WeatherIf is a weather app that doesn't require you to open an app to check the weather. Instead, it streamlines your weather forecasting operations by sending you notifications.
After installing WeatherIf, you will need to launch the app to set up your notifications and then won't need to touch the app after that. There are five notifications based on different weather conditions -- rainy, cloudy, windy, snowy and clear -- and a sixth that provides the daily forecast. The notifications arrive at your designated wake-up time. The five weather-related notifications alert you to conditions for the following day, while the Daily forecast gives you information about the current day.
I don't know why you would need to be notified that there will be clear skies tomorrow, unless you live in San Diego or a similar clime and want to be reminded daily of your paradise-like weather conditions. I would also argue that the cloudy or windy notifications are of dubious value. I have signed up for the rainy and snowy notifications, particularly as winter approaches in New England.
The app also includes a widget that displays weather information in the Notification Center. To add it, swipe down from the top edge of your iPhone screen to open Notification Center. Next, tap the Today button at the top (as opposed to Notifications).
Next, click the Edit button at the bottom of the Today view and then click the green "+" button to add WeatherIf from the list of widgets. I like the WeatherIf widget better than the stock Today Summary widget because displays more weather information including the current temperature, humidity level and wind speed.
While I like the idea of WeatherIf and will give its rain and snow notifications a trial for the next month or two, it's unlikely to unseat Storm as my go-to weather app. I love Storm's radar and its notifications that alert me when precipitation is detected within 15 miles of my location.