1.3 CHPS Use at the WFO
You can access an RFC’s CHPS using a remote client session. Use the NX client (offices on AWIPS build 14.1.1 or newer) or a Virtual Network Computing (VNC) connection (builds prior to 14.1.1).
WFOs typically connect to CHPS via an AWIPS workstation, but it is also possible using a Linux machine. You do not need to download software in order to connect using VNC or NX.
You can use CHPS prior to and during flood events to assess impacts of precipitation and snowmelt. CHPS also has applications during low flow or drought. CHPS is always available, even if it after the RFC's hours of operation.
Scenario: Erika is a Service Hydrologist, and the snowpack in her office’s Hydrologic Service Area is starting to melt during the day, but refreeze at night.
A 3 to 5 inch precipitation event is forecast for later this week with temperatures in the lower 40s, so she logs into the servicing RFC’s CHPS to test several different scenarios.
Existing Tool
WFOs have an application in AWIPS, called the Site Specific Hydrologic Predictor (SSHP) to assess the impacts of precipitation on river stage. The application is not as powerful a tool, and is only for a limited number of sites.
Action! Let the RFC know if you notice a difference between what you have for an action or flood stage and the value the RFC uses.