Two Pressure Patterns
for Upslope Storms
qUpslope storms occur when relatively moist, easterly winds blow westward across the plains and up the east slope of
the Rockies.
qTwo pressure patterns produce easterly winds: (1) a high-pressure system located north of the Colorado and (2) a low-pressure system located south of
Colorado.
qFor the high-pressure system, cold and relatively dry Canadian air produces light
snow
accumulation.
qFor the low-pressure system, warm and moist air from Gulf of Mexico produces snow with higher water equivalent.
qExceptionally blizzards occur when both pressure patterns occur simultaneously.