MetStats Viewer (Beta) is now Available

This page is under construction

It's been odd weather here in the UK this year (and very wet) so what better way to enjoy the great indoors than by coding up some new weather viewing goodness? It's been promised for awhile, and we've finally got together a beta release of the viewer software for you to try.

The new viewer allows you to view daily, monthly and yearly stats from your weather station. For example here's a screen grab of a very wet July day here in Cambridge.

Features included in the new software include

• Dewpoint and Apparent Temperature plots
• Average wind direction and force
• Heating and cooling degree days
• Change units from metric to imperial
• Print and Print Preview

You can print to XPS files for a PDF like record using the Microsoft XPS Document Writer, which can easily be mailed or archived. Below are sample printouts.

Omissions

Remember, this is beta software, and we want your feedback. In order to get this out to you quickly, we've probably let a few bugs slip through, and not had time to implement some features. The missing features we know about are listed below.

• The total rainfall does not work in single day view
• There is no Wind Average speed shown.
• It's a bit tricky to set the units by right clicking the checkboxes sometimes.
• The temperatures for degree day thresholds are hard coded.
• The colors of the traces are hard coded
• The data is reported from 9 AM to 9 AM the following day

Algorithms

The algorithm for wind may not do what you think. If the wind blows from the south for 11 hours at 24 mph, and then switches to the north for 13 hours at 24 mph, the value shown will be northerly at 2 mph. This represents the average air movement over the day. We're looking at adding another trace that shows the intensity irrespective of direction for those of you looking to monitor a wind turbine.

Dewpoint Calculation

Our routines are derived from humidity information here . The formula we use is:
H = (log10(RH)-2.0)/0.4343+(17.62*t)/(243.12+t);
td = 243.12*H/(17.62-H);

Apparent Temperature Calculation

Our routines are based on information here. The formula we is is:
; e = Vapour Pressure (hPA)
e = rh / 100 x 6.105 x exp ( 17.27 x Ta / ( 237.7 + Ta ) )
; AT = apparent temperature
; ws = wind speed (m/s)
AT = Ta + 0.33 x e - 0.70 x ws ? 4.00