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MIKE CURIE/NASA LAUNCH COMMENTATOR: Good afternoon
and welcome to the Orbital ATK CRS-4

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launch campaign.

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Live from Cape Canaveral Air Force Station
in Florida, this is Atlas Launch Control.

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We're at T-minus 29 minutes, 24 seconds and
counting.

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Teams here and across the country are gathered
for launch once again of the Orbital ATK Commercial

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Resupply Services mission 4, or CRS-4, to
the International Space Station.

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After two weather-caused scrubs in succession,
and one postponement on Saturday prior to

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fueling,

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NASA, Orbital ATK and United Launch Alliance
all are hoping that today will be the day.

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Today 45th Weather Squadron Launch Weather
Officer Clay Flinn's forecast calls for a

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70 percent chance

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of favorable weather, a 30 percent chance
of launch weather rule violations.

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Earlier, it was almost reversed, but as we
approached the launch countdown today,

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conditions were more favorable than originally
predicted.

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There still is a possibility of wind gusts
becoming an issue today.

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The forecast is actually calling for lower
gusts from the north, direction of zero-two-zero,

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16 gusting to 20.

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However, in the last hour or so, there have
been a few gusts that have exceeded that.

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We also have in the forecast the slim possibility
for isolated coastal showers.

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Temperature at launch should be around 73
to 74 degrees.

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The concerns would be for ground winds and
cumulus clouds.

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But again,

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weather is definitely looking better today
than it has been the last several days,

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so we are back today at Space Launch Complex
41 here at Cape Canaveral Air Force Station

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for the

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launch of the Orbital ATK Cygnus spacecraft
atop the United Launch Alliance Atlas V rocket.

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Our liftoff today is targeted for the opening
of a 30-minute launch window at 4:44 and 57

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seconds p.m.

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Eastern time.

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A launch today would result in the Cygnus
spacecraft arriving at the station on

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Wednesday, December 9, where crewmembers Kjell
Lindgren and Scott Kelly will use the station's

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Canadarm 2 robotic arm to reach out, grasp
Cygnus at approximately 6:10 a.m.,

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and then will berth it to the Earth-facing
Unity port.