It looks like Apple's Siri voice-recognition servers have gone down — we've gotten several tips about it, and none of the iPhone 4Ss in the office can currently connect. We don't know what's causing the outage or when things might be restored, but we'll let you know. In the meantime, you might try asking a human if you'll need an umbrella today.
Update: We're being told Siri is just fine in the UK, so the outage might be US only. Let us know how it's going for you, wherever you are.
Update 2: And things seem to have returned to normal — we're back to talking only to our phones and never to greedy, unreliable humans.