Excessive rainfall is expected across Northern California through Tuesday as an area of low pressure moves through the region. Snow will continue from the western US into the Northern Rockies through Wednesday. Elevated winds and seas will continue across the Gulf of Mexico through Monday as a cold front moves eastward. Dense fog will continue along the Texas and Louisiana coasts through Friday morning. 

• Excessive Rainfall through Tuesday across Northern California
• Snow from the West Coast into the Rockies through Wednesday
• Elevated Winds and Seas Monday across the Gulf of Mexico
• Fog along the Texas and Louisiana Coasts Monday Evening through Friday Morning
• Thunderstorms Tuesday for the Gulf Coast
• Snow from the Northern Plains into the Northeast Tuesday and Wednesday

US Hazards

Periods of heavy rain and showers will continue to impact portions of northern California today and Tuesday as a slow-moving storm system tracks through the western US. Model guidance indicates that additional rainfall amounts in this region could range from 3-6 inches, with locally higher amounts in excess of 8 inches. This additional rain combined with prior rain from Sunday will lead to a continued risk of flooding and rock/mudslides. Rainfall will likely continue on Wednesday but should also begin to taper off by midweek.

Major Cities in Region: San Francisco, CA, Sacramento, CA

Rainfall Accumulation through Tuesday

Snow from the West Coast into the Rockies through Wednesday
A large and rather slow progressing upper-level storm system is likely to bring continued snowfall to portions of the western US eastward into the northern Rockies through at least midweek. Heavy snowfall accumulations in excess of 1 foot can be expected over the southern Cascades, Sierra Nevada range, and northern Rockies. Light amounts can be expected for low elevations and valleys, though some travel difficulties will be possible. Gusty winds over the higher terrain may also lead to areas of blowing and drifting snow.

Major Cities in Region: Bend, OR. South Lake Tahoe, CA, Idaho Falls, ID

Snow Accumulation through Wednesday

Elevated Winds and Seas Monday across the Gulf of Mexico
Elevated winds and seas are expected through Monday as a cold front moves eastward. Winds will be northerly to northeasterly at 20-25 knots with gusts in excess of 30 knots. Seas will range 6-9 feet.

Winds and Wave Heights 6pm CST Monday

Fog along the Texas and Louisiana Coasts Monday Evening through Friday Morning
Fog is expected along the Texas and Louisiana coasts through Friday morning as a result of light winds and abundant moisture. Visibilities will be below a mile at times.

WeatherOps Marine Fog Advisory

Thunderstorms Tuesday for the Gulf Coast
As a warm front intensifies over the Gulf of Mexico and lifts northward, elevated thunderstorms are forecast to develop along and north of the front on Tuesday. There will be a risk for strong to potentially a few severe thunderstorms throughout the region, primarily from southeast Texas to the Mobile Bay area. Hail will be the primary hazard with any strong to severe storm that develops.

Major Cities in Region: Houston, TX, New Orleans, LA, Mobile, AL

SPC Convective Outlook for Tuesday

An upper-level disturbance swinging southward out of Canada and then eastward across the northern US will bring a risk of moderate to potentially heavy snowfall to the Northern Plains on Tuesday and spreading into portions of the Northeast on Wednesday. Accumulations in excess of 4 inches are expected.

Major Cities in Region: Grand Forks, ND, Minneapolis, MN, Green Bay, WI, Milwaukee, WI, Grand Rapids, MI, Buffalo, NY, Albany, NY, Boston, MA

Snowfall Accumulation for Tuesday and Wednesday

A Look Ahead
Light snow may develop across the Northern Plains and Upper Midwest on Thursday as an area of low pressure moves across the region. This will continue into Friday; some freezing rain may develop over portions of Missouri and Illinois. Snow will move into the Great Lakes and Northeast on Saturday as the area of low pressure moves eastward. Light snow may develop across the Central Plains on Sunday.