Dr Weiss observes that the development of irrigation coincides with a second cool, dry period, some 8, 200 years ago.

ECONOMIST: Climate change and civilisation

Latent heat flux is highly variable with low values during the accumulation season and high values during the dry period.

UNESCO: Dublin Core

The summer months tend to be a dry period for the central U.S., limiting the chances for rain to replenish parched soil.

WSJ: Midwest's Dry Spell Threatens to Intensify

"Going into that dry period already dry is not looking good, " said Jim Keeney, weather program manager for the National Weather Service in Kansas City.

WSJ: Midwest's Dry Spell Threatens to Intensify

During the dry period, a large part of the energy supplied by radiation is used to sublimate snow or ice and therefore, energy available for melting is low, which leads to low melt rates.

UNESCO: Dublin Core

"The unusually hot and dry conditions coincide with the period of pollination and kernel formation, which sharply reduces estimated yields, " the USDA reported.

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The Rangers had 10 shots in the first six minutes of the third period, but ran dry.

WSJ: Rangers Run Out of Answers

Over a period of years, dry AMD can progress to a gradual deterioration of retinal cells, which can result in severe vision loss or lead to the wet version of AMD.

CNN: New techniques slow progress of age-related vision loss