Heavy Rain and Snow to the Southwest U.S. and Alaska; Lake-effect Snow Downwind of the Great Lakes

A storm continues to produce rain and higher-elevation snow over parts of central/southern California through Monday afternoon. This system is also bringing Elevated fire weather conditions over parts of Southwest. Lake-effect snow is expected downwind from the Great Lakes, especially Lake Ontario. A significant winter storm and atmospheric river continue to impact Alaska. Read More >

Criteria for Advisories and Winter Storm Warnings for Snow
Criteria and Timing		Advisory Criteria	Warning Criteria
Valley and Lower Elevation Criteria (3000 feet and below)
	At all times	2"- 3" in 12 hours 3"- 5" in 24 hours	4"+ in 12 hours 6"+ in 24 hours
Mountain Criteria, except Cascades/Blues
.	Early/Late Season (4/1 thru 10/31)	No Advisories	4"+ in 12 hours 6"+ in 24 hours
.	All Other Times	No Advisories	8"+ in 12 hours 12"+ in 24 hours
Cascade Criteria
.	Early/Late Season (4/1 thru 10/31)	2"- 3" in 12 hours 3"- 5" in 24 hours	4"+ in 12 hours 6 "+ in 24 hours
.	All Other Times	5"- 7 " in 12 hours 7 "-11" in 24 hours	8 "+ in 12 hours 12 "+ in 24 hours
Blue Mountains Criteria
.	Early/Late Season (4/1 thru 10/31)	3"- 5" in 12 hours 5"- 7" in 24 hours	6"+ in 12 hours 8"+ in 24 hours
.	All Other Times	5"- 7 " in 12 hours 7 "-11" in 24 hours	8 "+ in 12 hours 12 "+ in 24 hours
Camas Prairie Above 3000 feet
.	Early/Late Season (4/1 thru 10/31)	2"- 3" in 12 hours 3"- 5" in 24 hours	4"+ in 12 hours 6"+ in 24 hours
.	All Other Times	3"- 5" in 12 hours 5"- 7" in 24 hours	6"+ in 12 hours 8"+ in 24 hours

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Heavy Rain and Snow to the Southwest U.S. and Alaska; Lake-effect Snow Downwind of the Great Lakes

Winter Storm Warning Criteria