Storm Summary Number 4 for West Coast Atmospheric River
NWS Weather Prediction Center College Park MD
700 PM PST Mon Feb 03 2025

...Heavy rain and mountain snow focusing over north-central
California as an atmospheric river continues...

Winter Storm Warnings are in effect across the Cascades, Sierra
Nevada, southern Oregon, and the northern Rockies.

Winter Weather Advisories are in effect across northern California.

Flood Watches are in effect over portions of north-central
California.

For a detailed graphical depiction of the latest watches, warnings
and advisories, please see www.weather.gov

At 600 PM PST...Regional radar and surface observations depict
continued widespread moderate to heavy rain and mountain snow
associated with an atmospheric river streaming inland across
northern California and into the northern Rockies, focused along
and north of a stationary frontal boundary with embedded areas of
low pressure. 

...Selected preliminary Storm Total Snowfall in inches from 600 AM
PST Fri Jan 31 through 600 PM PST Mon Feb 03...

...CALIFORNIA...
DAVIS CREEK                          18.0                    
HEAVENLY SKI BASE                     7.0                    

...IDAHO...
HAILEY                               28.0                    
GALENA                               27.0                    
BELLEVUE                             22.0                    
CRATERS OF MOON                      16.0                    
ELBA 6 NNW                           14.0                    

...MONTANA...
COOKE CITY                           32.0                    

...OREGON...
ALTAMONT                              9.0                    
ASHLAND                               8.0                    
MEDFORD                               6.0                    
KLAMATH FALLS                         4.5                    

...WASHINGTON...
NASELLE                               3.5                    

...Selected preliminary Storm Total Rainfall in inches from 600 AM
PST Fri Jan 31 through 600 PM PST Mon Feb 03...

...CALIFORNIA...
HILLCREST 1.3 E                     12.92                    
BRUSH CREEK RANGER STATION          12.81                    
STORRIE                             10.92                    
FOUR TREES                           9.88                    
ANGELO COAST RANGE RESERVE           9.80                    
REDDING 7.9 NNE                      9.80                    
RUTH                                 9.04                    
BLUE CANYON                          7.22                    
VENADO                               6.56                    

...OREGON...
O'BRIEN                              3.10                    
BROOKINGS                            2.67                    

...Selected preliminary Peak Wind gusts in miles per hour earlier
in the event...

...CALIFORNIA...
MAMMOTH MOUNTAIN 1.7 S                139                    

...NEVADA...
HAWTHORNE 6.1 NW                      110                    


Moderate to heavy rain and mountain snowfall will continue through
Wednesday as an atmospheric river and low pressure waves along a
frontal boundary slowly sags southward in northern California,
leading to additional precipitation amounts of 2-4" and 7-10" atop
the California Coastal Range and northern Sierra Nevada,
respectively. Scattered flooding, mudslides, and debris flows
remain possible through Wednesday morning across north-central
California. Additionally, there will be some winter weather
impacts in the Sierra Nevada, southern Oregon, and the northern
Rockies as another low pressure wave and plume of moisture move
along the frontal boundary Tuesday. Some snow in the northern
Rockies and Cascades across the Pacific Northwest could be locally
heavy and make for difficult traveling conditions into middle
week. 

The next Storm Summary will be issued by the Weather Prediction
Center at 700 AM PST. Please refer to your local National Weather
Service office for additional information on this event.

Wilder