What could cause the hot water pressure in the kitchen and the showers to drop off dramatically?
I have seen hot water pipes clog up where it screws into hot water heater check pressure at hot water drain valve on heater and see if it is alot higher pressure than another faucet in the house.if it is check for clog in pipe.
As the ventricles contract, the pressure inside of them increases dramatically. When this pressure becomes higher then the pressure inside the great vessels, the blood literally "pushes" the semilunar valves open and empties into the lower pressure vessels. When they reach equal pressure, the semilunar valves close from blood trying to flow back into the ventricles.
High pressure areas usually cause clear skies and sunny weather. However, low pressure [systems] cause stormy weather, causing precipitation, which may include anything between showers, thunderstorms, or hurricanes. The temperature simply affects the kind of precipitation. Warm temperatures lead to rain, cold temperatures lead to snow, etc.