TABLE 1-1
| Classification I - defined by > 3 stations receiving > 3.00 inches of liquid precipitation in one day |
| Type 1 (8 cases) - closed upper low off Pacific NW coast |
| Type 2 (6 cases) - closed upper low off BC coast |
| Type 3 (5 cases) - strong low latitude upper jet |
| Type 4 (2 cases) - mid-high latitude blocking from Alaska to the northern Great Basin with undercutting low lattitude jet across the Pacific and into Baja |
| Type 5 (7 cases) - "coastal slider" |
| Classification II - defined by > 3 stations receiving > 6.00 inches of liquid precipitation in two consecutive days |
| Type 1 (5 cases) - closed upper low of Pacific NW coast |
| Type 2 (2 cases) - closed upper low off BC coast |
| Type 3 (2 cases) - strong low latitude upper jet |
| Type 4 (3 cases) - strong low latitude upper jet with significant blocking in the vicinity of Alaska |
| Classification III - defined by > 3 stations receiving > 6.00 inches of liquid precipitation in two consecutive days with the added stipulation that at least one station received >10 inches in two consecutive days |
| Type 1 (1 case) - similar to classification II Type 1but deeper with stronger low latitude upper flow |
| Type 2 (1 case) - deep upper low off BC coast plus secondary low latitude upper trough near 30 N 130 W |
| Type 3 (2 cases) - similar to classification II Type 4 with much lower heights in the low latitudes across the Pacific |
| Type 4 (1 case) - similar to classification II Type 2 with a much deeper upper low, advection of arctic air into the west side of the upper low, and more energy in the low latitudes with an implied tap into subtropical air |