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ACUS41 KWBC 150900

SCCNS1



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

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