STORM SUMMARY NUMBER 02 FOR WESTERN U.S. HEAVY PRECIPITATION EVENT
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
700 AM PST WED JAN 18 2017

...STRONG MULTI-FACETED WINTER STORM PRODUCING WIDESPREAD
RAIN...ICE...AND SNOW FOR THE NORTHWEST AND CALIFORNIA...

WINTER STORM WARNINGS...WATCHES...AND WINTER WEATHER ADVISORIES
ARE IN EFFECT FROM THE SOUTHWEST U.S....NORTHWARD ACROSS THE
INTERMOUNTAIN WEST AND NORTHERN ROCKIES...AND INTO THE SIERRAS OF
CALIFORNIA.

ICE STORM WARNINGS AND FREEZING RAIN ADVISORIES ARE IN EFFECT FOR
MUCH OF CENTRAL WASHINGTON...PARTS OF NORTHERN OREGON...AND
NORTHERN IDAHO.

HIGH WIND WARNINGS ARE IN EFFECT FOR PORTIONS OF
WASHINGTON...OREGON...AND NORTHERN CALIFORNIA.

FLOOD WARNINGS...WATCHES...AND ADVISORIES ARE IN EFFECT FOR THE
LOWER ELEVATIONS OF WESTERN WASHINGTON AND OREGON.

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

AT 600 AM PST...AN UPPER LEVEL LOW REMAINED OFFSHORE AND WAS
APPROACHING THE PACIFIC NORTHWEST. SEVERAL SURFACE LOWS WERE
ASSOCIATED WITH THIS UPPER LEVEL FEATURE...THE STRONGEST HAVING A
CENTRAL PRESSURE OF 965 INCHES...28.50 INCHES AND WAS LOCATED NEAR
GRAHAM ISLAND...BRITISH COLUMBIA. COLD FRONTS EXTENDED INTO THE
EASTERN PACIFIC FROM A COUPLE OF THESE LOWS...AND AHEAD OF THESE
WAS A DEEP SURGE OF PACIFIC MOISTURE REACHING THE WEST COAST.
NATIONAL WEATHER SERVICE DOPPLER RADARS AND SURFACE OBSERVATIONS
INDICATED MODERATE TO LOCALLY HEAVY RAIN ONGOING ACROSS THE LOWER
ELEVATIONS OF WESTERN WASHINGTON...WESTERN OREGON...AND NORTHERN
AND CENTRAL CALIFORNIA. SEVERE ICING CONTINUES FOR MANY OF THE
INTERIOR VALLEYS OF CENTRAL WASHINGTON FROM PERSISTENT FREEZING
RAIN AND SURFACE TEMPERATURES THAT ARE WELL BELOW FREEZING. MIXED
PRECIPITATION WAS OCCURRING IN THE NORTHERN GREAT BASIN AND
PORTIONS OF THE NORTHERN ROCKIES...WITH SNOW FALLING IN THE HIGHER
ELEVATIONS OF THE NORTHERN ROCKIES.

...SELECTED STORM TOTAL RAINFALL IN INCHES FROM 100 AM PST TUE JAN
17 THROUGH 600 AM PST WED JAN 18...

...OREGON...
ASTORIA                               1.73                    
BROOKINGS 5 NNW                       1.50                    
SALEM                                 0.87                    
PORTLAND                              0.66                    

...WASHINGTON...
TRACYTON 2 NE                         3.00                    
QUILLAYUTE                            2.62                    
SEATTLE                               1.64                    
HOQUIAM                               1.40                    

...SELECTED STORM TOTAL FREEZING RAIN ICE AMOUNTS IN INCHES FROM
100 AM PST TUE JAN 17 THROUGH 600 AM PST WED JAN 18...

...OREGON...
HERMISTON 2 N                         0.25                    
PAULINA 6 E                           0.10                    

...WASHINGTON...
STEVENSON                             1.00                    
SKAMANIA 1 W                          0.75                    
EAST WENATCHEE 1 NNE                  0.25                    
GRANDVIEW                             0.25                    
NORTH BEND 6 E                        0.25                    
THE DALLES 8 NNE                      0.25                    
YAKIMA 2 WNW                          0.25                    
AIRWAY HEIGHTS                        0.20                    
SPOKANE 3 SSE                         0.13                    

...SELECTED STORM TOTAL SNOWFALL IN INCHES FROM 100 AM PST TUE JAN
17 THROUGH 600 AM PST WED JAN 18...

...WASHINGTON...
LEAVENWORTH 2 SSW                     7.0                    
INCHELIUM                             3.0                    

...SELECTED STORM TOTAL SLEET IN INCHES FROM 100 AM PST TUE JAN 17
THROUGH 600 AM PST WED JAN 18...

...OREGON...
SPOKANE                               0.80                    
ECHO                                  0.50                    

...WASHINGTON...
SE KENNEWICK                          0.50                    

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

...OREGON...
NEWPORT                               86                    
MARYS PEAK                            84                    
SEA LION CAVES                        81                    
GARIBALDI                             72                    
ASTORIA                               60                    

...WASHINGTON...
ABERNATHY MOUNTAIN                    78                    
NASELLE 3 NNE                         77                    
CAPE DISAPPOINTMENT                   73                    
LONG BEACH                            63                    


AS THE UPPER LEVEL LOW AND ASSOCIATED SURFACE FRONTS MOVE
EASTWARD...THE SIGNIFICANT PRECIPITATION EVENT IS EXPECTED TO
CONTINUE OVER THE NEXT COUPLE OF DAYS WITH THE AXIS OF HIGHEST
MOISTURE MOVING SOUTHWARD ACROSS NORTHERN AND CENTRAL CALIFORNIA
BY WEDNESDAY NIGHT AND THURSDAY MORNING. THE GREATEST RAINFALL
TOTALS THROUGH THURSDAY MORNING ARE EXPECTED OVER COASTAL
CALIFORNIA...WHERE 3 TO LOCALLY 6 INCHES OF RAINFALL IS POSSIBLE.
HEAVY SNOW IS EXPECTED FOR THE SIERRA NEVADA MOUNTAINS WITH
SNOWFALL AMOUNTS LIKELY WELL OVER A FOOT. WIDESPREAD
SNOW...INCLUDING FOR LOWER ELEVATIONS...IS ALSO EXPECTED TO REACH
THE INTERMOUNTAIN WEST...THE ROCKIES...AND THE SOUTHWEST AS THE
STORM SYSTEM MOVES INLAND. THE THREAT OF ICE WILL CONTINUE FOR
TODAY...BUT IS EXPECTED TO END BY THURSDAY AFTERNOON.

THE NEXT STORM SUMMARY WILL BE ISSUED BY THE WEATHER PREDICTION
CENTER AT 100 PM PST. PLEASE REFER TO YOUR LOCAL NATIONAL WEATHER
SERVICE OFFICE FOR ADDITIONAL INFORMATION ON THIS EVENT.

TATE