Symptoms of UVH will depend on the cause of the problem. Symptoms can come. on suddenly or slowly, can be mild or severe, or may last for a few days or even. weeks. The most common symptoms include: ï· Dizziness or vertigo (described as a spinning sensation) ï· Poor balance, especially with head turns.
Positive-tilt Trough. An upper level system which is tilted to the east with increasing latitude (i.e., from southwest to northeast). A positive-tilt trough often is a sign of a weakening weather system, and generally is less likely to result in severe weather than a negative-tilt trough if all other factors are equal.
Positive phototropism in plant stems. 1  Tropism â growth in response to a stimulus. 2  Positive tropism â towards the stimulus. 3  Negative tropism â away from the stimulus. 4  Phototropism â growth in response to the direction of light. 5  Geotropism â growth in response to the direction of gravity.