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| a tropical cyclone of less than hurricane force |
| an announcement to the public that a storm or other weather hazard is imminent and that immediate steps should be taken to protect lives and property |
| pressure gradient | |
| —n | |
| 1. | adverse pressure gradient See favourable pressure gradient the change of pressure per unit distance |
| 2. | meteorol the decrease in atmospheric pressure per unit of horizontal distance, shown on a synoptic chart by the spacing of the isobars |