Update 3:47 p.m.:
A good news update - it looks like the numbers of those without power have gone down dramatically in the last half hour or so.
Updated 3:18 p.m. with approximate boundaries of outage - map below
A planned power outage, announced Wednesday afternoon by Ameren, has, at our last check just before 3 p.m., affected approximately 4,800 people in the Missouri portion of the St. Louis area.
The outage was necessary, Ameren said in a statement, to make repairs following a cable failure Tuesday night. Those repairs, Ameren said, are being made to "prevent a more widespread and extensive outage."
The planned outage is expected to last up to 12 hours, but initial repairs might help to decrease the duration.
Here are the approximate boundaries of the expected outage area from Ameren:
View Planned Power Outage - 8/10/11 in a larger map
Is your power out? Want to report an outage? Are you elsewhere and want to know if your power at home is on or out?