Live updates: Artemis II countdown begins as 80% ‘Go’ weather forecast holds for Florida

With just hours remaining until the historic Artemis II mission, NASA took to the stage on Sunday for a pivotal, pre-launch press conference, and the message was unambiguous: We are ready.

Officials from both agencies expressed unwavering confidence in the ground teams, the Space Launch System (SLS) rocket, the Orion spacecraft, and, most importantly, the four brave astronauts who will soon embark on humanity’s first journey to the vicinity of the Moon in over half a century.

Sunday’s update followed a successful, comprehensive mission readiness review that methodically went through every aspect of the complex mission, from the intricate life support systems to the detailed flight plan.

The one thing we are watching is the weather.

Shawn Quinn, the Exploration Ground Systems Program Manager at Kennedy Space Center, provided a detailed status update on the health of the launch complex.

Quinn confirmed that the mobile launcher and Pad 39B are fully prepared for the immense power of the SLS liftoff. He noted that the ground teams successfully completed final walk-downs and leak checks over the weekend, ensuring that the complex network of fuel lines and electrical connections is ready for the high-stakes "tanking" process scheduled to begin on launch day.

While all systems are "go" right now, the one thing the team is monitoring closely is the weather. Right now, the official launch forecast from the Space Force 45th Weather Squadron shows a 20% chance that weather will scrub the launch.

From left to right, Artemis II Mission Specialist Jeremy Hansen from CSA (Canadian Space Agency), Mission Specialist Christina Koch, Commander Reid Wiseman, and Pilot Victor Glover, arrive on Friday, March 27, 2026, at the Launch and Landing Facility at the agency’s Kennedy Space Center in Florida in preparation for the Artemis II test flight. (NASA/Kim Shiflett)

The Artemis II crew officially arrived at NASA’s Kennedy Space Center in Florida on Friday, March 27, marking their final stop before heading to the Moon.

Touching down at the Launch and Landing Facility, NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, along with CSA astronaut Jeremy Hansen, flew in from Houston aboard T-38 jets.

Upon arrival, the crew shared their excitement with the waiting crowd, with Commander Wiseman exclaiming, "Hey, let's go to the Moon!" and the team revealing "Rise"—a small, round plush mascot that will serve as the mission's zero-gravity indicator.

The four astronauts have since entered their final pre-launch quarantine in the astronaut crew quarters as they prepare for Wednesday’s scheduled liftoff.

The tension is building at Kennedy Space Center as we enter the final hours before the official Artemis II mission clock begins its march toward liftoff.

Today, ground teams will begin the formal 49-hour, 40-minute countdown at 4:44 p.m. ET.

This "countdown to the countdown" involves the final activation of communication systems and the handoff of the Space Launch System rocket to the launch software that will govern every second leading up to Wednesday’s 6:24 p.m. ET launch window.

While the rocket stands ready on Pad 39B, these early hours of the count are focused on powering up the Orion spacecraft and charging the flight batteries that will sustain the crew on their 10-day journey.

This phase is all about precision and poise, ensuring that every internal system is synchronized before the high-stakes propellant loading begins later in the week.

We are officially on the doorstep of history, and the next few hours will set the rhythm for humanity’s first crewed return to the lunar vicinity in over half a century.

The four astronauts of Artemis II represent a historic shift in lunar exploration, marking the first time in over 50 years that humans will journey to the vicinity of the Moon.

Leading the "Artemis Generation" is Mission Commander Reid Wiseman, a veteran of the International Space Station with 165 days in orbit, joined by Pilot Victor Glover, who previously served on NASA’s SpaceX Crew-1 mission.

The Artemis II crew is shown inside the Neil Armstrong Operations and Checkout Building at NASA’s Kennedy Space Center in Florida in front of their Orion crew module on Aug. 8, 2023. From left are: Jeremy Hansen, mission specialist; Victor Glover, pilot; Reid Wiseman, commander; and Christina Hammock Koch, mission specialist. (NASA/Kim Shiflett)

Rounding out the crew are Mission Specialists Christina Hammock Koch, who holds the record for the longest single spaceflight by a woman, and Jeremy Hansen, a colonel in the Canadian Armed Forces making his first trip into space.

This diverse team embodies a "crew for all humanity," featuring the first woman, the first person of color, and the first Canadian to ever embark on a lunar mission.

