Develop pipeline for processing ARC2 data

[hannahker]

For monitoring the observational dry spell trigger in Malawi during Jan/Feb 2022, we need to put in place a pipeline that roughly:

• Pulls the latest ARC2 data
• Calculates the daily mean precipitation by admin 2 regions
• Determines if the cumulative mean precipitation value from the last 14 days is <=2mm
• Sends an alert in case the above condition is met and we can say that a dry spell has occurred

We should probably make the timing of this a bit more sophisticated so that we don't have to monitor every day. So for example, maybe daily monitoring is only activated when the previous 7-10 days have <=2mm cumulative rain.

This notebook contains code to do much of this already that could be refactored.

[hannahker]

Thinking along these lines for the overall procedure: