Update 4:58 a.m.: SpaceX's launch webcast is now posted above, directly below our countdown clock. Liftoff is scheduled in four minutes from Cape Canaveral Space Force Station. SpaceX launch weather looks pristine Update 4:52 a.m.: The temperature at Cape Canaveral Space Force Station was 52 with fair skies, a northwest breeze of 3 mph, and 10-mile visibility just before 4 a.m., the National Weather Service reported. SpaceX booster to land on drone ship Update 4:42 a.m.: This morning's mission marks the Falcon 9 first-stage booster’s 13th flight, SpaceX reported. The booster previously launched Euclid, Axiom-2, Axiom-3, Cygnus NG-21, SES 24, CRS-30 and six Starlink missions. Following stage separation, crews expect the booster to land on the SpaceX drone ship Just Read the Instructions in the Atlantic Ocean. SpaceX Falcon 9 fueling underway Update 4:32 a.m.: Falcon 9 fueling procedures are now underway at Launch Complex 40, billowing water vapor indicates. That means this morning's Starlink mission countdown is now locked in to lift off at 5:02 a.m. without any delays, or else the launch must be postponed. Radar shows picture-perfect launch weather Update 4:16 a.m.: The Florida peninsula is clear of significant cloud cover, as seen in this National Weather Service radar loop from the Melbourne Orlando International Airport station. SpaceX pushes back target launch time Update 4:04 a.m.: SpaceX just announced crews are now targeting 5:02 a.m. for liftoff, a 27-minute delay. SpaceX launch prep underway in Brevard Update 3:45 a.m.: Brevard County Emergency Management officials have activated the agency's launch operations support team ahead of SpaceX’s upcoming Falcon 9 launch. SpaceX: 50%+ of Falcon launches occurred in past 2 years Update 3:30 a.m.: In a Friday tweet, SpaceX President of Launch Kiko Dontchev noted how times have changed since the company's first-ever Falcon 9 launch in June 2010 from Cape Canaveral Air Force Station. "Over 50% of all Falcon launches have occurred in the past two years despite first flight happening 14 years ago," Dontchev said in the tweet. Dontchev noted the recent infrequency in which SpaceX uses a new rocket or even a low-flight booster, say with two to five previous flights. Today's first-stage booster is making its 13th flight. "Starlink has done more than bringing internet to anywhere on Earth. It’s truly driven a step function towards aircraft like operations with rockets," Dontchev said in the tweet. SpaceX Falcon 9 launch countdown Update 3:15 a.m.: Here's a rundown of SpaceX’s upcoming behind-the-scenes Falcon 9 countdown timeline. T-minus: 38 minutes: SpaceX launch director verifies “go” for propellant load. 35 minutes: Rocket-grade kerosene and first-stage liquid oxygen loading begins. 16 minutes: Second-stage liquid oxygen loading begins. 7 minutes: Falcon 9 begins engine chill prior to launch. 1 minute: Command flight computer begins final prelaunch checks; propellant tank pressurization to flight pressure begins. 45 seconds: SpaceX launch director verifies “go” for launch. 3 seconds: Engine controller commands engine ignition sequence to start. 0 seconds: Liftoff.