I received this from Davis Instruments this evening:
Thanks you for your email to Support. Customers with accounts who send data to Weather Underground Personal Weather Station (PWS) from your weatherlink.com account may notice data is missing or not being sent to Weather Underground in a timely fashion. WeatherLink Software users who have installed Weather Underground’s plugin are also affected. We’ve been in contact with technical staff at The Weather Channel, who operates Weather Underground, and they’ve informed us their RapidFire servers are experiencing a temporary performance problem that should be resolved in the next couple days. When services are available again, we’ll make an attempt to back-fill missing data, but some data points may be lost. Operations staff at Davis Instruments are doing everything possible to make sure the most complete set of data is sent to Weather Underground as soon as possible.
We’ve made available a status page operated by Pingdom, a third party external monitoring service, that measures availability for Weather Underground’s RapidFire service.
http://stats.pingdom.com/zw9vxjhrr9ze/1850219