Minor changes to Forecast styling, especially on mobile.

I tweaked a few things:

1) I bumped up the icon a few pixels, as it wasn't aligned properly with the current temperature.
2) I improved the styling on mobile. The temperature bars were too fat and close together, and the current temperature / icon alignment was a little bit off.
3) I'm excluding a few classes of NOAA weather alerts. The Forecast API tends to go a little overboard with the messages it'll deliver, so I excluded some minor non-emergency weather statements to prevent clutter.