Severe

* WHAT...Sunday morning, sub-freezing temperatures as low as 28 expected. Monday morning, sub-freezing temperatures as low as 27 expected. * WHERE...Valleys of western and central Siskiyou County, including the Shasta Valley, Scott Valley, portions of the lower Klamath River Valley. This also includes Mount Shasta City and areas to the east. * WHEN...For the first Freeze Warning, from 2 AM to 8 AM PDT Sunday. For the second Freeze Warning, from 2 AM to 9 AM PDT Monday.

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of northwest Arizona, including the following areas, Hualapai Mountains, Lake Havasu and Fort Mohave, Lake Mead - AZ side, Lake Mohave - AZ side, Northwest Deserts and Northwest Plateau, southeast California, including the following areas, Cadiz Basin, Eastern Mojave Desert, Morongo Basin and San Bernardino County-Upper Colorado River Valley, and Nevada, including the

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of southeast California, including the following areas, Death Valley National Park and Western Mojave Desert and south central Nevada, including the following area, Esmeralda and Central Nye County. * WHEN...From 5 PM PDT this afternoon through late Sunday night. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations.

* Affected Area...Fire Weather Zone 424 Southeastern Humboldt County and northern Lander County, Fire Weather Zone 437 Humboldt County-Quinn, Fire Weather Zone 438 W Elko County, N Eureka and Lander Counties N of I80, Fire Weather Zone 469 Central Elko County and Fire Weather Zone 470 Eastern Elko County. * WIND...Sustained Southwest winds of 15-25 mph gusting 25-40 mph. * HUMIDITY...Humidity as low as 15-25%. * Impacts...Any fires that develop will likely spread rapidly.

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...western Coconino, northern Gila, far southern Navajo, and Yavapai counties. * WHEN...Through late Sunday night. * IMPACTS...Flash flooding will be possible in creeks, normally dry washes, swimming holes, and over recently burned areas. Raging killer currents will be possible in side canyons and narrow slot canyons. Low-water crossings may be flooded. * ADDITIONAL DETAILS...

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of Southwest California, including the following areas, Apple and Lucerne Valleys, Coachella Valley, Riverside County Mountains, San Bernardino County Mountains, San Diego County Coastal Areas, San Diego County Deserts, San Diego County Mountains, San Diego County Valleys and San Gorgonio Pass near Banning. * WHEN...From 11 PM PDT this evening through Sunday evening.

* WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Central Interior Cumberland and Androscoggin Counties. * WHEN...From 2 AM to 8 AM EDT Sunday. * IMPACTS...Sensitive outdoor plants may be killed if left uncovered. Take steps now to protect tender plants from the cold.

* WHAT...Heavy, wet snow expected. Total snow accumulations between 6 and 12 inches. Highest snowfall amounts in the northern slopes between 4500 feet and 6500 feet. Winds gusting as high as 45 mph. * WHERE...Elkhorn and Boulder Mountains, Little Belt and Highwood Mountains, and Snowy and Judith Mountains. * WHEN...From 6 PM this evening to 6 AM MDT Monday. * IMPACTS...Travel could be very difficult. Gusty winds combined with the wet and heavy nature of the snow could bring down tree branches. Isolated power outages are possible.

* WHAT...Heavy, wet snow expected. Total snow accumulations between 7 and 14 inches. Winds gusting as high as 35 mph. * WHERE...Meagher County Valleys, Cascade County below 5000ft, Eastern Pondera and Eastern Teton, and Judith Basin County and Judith Gap. * WHEN...From 6 PM this evening to 6 AM MDT Monday. * IMPACTS...Travel could be very difficult. Gusty winds combined with the wet and heavy nature of the snow could bring down tree branches. Isolated power outages are possible.

* WHAT...Heavy, wet snow expected. Total snow accumulations between 6 and 14 inches. Winds gusting as high as 40 mph. * WHERE...Big Belt, Bridger and Castle Mountains. * WHEN...From 6 PM this evening to 6 AM MDT Monday. * IMPACTS...Travel could be very difficult. Gusty winds combined with the wet and heavy nature of the snow could bring down tree branches. Isolated power outages are possible. * ADDITIONAL DETAILS...Snowfall amounts will vary drastically from grassy surfaces to roadways, most notably at lower elevations, with