Low Pressure System Traditional Cache
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This tiny cache was hidden on a rainy day before our Springtime in Coloma event. Please return the cache and the natural camouflage to its original position.
The rain today was due to a low pressure system sitting off the California coast for the last couple of days. Low pressure systems are characterized by the counter-clockwise convergence of air on the ground, instability, the rising of air, and divergence aloft. The divergence of air aloft is what allows the system to persist for several days.
At our latitude and longitude, low pressure systems, created by maritime polar air pushed by Easterly winds in contact with maritime tropical air pushed by Westerly winds, generally include the development of a warm front in the east with a cold front further west. This is referred to a mid-latitude cyclone. Weather associated with a warm front typically starts with high, wispy cirrus clouds becoming increasingly thick and continually lowering. Eventually, as the barometric pressure decreases, the clouds become dark, ominous nimbostratus and cover the entire sky. The winds pick up and shift from the east to the south east. Precipitation may begin to fall, remain steady and last for 12 to 24 hours. As the warm front moves beyond our location the skies will gradually clear, possibly being decorated by fluffy, fair-weather cumulus clouds. When that happens, we are enveloped by warm, moist air and experiencing nice weather until the cold front approaches. As that happens, a wall of cumulonimbus clouds (a.k.a. thunderheads or anvil clouds) looms in the west. It approaches very quickly and may bring with it severe weather, including heavy rain, gusty winds out of the south west, possibly thunder and lightening, hail, funnel clouds or even tornados! Fortunately, the cold front, associated with the severe weather, is fast moving and doesn't hang around as long as the warm front. The pressure begins to rise, skies will clear and we will happily encounter fair weather until the next low pressure system heads our way.
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(Decrypt)
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