Aspendell.

Flash Flood, Inyo

When
January 17, 6:10 AM PST to 7:00 AM PST
Where
Inyo County, 3.07 mi SSE of Keeler to 5.42 mi SE of Keeler
Cause
Heavy Rain
Property damage
$1,000
Reported by
Law Enforcement
Coordinates
36.440, -117.847

The intersection of Highway 190 and Highway 136 was flooded and briefly closed.

Flash Flood, Inyo

When
January 17, 6:51 AM PST to 8:30 AM PST
Where
Inyo County, 0.86 mi WNW of Olancha to 0.42 mi NW of Olancha
Cause
Heavy Rain
Property damage
$1,000
Reported by
Law Enforcement
Coordinates
36.287, -118.013

Highway 395 was flooded at Olancha.

What these are

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.
Dense Fog
Fog reducing visibility to a quarter mile or less, filed where it caused accidents or disruption.
Heavy Snow
Snowfall reaching the local warning threshold without the other hazards of a winter storm.

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, January 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: 793714, 793715, 793716, 793717, 793718, 793719.