Powerful Pacific Storm to Continue Impacting Northern California; Heavy Snow in the Appalachians and Portions of the Northeast

A strong atmospheric river will continue to impact northern California with heavy rain and life-threatening flooding through Friday. Unsettled weather is expected across much of the Northeast and Great Lakes over the next few days, including the likelihood of heavy snow in the central Appalachians and higher elevations of northeastern Pennsylvania and southern New York. 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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Powerful Pacific Storm to Continue Impacting Northern California; Heavy Snow in the Appalachians and Portions of the Northeast

Winter Storm Warning Criteria