See our Facebook page for images of today's countdown and launch!

T-minus 30 minutes and counting. Today's launch is timed for 6:14 p.m. EDT (2214 GMT) at the opening of a 90-minute launch window, but officials are still watching the weather to see if conditions will permit an on-time liftoff.

The first stage liquid oxygen tank is now being topped off to flight level.

SpaceX's webcast is due to begin at 5:55 p.m. EDT (2155 GMT), and you can watch it here.

Liquid oxygen topping continues on the Falcon 9 rocket's first and second stages.

T-minus 40 minutes. The Falcon 9 countdown is in a quiet phase now, with the two-stage rocket filled with kerosene and super-cold liquid oxygen.

Inside one hour until liftoff of SpaceX's Falcon 9 rocket with TurkmenAlem52E/MonacoSat.

Weather conditions at Cape Canaveral are still "no go" for launch, exceeding contraints on anvil clouds and thick clouds over the launch base.

The Falcon 9 rocket has been fueled with kerosene and topping is underway on the liquid oxygen tanks. The cryogenic liquid oxygen tanks on the first and second stages will continue to be slowly replenished until the final minutes before launch to replace propellant that gradually boils off due to the warm ambient temperatures in Florida.

Testing of the Falcon 9 rocket's flight termination system is getting underway at this point in the countdown, as fueling of the two-stage launcher is enters the final stretch.

Weather conditions are currently observed "no go" for launch, and forecasters are watching clouds streaming across Central Florida that could violate a weather rule later in the countdown.

A final weather briefing is planned at the T-minus 1 hour point in the countdown.

It will take about 32 minutes for the Falcon 9 rocket to deliver the TurkmenAlem52E/MonacoSat satellite into geosynchronous transfer orbit. A program manager from Thales Alenia Space, which built the spacecraft, says the launch is targeting a transfer orbit with a high point of about 36,600 kilometers (22,742 miles), a low point of 180 kilometers (111 miles) and an inclination of approximately 25.5 degrees.

After weather briefly went back to a "green" status, the status board now shows conditions are "red" again in violation of the attached anvil rule.

Officials confirm fueling of the 224-foot-tall Falcon 9 rocket is underway at Cape Canaveral's Complex 40 launch pad after the SpaceX launch team issued a "go" to begin propellant loading.

The two-stage rocket burns RP-1 fuel -- a high-refined kerosene -- and liquid oxygen during today's 35-minute launch sequence.

Radio checks between the rocket and the Air Force's Eastern Range are due to begin at 3:29 p.m. EDT (1929 GMT). First motion checks should begin at 3:44 p.m. EDT (1944 GMT).

Testing of the Falcon 9 rocket's destruct mechanisms is scheduled for 4:29 p.m. EDT (2029 GMT), and the launcher's on-board power systems will be activated at 4:44 p.m. EDT (2044 GMT).

As expected, weather will need to be watched throughout this afternoon's countdown. The attached anvil and thick cloud rules are currently being violated.

No problems are reported at this stage in the launch preparations. Fueling of the two-stage rocket with RP-1 fuel -- a highly-refined kerosene -- and liquid oxygen should begin shortly around 3:14 p.m. EDT (1914 GMT).

The rocket is one of the tallest in the world. The Falcon 9's first and second stages measure 12 feet in diameter, and the SpaceX-built payload fairing housing the TurkmenAlem52E/MonacoSat spacecraft is 17 feet in diameter (5.2 meters) and 43 feet tall.

Today's flight marks the 18th launch of a Falcon 9 rocket since debuting in June 2010. It's the 13th mission of the improved Falcon 9 v1.1 version, which made its inaugural launch in September 2013 from Vandenberg Air Force Base.

The weather outlook for today's launch calls for a 60 percent chance of favorable conditions.

The latest weather forecast issued by the U.S. Air Force's 45th Weather Squadron continues to show a 60 percent chance of favorable conditions during this evening's 90-minute launch window, which opens at 6:14 p.m. EDT (2214 GMT).

A weather boundary is producing spotty showers across Central Florida, but the system is sliding slowly south.

A 40 mile band of moisture associated with a boundary has parked itself squarely over the Space Coast this morning," meteorologists wrote in the forecast. "Models indicate this boundary should slowly move south of the spaceport by the end of the launch window. The primary weather concerns are thick cloud layers and cumulus clouds associated with this boundary. Maximum winds are westerly at 100 knots at 40,000 feet."

The forecast calls for isolated showers during the launch window, scattered clouds at 3,000 feet, broken clouds at 14,000 feet and an overcast deck at 25,000 feet. Winds should be out of the northwest at 10 to 15 mph with a temperature of 76 degrees Fahrenheit.

If the launch delays to Tuesday, the forecast worsens with just a 30 percent chance of good weather due to widespread thunderstorms in the area.

SpaceX ground crews transferred a Falcon 9 rocket to its seaside launch mount at Cape Canaveral on Sunday evening in preparation for liftoff Monday with Turkmenistan's first satellite.

The European-built communications satellite fastened inside the Falcon 9's payload shroud will relay signals for Turkmenistan's Ministry of Communications for a 15-year mission.

Liftoff is set for 6:14 p.m. EDT (2214 GMT) Monday from Cape Canaveral's Complex 40 launch pad. The launch window extends for 90 minutes.

Weather forecasters predict a 60 percent chance of favorable weather during Monday's launch window.

Forecasters will be watching clouds and rain showers during the countdown before Monday’s launch of a Falcon 9 rocket carrying Turkmenistan’s first communications satellite.

Read our full story.

Hours after launching a batch of cargo and provisions to the International Space Station on Tuesday, SpaceX ground teams wheeled another Falcon 9 rocket into the hangar at Cape Canaveral for a commercial satellite launch set for April 27.

Read our full story.

Confronted with pesky problems in the Falcon 9 rocket’s helium pressurization system, SpaceX has shuffled the order of the next two launches, choosing to go ahead with the liftoff of a Dragon supply ship on a cargo delivery flight to the International Space Station around April 10.

Read our full story.