During their 10-day flight test, the crew will push the limits of the Space Launch System rocket and the Orion spacecraft to ensure that life-support systems are ready for long-term deep space habitation.

This mission is a critical stepping stone in NASA’s "Moon to Mars" approach, validating the technologies and navigation techniques required for humans to live and work in the lunar environment.

By establishing a sustainable presence on the Moon, these four pioneers are paving the way for future scientific discoveries and the eventual goal of sending the first astronauts to the surface of Mars.

As we hit the 48-hour mark until the scheduled liftoff, the intensity at Kennedy Space Center is ramping up for a pivotal moment in the Artemis II mission.

Following a high-level Mission Management Team meeting later today, NASA leadership will hold a news conference at 5 p.m. ET to provide the official word on exactly where the mission stands.

This critical status update serves as a final deep-dive into the technical health of the Space Launch System rocket and the Orion spacecraft to ensure no lingering snags from the weekend's preparations will interfere with the journey.

During this briefing, mission managers and meteorologists will also scrutinize the latest high-resolution data to see if that promising 80% "Go" forecast is still holding firm against those tricky cumulus clouds and upper-level winds.

We expect this meeting to result in a green light for the official 49-hour, 40-minute countdown to begin later this afternoon.

You can catch the update live on FOX Weather at 5 p.m. ET, and we will be right here to break down the technical jargon and explain what it means for your Wednesday evening launch plans.

As NASA prepares to send four astronauts around the Moon for the first time in over 50 years, all eyes aren’t just on the countdown clock—they’re on the clouds.

While the Space Launch System (SLS) is the most powerful rocket in the world, it is still at the mercy of Florida’s fickle weather. NASA’s weather criteria aren’t just suggestions; they are conservative rules designed to keep the crew safe and the hardware intact.

Here is a breakdown of the specific "Go/No-Go" conditions the FOX Weather team is watching as we approach the April 1 launch.

⚡ The "no lightning" zone

Lightning is perhaps the biggest threat at Kennedy Space Center. NASA won't even start the tanking process (filling the rocket with fuel) if there’s a 20% or greater chance of lightning within 5 nautical miles.

• The 30-minute rule: If a bolt of lightning is spotted within 10 nautical miles of the flight path, the clock resets. They must wait 30 minutes after the last flash before they can even think about clearing the tower.
• Anvil clouds: Those flat-topped clouds you see on the horizon are often detached from thunderstorms, but they can still hold a charge. If the flight path comes within 10 nautical miles of an anvil cloud, the mission could be scrubbed.

🌡️ Goldilocks temperatures: Not too hot, not too cold

Rockets are sensitive to the air around them. If it’s too cold, seals can fail (reminiscent of the Challenger disaster); if it’s too hot, internal systems can overheat.

• The floor: NASA won't start fueling if the 24-hour average temperature at the pad is below 41.4°F.

• The ceiling: Liftoff is a no-go if the temperature exceeds 94.5°F for 30 consecutive minutes.

Specific criteria is used to determine whether or not Artemis II will be allowed to launch.

☁️ The "thick cloud" rule

You might look up and see a cloudy day and think, "What’s the big deal?" But for the SLS, clouds are a minefield.

• The 4,500-foot limit: NASA generally won't launch through a cloud layer that is more than 4,500 feet thick if it extends into freezing temperatures.

• Why? Flying a massive metal rocket through thick, freezing clouds can actually trigger a lightning strike, even if there isn't a thunderstorm nearby. It’s called triboelectric charging, and it’s a risk NASA won't take.

EARTH & SPACE

Final preparations underway for the launch of NASA's Artemis II space mission

Launch time is almost upon us as NASA officials begin the final preparations for the launch of Artemis II.

💨 Catching the wind

Wind isn't just a problem at the ground level; it's a problem miles up in the atmosphere.

• At the pad: Peak liftoff winds cannot exceed 29 to 39 knots (about 33–45 mph), depending on how high up the rocket you measure.

• Upper-level winds: Even if it’s calm on the ground, wind shear high in the atmosphere can push the rocket off course or put too much stress on the frame. If the computer models show the rocket might struggle to stay upright, the Launch Director will call a hold.

☀️ Solar storms

Believe it or not, the weather in space matters too. NASA monitors solar activity—huge bursts of energy from the sun. If a solar storm is too intense, it can fry the sensitive electronics on the Orion spacecraft or make it impossible for the astronauts to talk to Mission Control.