THE HYDROMETEOROLOGICAL PREDICTION CENTER
CAMP SPRINGS, MD
STORM SUMMARY MESSAGE
STORM SUMMARY NUMBER 2 FOR WESTERN U.S. HEAVY PRECIPITATION EVENT
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
100 AM PST SUN DEC 19 2010
...MAJOR HEAVY RAIN AND MOUNTAIN SNOW EVENT NOW UNDERWAY FOR THE
WEST COAST AS A SERIES OF MOISTURE-LADEN PACIFIC STORMS MOVE
ASHORE...
WINTER STORM WARNINGS ARE IN EFFECT FOR THE OREGON CASCADES...AND
THE MOUNTAINOUS AREAS OF CENTRAL AND NORTHERN CALIFORNIA. WINTER
WEATHER ADVISORIES ARE IN EFFECT FOR MUCH OF CENTRAL AND EASTERN
OREGON...AND PARTS OF NORTHERN CALIFORNIA. FLOOD ADVISORIES AND
FLOOD WATCHES ARE IN EFFECT FOR THE LOWER ELEVATIONS OF CENTRAL
CALIFORNIA AND EXTENDING SOUTHWARD TOWARDS LOS ANGELES.
WINTER STORM WARNINGS AND WINTER WEATHER ADVISORIES ARE IN EFFECT
FOR THE HIGHEST TERRAIN OF UTAH...COLORADO...IDAHO...AND WYOMING.
FOR A DETAILED GRAPHICAL DEPICTION OF THE LATEST
WATCHES...WARNINGS AND ADVISORIES...PLEASE SEE WWW.WEATHER.GOV
AT 1200 AM PST...NATIONAL WEATHER SERVICE RADAR AND SURFACE
OBSERVATIONS INDICATED WIDESPREAD MODERATE TO HEAVY PRECIPITATION
OVER CENTRAL CALIFORNIA...AND ALSO FROM NORTHERN CALIFORNIA INTO
OREGON AND WASHINGTON. VERY HEAVY MOUNTAIN SNOW IS ONGOING WITH
SNOW LEVELS AROUND 7000 FEET IN THE SIERRA NEVADA RANGE...AND 5000
TO 6000 FEET FURTHER TO THE NORTH. BLIZZARD CONDITIONS WERE
OCCURRING ALONG THE HIGHEST ELEVATIONS. THE GREATEST SNOWFALL THUS
FAR HAS BEEN FOR ELEVATIONS ABOVE 8000 FEET.
...SELECTED STORM TOTAL SNOWFALL IN INCHES FROM 700 PM PST FRI DEC
17 THROUGH 1200 AM PST SUN DEC 19...
...CALIFORNIA...
MAMMOTH LAKES 2 W 37.0
BLACKCAP BASIN 33.0
ALPINE MEADOWS 30.0
CHARLOTTE LAKE 30.0
CHAGOOPA PLATEAU 29.0
GREEN MOUNTAIN 28.0
OSTRANDER LAKE 27.0
AGNEW PASS 26.0
TENAYA LAKE 25.0
SQUAW VALLEY 24.0
TRUCKEE 12.0
...NEVADA...
MOUNT ROSE SKI AREA 27.0
HEAVENLY VALLEY 20.0
INCLINE VILLAGE 5 ENE 19.0
GARDNERVILLE 2 NW 10.3
CARSON CITY 5 S 10.0
VIRGINIA CITY 5 E 8.0
RENO 5.0
...OREGON...
THREE RIVERS 1 N 12.0
WSW CAMP SHERMAN 9.0
HOOD RIVER 8.0
SUNRIVER 8.0
TIMBERLINE LODGE 8.0
WILSON RIVEER SUMMIT 8.0
TUMALO 9 NW 7.0
WILLAMEETTE PASS 7.0
...WASHINGTON...
CARSON 7.0
...SELECTED STORM TOTAL PRECIPITATION IN INCHES FROM 700 PM PST
FRI DEC 17 THROUGH 1200 AM PST SUN DEC 19...
...A PORTION OR ALL OF THE PRECIPITATION AT SOME OF THESE SITES
MAY HAVE FALLEN AS SNOW...HOWEVER SNOWFALL MEASUREMENTS WERE NOT
AVAILABLE...
...ARIZONA...
BLACK ROCK 1.33
...CALIFORNIA...
BEARTRAP MEADOW 10.18
NATURE POINT 9.72
WOFFORD HEIGHTS 6.66
JERSEYDALE 6.01
BLUE CANYON 4.81
SANTA MARIA PUBLIC APT 3.11
OXNARD AIRPORT 3.05
SAN LUIS OBISPO CO ARPT 2.98
SANTA BARBARA MUNI ARPT 2.91
OAK CREEK 2.49
VANDENBERG AFB/LOMPOC 2.43
CAMARILLO AIRPORT 2.40
SANTA MONICA MUNI ARPT 1.90
LOS ANGELES INTL ARPT 1.42
LAKE TAHOE AIRPORT 1.19
REDDING MUNI ARPT 1.17
...OREGON...
SEXTON SUMMIT 1.68
...SELECTED PEAK WIND GUSTS IN MILES PER HOUR EARLIER IN THE
EVENT...
...CALIFORNIA...
ALPINE MEADOWS SUMMIT 126
VIRGINIA PEAK 94
SQUAW VALLEY SUMMIT 46
SOUTH LAKE TAHOE 44
...NEVADA...
SLIDE MOUNTAIN 47
RENO 41
A SERIES OF MOIST PACIFIC SYSTEMS WILL CONTINUE TO INUNDATE THE
WESTERN U.S. FOR THE REST OF THE WEEKEND AND EARLY INTO THIS WEEK.
THIS IS THE RESULT OF A MID AND UPPER LEVEL JET STREAM THAT IS
ORIENTED PERPENDICULAR TO THE COAST...WHICH WILL CONTINUE TO
STREAM SUBTROPICAL MOISTURE INTO THE REGION. ADDITIONAL RAINFALL
AMOUNTS OF THREE TO SIX INCHES...WITH LOCALIZED AMOUNTS AS HIGH AS
NINE INCHES...CAN BE EXPECTED THROUGH WEDNESDAY MORNING. TOTAL
SNOWFALL AMOUNTS OF 2 TO 4 FEET WILL BE POSSIBLE AT ELEVATIONS
ABOVE 5000 FEET...WITH 6 TO 8 FEET OF SNOWFALL POSSIBLE AT
ELEVATIONS ABOVE 7000 FEET. THE HEAVIEST OF THE PRECIPITATION
SHOULD BEGIN TO TAPER OFF BY LATE ON MONDAY.
THE NEXT STORM SUMMARY WILL BE ISSUED BY THE HYDROMETEOROLOGICAL
PREDICTION CENTER AT 700 AM PST. PLEASE REFER TO YOUR LOCAL
NATIONAL WEATHER SERVICE OFFICE FOR ADDITIONAL INFORMATION ON THIS
EVENT.
RYAN
Last Updated: 334 AM EST SUN DEC 19 2010