Document GFS input data

[fossell]

Describe the Enhancement

Add more documentation to the UG (and website?) to clarify input data, what's available, etc. Consider adding limits to UI for date selection?

Time Estimate

3 hours

Sub-Issues

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Relevant Deadlines

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Enhancement Checklist

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• [ ] Fork this repository or create a branch of develop. Branch name: feature_<Issue Number>/<Description>
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[fossell]

GFS input data

• Resolution: 0.25 deg
• Hourly: 0-120
• 3-hourly: 120-384

Two sources:

1. AWS NOAA S3 bucket: latest 10 days of data
2. NOMADS server: latest about 2 years of data