The featured chart shows the evolution of aridity since mid April evaluated on a weekly basis for a trailing 14 day period. The weekly values are connected in time to show the trajectory of the change in aridity. This type of chart has a nice property of tending to make circles as temperature and precipitation departures tend to influence each other. The chart shows an interesting transition from 1 Jul to 8 Jul, where we went from above positive precipitation to negative and have not make it back. In fact, it it kind of interesting to see how we've gone from a cold and dry to a hot and dry situation with the precipitation departure holding close to negative one sigma. The line is nearly horizontal going from 19 August to 2 September. The forecast does not hold much hope for positive precipitation departures with more hot weather on the way next week.

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Tags:   aridity