STORM SUMMARY NUMBER 4 FOR SOUTHERN CALIFORNIA HEAVY RAINFALL EVENT
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
100 AM PST SAT FEB 18 2017

...STORM CENTER MOVING INTO SAN FRANCISCO BAY AS HEAVY RAIN SHOWS
SIGNS OF DIMINISHING OVER SOUTHERN CALIFORNIA... 

FLASH FLOOD WATCHES...AND FLOOD WARNINGS AND ADVISORIES EXTEND
FROM MUCH OF NORTHERN CALIFORNIA...ALONG THE LOWER ELEVATIONS OF
THE SIERRA NEVADA...ACROSS SOUTHEASTERN CALIFORNIA AND INTO
CENTRAL ARIZONA.

WINTER STORM WARNINGS...WATCHES...AND WINTER WEATHER ADVISORIES
ARE IN EFFECT ACROSS THE SIERRA NEVADA RANGE OF
CALIFORNIA...TRANSVERSE RANGES IN SOUTHERN CALIFORNIA...AND OVER
THE HIGH TERRAIN OF CENTRAL AND SOUTHERN NEVADA AS WELL AS CENTRAL
ARIZONA.

HIGH WIND WARNINGS...WATCHES...AND WIND ADVISORIES REMAIN IN
EFFECT FROM THE SACRAMENTO VALLEY SOUTHWARD INTO MUCH OF SOUTHERN
CALIFORNIA AND SOUTHERN ARIZONA.

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

AT 1200 AM PST...A DEEP LOW PRESSURE SYSTEM WITH AN ESTIMATED
CENTRAL PRESSURE OF 991 MB...29.25 INCHES WAS DRIFTING EASTWARD
INTO SAN FRANCISCO BAY AS IT CONTINUES TO FETCH ANOMALOUS AMOUNTS
OF MOISTURE INTO CALIFORNIA. NATIONAL WEATHER SERVICE DOPPLER
RADARS AND SURFACE OBSERVATIONS INDICATED THE RAIN SHIELD AHEAD OF
THE LOW PRESSURE SYSTEM OVER NORTHERN AND CENTRAL CALIFORNIA HAD
BECOME MORE SCATTERED AND LESS INTENSE DURING THE PAST FEW HOURS
AS THE STORM BEGAN TO WEAKEN WHILE MOVING ONSHORE NEAR SAN
FRANCISCO.  MEANWHILE...RAIN REMAINED WIDESPREAD ACROSS SOUTHERN
CALIFORNIA AHEAD OF A COLD FRONT AND HAD GRADUALLY BECOME LESS
INTENSE IN THE PAST FEW HOURS AS WELL.  AT THE HIGHER
ELEVATIONS...PRECIPITATION WAS IN THE FORM OF SNOW ALONG THE
SIERRA NEVADA AS WELL AS THE TRANSVERSE RANGES.

...SELECTED STORM TOTAL RAINFALL IN INCHES FROM 1200 AM PST FRI
FEB 17 THROUGH 100 AM PST SAT FEB 18...

...CALIFORNIA...
EL DESEO RANCH                       10.10                    
MATILIJA CANYN UPPER                  9.36                    
OLD AMN MOUNTAIN                      9.09                    
GIBRALTA DAM                          9.07                    
SAN MARCOS PASS                       9.06                    
SULPHUR MOUNTAIN CREEK                6.51                    
ALISAL RESERVOIR                      5.05                    
CELITE                                4.93                    
LAKE CACHUMA                          4.55                    
SANTA BARBARA MUNI ARPT               4.20                    
GOLETA WATER DISTRICT                 4.03                    
SANDBERG                              3.89                    
SANTA BARBARA CITY COLLEGE            3.73                    
SANTA BARBARA FLOOD CONTROL OFFICE    3.42                    
MINING RIDGE                          3.39                    
THREE PEAKS                           3.36                    
OXNARD AIRPORT                        3.26                    
VAN NUYS AIRPORT                      3.25                    
CASITAS                               3.06                    
SPANISH HILLS                         3.04                    
SUMMERLAND                            3.01                    
TOPA TOPA                             2.96                    
CAMARILLO AIRPORT                     2.78                    
ROCKY BUTTE                           2.76                    
LONG BEACH AIRPORT                    2.75                    
DOUGH FLAT                            2.54                    
ROLLING HILLS                         2.45                    
LOS OSOS NORTH LANDFILL               2.29                    
VANDENBERG AFB/LOMPOC                 2.21                    
SAN NICOLAS ISLAND NOLF               2.20                    
SANTA MARIA PUBLIC APT                2.17                    
LOS ANGELES-USC                       1.99                    
LOS ALAMITOS AAF                      1.85                    
SANTA BARBARA 6.6 NW                  1.84                    
SANTA MONICA MUNI ARPT                1.80                    
VENTURA CITY HALL                     1.62                    
CAL POLY SAN LUIS OBISPO              1.49                    
BIG SUR 3.2 SE                        1.40                    
KING CITY 13.2 S                      1.24                    
LOS OSOS 0.5 N                        1.16                    

