THE HYDROMETEOROLOGICAL PREDICTION CENTER
COLLEGE PARK, MD
STORM SUMMARY MESSAGE
STORM SUMMARY NUMBER 07 FOR PACIFIC NORTHWEST HEAVY RAIN AND SNOW
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
700 PM PST TUE NOV 20 2012
...MULTI-DAY HEAVY RAIN AND SNOW EVENT CONTINUES ACROSS THE
PACIFIC NORTHWEST AND NORTHERN CALIFORNIA...
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. ADDITIONALLY...SUCH ADVISORIES
ARE IN PLACE ACROSS AREAS OF THE CASCADES AS WELL AS NORTHWESTERN
MONTANA.
FLOOD WATCHES AND WARNINGS ARE IN EFFECT FOR WESTERN PORTIONS OF
OREGON AND WASHINGTON AS WELL AS OVER NORTHERN IDAHO.
HIGH WIND WARNINGS AND WIND ADVISORIES ARE IN EFFECT FOR SECTIONS
OF SOUTH-CENTRAL OREGON...NORTHERN CALIFORNIA...NORTHWESTERN
NEVADA...AS WELL AS SECTIONS OF SOUTHWESTERN MONTANA.
FOR A DETAILED GRAPHICAL DEPICTION OF THE LATEST
WATCHES...WARNINGS AND ADVISORIES...PLEASE SEE WWW.WEATHER.GOV
AT 600 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 BROAD REGION OF MODERATE RAINFALL WAS ADVANCING THROUGH NORTHERN
CALIFORNIA WITH THE STRONGEST ACTIVITY OVER THE INTERIOR OF THE
STATE. TO THE NORTH...A BROAD AREA OF SHOWERS WERE PUSHING THROUGH
NORTHWESTERN OREGON/WESTERN WASHINGTON WITH THE ACTIVITY BEING
ENHANCED BY LOCAL TOPOGRAPHY...PARTICULARLY OVER THE WASHINGTON
OLYMPICS. DOWNSLOPING FLOW TO THE EAST INDICATED A BREAK IN THE
ACTION WHILE SCATTERED LIGHT SHOWERS WERE FALLING OVER SECTIONS OF
SOUTHEASTERN WASHINGTON...NORTHEASTERN OREGON...AND EASTERN
IDAHO/WESTERN MONTANA. GIVEN THE RELATIVELY MILD AIR IN
PLACE...MOST OF THE OBSERVING NETWORKS INDICATED LIQUID
PRECIPITATION WITH SNOW POSSIBLY FALLING OVER THE HIGHER MOUNTAIN
TOPS.
...SELECTED STORM TOTAL RAINFALL IN INCHES FROM 400 AM PST SAT NOV
17 THROUGH 600 PM PST TUE NOV 20...
...CALIFORNIA...
FORT DICK RIVER 6.52
BONANZA KING 5.28
GASQUET RS 4.72
HONEYDEW 1 SW 4.72
CALLENGE-BROWNSVILLE 1.3 WSW 4.62
COFFEE RIDGE 4.40
GRASS VALLEY 4.32
CRESCENT CITY 5 NE 4.14
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
...IDAHO...
HIDDEN LAKE 4.40
SCHWEITZER BASIN 3.80
BEAR MOUNTAIN 3.30
...OREGON...
HARBOR 3 NE 9.84
LEES CAMP 7.90
RED MOUNDS RAWS 7.84
NEHALEM 7.75
BROOKINGS 7.72
GOLD BEACH 7.15
CEDAR CREEK RAWS 7.03
PORT ORFORD 5 E 6.85
ASTORIA 6.65
NESIKA BEACH 2 E 6.60
SADDLE MOUNTAIN 5.20
SCAPPOOSE 4.80
CANYONVILLE 2 S 4.62
TIMBER 1.4 NNW 4.58
GRANDE RONDE 4.50
SALEM/MCNARY FIELD 4.48
SEXTON SUMMIT 4.29
PORTLAND/HILLSBORO ARPT 3.65
...WASHINGTON...
NEHALEM 7.75
CEDAR CREEK RAWS 7.03
TIDEWATER RAWS 6.76
FRANCES 6.50
HUCKLEBERRY 6.20
TILLAMOOK RAWS 5.58
ROCKHOUSE RAWS 5.50
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
OLYMPIA AIRPORT 3.27
TACOMA NARROWS AIRPORT 3.01
...SELECTED STORM TOTAL SNOWFALL IN INCHES FROM 400 AM PST SAT NOV
17 THROUGH 600 PM PST TUE NOV 20...
...CALIFORNIA...
SODA SPRINGS 1.5 SSW 12.0
...IDAHO...
COLBURN 4 WSW 8.0
...MONTANA...
FLATTOP MOUNTAIN 14.0
...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...
GASQUET 5 ESE (3698 FT) 70
ORLEANS 7 WNW (4170 FT) 70
COOSKIE MOUNTAIN RAWS (1640 FT) 68
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
MOUNT HEBO 106
MEGLER TOWER (1189 FT) 101
YAQUINA HEAD 98
BENTON CITY 10 NNW 97
COLUMBIA RIVER BAR 97
CAPE DISAPPOINTMENT 92
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 100 AM PST. PLEASE REFER TO YOUR LOCAL
NATIONAL WEATHER SERVICE OFFICE FOR ADDITIONAL INFORMATION ON THIS
EVENT.
RUBIN-OSTER
Last Updated: 933 PM EST TUE NOV 20 2012