National Weather Service Advanced Hydrologic Prediction Service Klamath River conditions at Klamath, CA. - Advanced Hydrologic Prediction Services (AHPS) are a new and essential component of our Climate, Water, and Weather Services. AHPS is a web-based suite of accurate and information-rich forecast products. They display the magnitude and uncertainty of occurrence of floods or droughts, from hours to days and months, in advance ...

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