Winter Storm Warning Criteria

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