[EBB Sightings] White-throated Swifts

This afternoon between 4:17 and 4:57PM I observed up to 800 + White-throated
Swifts swarming around Flag Hill in Sunol EBRP.
Jeff Miller and I first observed the Swifts  on Tuesday Feb. 2 during the
same time period.
At the time we did not have a scope. I returned today to get a better look.
Today I arrived a few minutes after 4PM, no Swift's were present.
By 4:17 there were 100's, by 4:44 the WTSW were in mass forming a lose
vortex funnel, by 4:57 all the Swift were gone.
It appears the Swifts maybe roosting on the northeast of Flag Hill.
To observe the swifts travel south on Calaveras Rd, Alameda County, park at
road marker 4.82.
Looking northeast you'll see Flag Hill, which is the bare rock butte across
the valley, this is Flag Hill.
Following the ridge line to the west and the south 1000 ft in each direction
and looking high above the hill you will be able to observe the volume of
WTSW.
Rich Cimino
Pleasanton
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