Atlas 2AS Launch tonight from Cape Canaveral AFS

At 5:14pm EDT (2114z) Range Control announced on 157.1 that the Atlas 2AS
will launch in about 40 minutes. The window is from 5:52pm to 8:46pm though.
At 5:24pm, Cape Control announded a launch time of 2222z. But is it common
for "holds" to delay the count.
You can get some of the freqs I'm listening to on my website shown below.

AL STERN Satellite Beach FL (28-11N 80-36W) monitoring
 Patrick AFB (KCOF)  NASA-KSC Shuttle Landing Fac (KX68)
 Avon Park Bombing Range (KAGR)  Cape Canaveral AFS (KXMR)
 JSTARS E-8 Acft Integration Facility, Melbourne IAP (KMLB)
 Worldwide Military HF Communications
 Life Member: Missile, Space and Range Pioneers.
 http://hometown.aol.com/allanstern/m...age/index.html (My Freqs)
 http://hometown.aol.com/scanaddict/index.html (My Equipment)