Are you sure you don't mean the EIA - which is the US fudged, I mean, independent energy info administration stats on crude light inventories?
IEA is international (brent crude) and I believe they meet bi annually with respect to oil supply releases and this can royally (love the queen) move the numbers - whether it be outrights, spreads, cal spreads.
The US weekly figs were inconsequential with respect to cal spreads I traded, but there was some movement on the outrights also.
The weekly figs are available realtime (almost) on the plethora of info sites/sources eg ransquawk et al, otherwise check the EIA website.