AVALANCHE WATCH
Warning Issue Date: 1230 PM PST THU DEC 31 2009
AVALANCHE WATCH FOR THURSDAY AFTERNOON AND NIGHT...
A FRONTAL SYSTEM SHOULD CROSS THE NORTHWEST ON THURSDAY AFTERNOON
AND NIGHT. THIS SHOULD CAUSE INCREASING STRONG SOUTHWEST CREST LEVEL
WINDS AND INCREASING MODERATE TO HEAVY SNOW WITH A WARMING TREND.
THIS WEATHER SHOULD CAUSE INCREASING DENSE SNOW TO ACCUMULATE OVER
LOWER DENSITY LAYERS AND POTENTIAL PREVIOUS HOAR FROST. A HIGH
AVALANCHE DANGER AT HIGHER ELEVATIONS AND NATURAL AND HUMAN
TRIGGERED AVALANCHES SHOULD BECOME LIKELY THURSDAY AFTERNOON AND
NIGHT.
THIS STATEMENT WILL UPDATED AS WARRANTED. PLEASE VISIT WWW.NWAC.US
FOR DETAILS.
$$
BACKCOUNTRY TRAVELERS SHOULD BE AWARE THAT ELEVATION AND
GEOGRAPHIC DISTINCTIONS ARE APPROXIMATE AND THAT A TRANSITION
ZONE BETWEEN DANGERS EXISTS. REMEMBER THERE ARE AVALANCHE SAFE
AREAS IN THE MOUNTAINS DURING ALL LEVELS OF AVALANCHE DANGER.
CONTACT LOCAL AUTHORITIES IN YOUR AREA OF INTEREST FOR FURTHER
INFORMATION.
NWAC WEATHER DATA AND FORECASTS ARE ALSO AVAILABLE BY CALLING
206-526-6677 FOR WASHINGTON, 503-808-2400 FOR THE MT HOOD AREA OR BY
VISITING OUR WEB SITE AT WWW.NWAC.US.
FERBER/NORTHWEST WEATHER AND AVALANCHE CENTER
$$
WINTER STORM WARNING
Warning Issue Date: 412 PM PST WED DEC 30 2009
...WINTER STORM WARNING IN EFFECT FROM 6 AM TO 9 PM PST
THURSDAY FOR THE NORTH AND CENTRAL OREGON CASCADES...
THE NATIONAL WEATHER SERVICE IN PORTLAND HAS ISSUED A WINTER
STORM WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT FROM 6 AM TO 9
PM PST THURSDAY. THE WINTER STORM WATCH FOR SNOW IS NO LONGER IN
EFFECT.
A STRONG PACIFIC STORM SYSTEM WILL APPROACH THURSDAY...WITH HEAVY
SNOW DEVELOPING IN THE MORNING. SNOW...HEAVY AT TIMES...WILL
CONTINUE INTO THURSDAY EVENING.
* TIMING...SNOW WILL DEVELOP THURSDAY MORNING...AND INCREASE IN
INTENSITY BY NOON.
* ACCUMULATIONS...2 TO 4 FEET ARE LIKELY ABOVE 5000 FEET...WITH 1
TO 2 FEET EXPECTED BELOW 5000 FEET. HIGHEST AMOUNTS SHOULD BE
SOUTH OF MOUNT HOOD.
* SNOW LEVELS...WILL START AROUND 1500 TO 2000 FEET IN THE
MORNING...THEN SLOWLY RISE DURING THE DAY...REACHING 3500 FEET
IN THE NORTH TO 5000 FEET OVER LANE COUNTY BY LATE AFTERNOON. SNOW
LEVELS WILL CONTINUE RISING THURSDAY NIGHT...RANGING FROM 5000
FEET IN THE NORTH TO 6000 FEET OVER LANE COUNTY.
* IMPACTS...EXPECT SIGNIFICANT TRAVEL DIFFICULTIES OVER THE
CASCADES ON THURSDAY AND INTO THURSDAY NIGHT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER
CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF
SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN
AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...
FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY.
$$
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