STORM SUMMARY NUMBER 06 FOR PACIFIC NORTHWEST HEAVY RAIN AND SNOW
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
100 PM PST TUE NOV 20 2012

...MULTI-DAY HEAVY RAIN AND SNOW EVENT CONTINUES FOR THE PACIFIC
NORTHWEST AND NORTHERN CALIFORNIA...     

BLIZZARD WARNINGS ARE IN EFFECT FOR THE HIGHER ELEVATIONS OF
NORTHWESTERN MONTANA.

WINTER STORM WARNINGS ARE IN EFFECT FOR THE HIGH ELEVATIONS OF
CENTRAL IDAHO.

A WINTER WEATHER ADVISORY HAS BEEN ISSUED FOR THE WEST SLOPES OF
THE NORTHERN SIERRA NEVADA ALONG WITH THE NORTHERN OLYMPIC
MOUNTAINS.

FLOOD WATCHES AND WARNINGS ARE IN EFFECT FOR PORTIONS OF
WASHINGTON...WESTERN OREGON...AS WELL AS NORTHERN IDAHO.

HIGH WIND WARNINGS AND WIND ADVISORIES ARE IN EFFECT FOR PORTIONS
OF SOUTH-CENTRAL/EASTERN OREGON...NORTHERN
CALIFORNIA...NORTHWESTERN NEVADA...AS WELL AS SECTIONS OF WESTERN
MONTANA.

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

AT 1200 PM PST...AN UPPER-LEVEL LOW LOCATED OVER THE NORTHEAST
PACIFIC CONTINUES TO DIRECT ENERGETIC DISTURBANCES ALOFT AND
PACIFIC MOISTURE INTO THE NORTHWESTERN U.S. CURRENT NATIONAL
WEATHER SERVICE DOPPLER RADARS AND SURFACE OBSERVATIONS INDICATED
A MODERATE BAND OF RAINFALL ADVANCING INTO THE NORTH-CENTRAL
CALIFORNIA WITH LIGHTER ACTIVITY CROSSING THE CALIFORNIA/OREGON
BORDER. TO THE NORTH...A BROAD AREA OF SHOWERS WERE PUSHING
THROUGH NORTHWESTERN OREGON/WESTERN WASHINGTON WITH THE ACTIVITY
BEING ENHANCED BY LOCAL TOPOGRAPHY. DOWNSLOPING FLOW TO THE EAST
INDICATED A BREAK IN THE ACTION BEFORE ANOTHER BATCH OF RAIN
SHOWERS WERE AFFECTING EASTERN WASHINGTON/NORTHERN IDAHO. A POCKET
OF FREEZING RAIN WAS EVEN BEING REPORTED IN MULLAN PASS...IDAHO.

...SELECTED STORM TOTAL RAINFALL IN INCHES FROM 400 AM PST SAT NOV
17 THROUGH 1200 PM PST TUE NOV 20...

...CALIFORNIA...
CALLENGE-BROWNSVILLE 1.3 WSW          4.62                    
GRASS VALLEY                          4.32                    
CAZADERO 5.6 W                        3.99                    
SHINGLETON 2.8 NNW                    3.79                    
POLLOCK PINES 0.5 NW                  3.55                    
REDDING 3.8 S                         3.49                    
SANTA CRUZ 6.3 NNE                    3.49                    
NEVADA CITY 3.4 NNW                   3.32                    
ANDERSON 2.6 NE                       3.30                    
BLUE CANYON                           3.26                    
LOS GATON 5.2 SSW                     3.21                    
REDDING MUNI ARPT                     1.87                    

...OREGON...
LEES CAMP                             7.90                    
NEHALEM                               7.75                    
GOLD BEACH                            7.15                    
CEDAR CREEK RAWS                      7.03                    
ASTORIA                               6.65                    
SADDLE MOUNTAIN                       5.20                    
CEDAR CREEK                           4.87                    
SCAPPOOSE                             4.80                    
TIMBER 1.4 NNW                        4.58                    
GRANDE RONDE                          4.50                    
SALEM/MCNARY FIELD                    4.48                    
SEXTON SUMMIT                         4.29                    
ROSEBURG MUNICIPAL AIRPORT            3.95                    
AURORA                                3.71                    
PORT ORFORD 5.0 E                     3.69                    
PORTLAND/HILLSBORO ARPT               3.65                    

