STORM SUMMARY NUMBER 1 FOR WEST COAST ATMOSPHERIC RIVER AND HEAVY
RAIN
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
200 PM PDT FRI APR 06 2018

...HEAVY RAIN IS FALLING ACROSS NORTHERN CALIFORNIA AS AN
ATMOSPHERIC RIVER PROVIDES RECORD-BREAKING MOISTURE...

FLOOD WATCHES ARE IN EFFECT FOR MUCH OF NORTHERN AND CENTRAL
CALIFORNIA.

FOR A DETAILED GRAPHICAL DEPICTION OF THE LATEST
WATCHES...WARNINGS AND ADVISORIES...PLEASE SEE WWW.WEATHER.GOV

AT 100 PM PDT...A BROAD ATMOSPHERIC RIVER WAS PROVIDING HIGH TO
RECORD-BREAKING AMOUNTS OF MOISTURE TO CALIFORNIA AND SOUTHERN
OREGON. AT THE SURFACE...A STATIONARY FRONT STRETCHED INTO
NORTHERN CALIFORNIA FROM THE PACIFIC. NATIONAL WEATHER SERVICE
DOPPLER RADARS AND SURFACE OBSERVATIONS INDICATED THAT A BROAD
AREA OF MODERATE TO HEAVY RAIN WAS LOCATED ACROSS NORTHERN AND
CENTRAL CALIFORNIA AND WESTERN NEVADA. LIGHT TO MODERATE RAIN WAS
FALLING IN SOUTHERN OREGON AND NORTH CENTRAL NEVADA.

...SELECTED PRELIMINARY STORM TOTAL RAINFALL IN INCHES FROM 100 AM
PDT THU APR 05 THROUGH 100 PM PDT FRI APR 06...

...CALIFORNIA...
VENADO                                4.20                    
LEGGETT                               4.00                    
SEBASTOPOL                            3.55                    
SODA CREEK                            3.52                    
DILLON BEACH                          3.50                    
MENDOCINO PASS                        3.41                    
RUTH                                  3.03                    
HIGH GLADE LOOKOUT                    2.91                    
MAGALIA                               2.67                    
UKIAH MUNI ARPT                       2.54                    
SANTA ROSA SONOMA CO ARPT             2.19                    

...OREGON...
BROOKINGS ARPT                        1.92                    


HIGH AMOUNTS OF MOISTURE WILL REMAIN ACROSS THE WEST COAST ON
FRIDAY AND FRIDAY NIGHT...SO HEAVY RAIN WILL CONTINUE. THUS A
MODERATE RISK OF EXCESSIVE RAINFALL REMAINS IN EFFECT FOR PORTIONS
OF THE CALIFORNIA COAST THROUGH FRIDAY...WITH A SLIGHT RISK OVER
MUCH OF THE NORTHERN HALF OF CALIFORNIA. ADDITIONAL RAINFALL
TOTALS OF 1 TO 3 INCHES ARE POSSIBLE ALONG THE NORTHERN CALIFORNIA
COAST FRIDAY NIGHT...WITH 2 TO 4 INCHES POSSIBLE IN THE SIERRA
MOUNTAINS THROUGH SATURDAY MORNING. ON SATURDAY...A STRONG LOW
PRESSURE SYSTEM WILL MOVE EASTWARD ACROSS THE PACIFIC TOWARD
BRITISH COLUMBIA. THIS WILL BOTH INCREASE THE RAINFALL POTENTIAL
FARTHER NORTH IN THE PACIFIC NORTHWEST AND DECREASE THE THREAT FOR
HEAVY RAIN IN CALIFORNIA AS THE COLD FRONT ASSOCIATED WITH THE LOW
WILL SWEEP OUT THE HIGH MOISTURE. IN THE PACIFIC NORTHWEST...2 TO
4 INCHES OF RAIN IS FORECAST IN THE HIGHER ELEVATIONS THROUGH
SUNDAY.

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.

TATE