A powerful winter storm impacted Central and Southern California with heavy rain and snow, gusty winds and widespread urban flooding. The heaviest rainfall totals (4-10 inches) fell across San Luis Obispo and Santa Barbara counties due to the influence of an atmospheric river. With such rainfall totals, numerous reports of flooding were received in these areas. Across Ventura and Los Angeles counties, rainfall totals were less, but still significant. Ventura county received 2 to 6 inches of rainfall with 1-4 inches across Los Angeles county. With snow levels around 5000 feet, significant snowfall fell in the mountains of Ventura and Los Angeles counties with 1 to 2 feet of snowfall reported. Along with the precipitation, southerly winds, gusting up to 80 MPH, impacted the area.

Winter Storm in LOS ANGELES COUNTY MOUNTAINS EXCLUDING THE SANTA MONICA RANGE, CALIFORNIA
From 27-JAN-21 06:00:00 to 29-JAN-21 12:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter storm conditions impacted the mountains of Los Angeles county. Snowfall totals of 1 to 2 feet above 5000 feet were reported. The snow combined with southerly winds, gusting to 70 MPH, to generate hazardous winter weather conditions.

Winter Storm in SANTA BARBARA COUNTY MOUNTAINS, CALIFORNIA
From 27-JAN-21 06:00:00 to 29-JAN-21 12:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Unknown

Winter storm conditions impacted the mountains of Santa Barbara county. Snowfall totals of 4 to 8 inches (above 5000 feet) and southerly winds, gusting to 70 MPH, produced hazardous winter weather conditions.

Winter Storm in VENTURA COUNTY MOUNTAINS, CALIFORNIA
From 27-JAN-21 06:00:00 to 29-JAN-21 12:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter storm conditions impacted the mountains of Ventura county. Snowfall totals around 12 inches were reported at 5000 feet. The snow combined with southerly winds, gusting to 70 MPH, to generate hazardous winter weather conditions.

High Wind in SAN LUIS OBISPO COUNTY CENTRAL COAST, CALIFORNIA
From 27-JAN-21 06:40:00 to 27-JAN-21 12:00:00 (PST-8)
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong and gusty southerly winds impacted the coastal areas of San Luis Obispo county. Some peak wind reports from the local Mesonet include: TV Towers (gust 73 MPH) and High School Hill (gust 62 MPH).

High Wind in SAN LUIS OBISPO COUNTY INTERIOR VALLEYS, CALIFORNIA
From 27-JAN-21 08:10:00 to 27-JAN-21 12:00:00 (PST-8)
Magnitude: 69.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong and gusty southerly winds impacted the interior valleys of San Luis Obispo county. Some peak wind reports from the local Mesonet include: Lewis Ranch Road (gust 79 MPH), Navajo Flats (gust 70 MPH) and Cholame (gust 66 MPH).

High Wind in CUYAMA VALLEY, CALIFORNIA
From 27-JAN-21 09:43:00 to 27-JAN-21 12:00:00 (PST-8)
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong and gusty southerly winds impacted the Cuyama Valley in Santa Barbara county. The sensor at Cuyama reported a peak wind gust of 62 MPH.

High Wind in SAN LUIS OBISPO COUNTY MOUNTAINS, CALIFORNIA
From 27-JAN-21 08:00:00 to 27-JAN-21 12:00:00 (PST-8)
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong and gusty southerly winds impacted the mountains of San Luis Obispo county. Some peak wind reports from the local Mesonet include: Friis (gust 70 MPH) and Mount Lowe (gust 62 MPH).

Flash Flood in SAN LUIS OBISPO, CALIFORNIA
From 28-JAN-21 01:00:00 to 28-JAN-21 03:00:00 (PST-8)
Location: CANBRIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain produced flash flooding in the community of Cambria in San Luis Obispo county. Along Sherwood Drive, several homes were inundated with water and mud, due to the heavy rain.

Flash Flood in SAN LUIS OBISPO, CALIFORNIA
From 28-JAN-21 12:38:00 to 28-JAN-21 14:00:00 (PST-8)
Location: SYCAMORE SPGS
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain fell over the Avila Fire burn scar, producing a mud and debris flow. The northbound lanes of Highway 101 were closed due to mud and debris from the burn scar.

Flash Flood in SAN LUIS OBISPO, CALIFORNIA
From 28-JAN-21 09:00:00 to 28-JAN-21 12:00:00 (PST-8)
Location: CAMBRIA PINES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain produced significant urban flooding in the community of Cambria. Along Windsor Boulevard, a vehicle was stuck with flooding impacted the roadway. The motorist was rescued.