...WASHINGTON...
HUCKLEBERRY                           6.20                    
HOQUIAM/BOWERMAN AIRPORT              5.17                    
SHELTON/SANDERSON FIELD ARPT          5.04                    
OLYMPIA 4.5 NW                        4.86                    
BREMERTON NATIONAL ARPT               4.52                    
LANGLOIS 1 NNE                        4.07                    
LILLIWAUP                             4.00                    
N HAMMA HAMMA                         4.00                    
OYSTERVILLE 1 SW                      3.70                    
QUILLAYUTE                            3.31                    
SEATTLE/BOEING FIELD                  3.31                    
BATTLE GROUND                         3.29                    
BRINNON 1.7 WSW                       3.28                    
OLYMPIA AIRPORT                       3.27                    
BELFAIR 3.2 WSW                       3.20                    
MONTESANO 4.5 SW                      3.18                    
TACOMA NARROWS AIRPORT                3.01                    
VANCOUVER                             2.58                    
COSMOPOLIS 6.0 SE                     2.25                    

...SELECTED STORM TOTAL SNOWFALL IN INCHES FROM 400 AM PST SAT NOV
17 THROUGH 1200 PM PST TUE NOV 20...

...CALIFORNIA...
SODA SPRINGS 1.5 SSW                 12.0                    

...IDAHO...
COLBURN 4 WSW                         8.0                    

...WASHINGTON...
CHEWELAH 8 E                          9.0                    
CURLEW LAKE STATE 11 SE               6.0                    
NEWMAN LAKE 10 N                      6.0                    

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

...CALIFORNIA...
WESTHAVEN-MOONSTONE 3 N               67                    

...MONTANA...
EAST GLACIER PARK 8 SE                76                    
SAINT MARY                            67                    

...OREGON...
MOUNT HEBO                           106                    
YAQUINA HEAD                          98                    
ASTORIA 5 W                           92                    
GARIBALDI                             90                    
LINCOLN CITY                          85                    
NEWPORT                               83                    
PACIFIC CITY WSW                      75                    
ROCKAWAY BEACH                        70                    
ASTORIA                               60                    
NEWBERG                               60                    

...WASHINGTON...
NASELLE RIDGE (2000 FT)              114                    
ABERNATHY MTN                        111                    
MEGLER TOWER (1189 FT)               101                    
BENTON CITY 10 NNW                    97                    
CRYSTAL MOUNTAIN                      78                    
HURRICANE RIDGE 2 SW                  68                    


THE UPPER LOW RESPONSIBLE FOR STEERING THE STRONG DISTURBANCES
TOWARD THE PACIFIC NORTHWEST SHOULD GRADUALLY LIFT TOWARD THE
NORTH WHILE WEAKENING. BEFORE THIS OCCURS...A POTENT SYSTEM IS
FORECAST TO ADVANCE THROUGH OREGON OVERNIGHT BRINGING ANOTHER
ROUND OF MODERATE TO HEAVY PRECIPITATION. STRONG ONSHORE FLOW IN
ADDITION TO THIS JET ENERGY WILL ALLOW FOR PERIODS OF HEAVY
RAIN...GUSTY WINDS...AND HIGHER ELEVATION SNOW. OVERALL...EXPECT
UNSETTLED CONDITIONS TO PERSIST UNTIL LATE WEDNESDAY BEFORE AN
UPPER RIDGE BUILDS OVER THE REGION BY THURSDAY. A WIDESPREAD 1 TO
2 INCHES OF PRECIPITATION IS POSSIBLE FROM THE NORTHERN SIERRA
NEVADA UP ALONG WESTERN SECTIONS OF OREGON/WASHINGTON. A SECONDARY
MAXIMA OF SIMILAR AMOUNTS IS ALSO EXPECTED OVER THE SAWTOOTH AND
BITTERROOTS OF IDAHO. OF COURSE LOCALIZED HEAVIER AMOUNTS WILL BE
POSSIBLE...PARTICULARLY ALONG UPSLOPE TERRAIN. IN
ADDITION...SNOWFALL IN EXCESS OF A FOOT IS EXPECTED OVER THE
WASHINGTON CASCADES ALONG WITH THE SAWTOOTH. OVER THE DURATION OF
THE EVENT...CERTAIN AREAS OF COASTAL OREGON/WASHINGTON HAVE
ALREADY SEEN IN EXCESS OF 6 INCHES OF RAIN FALL OVER THE REGION.
ANY ADDITIONAL PRECIPITATION MAY FURTHER ENHANCE THE THREAT FOR
FLOODING.

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

RUBIN-OSTER