Ah, springtime in Washington, DC. Where unpredictable weather comes to sow its wild oats.

It's been a distressingly long time since the days my mother was around to remind me to 'bring a jacket', but it got me thinking: The judgments that I make on whether to don a blazer in the morning are based on fairly quantifiable data. I know at what temperature I like to wear a jacket, I know what the temperature for the day is supposed to be, and I know not to wear suede if there's a chance of thunderstorms.

It seems likely that in the age of ultra-accessible information (of which weather seems most ubiquitous), I could build something to do this decision-making for me. Inspired by the geekery at this year's SxSW, I started envisioning a service that would send my phone a text message each day—advising me on whether I should wear jeans or shorts, a jacket or a t-shirt, or bring an umbrella.

WeatherMama had been conceived, and its 2 month gestation is finally almost over.

Read on past the jump for all the geeky details.