Validate via correlation with air port data

[cemachelen]

Sara has found some met data
https://rp5.ru/Weather_archive_in_Managua_(airport),_METAR
to compare with the NAM and ECMWF data

• for 2017 NAM data is looking odd in the 3 hours
• ECMWF and NAM look fine in the 6 hours
• humidity in the ECMWF is well too low (as already noticed)
• wind vel underestimated
• Temp ok

1. Test 2017 NAM data against more recent data
2. Compare ECMWF data with NAM current

• if there's no 3 hour issue then the archive data received might be odd?

3. Prepare extraction for comparison over longer time range