Thanks for accepting my plea for help.
I've looked at your station on WU https://www.wunderground.com/personal-weather-station/dashboard?ID=KMSGULFP34#history) and it appears that VWS is sending weather data at a 5-minute interval to WU. I don't see anything out of the ordinary relative to spikes, etc at the moment.
Please take a look at the table data on the 4th, as well as the
intervals on the 4th, 5th, and 6th. I see a lot of variation that I don't understand. And (for the 4th) I see things like this:
12:04 PM 71 °F 70.1 °F 97 % SE 1 mph 1 mph 29.89 in 0 in 1.36 in
12:12 PM 0 °F 0 °F 0 % North 0 mph 0 mph 29.87 in 0 in 0 in
12:15 PM 71.2 °F 70 °F 96 % SSW 0 mph 1 mph 29.87 in 0 in 0 in
12:18 PM 71.6 °F 70.4 °F 96 % South 0 mph 1 mph 29.87 in 0 in 0 in
12:21 PM 72 °F 70.8 °F 96 % South 0 mph 1 mph 29.87 in 0 in 0 in
12:24 PM 70.9 °F 69.7 °F 96 % SSE 1 mph 2 mph 29.89 in 0 in 1.36 in
12:27 PM 72.5 °F 71 °F 95 % West 0 mph 1 mph 29.87 in 0 in 0 in
12:30 PM 72.7 °F 71.2 °F 95 % West 0 mph 1 mph 29.87 in 0 in 0 in
12:33 PM 72.9 °F 71.4 °F 95 % West 0 mph 0 mph 29.87 in 0 in 0 in
12:36 PM 73.1 °F 71.3 °F 94 % West 0 mph 1 mph 29.86 in 0 in 0 in
12:39 PM 0 °F 0 °F 0 % North 0 mph 0 mph 29.87 in 0 in 0 in
12:42 PM 73.3 °F 71.5 °F 94 % SW 0 mph 1 mph 29.86 in 0 in 0 in
12:45 PM 73.4 °F 71.6 °F 94 % SW 0 mph 1 mph 29.86 in 0 in 0 in