April 2018 began with high pressure over the region which kept a dry airmass and much warmer than normal temperatures over the area. An upper trough off the Pacific Northwest coast pulled a deep plume of tropical moisture northward and brought periods of moderate to heavy precipitation to the area from the late evening of April 6 through the afternoon of April 7. This system was unusually warm for early April and snow levels were above 11000 feet for most of the duration of this event. Several stations over the higher elevations of the Southern Sierra Nevada measured between 2 and 3 inches of rain which resulted in accelerated snow melt and rapid runoff into the rivers over the higher elevations. River flooding was reported along the Merced River above New Exchequer Dam and several roads in Yosemite National Park were closed as a result. In addition there were reports of minor roadway flooding and rock slides in the Southern Sierra Foothills near Mariposa and over the higher Sierras south of Yosemite Park. Flooding was also reported in the Merced area and near Livingston during the morning of April 7. This storm also produced strong wind gusts over the Kern County Mountains and Deserts with several indicator sites reporting wind gusts above 60 mph.

Flood in MERCED, CALIFORNIA
From 07-APR-18 06:00:00 to 07-APR-18 09:00:00 (PST-8)
Location: ARENA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported the intersection of Liberty Ave. and Cressley Way was completely flooded.

Heavy Rain in MARIPOSA, CALIFORNIA
From 07-APR-18 02:30:00 to 07-APR-18 06:34:00 (PST-8)
Location: CATHEYS VLY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 0.87 inches of rainfall in the previous 4 hours and 1.49 inches of rainfall in the previous 24 hours.

Debris Flow in FRESNO, CALIFORNIA
From 07-APR-18 06:40:00 to 07-APR-18 06:40:00 (PST-8)
Location: HUNTINGTON LAKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported 3 separate rock slides on Tollhouse Rd. southeast of Huntington Lake.

Flood in MARIPOSA, CALIFORNIA
From 07-APR-18 06:41:00 to 08-APR-18 13:33:00 (PST-8)
Location: FORESTA
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Merced River at Pohono Bridge exceeded it's food state of 10 feet between the morning of April 7 and the afternoon of April 8. It crested at 13.7 feet during the afternoon of April 7. The flooding closed Northside Drive and Southside Drive in Yosemite Valley which are the main roads in the valley.

High Wind in TULARE CTY MTNS, CALIFORNIA
From 06-APR-18 14:10:00 to 06-APR-18 14:10:00 (PST-8)
Magnitude: 66.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The Bear Peak RAWS reported a peak wind gust of 76 mph.

High Wind in KERN CTY MTNS, CALIFORNIA
From 08-APR-18 00:27:00 to 08-APR-18 00:27:00 (PST-8)
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The Bird Springs Pass RAWS reported a peak wind gust of 72 mph.

High Wind in KERN CTY MTNS, CALIFORNIA
From 07-APR-18 14:32:00 to 07-APR-18 14:32:00 (PST-8)
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The Blue Max RAWS reported a peak wind gust of 66 mph.

High Wind in KERN CTY MTNS, CALIFORNIA
From 05-APR-18 23:14:00 to 05-APR-18 23:14:00 (PST-8)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The Jawbone Canyon RAWS reported a peak wind gust of 65 mph.

High Wind in INDIAN WELLS VLY, CALIFORNIA
From 05-APR-18 23:26:00 to 05-APR-18 23:26:00 (PST-8)
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The Indian Wells Canyon RAWS reported a peak wind gust of 61 mph.

High Wind in SE KERN CTY DESERT, CALIFORNIA
From 06-APR-18 01:00:00 to 06-APR-18 01:00:00 (PST-8)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Mojave Airport AWOS reported a peak wind gust of 59 mph.