Debris Flow in California, January 10, 2005

Name: Debris Flow in California, January 10, 2005
Start: 2005-01-10T19:49
End: 2005-01-10T21:26
Location: California

January 10, 2005 · NWS SGX · 1 event in 1 county or zone

Large boulders fell on many roads and highways in Crestline, Running Springs, and Big Bear.

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

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $20,000
Crop damage: None recorded
Events: 1

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 SGX wrote it up.

Large boulders fell on many roads and highways in Crestline, Running Springs, and Big Bear.

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 San Diego, CA wrote its last area forecast discussion before the first event at Jan 10, 9:30 AM PST, 10 hours 19 minutes earlier.

Area forecast discussion, Jan 10, 9:30 AM PST, 10 hours 19 minutes before

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Hazardous weather outlook, Jan 10, 3:00 PM PST, 4 hours 49 minutes before

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In the hours before

Local storm report, Jan 10, 3:29 PM PST, 4 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
329 PM PST MON JAN 10 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 PM     FLASH FLOOD      PALM SPRINGS            33.83N 116.54W
01/09/2005                   RIVERSIDE          CA   BROADCAST MEDIA

            3 SWIFT WATER RESCUES IN THE COACHELLA VALLEY SUNDAY
            NIGHT.

1252 PM     FLOOD            SAN BERNARDINO          34.14N 117.29W
01/10/2005                   SAN BERNARDINO     CA   TRAINED SPOTTER

            STREET FLOODING

0130 PM     FLOOD            FULLERTON               33.88N 117.93W
01/10/2005                   ORANGE             CA   TRAINED SPOTTER

            STREET FLOODING.

0308 PM     FLOOD            LAKE ELSINORE           33.67N 117.32W
01/10/2005                   RIVERSIDE          CA   TRAINED SPOTTER

            STREET FLOODING ALONG COLLIER AVENUE WEST OF I-15. 8 TO
            12 INCHES OF WATER IS ON THE ROAD.

&&

BM

Local storm report, Jan 10, 7:34 PM PST, 15 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SAN DIEGO CA
734 PM PST MON JAN 10 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1252 PM     FLOOD            SAN BERNARDINO          34.14N 117.29W
01/10/2005                   SAN BERNARDINO     CA   TRAINED SPOTTER

            STREET FLOODING

0130 PM     FLOOD            FULLERTON               33.88N 117.93W
01/10/2005                   ORANGE             CA   TRAINED SPOTTER

            STREET FLOODING.

0135 PM     FLASH FLOOD      MORONGO VALLEY          34.06N 116.59W
01/10/2005                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            MUD AND DEBRIS CROSSING ROADWAY AT HWY 62 AND EAST.

0256 PM     FLASH FLOOD      W CRESTLINE             34.25N 117.30W
01/10/2005                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            ROCKS AND TREES ON ROAD AT SR138 AND CRESTLINE RD.

0308 PM     FLOOD            LAKE ELSINORE           33.67N 117.32W
01/10/2005                   RIVERSIDE          CA   TRAINED SPOTTER

            STREET FLOODING ALONG COLLIER AVENUE WEST OF I-15. 8 TO
            12 INCHES OF WATER IS ON THE ROAD.

0449 PM     FLASH FLOOD      CRESTLINE               34.25N 117.30W
01/10/2005                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            BOWL RD FLOODING AND ROAD IS STARTING TO COLLAPSE

0551 PM     FLASH FLOOD      LAKE ARROWHEAD          34.26N 117.19W
01/10/2005                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            CREEK JUMPED ITS BED AND IS RUNNING ACROSS ROADWAY AT
            SR173 AND JOHN MUIR RD

0601 PM     FLASH FLOOD      9 SE CORONA             33.78N 117.46W
01/10/2005                   RIVERSIDE          CA   LAW ENFORCEMENT

            SPANISH HILLS DR AT PARK CANYON RD WASHED OUT. ABOUT A 2
            FT CANYON DOWN THE MIDDLE OF THE ROAD

0624 PM     FLASH FLOOD      3 NW LAKE ARROWHEAD     34.29N 117.23W
01/10/2005                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            MUD/ROCK SLIDE BLOCKING LANES AT SR189 AND GRASS VALLEY
            RD

0625 PM     FLASH FLOOD      5 E MISSION VIEJO       33.61N 117.57W
01/10/2005                   ORANGE             CA   LAW ENFORCEMENT

            BOULDERS ACROSS ORTEGO HWY JUST WEST OF NICHOLS

&&

BND

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 debris flow. Local standard time, as filed.

Debris Flow, P Sw San Bernardino

When: January 10, 7:49 PM PST to 9:26 PM PST
Where: P Sw San Bernardino forecast zone
Property damage: $20,000
Reported by: LAW ENFORCEMENT
Coordinates: 34.841, -116.178 (the zone’s center; the record gives no point)

What these are

Debris Flow: A fast-moving slurry of mud, rock and debris, usually on a slope soaked by heavy rain or stripped by a fire.

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

The same day elsewhere

Every storm in California in 2005 Every state in 2005 This day in weather history Warnings in California, January 2005

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 2026-09-30. Each event’s entry at NCEI: 5436683.