But if you develop persistent muscle weakness, or muscle weakness with no apparent cause or normal explanation, it may be a sign of an underlying health problem. Voluntary muscle contractions are usually generated when your brain sends a signal through your spinal cord and nerves to a muscle.
Of these factors, only rising sea surface temperatures was found to influence hurricane intensity in a statistically significant way over a long-term basis. The other factors affected hurricane activity on short time scales only. rise in the world's sea surface temperatures was the primary contributor to the formation of stronger hurricanes since 1970, a new study reports.
Some scientists believe that prior temperature anomalies have already begun to alter and slow the Gulf Stream and the balance of the currents circulating through the Atlantic over the past 100 years or so. The temperature of surface ocean water can vastly affect the temperature of nearby land areas. In a short-term example, people along the New England coast notice the routine chilling effect the cold Labrador Current and a sea breeze have on their weather during a number of days in the spring.