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The critical role of the diurnal cycle in model simulations is emphasized here. The arrows represent the moisture fluxes estimated from Eta model analyses. The afternoon maximum fluxes into land are followed by large convective precipitation over the western part of Mexico. Satellite estimates of precipitation have been used.

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The critical role of the diurnal cycle in model simulations is emphasized here. The arrows represent the moisture fluxes estimated from Eta model analyses. The afternoon maximum fluxes into land are followed by large convective precipitation over the western part of Mexico. Satellite estimates of precipitation have been used.

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Transient fluxes supply moisture to the southwestern United States. These transients are mostly the result of moisture surges along the Gulf of California, usually due to the passage of easterly waves and tropical storms.

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