...SELECTED PEAK WIND GUSTS IN MILES PER HOUR EARLIER IN THE
EVENT...

...CALIFORNIA...
GRAPEVINE 3 SSE                       97                    
CARMEL VALLEY VILLAGE 10 SW           86                    
BIG BEAR CITY 13 ESE                  84                    
ACTON 9 SE                            82                    
MILL CREEK                            81                    
MOUNT WILSON 8 NNE                    80                    
ALTADENA 6 N                          77                    
CASTROVILLE 2 NW                      75                    
GRASS MOUNTAIN                        75                    
LANCASTER 14 WSW                      75                    
SAN PEDRO 4 E                         75                    
HESPERIA 5 SW                         72                    
RUNNING SPRINGS 2 NW                  71                    
SALINAS AIRPORT                       71                    
AGUANGA 6 SSE                         70                    
PYRAMID LAKE 6 NE                     70                    
SANDBERG                              70                    
CASTAIC LAKE 6 SSW                    69                    
CHILAO                                68                    
WOODLAND HILLS 3 SSW                  67                    
COALINGA 18 NW                        66                    
CORONA 5 WSW                          66                    
PT. PIEDRAS BLANCAS                   65                    
SANTA ROSA ISLAND                     65                    
BONEY MOUNTAIN                        63                    
LAKE PALMDALE                         63                    
TEPUSQUET                             63                    
TOPANGA                               62                    
HASTINGS                              61                    
HEARST CASTLE 40 W BUOY               60                    
SALINAS MUNI ARPT                     57                    
SAN JOSE/REID-HILLVIEW                50                    
SAN JOSE INTL ARPT                    47                    


THE DEEP LOW PRESSURE SYSTEM IS EXPECTED TO DRIFT EASTWARD INTO
CALIFORNIA AND GRADUALLY WEAKENS TODAY.  RAIN IS FORECAST TO
LINGER OVER MUCH OF CALIFORNIA TODAY BUT IS NOT EXPECTED TO BE
NEARLY AS HEAVY AS EARLIER TODAY.  AN ADDITIONAL HALF AN INCH OR
LESS OF RAIN CAN BE EXPECTED.  OVER SOUTHERN SIERRA NEVADA...AN
ADDITIONAL COUPLE INCHES OF SNOW IS FORECAST FOR TODAY.  THE STORM
IS EXPECTED TO WEAKEN AS IT MOVES FARTHER INLAND FOR THE REST OF
THE WEEKEND. NONETHELESS...RAINFALL OF 1 TO 3 INCHES ACROSS THE
LOWER COLORADO RIVER BASIN INTO THE MOGOLLON RIM OF ARIZONA WILL
CONTINUE TO POSE EXCESSIVE RAINFALL THREAT.

THE NEXT STORM SUMMARY WILL BE ISSUED BY THE WEATHER PREDICTION
CENTER AT 700 AM PST. PLEASE REFER TO YOUR LOCAL NATIONAL WEATHER
SERVICE OFFICE FOR ADDITIONAL INFORMATION ON THIS EVENT.

KONG