Ecological Land Classification of Mount Revelstoke and Glacie r ...

Table 3. Mean annual precipitation (MAP) for stations in and near MRNP and GNP .Station Elevation MAP `b Oct-Mar `b as snowICH1=1278 minRevelstoke A 443 m 947 2 65 37Revelstoke 456 m 1096' 65 361064 2 65 39Albert Canyon 640 m 1014' 64 ndGlacier Avalanche RS 1177 m 1725 2 67 6 4Glacier 1248 m 1493' 66 65Rogers Pass 1323 m 1606 2 70 6 8MontaneGolden 787 m 473' 57 44477' 56 44YNP Boulder Ck . 1219 m 557 2 47 4 5Banff 1397 m 477' 40 4 3471 2 40 44ESSF R=1995 mmMount Fidelity 1875 m 21692 69 7 81914 m 1821' 65 nd'Atmospheric Environment (1975b) : 1941-70, 5-30 yrs . data .'Atmospheric Environment (n .d.a & n.d .b) : 1951-80, 5-30 yrs . data .'Atmospheric Environment (n.d .c) : 1-7 yrs . data .35 to 70% of total precipitation and the proportion increases with increasing elevation (Table 3) . TheInterior Cedar-Hemlock is rarely snow-free in winter . Snow course data from MRNP and GNP forFebruary, March and April show no zero readings over a 40 to 44 year period (Inventory and EngineeringBranch 1980) .The only wind records available for the MRNP and GNP area from Revelstoke and Revelstoke Air -port (Atmospheric Environment 1982) suggest that winds are generally light in valleys . Mean win dspeeds are fairly uniform over the year (3 .5-6 .0 km/hr) with the highest speeds occurring in summer .Prevailing wind direction at Revelstoke is SE from October to February and NW from March to September.Frequencies are also high for westerly and easterly winds . At Revelstoke A, prevailing winddirection is NE in all months except February (SE) . Frequency is also high for SE, S and NW windsin most months . These differences show that surface wind direction is highly variable and determine dby the mountain topography . Calm periods are few in summer but common in winter (13% and 22 %frequency for the two stations in January, Atmospheric Environment 1982) .ENGELMANN SPRUCE-SUBALPINE FIR ECOREGIO NThe Engelmann Spruce-Subalpine Fir Ecoregion occurs at elevations above the Interior Cedar-Hemlockand is moister and cooler . Mean annual temperature is probably