[akyoan]

I'm not sure if SMS and email are ever considered urgent enough for this purpose. The alert is sent out seconds before, it's either a loud and unusual sound or you might get to read/answer after it actually hits.

i.e. it'd be useless.

[nostrademons]

SLAs for SMS are also about 98%. 1 in 50 messages isn't going to get to its intended recipient in any reasonable timeframe, which is pretty bad for a time-sensitive public safety feature.