Storm Summary Number 2 for Heavy Rain and Wind in California
NWS Weather Prediction Center College Park MD
800 AM PDT Mon Oct 25 2021

...Heavy rainfall, high elevation mountain snow, and gusty winds
continue across California...

Flash Flood Warnings are in effect for burn scars and upslope
portions of the Sierra Nevada in northern and central California.

Flood Warnings are in effect for upslope portions of the southern
Sierra Nevada.

Winter Storm Warnings are in effect for the Sierra Nevada.

Flood Advisories are in effect for portions of the Sacramento and
San Joaquin Valleys of California as well as the central
California coast.

Flash Flood Watches are in effect for portions of central and
southern California.

For a detailed graphical depiction of the latest watches, warnings
and advisories, please see www.weather.gov

At 700 AM PDT...A low pressure system with a central pressure of
964 mb, or 28.47 in/Hg, was analyzed west of Vancouver Island in
British Colombia, at approximately 48.5 north, 128.5 west. An
occluded front wrapped around the system through central British
Columbia and western Alberta, with a meandering cold/stationary
front draped southwest across the Northern Rockies, northern Great
Basin, and through northern and central California. National
Weather Service Doppler radar indicated a broad area of moderate
to heavy rainfall continuing along and south of this cold front
across northern and central California, roughly from the Lake
Tahoe region southward through the San Joaqiun Valley to the coast
at Big Sur and through the Southern Coast Ranges. In addition,
heavy snowfall was occurring at higher elevations in the Sierra
Nevada.

...Selected preliminary Storm Total Snowfall in inches from 900 PM
PDT Sat Oct 23 through 700 AM PDT Mon Oct 25...

...CALIFORNIA...
TRUCKEE 1.6 N                        15.0                    
SOUTH LAKE TAHOE 4.9 SW               4.0                    
ALTURAS 9.5 E                         2.1                    

...NEVADA...
RENO 17.8 NNW                         5.9                    

...Selected preliminary Storm Total Rainfall in inches from 900 PM
PDT Sat Oct 23 through 700 AM PDT Mon Oct 25...

...CALIFORNIA...
FOUR TREES NEAR PARADISE             9.92                    
STRAWBERRY VALLEY                    9.89                    
SANTA ROSA                           9.43                    
DOTY RAVINE                          8.74                    
SODA CREEK                           8.61                    
WHITE CLOUD                          8.29                    
VACAVILLE                            8.18                    
COBB 2 NNW                           8.03                    
REDWOOD VALLEY 2.9 NNE               7.37                    
SHASTA                               6.43                    
SUSANVILLE 3.2 SSW                   6.01                    
MANCHESTER 2 SSW                     5.95                    
OAKLAND NORTH                        5.21                    
SACRAMENTO MATHER AIRPORT            5.20                    
GRIDLEY 3.3 SE                       5.17                    
SAN FRANCISCO INTERNATIONAL AIRPORT  3.21                    
REDDING MUNICIPAL AIRPORT            3.03                    

...Selected preliminary Peak Wind gusts in miles per hour earlier
in the event...

...CALIFORNIA...
MINES TOWER                            92                    
LOMA PRIETA                            88                    
RICHARDSON EAST                        86                    
SOUTHERN BLACK DIAMOND WAY             77                    
ANGWIN                                 72                    
MT ST HELENA                           70                    
SHIP MOUNTAIN RAWS                     67                    
KNEELAND RAWS                          65                    
SANTA RITA                             62                    
BOLAM                                  61                    
OLD COAST TOWER                        61                    
SAN FRANCISCO INTERNATIONAL AIRPORT    60                    
PEBBLE BEACH                           55                    
SANTA CRUZ 2.4 SW                      50                    
MONTEREY                               45                    
OAKLAND AIRPORT                        45                    

...OREGON...
YAQUINA BAY BRIDGE                     82                    
CAPE FALCON 1 SSE                      80                    
SQUAW PEAK                             75                    
CLASTOP SPIT                           74                    
PORT ORFORD 5 SE                       73                    
PORT ORFORD 5.0 SE                     73                    
ONION MOUNTAIN LOOKOUT                 69                    
VALLEY FALLS 9.4 N                     68                    
KLAMATH FALLS KINGSLEY FIELD           54                    

...WASHINGTON...
CAPE DISAPPOINTMENT 2 ENE              74                    
TOKE POINT                             64                    
CORRAL CREEK                           51                    
MISSION CREEK                          48                    
IRON MOUNTAIN                          44                    


The low pressure center will continue to weaken as it moves slowly
northeast while the cold front will continue southward through
Southern California Monday. Heavy rain will continue to move
southward through the state along the front through Monday evening
as heavy snow continues for higher elevations of the Sierra
Nevada. A Slight Risk of Excessive Rainfall is in effect along the
windward side of the Sierra Nevada on the eastern edge of the San
Joaquin Valley where an additional 3" + of rainfall is possible. A
Marginal Risk is in effect for a broader portion of the San
Joaquin Valley as well as Big Sur and the Southern Coast Ranges
for an additional couple inches of rain. Flash flooding will
remain a concern specifically for burn scars. Winter Storm
Warnings remain in effect for higher elevations of the Sierra
Nevada through this evening, where totals locally could exceed
several feet. 

The next Storm Summary will be issued by the Weather Prediction
Center at 800 PM PDT. Please refer to your local National Weather
Service office for additional information on this event.

Putnam