Storm Summary Number 1 for California Atmospheric River
NWS Weather Prediction Center College Park MD
200 AM PDT Tue Mar 14 2023

...Heavy rainfall to continue this morning across Central and
Southern California...

Scattered Flood Warnings are in effect in the Sacramento Valley
through Southern California.

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

At 100 AM PDT...Radar imagery and surface observations highlight
widespread showers and thunderstorms across Central and Southern
California, pressing south ahead of a Pacific cold front bisecting
California. The heaviest of this activity was generally focused
along the Sierra Madre and San Gabriel Mountains where the most
favorable orographic lift was occuring.

...Selected preliminary Storm Total Snowfall in inches from 700 AM
PDT Mon Mar 13 through 100 AM PDT Wed Mar 15...

...CALIFORNIA...
PINECREST 2 E                        18.0                    
SODA SPRINGS 3 S                     13.6                    

...Selected preliminary Storm Total Rainfall in inches from 700 AM
PDT Mon Mar 13 through 100 AM PDT Wed Mar 15...

...CALIFORNIA...
SHASTA DAM                           8.12                    
MINING RIDGE                         6.93                    
SQUAW VALLEY 2.5 W                   6.70                    
THREE PEAKS                          6.66                    
STIRLING CITY                        5.81                    
ROCKY BUTTE                          5.59                    
GIANT FOREST                         5.58                    
VENADO                               5.10                    
COOSKIE MOUNTAIN                     4.67                    
BEN LOMOND                           4.39                    
KYTD RADIO TOWERS                    4.02                    
LAX                                  1.95                    
SAN FRANCISCO INTL AIRPORT           0.72                    

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

...CALIFORNIA...
LEXINGTON HILLS 5 ESE                  97                    
MINES TOWER                            93                    
LUCAS VALLEY 2 NW                      90                    


The most significant heavy rainfall threat is expected to persist
through this morning, before the Pacific cold front sweeps the
bulk of the atmospheric river plume eastward into the Great Basin
today. Until then, however, locally significant flooding impacts
are possible over the Sierra Nevada foothills, LA metro, and
coastal Southern California given the degree of soil saturation
from earlier rainfall. Accordingly, a Moderate Risk of Excessive
Rainfall is in effect until 5 AM PDT for the aforementioned areas.

The next Storm Summary will be issued by the Weather Prediction
Center at 200 PM PDT. Please refer to your local National Weather
Service office for additional information on this event.

Asherman