The weather

I incessantly check the weather everyday to determine how many layers to wear to school. This is the first time I saw this on my favourite weather website though.

Severe Weather Alert» Read More
Current conditions as of 6:23 pm CDT
Unknown
Feels Like: -6°
Barometer:--
Humidity: 100%
Visibility: 4.02 km
Dewpoint:1°
Wind: NNE 42 kph
Sunrise:6:58 am
Sunset: 5:16 pm

How can the weather station not know what the current conditions are like at the moment?

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FYI: It's been raining for quite a few hours already and there is a thunderstorm. But, I so prefer the rain to the snow as it washes all the snow away.