AVWMFR

The Mount Shasta Avalanche Center has issued a BACKCOUNTRY
AVALANCHE WARNING for the following areas:
NWS Medford OR - CAZ082 (South Central Siskiyou County).

* WHAT...An exceptionally powerful atmospheric river will impact
the Mount Shasta region. Prolonged periods of heavy snowfall,
along with rain-on-snow will create high avalanche danger.

* WHERE...Avalanche terrain of Mount Shasta, Castle Lake, the
Eddy Mountains, and Ash Creek Butte area east of Mount Shasta.

* WHEN...In effect from Tue 12:00 PST to Thu 12:00 PST.

* IMPACTS...Intense rainfall and multiple feet of new snow will
produce large and destructive avalanches. These avalanches may
run long distances into flat terrain, valley floors, and mature
forests. In addition, debris flows are possible out of Mount
Shasta drainages such as Cascade Gulch, Ash Creek, and Mud
Creek.

* PRECAUTIONARY / PREPAREDNESS ACTIONS...Very dangerous avalanche
conditions. Travel in, near, or below avalanche terrain is not
recommended. Recreational users without backcountry avalanche
skills are advised to stay out of the backcountry. Deep snow
conditions exist.

Consult http://shastaavalanche.org/ or www.avalanche.org for more
detailed information.

Similar avalanche danger may exist at locations outside the
coverage area of this or any avalanche center.

* WHAT...Flooding caused by excessive rainfall and snowmelt is
expected.

* WHERE...A portion of northern California, including the following
county, Siskiyou, including the cities of Mount Shasta City, Weed,
Callahan and Tennant.

* WHEN...Until midnight PST Friday Night.

* IMPACTS...Flooding of rivers, creeks, streams, and other low-lying
and flood-prone locations is imminent or occurring.

* ADDITIONAL DETAILS...
- At 1042 PM PST, Satellite estimates and rain gauge data
indicate heavy rain and snowmelt in the warned area. Flooding
is ongoing or expected to begin shortly. Between 2 and 6
inches of rain have fallen.
- Additional rainfall amounts of 3 to 7 inches are possible in
the warned area. Many areas that received heavy snowfall
earlier have switched over to rain. Rain can melt the snow
and cause a higher runoff response than rainfall alone.
- Some locations that will experience flooding include...
Mount Shasta, Weed, Dunsmuir, Pilgrim Creek Snow Park, Trout
Creek Campground, Cattle Camp Campground, Fowlers Camp
Campground And McCloud Falls, McCloud, Tennant, Mount Shasta
Summit Plateau, Mount Shasta Ski Park Highway, Mount Shasta
Bunny Flat Trail, Mcbride Springs Campground, Pondosa, Four
Corners Snow Park, I 5 Black Butte Summit, Carrick, Edgewood,
Medicine Lake Campground and Callahan.
- http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

* WHAT...Flooding caused by excessive rainfall and snow melt is
expected.

* WHERE...Portions of southwest Oregon, including Coos, Curry,
Jackson, and Josephine counties and western Siskiyou County in
northern California.

* WHEN...Until midnight PST Friday Night.

* IMPACTS...Flooding of rivers, creeks, streams, and other low-lying
and flood-prone locations is expected.

* ADDITIONAL DETAILS...
- At 1227 PM PST, satellite estimates and rain gauge data
indicate heavy rain in the warned area. Between 1 and 6
inches of rain have fallen.
- Additional rainfall amounts of 3 to 7 inches are possible in
the warned area. Some areas will receive snowfall and then
switch to rainfall. Rain can melt the snow and cause a higher
runoff response than rainfall alone.
- http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

* WHAT...South winds 25 to 40 mph with gusts up to 60 mph.

* WHERE...Northeast Siskiyou and Northwest Modoc Counties, this
includes the cities of Macdoel, Dorris, Tulelake, and Newell.

* WHEN...Until 10 AM PST Friday.

* IMPACTS...Damaging winds will blow down trees and power lines.
Widespread power outages are expected. Travel will be difficult,
especially for high profile vehicles.

* ADDITIONAL DETAILS...Gusty winds persist overnight, but could ease
for a time into Thursday afternoon. Strong winds are likely to
redevelop Thursday evening with gusts to 60 mph into Friday
morning.

Remain in the lower levels of your home during the windstorm, and
avoid windows. Watch for falling debris and tree limbs. Use caution
if you must drive.

* WHAT...South winds 25 to 40 mph with gusts up to 60 mph.

* WHERE...The Shasta Valley in central Siskiyou COunty, including
Weed, Grenada, Montague, and portions of Interstate 5 and Highway
97.

* WHEN...Until 10 AM PST Friday.

* IMPACTS...Damaging winds could blow down trees and power lines.
Power outages are possible. Travel will be difficult, especially
for high profile vehicles. Unsecured objects may be lost or
damaged.

* ADDITIONAL DETAILS...Gusty winds persist overnight, but could ease
for a time into Thursday afternoon. Strong winds are likely to
redevelop Thursday evening with gusts to 60 mph into Friday
morning.

Watch for falling debris and tree limbs. Use caution if you must
drive.

* WHAT...Wet snow above 4500 feet. Additional snow accumulations 3
to 6 inches.

* WHERE...Central and Southeast Siskiyou County. This includes
Snowmans Summit on Highway 89 and the higher terrain around Mount
Shasta.

* WHEN...Until 7 AM PST Thursday.

* IMPACTS...Travel could be very difficult with reduced visibility.
The hazardous conditions could impact the Thursday morning commute.

* ADDITIONAL DETAILS...Snow levels will gradually rise to around
6000 feet early Thursday morning with snow changing to rain.

Slow down and use caution while traveling. Call 511 or visit
quickmap.dot.ca.gov for road information.